Co-reporter:Jianzhong Ma, Jianjing Gao, Hongdi Wang, Bin Lyu, and Dangge Gao
ACS Sustainable Chemistry & Engineering November 6, 2017 Volume 5(Issue 11) pp:10693-10693
Publication Date(Web):September 27, 2017
DOI:10.1021/acssuschemeng.7b02662
Compared with surfactants synthesized from petrochemicals, those synthesized from vegetable oil have outstanding environmental friendliness and superior surface activity. Dissymmetric gemini surfactants, a new class of gemini surfactant, have superior properties. Dissymmetry gemini sulfosuccinate surfactant (DGSS) was synthesized from vegetable oil. The structure of the product was confirmed by Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) analyses. The properties tests of DGSS showed that the DGSS can significantly reduce the surface tension and has good emulsification ability, good wetting ability, and poor foaming performance. DGSS was applied as a fatliquoring agent in leather for lubricating collagen fibers and improving physical and mechanical properties of leather. Compared with leather treated with 14 wt % commercial fatliquoring agent, leather treated with 8 wt % DGSS can reach the same fatliquor effect. The biochemical oxygen demand (BOD5) per chemical oxygen demand (COD) of the bath after fatliquoring was beyond 0.3. DGSS has a good fatliquoring effect and was easily biodegradable. DGSS has the advantage of price in the market. DGSS has good features for application in the leather industry as a fatliquoring agent.Keywords: Biodegradation; Collagen fibers; Dissymmetric gemini surfactant; Fatliquoring agent; Lubrication; Vegetable oil;
Co-reporter:Jianhua Zhou, Bianzhi Hao, Linben Wang, Jianzhong Ma, Wenjing Cheng
Separation and Purification Technology 2017 Volume 176() pp:193-199
Publication Date(Web):4 April 2017
DOI:10.1016/j.seppur.2016.11.069
•Nano-TiO2/chitosan/poly(N-isopropylacrylamide) composite hydrogel was prepared by a two-step polymerization method.•Nano-TiO2 was used to give the photocatalytic activity of the composite hydrogel.•The composite hydrogel exhibited high efficiency of acid fuchsin dye removal rate under UV irradiation.Nano-TiO2/chitosan/poly(N-isopropylacrylamide) (nano-TiO2/CS/PNIPAAm) composite hydrogel was prepared by a two-step polymerization method, and nano-TiO2 can endow the composite hydrogel with photocatalytic activity. The nano-TiO2/CS/PNIPAAm composite hydrogel was characterized by FT-IR and SEM. The properties of dye adsorption and photocatalytic degradation were investigated. The results indicated that dye adsorption was strongly influenced by solution pH and the acid fuchsin (AF) removal rate was maximum at pH = 4. The dye removal rate decreased slightly with increasing temperature, and the composite hydrogel adsorbing AF dyes floated on the solution surface at 40 °C and could be readily removed from the aqueous solution. Kinetics analysis indicated that the dye adsorption by nano-TiO2/CS/PNIPAAm composite hydrogel conformed to pseudo-second order model. Moreover, nano-TiO2/CS/PNIPAAm composite hydrogel exhibited high efficiency of photocatalytic degradation for AF dyes, and AF dye removal rate reached 90.5% under UV irradiation for 160 min.
Co-reporter:Yanru Zhao, Jianzhong Ma, Junli Liu, Yan Bao
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2017 Volume 518(Volume 518) pp:
Publication Date(Web):5 April 2017
DOI:10.1016/j.colsurfa.2016.12.050
•A novel fireworks-shaped ZnO/graphite-like carbon core-shell nanowires were synthesized for the first time.•ZnO/graphite-like carbon composites showed a dramatic visible light photocatalytic activity.•ZnO/graphite-like carbon composites showed wide optical absorption, rapid charge separation and good anti-photocorrosion.A novel visible-light-driven ZnO/graphite-like carbon (ZnO/g-C) core-shell nanowires (NWs) were synthesized for promoting the separation of electron-hole pairs, enhancing photocatalytic activity and suppressing the photocorrosion. The fireworks-shaped ZnO NWs were firstly prepared by thermal decomposition of zinc acetate dihydrate and then loaded with carbon layer via a microwave-assisted aqueous solution method. The target products were obtained after ZnO/C nanocomposites were graphited at high temperatures. The results revealed that the photocatalytic activity of the ZnO/g-C NWs was 2.4 times as high as that of pure ZnO under UV–vis light irradiation. And the ZnO/g-C NWs showed a dramatic visible light photocatalytic activity under visible light irradiation. The enhanced photocatalytic activity of ZnO/g-C NWs could be explained by the synergistic effect of the ZnO and graphite-like carbon layer. In the same way, a possible mechanism was discussed in order to explain the enhanced photoactivity under visible light irradiation.Download high-res image (142KB)Download full-size image
Co-reporter:Aiping Hui, Jianzhong Ma, Junli Liu, Yan Bao, Jing Zhang
Journal of Alloys and Compounds 2017 Volume 696(Volume 696) pp:
Publication Date(Web):5 March 2017
DOI:10.1016/j.jallcom.2016.10.319
•A highly efficient catalyst.•Fe doped sea urchin-shaped ZnO nanoparticles with uniform dispersity.•5% Fe doped sea urchin-shaped ZnO has the best photocatalytic activity.Fe doped sea urchin-shaped ZnO nanoparticles (NPs) were fabricated by the combination of precipitation method and calcination process. X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), Brunauer-Emmett-Teller analysis (BET), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDS) were used to analyze the crystalline structure, morphology, specific surface area, element valence state and elements composition of the obtained samples, respectively. Photocatalytic activity of Fe doped sea urchin-shaped ZnO NPs with different [Fe]/[Zn] molar ratios was monitored in terms of degradation rate and total organic carbon (TOC) removal efficiency by rhodamine B (RhB) degradation under UV light irradiation. Their results indicated that with increased levels of doping content, there was a change in crystallite shape. In addition, increasing levels of the iron content up to 5% results in increased absorption in the visible region of the spectrum, a slightly decreased optical band gap (Eg) and increased photocatalytic activity. It is demonstrated that 5% Fe doped ZnO NPs had smaller size, more uniform dispersion, as well as better photocatalytic activity. Besides, TOC measurement results also make the photocatalytic activity more convincing.Download high-res image (188KB)Download full-size image
Co-reporter:Yan Bao, Jiajia Guo, Jianzhong Ma, Pan Liu, ... Jing Zhang
Journal of Industrial and Engineering Chemistry 2017 Volume 53(Volume 53) pp:
Publication Date(Web):25 September 2017
DOI:10.1016/j.jiec.2017.03.045
A series of cationic silicon-based gemini surfactants (Cm-PSi-Cm) having different hydrophobic chains length (m = 8, 10, 12, 14, 16, 18) were synthesized. Subsequently, surface parameters including equilibrium surface tension (γCMC), critical micelle concentration (CMC), surface pressure at CMC (ΠCMC) and maximum surface excess (Γmax) were calculated according to the surface tension measurements. The importance of hydrophobic chains length on the surface activity of Cm-PSi-Cm was revealed in detail. With the increasing hydrophobic chains length, the equilibrium surface tension (γCMC) values follow the order of C8-PSi-C8 > C10-PSi-C10 > C12-PSi-C12 < C14-PSi-C14 < C16-PSi-C16 < C18-PSi-C18. The thermodynamic parameters of micellization process, namely, standard Gibbs free energy (ΔG0m), enthalpy (ΔH0m) and entropy (ΔS0m), were derived from conductivity measurements at different temperatures. The aggregation of the cationic silicon-based gemini surfactants (C12-PSi-C12) in aqueous solution at different concentrations was studied by DLS and TEM measurements. The formation of micelles and vesicles in C12-PSi-C12 solutions was observed at a concentration well above the CMC. Moreover, the morphology of vesicles changed from sphere to rod-like, dumbble-like and finally string dumbbell-like with the increasing of the surfactant concentration.Download high-res image (173KB)Download full-size image
Co-reporter:Liang Shao;Zhanyou Ji;Chaohua Xue;Fuquan Deng
Polymer Bulletin 2017 Volume 74( Issue 2) pp:413-429
Publication Date(Web):2017 February
DOI:10.1007/s00289-016-1721-4
To obtain excellent mechanical properties of polymer nanocomposite foams without sacrificing the lower density through popular and friendly means. Organically modified palygorskite (OPal) was prepared with γ-aminopropyltriethoxysilane on the surface of rod-shaped Pal particles, and nanocomposite foams based on ethylene-vinyl acetate (EVA) copolymer was prepared by melt-blending EVA with OPal. Fourier transform infrared spectroscopy (FTIR) was used to investigate the interaction between OPal and EVA matrix, and the OPal/EVA nanocomposites were also characterized by X-ray photoelectron spectra (XPS), X-ray diffraction analysis (XRD) and differential scanning calorimetry (DSC). The dispersivity of OPal in the EVA matrix and the morphology of the foams were investigated by transmission electron microscopy (TEM) and scanning electron microscopy (SEM), and the OPal/EVA nanocomposite foams were also characterized by thermogravimetric analysis (TGA). The effect of OPal content in the foam samples on the cellular structure and mechanical properties was investigated. Our studies indicate that the OPal nanofibers could be used as a heterogeneous nucleation agent to reduce the average cell diameter. The uniformity of cell structure of the foams was improved, and the physical properties of OPal/EVA nanocomposite foams were enhanced by the addition of OPal. The density of OPal/EVA nanocomposite foams was decreased to 0.133 g/cm3. Also, the best tear strength, peel strength and compression set values of nanocomposite foams were 4.65, 2.65 N/mm and 25.5 %, which were improved by 36.0, 54.3 and 12.0 %, respectively, compared with those of the initial foam.
Co-reporter:Junli Liu, Ruijing Hu, Hui Liu, Jianzhong Ma
Journal of Alloys and Compounds 2017 Volume 718(Volume 718) pp:
Publication Date(Web):25 September 2017
DOI:10.1016/j.jallcom.2017.05.198
•Composites have been successfully synthesized by a simple hydrothermal method.•Cuboid-like Ni(OH)2/rGO was assembled by nickel hydroxide and graphene sheets.•Cuboid-like Ni(OH)2/rGO was prepared in the existence of l-cysteine.•The Ni(OH)2/rGO composite exhibits high specific capacitance.In this paper, nickel hydroxide/rGO (Ni(OH)2/rGO) composite was successfully obtained in the existence of graphene oxide solution via hydrothermal method, with nickel nitrate hexahydrate as the nickel source, urea as the alkali source, and l-cysteine as the template. The structure and morphology of the composite were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), micro confocal laser raman spectroscopy (Raman) and BET surface analyzer. Finally, the electrochemical performance of the product was measured by electrochemical workstation. Morphological and structural analyses indicated that Ni(OH)2/rGO composite had good crystalline and a chips assembled cuboid structure with high specific surface area. Raman results indicated that the obtained composite has obvious D- and G-bands, which confirmed the Ni(OH)2/rGO composite was prepared successfully. Moreover, graphene was partially reduced during the hydrothermal reaction. Serving as the electrode material for supercapacitors, the Ni(OH)2/rGO composite exhibits high specific capacitance (1224 F/g at 2 A/g in the 3 M KOH), a nearly constant rate performance of 62.1% at current density ranging from 2 to 10 A/g, and 72.1% retention capacitance after 1000 continuous cycles. That indicates Ni(OH)2/rGO composite is promising electrode material for the electrochemical energy storage applications.
Co-reporter:Qiaoling Kang, Yan Bao, Miao Li, Jianzhong Ma
Progress in Organic Coatings 2017 Volume 112(Volume 112) pp:
Publication Date(Web):1 November 2017
DOI:10.1016/j.porgcoat.2017.04.045
•The different wall thickness of hollow TiO2 spheres have been effectively controlled by simply varying the dosage of TBT.•The possible formation mechanism of hollow TiO2 spheres was proposed.•The results showed that hollow TiO2 spheres were proven to have extremely enhanced the thermal insulation, UV-shielding, and mechanical property of polyacrylate membrane.Hollow TiO2 spheres were fabricated by calcining the polystyrene-titania composite microspheres prepared via a sol-gel process of titanium tetrabutoxide (TBT) using cationic polystyrene (PS) spheres as template. The wall thickness of hollow TiO2 spheres was finely tuned between 13 nm and 94 nm by varying the amount of titania precursor from 0.43 wt% to 1.25 wt% based on polystyrene latex during the coating process. The thermal insulation, UV-shielding, and mechanical properties of polyacrylate (PA) film were obviously enhanced by introducing hollow TiO2 spheres via physical blending method. Moreover, these properties exhibit a trend of first good and then become worse with the wall thickness of hollow TiO2 spheres increasing. When the wall thickness of hollow TiO2 spheres is 43 nm, the properties of polyacrylate/hollow TiO2 composite film are optimum.
Co-reporter:Yanan Wang, Jianzhong Ma, Qunna Xu, Jing Zhang
Materials & Design 2017 Volume 113(Volume 113) pp:
Publication Date(Web):5 January 2017
DOI:10.1016/j.matdes.2016.09.082
•Antibacterial casein-based composite was designed by introducing ZnO nanoparticles.•The incorporation of ZnO was beneficial for obtaining a compact and continuous hybrid film.•Flexible caprolactam-casein/ZnO film presented flowerlike ZnO aggregation.Flexible hybrid caprolactam-casein/ZnO nanocomposite (CCZ) was prepared by in-situ polymerization method. The micro morphology and structure were characterized using DLS, TEM, SEM and FT-IR. The influence of ZnO dosage on the appearance, hand feeling, mechanical property as well as antibacterial activity of as-prepared composite films was explored separately. TEM measurements revealed that ZnO NPs were trapped in the inner layer by casein micelles. SEM indicated that part of ZnO was deposited on both surface and inside of CCZ film in film-forming process. Moreover, the films displayed expected mechanical properties and excellent antibacterial activities against Staphylococcus aureus and Escherichia coli. This work provided a feasible pathway for fabricating natural polymer-based nanocomposite antibacterial coating which will has great potential use in several fields, such as textile, leather, packaging, paper making and indoor wall coating.Download high-res image (81KB)Download full-size image
Co-reporter:Bin Lyu, Kun Cheng, Jianzhong Ma, Xueyan Hou, Dangge Gao, He Gao, Jing Zhang, Yuliang Qi
Journal of Cleaner Production 2017 Volume 148(Volume 148) pp:
Publication Date(Web):1 April 2017
DOI:10.1016/j.jclepro.2017.01.170
•Compound enzyme can remove grease efficiently in the wetting of greasy wet-blue.•The use of compound enzyme was good for the dispersion of collagen fibers.•The adsorption of dyes was improve after wetting by compound enzyme.•Compound enzyme can alternative surfactant in the wetting of wet-blues.Enzyme is a green, efficient and easily degradable substance. In the present investigation, the papain and 100-c enzyme instead of part of surfactants were used in degreasing process. The results indicated that when wet-blue sheepleather was treated by the enzymatic compound, protein content in the effluent was about 9 times more than that of the non-ionic degreasing agent with less damage to collagen. Moreover, the degreasing rate for enzyme degreasing was 40.1% which was much higher than that of non-ionic degreasing agent. Mechanical properties of the crust leather treated by enzymatic compound were matchable to those treated by non-ionic degreasing agent. Color difference values of the leather indicated that the wet-blue sheepleather was easy to be dyed after being treated by enzymatic compound. The K/S value of the leather treated by enzymatic compound was much higher than that treated by non-ionic degreasing agent. Histological analysis of wet-blues visually showed efficient fat removal by enzymatic compound. Enzymatic compound used in degreasing of greasy wet-blues could improve the leather’ quality.Download high-res image (186KB)Download full-size image
Co-reporter:Xiao-Jing Guo, Chao-Hua Xue, Shun-Tian Jia, Jian-Zhong Ma
Chemical Engineering Journal 2017 Volume 320(Volume 320) pp:
Publication Date(Web):15 July 2017
DOI:10.1016/j.cej.2017.03.058
•Superamphiphobic fabrics were fabricated by synergistic hydrophobization.•The synergistic hydrophobization lowered the amount of fluorinated compound needed.•The as-obtained fabrics have excellent durability of superamphiphobicity.•The superamphiphobic fabrics show brilliant resistance to blood staining.Superhydrophobic poly(ethylene terephthalate) (PET) fabrics were firstly fabricated by one-pot in situ Stöber reaction of tetraethylorthosilicate (TEOS) and dodecyltrimethoxysilane (DTMS), in which the as-formed silica particles roughened the fiber surfaces and the hydrolyzed dodecyltrimethoxysilane hydrophobized the fabrics. Then the superhydrophobic fabrics were turned superamphiphobic after modification with perfluorodecyltrichlorosilane (PFDTS), with water and oil contact angles higher than 150°. The synergistic hydrophobization of DTMS, PFDTS and PDMS made the roughened fabrics easy to be superamphiphobic using very low concentration of PFDTS. Meanwhile, the as-obtained superamphiphobic fabric showed excellent chemical robustness even after exposure to different chemicals, such as acid, base, and salt. Importantly, the fabrics were durable to 100 cycles of laundries, 1000 cycles of mechanical abrasion as well as long time exposure to UV irradiation without apparently changing the amphiphobicity. Also, the surface of the superamphiphobic fabrics showed excellent blood stain resistance properties.Download high-res image (134KB)Download full-size image
Co-reporter:Yan Bao, Caiping Feng, Cheng Wang, Jianzhong Ma
Progress in Organic Coatings 2017 Volume 112(Volume 112) pp:
Publication Date(Web):1 November 2017
DOI:10.1016/j.porgcoat.2017.08.002
•Hollow ZnO microspheres were synthesized by a template-free hydrothermal process.•The formation mechanism of hollow ZnO microspheres had been proved.•Polyacrylate/hollow ZnO composite films have better comprehensive properties.•The reason for hollow ZnO on enhanced behavior of polyacrylate films were showed.In this study, hollow ZnO microspheres were successfully synthesized by a one-step template-free hydrothermal synthetic route straightforwardly just for 30 min at 90 °C. More importantly, hexamethylenetetramine and trisodium citrate played a significant role in the fabrication of hollow ZnO microspheres, and distilled water served as the main solvent without adding any organic solvent and surfactants. The architecture and morphology of as-obtained ZnO microstrutures were estimateded by field-emission scanning electron microscopy (FE-SEM), powder X-ray diffraction (PXRD) and Brunauer-Emmett-Teller (BET). With the morphological evolution apperceived in the time-dependent growth of hollow ZnO microspheres, a possible formation mechanism based on Ostward ripening inside-out was proposed. Then, polyacrylate/hollow ZnO composite latex was obtained by physical blending of hollow ZnO microspheres and polyacrylate emulsion. As expected, hollow ZnO microspheres has a significant impact on water vapor permeability, water resistance and mechanical porperties. Among them, the water vapor permeability and water resistance was relatively increased by 71.18% and 38.42%, respectively.Download high-res image (204KB)Download full-size image
Co-reporter:Dangge Gao, Leihong Lyu, Bin Lyu, Jianzhong Ma, Lintao Yang, Jing Zhang
Materials Research Bulletin 2017 Volume 89(Volume 89) pp:
Publication Date(Web):1 May 2017
DOI:10.1016/j.materresbull.2017.01.030
•Ce doped ZnO nanorods were prepared via simple chemical precipitation method.•The particle size was effected by the Ce content of Ce doped ZnO.•Ce-ZnO endow fabric with UV resistance, hydrophobicity and antibacterial activity.•The performance of loaded fabric was enhanced by the doping, and influenced by doping amount.Ce doped ZnO (Ce-ZnO) nano materials with different Ce molar content were prepared via chemical precipitation method. The morphology of Ce-ZnO was rod like and the size was decreased with the increase of doping amount, and the size of Ce-ZnO was 180 nm in length and 40 nm in diameter when the doping amount is 2.5%. All the samples were treated on cotton fabric, the laden fabric has excellent performance on hydrophobicity, UV resistance and antibacterial activity. The contact angle of fabric loaded with ZnO was 103°, and fabric with 2.5% Ce-ZnO was 148°. The fabric loaded with Ce-ZnO has superior performance of UV resistance. With the increase of doping amount, the antibacterial rates were promoted and then reduced, the antibacterial rates against S. aureus and C. albicans of fabric with 2.5% Ce-ZnO were promoted to 83% and 85%, however, the antibacterial activity against E. coil was reduced to 78%.Ce doped ZnO (Ce-ZnO) nano materials with different Ce molar content (0%, 1.0%, 1.5%, 2.0%, 2.5% and 3.0%) were prepared via simple chemical precipitation method. The morphologies of ZnO and Ce-ZnO were rod like and the size of nanorods was decreased with the increase of doping amount. All the samples were treated on the cotton fabric. Ce-ZnO nano powders can endow the fabric with excellent hydrophobicity, UV resistance and broad spectrum antibacterial activity against Gram positive, negative bacteria and fungus. Fabric treated with Ce-ZnO has a better performance than ZnO in the hydrophobic and UV resistance, and a more effective antibacterial activity against to S. aureus and C. albicans, but a lower activity against to E. coli.Download high-res image (118KB)Download full-size image
Co-reporter:Yan Bao, Jiajia Guo, Jianzhong Ma, Miao Li, Xiaolu Li
Journal of Molecular Liquids 2017 Volume 242(Volume 242) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.molliq.2017.06.049
•Novel surfactants were analyzed for physicochemical and antimicrobial activities.•Novel surfactants have advantages of gemini surfactants and silicone surfactants.•Novel surfactants exhibit outstanding wetting ability and emulsion power.•Novel surfactants show antibacterial activities against bacteria and mould.Physicochemical activities including critical micelle concentration (CMC), wetting ability and emulsion power of cationic gemini surfactants with polyether siloxane linked group and quaternary ammonium hydrophilic headgroup (Cm-PSi-Cm, m = 8, 10, 12, 14, 16, 18) were tested using steady-state fluorescence, contact angle measurements, etc. The CMC values of Cm-PSi-Cm significantly lowered with the increase of the hydrophobic chain length, indicating that aggregation ability of Cm-PSi-Cm with longer hydrophobic chain was strengthened. Wetting ability and emulsion power of Cm-PSi-Cm increased initially and then decreased with the increasing of the hydrophobic chain length m for Cm-PSi-Cm. Moreover, antimicrobial activities of Cm-PSi-Cm on a variety of bacteria including Gram-positive bacterium (Staphylococcus aureus), Gram-negative bacterium (Escherichia coli) and mould (Aspergillus flavus) were tested using the method of inhibition zones and plate count. The results showed that C10-PSi-C10, C12-PSi-C12 and C14-PSi-C14 exhibited outstanding antimicrobial property for varieties of bacteria, implying that Cm-PSi-Cm having too long or too short hydrocarbon chain was not beneficial to inhibit microbe. All these results established the structure–property relationship of the surfactant molecule specifically the dominant role displayed by the hydrophobic chains length.
Co-reporter:Jianhua Zhou, Xin Chen, Jianzhong Ma
Dyes and Pigments 2017 Volume 139(Volume 139) pp:
Publication Date(Web):1 April 2017
DOI:10.1016/j.dyepig.2016.11.035
•Cationic hybrid latex was synthesized via ab initio RAFT emulsion polymerization.•The treated fabrics showed good water repellency.•The treated fabric had good antibacterial property against E. coli and S. aureus.Cationic fluorinated polyacrylate emulsifier-free emulsion was synthesized by ab initio RAFT emulsifier-free emulsion polymerization using fluorine-containing amphiphilic block copolymer poly (2-(dimethylamino) ethyl methacrylate)-b-poly (hexafluorobutyl acrylate) (PDMAEMA-b-PHFBA) macro-RAFT agent as a stabilizer, and (2-(acryloyloxy)ethyl)trimethylammonium chloride (DMC) as a cationic monomer. The critical micelle concentration (CMC) of PDMAEMA-b-PHFBA is much smaller than the CMC of SDS, suggesting the excellent micelle-forming ability of PDMAEMA-b-PHFBA in water. The influence of the amount of DMC on emulsion polymerization and finished fabric properties was investigated. The latex particle size and its distribution decreased as the amount of DMC increased from 0 wt% to 2.25 wt%, and then increased afterwards. The cationic fluorinated polyacrylate showed much higher thermal stability than polyacrylate. The water contact angle of the finished fabric decreased with the increase of the amount of DMC. The cationic fluorinated polyacrylate emulsifier-free emulsion was deposited on the surface of fabric characterized by SEM-EDX, and the finished fabrics showed good water repellency. In addition, the finished fabric with fluorinated polyacrylate emulsifier-free emulsion had good antibacterial property against E. coli and S. aureus.Download high-res image (232KB)Download full-size image
Co-reporter:Yan Bao, Caiping Feng, Cheng Wang, Jianzhong Ma, Chenchen Tian
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2017 Volume 518(Volume 518) pp:
Publication Date(Web):5 April 2017
DOI:10.1016/j.colsurfa.2017.01.033
•Various ZnO microstructures have been effectively controlled by diverse solvents and formation mechanism was proposed.•The illustration of water vapor permeability and water resistance of polyacrylate/ZnO composite film was illuminated.•Polyacrylate/hollow columnar-like ZnO composite films were proven to have extremely high comprehensive activities.A facile method was used to fabricate ZnO microstructures with microrod-like, hollow fusiform-like, and hollow columnar-like morphology in different organic solvent. Then, polyacrylate/ZnO composite emulsions were obtained by physical blending of polyacrylate emulsion and ZnO microstructures. The effect of ZnO with different morphologies on water resistance, water vapor permeability, mechanical property, and UV-shielding performance of polyacrylate film were investigated. The results showed that hollow columnar-like ZnO was more conductive to improve the comprehensive performance of composite films because it possesses larger specific surface area. The pure polyacrylate emusion and polyacrylate/hollow columnar-like ZnO composite emulsion were applied in leather matrix finishing process, and the results demonstrated that leather matrix finished by polyacrylate/hollow columnar-like ZnO composite emulsion shows excellent hygienic and anti-bacterial performance.Download high-res image (229KB)Download full-size image
Co-reporter:Yan Bao, Qiao Ling Kang, Jian Zhong Ma, Chao Liu
Ceramics International 2017 Volume 43, Issue 12(Volume 43, Issue 12) pp:
Publication Date(Web):15 August 2017
DOI:10.1016/j.ceramint.2017.03.155
Hollow TiO2 spheres were easily fabricated through a template-free solvothermal route only using tetrabutyl titanate (TBT) as raw material and absolute ethanol as solvent. The morphology of hollow TiO2 spheres was successfully controlled by adjusting the reaction time and reaction temperature. The formation process of hollow TiO2 spheres includes three steps based on the experimental results: the hydrolysis of TBT to produce Ti(OH)4 clusters in water formed from an ethanol etherification reaction under high temperature and high pressure, the assembly of Ti(OH)4 clusters into solid spheres, and the transformation of solid TiO2 spheres into hollow TiO2 spheres. Furthermore, the as-prepared hollow TiO2 spheres exhibited good thermal insulation performance including heat barrier and heat reflection.
Co-reporter:Xiao-Jing Guo;Chao-Hua Xue;Min Li;Xing Li;Jian-Zhong Ma
RSC Advances (2011-Present) 2017 vol. 7(Issue 41) pp:25560-25565
Publication Date(Web):2017/05/10
DOI:10.1039/C7RA02111A
Multifunctional fabrics with excellent water repellency are very useful for practical applications. In this study, poly(ethylene terephthalate) (PET) fabrics were functionalized by introducing carbon nanotubes (CNTs) onto the PET fibers via a facile layer-by-layer electrostatic assembly using poly(dimethyl diallyl ammonium chloride) as a polyelectrolyte, followed by post-treatment with poly(dimethylsiloxane) (PDMS). The obtained fabric surfaces possessed superhydrophobicity, UV blocking properties and electrical conductivity. The hydrophobicity and electrical conductivities of the PET fabrics were systematically tunable by controlling the number of assembly layers. Wettability tests showed that the superhydrophobicity of the modified fabrics was robust to acid/alkaline etching, UV irradiation, long-time laundering and mechanical abrasion. Moreover, electrical conductivity showed no significant change even after repeating water laundering 20 times.
Co-reporter:Qunna Xu, Qianqian Fan, Jianzhong Ma, Ziqiang Yan
Progress in Organic Coatings 2016 Volume 99() pp:223-229
Publication Date(Web):October 2016
DOI:10.1016/j.porgcoat.2016.05.024
•Casein-based TiO2 nanocomposite was innovatively prepared via single-in-situ soap-free polymerization.•Casein-based TiO2 nanocomposite latex exhibited evident core-shell structure with TiO2 incorporated inside.•The composite coatings showed superior self-cleaning behaviors.•Nano-TiO2 has positive effects on the covering ability of the composite coatings.Casein-based TiO2 nanocomposite was innovatively prepared from casein, polyacrylate and TiO2 powders via single-in-situ soap-free polymerization. Effects of TiO2 dosage on the emulsion stability and film properties were investigated. Chemical structure and microstructure of the composite particles were characterized by fourier-transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM) and scanning electron microscope (SEM). The results showed that the as-prepared composite latex exhibited evident core-shell structure with the majority of TiO2 incorporated inside, of which the average size was approximately 100 nm. Significantly, the composite film showed superior covering ability, impressive self-cleaning properties and good tensile strength, which promise its potential use as high-performance coatings on leather, textile or other substrates thus improve their added values.
Co-reporter:Wenbo Zhang, Jianzhong Ma, Dangge Gao, Yongxiang Zhou, Congmin Li, Jiao Zha, Jing Zhang
Progress in Organic Coatings 2016 Volume 94() pp:9-17
Publication Date(Web):May 2016
DOI:10.1016/j.porgcoat.2016.01.013
•Prepare amino-functionalized graphene oxide(NGO) by Hoffman rearrangement successfully.•NGO had good dispersibility in polyacrylate latex and film above pH 6 by electrostatic force.•NGO improved the mechanical and thermal properties of the polyacrylate/NGO composite at a stable disperse state.Amino-functionalized graphene oxide (NGO) was prepared by Hoffman rearrangement where carboxyl group was replaced directly by amino group instead of using long-chain containing amino group. The chemical structure of NGO was studied by FT-IR, UV–vis, Raman, XPS and TGA. NGO was incorporated into polyacrylate latex (PA) by blending to prepare PA/NGO composite. The dispersibility of NGO in PA latex was significantly influenced by pH values. When the pH value was higher than 6, NGO uniformly dispersed in PA. The mechanical properties of the PA/NGO film were relayed on the pH. The break strength of the film was increased from ∼2 MPa to ∼5 MPa but the elongation at break decreased from 475% to 258% compared with those of PA film. The glass transition temperature (Tg) of PA/NGO film increased by 3.48 °C. For the sake of comparison, the mechanical properties and Tg of a similar composite but with bare graphene oxide (PA/GO) are presented.
Co-reporter:Jianzhong Ma, Xiaolu Li and Yan Bao
RSC Advances 2015 vol. 5(Issue 73) pp:59745-59757
Publication Date(Web):23 Jun 2015
DOI:10.1039/C5RA08522E
This contribution provides a brief overview of recent progress in cellulose-based superabsorbent hydrogels, fabrication approaches, materials and promising applications. First, different synthesis methods are introduced, including physical, as well as chemical cross-linking. Second, some of the cellulose series original materials were introduced in this work. In addition, some applications and future research in cellulose-based superabsorbent hydrogels are also discussed in this review.
Co-reporter:Qunna Xu, Fan Zhang, Jianzhong Ma, Tao Chen, Jianhua Zhou, Demetra Simion, Gaidău Carmen
Progress in Organic Coatings 2015 Volume 88() pp:1-7
Publication Date(Web):November 2015
DOI:10.1016/j.porgcoat.2015.06.011
•A facile way for developing nano-scale casein-based hybrid particles was proposed.•The presence of silane endowed the composite film with superior properties.•The as-prepared nano-composite can be a good candidate for coatings.Silane coupling agents are recognized as efficient coupling agents extensively used in composites and adhesive formulations. In this paper, casein-based silica nano-composite latex for coatings was prepared via double-in situ method stabilized by methyl propyl trimethoxy silane (KH570) – a kind of silane coupling agent. The latex was mainly characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), scanning electron microscopy (SEM), atomic force microscopy (AFM) and thermogravimetry (TGA). Effects of KH570 on the structure and performance of the latex and film, as well as the application performance were discussed systematically. The results showed that the presence of KH570 increased the silica-shell uniformity due to the improvement of the compatibility between the organism and inorganism. Existence of KH570 could endow the hybrid film with enhanced mechanical strength, water resistance and heat resistance. The as-prepared composite may also give finished leather with preferred wet/dry rub resistance, water resistance and tensile strength. Latex particle formation mechanism was proposed accordingly.
Co-reporter:Jianhua Zhou, Xin Chen, Hao Duan, Jianzhong Ma
Progress in Organic Coatings 2015 Volume 89() pp:192-198
Publication Date(Web):December 2015
DOI:10.1016/j.porgcoat.2015.09.016
•Nano-SiO2/fluorinated polyacrylate was synthesized by soap-free emulsion polymerization.•Hybrid film had a rough surface and an excellent hydrophobicity.•Nano-SiO2 can improve the solvent-resistant and mechanical properties of hybrid film.In this research, organic fluorine and nano-SiO2 modified polyacrylate emulsifier-free emulsion was successfully synthesized via emulsifier-free emulsion polymerization with ethyl silicate (TEOS) as precursor for nano-SiO2 and dodecafluoroheptyl methacrylate (DFMA) as fluorinated monomer. The stability of latex prepared in the presence of alkyl vinyl sulfonate was much higher than that of latex prepared in the presence of sodium dodecyl benzene sulfonate. With increasing DFMA content, the latex particle size and hydrophobicity of hybrid film increased. Furthermore, the hybrid film presented highly solvent-resistant and good mechanical properties. In addition, the FT-IR spectrum indicated that the DFMA and nano-SiO2 were successfully introduced into the hybrid polymer. AFM and SEM measurements confirmed that the hybrid film had a rough surface. At last, the formation mechanism of the hybrid film was established.
Co-reporter:Jianhua Zhou;Xin Chen;Hao Duan
Polymer International 2015 Volume 64( Issue 10) pp:1373-1380
Publication Date(Web):
DOI:10.1002/pi.4926
Abstract
A core–shell fluorine–silicon modified polyacrylate hybrid latex was successfully prepared via emulsifier-free emulsion polymerization. The chemical composition and core–shell morphology of the resultant hybrid particles were investigated using 1H NMR and Fourier transform infrared spectroscopies and transmission electron microscopy (TEM), respectively. TEM analysis indicated that the core–shell hybrid particles were uniform with narrow size distributions. The particle size and zeta potential decreased with an increase of alkylvinylsulfonate surfactant from 2.5 to 6.0 wt%. X-ray photoelectron spectroscopy revealed that fluorine concentrated preferentially at the film surface during a film-formation process. The film formed from the fluorine–silicon modified polyacrylate showed much higher thermal stability than a film formed from polyacrylate and fluorine-modified polyacrylate. Contact angle results showed that a finished fabric had remarkable water repellency. © 2015 Society of Chemical Industry
Co-reporter:Qianqian Fan, Jianzhong Ma, Qunna Xu, Jing Zhang, Demetra Simion, Gaidău Carmen, Congsheng Guo
Colloids and Surfaces B: Biointerfaces 2015 Volume 128() pp:181-190
Publication Date(Web):1 April 2015
DOI:10.1016/j.colsurfb.2015.02.033
•We introduce the advances in modifications of animal-derived natural products.•Some novel modification methods and structures of animal-derived natural products are summarized.•Modified casein and collagen can be used as the leather finishing agents.•Chitosan-based absorbents hold much promise on pollutant removal.•Casein or chitosan based carriers exhibit good drug releasing properties.Bio-based natural products have attracted exploding interests, while the environmental pollutions caused by the synthetic polymers are deteriorating dramatically. In this review, we provide a comprehensive overview of the modification of animal-derived natural products with an emphasis on casein, chitosan and collagen. Furthermore, their novel applications in controlled drug delivery system, leather finishing, and pollutant adsorption are also demonstrated. Accordingly, some perspectives in the future development of animal-derived natural products are further proposed.
Co-reporter:Dangge Gao;Wenbo Zhang
Journal of Coatings Technology and Research 2015 Volume 12( Issue 6) pp:997-1004
Publication Date(Web):2015 November
DOI:10.1007/s11998-015-9685-0
Alcohols such as ethanol, isopropanol, n-propanol, and ethylene glycol were introduced into waterborne polyacrylate latex to study their influence on their stability and mechanical properties of polyacrylate. Ethanol, n-propanol, isopropanol, and ethylene glycol were showed to keep the polyacrylate latex steady when the pH values were higher than 3.00, 6.00, 3.00, and 2.50, respectively, as determined by centrifugation. The latex stability vs time was studied by Turbiscan LAB and the results are in good agreement with the change of latex particle size observed by dynamic light scattering. The results indicate that the particle size was affected by the alcohol molecular structure. Alcohol amounts and type had effects on breaking strength and elongation at break of polyacrylate film to varying degrees. The latex film-forming process was measured and morphology of the latex film was observed by scanning electron microscope. Different performances of mechanical properties were caused by the morphology of latex film resulting from the forming process.
Co-reporter:Fan Zhang, Jianzhong Ma, Qunna Xu, Jianhua Zhou, Demetra Simion, Gaidău Carmen
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2015 Volume 484() pp:329-335
Publication Date(Web):5 November 2015
DOI:10.1016/j.colsurfa.2015.08.011
•A novel and facile method for developing nanostrucured casein-based hollow spheres was proposed, which has been rarely reported.•Casein, besides its matrix advanced function, also plays a key role in stabilizing and emulsifying the emulsion.•The as-prepared hollow nano-structured coatings material displays good film-forming ability at room-temperature, which make it a good candidate for coating material.Room-temperature-film-formable casein-based hollow nanospheres, in which modified casein act as the shell and hollow interior as the core were innovatively prepared by alkali swelling process. Results of the TEM, AFM and DLS definitely confirmed the hollow structure and nano size of the as-prepared emulsion. The results also revealed that a film is easily formed on substrates like quartz glasses at room-temperature. The resultant thin films with hemispherical protrusions on surface make them good candidates in coating applications. A formation mechanism of coatings with this hollow nanosphere was then proposed accordingly.The possible film-forming mechanism of casein-based hollow nanospheres.
Co-reporter:Jianzhong Ma, Xiaoyan Zhang, Yan Bao, Junli Liu
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2015 Volume 472() pp:21-25
Publication Date(Web):5 May 2015
DOI:10.1016/j.colsurfa.2015.02.019
•A superhydrophobic coating on leather was fabricated.•The hydrophobicity was tuned by the number of spraying layer of hydrophobic SiO2.•The superhydrophobic coating could be easily restored.A facile spraying method was developed to fabricate superhydrophobic leather coating. The coating was obtained by spraying polyacrylate emulsion and followed by spraying ethanol dispersion of hydrophobic silica nanoparticles. The hydrophobicity of the obtained coating could be tuned by varying the number of spraying layers of hydrophobic silica nanoparticles. The coating was universal on other cellulose-based substrates.
Co-reporter:Jianzhong Ma, Changfeng Gan, Qunna Xu, Jianhua Zhou, Jing Zhang
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2015 471() pp: 65-72
Publication Date(Web):
DOI:10.1016/j.colsurfa.2015.02.027
Co-reporter:Junli Liu, Jianzhong Ma, Yan Bao, John Wang, Zhenfeng Zhu, Huiru Tang, Limin Zhang
Composites Science and Technology 2014 Volume 98() pp:64-71
Publication Date(Web):27 June 2014
DOI:10.1016/j.compscitech.2014.02.019
Film-forming agents of polyacrylate/ZnO nanocomposite are formed by in situ emulsion polymerization of acrylate monomers in the presence of ZnO nanostructures with various morphologies including sphere-like, rod-like, sheet-like, needle-like and flower-like. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to quantify the nanocomposites thus obtained. Nuclear magnetic resonance (NMR) was employed to investigate the intermolecular interactions in the polyacrylate/ZnO nanocomposites. The impact of ZnO nanostructures with various morphologies on the antibacterial behavior, water vapor permeability and mechanical properties is established. ZnO nanoparticles are well dispersed in polyacrylate matrix. Flower-like ZnO nanoparticles exhibit weak interactions with the polymer chains, while those containing flower-like or sphere-like ZnO show improved antibacterial effects against both aspergillus flavus and candida albicans. Water vapor permeability of polyacrylate/ZnO nanocomposites were increased by 122.17% with the addition of the flower-like ZnO nanoparticles. In comparison, sphere-like ZnO is favorable for improving the mechanical behavior.
Co-reporter:Yan Bao, Yonghui Zhang, Jianzhong Ma, Yanru Zhao and Duoduo Wu
RSC Advances 2014 vol. 4(Issue 63) pp:33198-33205
Publication Date(Web):18 Jul 2014
DOI:10.1039/C4RA05331A
Large-scale one-dimensional (1-D) ZnO nanoarrays (NAs) with controllable density and diameter have been successfully fabricated on silver plated aluminium through a simple, low-temperature, two-step strategy. Besides, the silver trap structures constructed based on the prepared 1-D ZnO NAs as the building blocks and their performance in the secondary electron yield suppression were discussed. X-ray diffraction and energy dispersive spectrometry morphologies of the NAs characterized by scanning electron microscopy clarified that, for the 1-D ZnO NAs as-obtained, the density increased and the vertical alignment improved with the concentration of reactants in the aqueous solution. The average diameter of the individual ZnO nanorod varied based both on the density of the NAs and the concentration of the reactants. Increasing the dip-coating times was an effective way to get higher density ZnO NAs with better vertical alignment under the same conditions. Meanwhile, uniform and dense 1-D ZnO NAs with good alignment have been successfully fabricated on PET cloth and stainless steel mesh utilizing this strategy. As for the silver trap structures, there were no obvious differences in the NAs' density before and after the silver trap construction. However, when it came to the individual nanorods, the hexagonal surface disappeared while cylindrical ones with roughened morphology were obtained. Secondary electron yield measurements showed that the silver trap structures exhibited a 30.8% reduction in the secondary electron yield relative to the bare silver plate aluminium, which provided a promising application for this strategy to fabricate desired 1-D ZnO NAs as the building blocks.
Co-reporter:Xia Zhao, Jianzhong Ma, Hongrui Ma, Dangge Gao, Chao Zhu and Xi Luo
RSC Advances 2014 vol. 4(Issue 100) pp:56831-56837
Publication Date(Web):27 Oct 2014
DOI:10.1039/C4RA05721J
The removal of polyacrylate/nano-ZnO (PA/ZnO) from water by simultaneous biosorption and biodegradation was investigated using an activated sludge (AS) unit. About 90.9%, 93.2% and 95.1% of the total PA/ZnO was removed when the AS biomasses were 2.5, 5.0 and 10.0 g, respectively. The removal efficiency increases with the increase of initial AS concentration. More than 74.5% of the total PA/ZnO was removed in the first day, implying that biosorption was the dominant removal route. The adsorption process fitted well to the Langmuir model rather than Freundlich model. Kinetics data showed better correlation with pseudo-second order than pseudo-first order models. PA/ZnO also exhibited certain biodegradability in the activated sludge reactor. Biodegradation mechanisms of PA/ZnO were studied by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and gel permeation chromatography (GPC). The results showed that the biodegradation process occurs in the AS microorganisms mainly though chain scission. Microbial community analysis by 16S rRNA based PCR-DGGE revealed little shift in the community structure and diversity, suggesting that PA/ZnO exhibits little toxicity to microorganisms.
Co-reporter:Jianzhong Ma;Liang Shao;Chaohua Xue;Fuquan Deng;Zhouyang Duan
Polymer Bulletin 2014 Volume 71( Issue 9) pp:2219-2234
Publication Date(Web):2014 September
DOI:10.1007/s00289-014-1183-5
Ethylene vinyl acetate copolymer/thermoplastic polyurethane (EVA/TPU) blending foams are rarely reported so far because of their poor compatibility, and addition of a compatibilizer to the blend system was our major interest, which can improve interfacial adhesion between the two phases. In this paper, TPU-grafted EVA (EVA-g-TPU), as a compatibilizer, was simply prepared using maleic anhydride-grafted EVA (EVA-g-MAH) and 4,4′ diamino diphenyl methane in the mixing process of TPU and EVA matrix. Fourier transform infrared spectroscopy and differential scanning calorimetry were used to investigate the structures of EVA-g-TPU and the interfacial reaction in the mixing process, and the effect of EVA-g-TPU on compatibilization between the two phases of EVA/TPU blends was investigated using scanning electron microscopy. Finally, EVA/EVA-g-TPU/TPU foams based on the good compatibility of the resin blends were prepared, and the physical properties directly related to the compatibility were investigated as a function of the theoretical quantity (molar mass) of EVA-g-TPU (nEVA-g-TPU) in the foams. Moreover, the tensile strength, elongation at break, tear strength and compression set were improved by 19.0, 9.3, 43.6 and 7.5 %, respectively. Overall, EVA/EVA-g-TPU/TPU foams with excellent mechanical properties were obtained without sacrificing other important physical properties (lower density etc.) through popular and friendly means in this research.
Co-reporter:Chao-Hua Xue and Jian-Zhong Ma
Journal of Materials Chemistry A 2013 vol. 1(Issue 13) pp:4146-4161
Publication Date(Web):21 Dec 2012
DOI:10.1039/C2TA01073A
Prolonging the lifetime of superhydrophobic surfaces is required so that the materials can be used practically. Thus, great efforts have been made in designing surfaces that maintain micro- and nanoscaled hierarchical structures and low surface-energy property, which are necessary for superhydrophobicity, during use. It was demonstrated that improving surface mechanical strength to increase wear resistance helps maintain hierarchical roughness, retarding the loss of superhydrophobicity. Additionally, designing self-healing materials that can recover their structure and/or properties when damaged has been suggested and demonstrated to sustain the superhydrophobicity of surfaces. This review focuses on recent advances in developing mechanically durable, corrosion-resistant, self-healing, and easily repairable superhydrophobic surfaces, which will enable prolonged lifetime of superhydrophobicity for practical applications in the future.
Co-reporter:Jian-zhong Ma, Yi-hong Liu, Yan Bao, Jun-li Liu, Jing Zhang
Advances in Colloid and Interface Science 2013 Volumes 197–198() pp:118-131
Publication Date(Web):September 2013
DOI:10.1016/j.cis.2013.04.006
Highlights
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Materials and achievements for the particular polymer emulsion are summarized.
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An overview of applications on a large scale of polymer emulsion with core-shell structure is provided.
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The progress of polymer emulsion with core-shell structure is presented.
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The directions of scientific researches and industrial application in the future are pointed out.
Co-reporter:Dong Yang, Jianzhong Ma, Qinlu Zhang, Ningning Li, Jiangcun Yang, Paul Ananda Raju, Mingli Peng, Yanling Luo, Wenli Hui, Chao Chen, and Yali Cui
Analytical Chemistry 2013 Volume 85(Issue 14) pp:6688
Publication Date(Web):June 4, 2013
DOI:10.1021/ac400517e
Immediate response for disease control relies on simple, inexpensive, and sensitive diagnostic tests, highly sought after for timely and accurate test of various diseases, including infectious diseases. Composite Fe3O4/Au nanoparticles have attracted considerable interest in diagnostic applications due to their unique physical and chemical properties. Here, we developed a simple coating procedure for gold magnetic nanoparticles (GMNs) with poly(acrylic acid) (PAA). PAA-coated GMNs (PGMNs) were stable and monodispersed and characterized by Fourier transform-infrared spectroscopy (FT-IR), transmission electron microscopy, UV–visible scanning spectrophotometry, thermogravimetric analysis, and Zetasizer methodologies. For diagnostic application, we established a novel lateral flow immunoassay (LFIA) strip test system where recombinant Treponema pallidum antigens (r-Tp) were conjugated with PGMNs to construct a particle probe for detection of anti-Tp antibodies. Intriguingly, the particle probes specifically identified Tp antibodies with a detection limitation as low as 1 national clinical unit/mL (NCU/mL). An ample pool of 1020 sera samples from three independent hospitals were obtained to assess our PGMNs-based LFIA strips, which exhibited substantially high values of sensitivity and specificity for all clinical tests (higher than 97%) and, therefore, proved to be a suitable approach for syphilis screening at a point-of-care test manner.
Co-reporter:Jianzhong Ma, Junli Liu, Yan Bao, Zhenfeng Zhu, Xiaofeng Wang, Jing Zhang
Ceramics International 2013 Volume 39(Issue 3) pp:2803-2810
Publication Date(Web):April 2013
DOI:10.1016/j.ceramint.2012.09.049
Abstract
Large-scale uniform mulberry-like ZnO particles were successfully synthesized via a fast and simple microwave hydrothermal method. The formation mechanism of mulberry-like ZnO particles was investigated by adding different types of alkalis and different amounts of triethanolamine (TEA). Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to observe the morphology and crystal structure of the obtained ZnO. The results revealed that the as-prepared ZnO products had an average diameter of about 150 nm and polycrystalline wurtzite structure. The existence of TEA was vital for the formation of nanoparticle-assembled mulberry-like ZnO particles. These mulberry-like ZnO particles exhibited stronger antibacterial effects on Candida albicans than did sheet-like and flower-like ZnO.
Co-reporter:Jianzhong Ma, Qunna Xu, Jianhua Zhou, Dangge Gao, Jing Zhang, Lihong Chen
Progress in Organic Coatings 2013 Volume 76(Issue 10) pp:1346-1355
Publication Date(Web):October 2013
DOI:10.1016/j.porgcoat.2013.04.006
•Caprolactam-butylacrylate co-modified casein latex was successfully prepared without adding extra emulsifiers.•The obtained latex showed regular core–shell structure, and is less than 80 nm in size.•Caprolactam modified casein particles have been verified having emulsifying action with the butylacrylate monomers.•The mechanism for this emulsifier-free emulsion polymerization is proposed.•The as-prepared emulsion was verified has excellent application performance.Nano-scale core–shell type particle of caprolactam-butylacrylate co-modified casein (CA-CPL-BA) bearing poly(butylacrylate) core and casein-caprolactam shell was synthesized via emulsifier-free polymerization, and was applied as the film-former in leather finishing. By utilizing potassium persulfate–sodium hydrogensulfite as a redox pair during preparing CA-CPL-BA, the grafting extent was superior to that initiated by ammonium persulfate–sodium hydrogensulfite, potassium persulfate or ammonium persulfate. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) analysis results demonstrated that the average size of neat casein particle was around 700 nm while the resultant CA-CPL-BA latex particles were significantly decreased to about 80 nm in size. Compared with those of neat casein films, enhanced hydrophobicity and higher thermo-stability of the CA-CPL-BA latex film were confirmed by contact angle test and thermal gravimetric (TG) measurement, respectively. Meanwhile, the application performance of the leather samples finished by CA-CPL-BA was proved to be equivalent to that finished by the commercial leather finishing agent product. A possible mechanism of emulsifier-free polymerization for this system was proposed and then proved. Biodegradability tested by soil burial degradation experiments proved that CA-CPL-BA had preferable biodegradability.
Co-reporter:Ma Jianzhong;Junli Liu;Yan Bao;Zhenfeng Zhu;Hui Liu
Crystal Research and Technology 2013 Volume 48( Issue 4) pp:251-260
Publication Date(Web):
DOI:10.1002/crat.201300026
Abstract
ZnO nanostructures with various morphologies including rod-like, sheet-like, needle-like and flower-like structures were successfully synthesized via a fast and facile microwave-assisted hydrothermal process. Reaction temperature, reaction time and the addition of NaOH were adjusted to obtain ZnO with different morphologies. Scanning electron microscopy(SEM), transmission electron microscope(TEM), X-ray diffraction (XRD) and ultraviolet spectrophotometer (UV) were used to observe the morphology, crystal structure, ultraviolet absorption and photocatalytic activity of the obtained ZnO. The results indicated that growth rate of ZnO nanostructure along [001] direction was more sensitive to temperature compared with those along [101] and [100] directions. The competition between anionic surfactant and OH− played an important role in the formation of ZnO with various morphologies. Flower-like ZnO had better ultraviolet absorption property and excellent photocatalytic activity than ZnO in the other morphologies. On the basis of the above results, a possible growth mechanism for the formation of ZnO nanostructures with different morphologies was described.
Co-reporter:Jianzhong Ma, Qunna Xu, Jianhua Zhou, Jing Zhang, Limin Zhang, Huiru Tang, Lihong Chen
Colloids and Surfaces B: Biointerfaces 2013 Volume 111() pp:257-263
Publication Date(Web):1 November 2013
DOI:10.1016/j.colsurfb.2013.06.011
•Core–shell casein based silica nono-composite film-forming material for ibuprofen carrier was successfully fabricated.•The as-prepared films were found to be pH responsive.•Silica content was proved to have positive effects on drug loading capacity and drug releasing behavior of the composite films.Casein possesses many interesting properties that make it a good candidate for conventional and novel drug delivery systems. In this study, casein-based silica nano-composite was prepared via double in situ method, and the as-prepared latex particles were evaluated in terms of their morphology and size through transmission electron microscopy (TEM). The film morphology was investigated by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX), and the mechanical property and response behavior of the films as a function of silica content were discussed. Ibuprofen was used as the model drug. The drug load and release properties were studied by solid-state nuclear magnetic resonance (solid-state NMR), Fourier transform infrared (FT-IR), SEM and in vitro test. The composite latex particle showed a stable core–shell structure, and the film exhibited a regular surface with even SiO2 distribution. The drug load efficiency of the composite films increased with adding silica because of the adsorption of the drugs on the silica. In an acidic release medium, the ibuprofen-loaded composite showed a slower drug release dependent on the silica content. These behaviors were most likely due to the reduced diffusion rate of the drug through the composite microsphere, which resulted from the interaction between the silica and the drug.
Co-reporter:Dang-Ge Gao;Chen Chen;Jian-Zhong Ma;Bin Lv
Journal of Sol-Gel Science and Technology 2013 Volume 65( Issue 3) pp:336-343
Publication Date(Web):2013 March
DOI:10.1007/s10971-012-2941-1
The zinc oxide sol containing quaternary ammonium salts (DMDAAC-ZnO) was synthesized by zinc acetate and dimethyldiallyl ammonium chloride via the sol–gel process. Effects of zinc acetate concentration, diethanolamine dosage and dimethyldiallyl ammonium chloride dosage on the absorbance-ratio and viscosity of the sol were investigated. Zinc oxide sols were characterized by XRD, TEM and FT-IR. DMDAAC-ZnO was applied to cotton samples and cotton samples treated were tested by antibacterial activity, UV resistance and breaking strength. The antibacterial activity and UV resistance of samples treated by zinc oxide sol containing quaternary ammonium salt were both better than sample treated by zinc oxide sol.
Co-reporter:Yan Bao, Jianzhong Ma, Yaogang Sun
Carbohydrate Polymers 2012 Volume 88(Issue 2) pp:589-595
Publication Date(Web):2 April 2012
DOI:10.1016/j.carbpol.2012.01.003
A series of cellulose/acrylic polymer/inorganic particle superabsorbent composites were prepared by graft copolymerization of acrylic monomer onto various cellulose derivatives and inorganic particles. The effects of cellulose derivatives and inorganic particles on equilibrium water absorbency and swelling rate of these superabsorbent composites were investigated. For the composites incorporated with different cellulose derivatives, equilibrium water absorbency and the swelling rate in distilled water and saline solution are always in the order carboxymethyl cellulose > without cellulose > hydroxypropyl methyl cellulose > methyl cellulose > hydroxyethyl cellulose. Silicon dioxide (SiO2) and titanium dioxide (TiO2) based superabsorbent composites acquired the equilibrium water absorbency in distilled water as good as that of montmorillonite (MMT) based one and prior to that without inorganic particle. However, the equilibrium water absorbency of SiO2 and TiO2 based superabsorbent composites in saline solution are similar to that of zinc oxide (ZnO) and aluminum oxide (Al2O3) based ones.Highlights► A series of cellulose/acrylic polymer/inorganic particle composites were prepared. ► Swelling properties of composite vary with different cellulose. ► Composite swelling depends on IEP and hydroxyls number of inorganic particle. ► Composites doped with different inorganic particles exhibit their own advantages.
Co-reporter:Jianzhong Ma, Qunna Xu, Dangge Gao, Jianhua Zhou, Jing Zhang
Polymer Degradation and Stability 2012 Volume 97(Issue 8) pp:1545-1552
Publication Date(Web):August 2012
DOI:10.1016/j.polymdegradstab.2012.04.015
Biodegradable composites of caprolactam-modified casein and waterborne polyurethane (CA-CPL/WPU) for film-forming binder were prepared in composition of 5:5, 6:4, 7:3, 8:2, 9:1 (w/w) via blending. Influences of WPU amount on miscibility, morphology and properties of the composites were investigated. Flourier transform infrared (FT-IR), transmission electron microscopy (TEM) and dynamic laser scattering (DLS) verified that hydrogen bonding interaction existed at the interfaces of CA-CPL and WPU, which had great influence on particle morphology and miscibility. Film properties were studied by scanning electron microscopy (SEM) and contact angle analysis, confirming the reduced pores but enhanced hydrophobicity of CA-CPL/WPU when compared to those of control system. CA-CPL/WPU was applied as the film-forming binder in leather finishing, performances of leather samples improved with an increase in elongation at break from 72.46% to 99.77% and wet rub resistance fastness from 3 to 4–5.However, air permeability reduced from 223.46 to 117.04 (mL/(cm2∙h)).
Co-reporter:Dang-Ge Gao;Jian-Zhong Ma;Hai-Qing Guo
Polymers for Advanced Technologies 2012 Volume 23( Issue 11) pp:1494-1499
Publication Date(Web):
DOI:10.1002/pat.2071
Using diallylmethyl alkyl ammonium salts (CCX) (X is alkyl's chain length, represents 12, 14, 16, and 18, respectively) as a comonomer of methacrylic (MAA), hydrophobically modified hydrogels of poly diallylmethyl alkyl ammonium salts-methacrylic acid (PCCX-MAA) were prepared by free radical copolymerization in aqueous solution. The synthetic conditions, such as dosage of cross-linking agent, reaction concentration and length of alkyl chain were studied in detail. Results indicated that the swelling degree of hydrogels was decreased with dosage of cross-linking agent, or monomer concentration increased at different pH. Incorporation of the different length of alkyl chain hydrophobic CCX units on PMAA chains by random distribution can change reswelling kinetics. The required time for reaching equilibrium swelling state was longest for PCC16-MAA. Copyright © 2011 John Wiley & Sons, Ltd.
Co-reporter:Yan Bao, Jianzhong Ma, Na Li
Carbohydrate Polymers 2011 Volume 84(Issue 1) pp:76-82
Publication Date(Web):11 February 2011
DOI:10.1016/j.carbpol.2010.10.061
Superabsorbents were synthesized by graft copolymerization of acrylic acid (AA)/acrylamide (AM)/2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) onto sodium carboxymethyl cellulose (CMC) and montmorillonite (MMT) by using potassium persulfate (KPS) as a free radical initiator, in the presence of N,N′-methylenebisacrylamide (MBA) as a crosslinking agent. The structure and morphologies of the superabsorbents were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscope (SEM). Superabsorbent comprised a porous crosslink structure of MMT and CMC with side chains that carry carboxylate, carboxamide and sulfate. The swelling behaviors of the superabsorbent were dependant on the pH of external solutions, particle size and the concentration of the salt solution. The effect of four cationic salt solutions on the swelling had the following order: K+ > Na+ > Ca2+ > Mg2+.
Co-reporter:Qunna Xu, Fan Zhang, Jianzhong Ma, Tao Chen, Jianhua Zhou, Demetra Simion, Gaidău Carmen
Progress in Organic Coatings (November 2015) Volume 88() pp:1-7
Publication Date(Web):1 November 2015
DOI:10.1016/j.porgcoat.2015.06.011
•A facile way for developing nano-scale casein-based hybrid particles was proposed.•The presence of silane endowed the composite film with superior properties.•The as-prepared nano-composite can be a good candidate for coatings.Silane coupling agents are recognized as efficient coupling agents extensively used in composites and adhesive formulations. In this paper, casein-based silica nano-composite latex for coatings was prepared via double-in situ method stabilized by methyl propyl trimethoxy silane (KH570) – a kind of silane coupling agent. The latex was mainly characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), scanning electron microscopy (SEM), atomic force microscopy (AFM) and thermogravimetry (TGA). Effects of KH570 on the structure and performance of the latex and film, as well as the application performance were discussed systematically. The results showed that the presence of KH570 increased the silica-shell uniformity due to the improvement of the compatibility between the organism and inorganism. Existence of KH570 could endow the hybrid film with enhanced mechanical strength, water resistance and heat resistance. The as-prepared composite may also give finished leather with preferred wet/dry rub resistance, water resistance and tensile strength. Latex particle formation mechanism was proposed accordingly.Download full-size image
Co-reporter:Bin Lyu, Jianjing Gao, Jianzhong Ma, Dangge Gao, Hongdi Wang, Xuewu Han
Applied Clay Science (March 2016) Volumes 121–122() pp:36-45
Publication Date(Web):March 2016
DOI:10.1016/j.clay.2015.12.021
Co-reporter:Jianzhong Ma, Xueyan Hou, Dangge Gao, Bin Lv, Jing Zhang
Journal of Cleaner Production (1 September 2014) Volume 78() pp:226-232
Publication Date(Web):1 September 2014
DOI:10.1016/j.jclepro.2014.04.058
•An efficient soaking compound enzyme was prepared.•Synergistic schematic of the multi-enzyme system was investigated.•This work is beneficial to the research of compound enzyme product.•The compound enzyme soaking liquor was more readily biodegradable.Enzymes have been used as one of the most promising substitutes for traditional chemicals in soaking process. In this work, three alkaline proteases, TanG, LimeG and FP50, were used in skin soaking process to select appropriate enzymes. Then the pre-optimized enzymes and additives were mixed to prepare a soaking compound enzyme (KRE). The optimal temperature and pH of the compound enzyme were determined. Finally, the KRE was used in skin soaking process and compared with commercial soaking enzyme (CSE). Environmental impact of KRE was assessed. Protein and hydroxyproline absorbance in soaking bath were chosen as the indexes of the degree of enzymatic hydrolysis to protein and collagen of skin. The results indicated that the combination of TanG and LimeG had a good synergistic effect in soaking process. The optimal temperature of KRE was obtained. KRE had high activity at alkaline pH. Compared with CSE, KRE had stronger hydrolytic action to protein in the skin, but the damage to collagen was of no significant difference from that of CSE. The reduction in turbidity, suspended solids (SS), Biochemical oxygen demand (BOD5) and Chemical oxygen demand (CODCr) content in KRE soaking effluent compared to CSE soaking was evident from environmental impact assessment. Moreover, the BOD5/CODCr of KRE soaking liquor was 0.8976 which indicated that the wastewater was biodegradable. The KRE soaking wastewater would not increase contaminants of the total tanning wastewater significantly. KRE can be regarded as eco-friendly material, reducing the environmental impacts and contributing to the development of cleaner leather processing.Download full-size image
Co-reporter:Jianzhong Ma, Xiujuan Lv, Dangge Gao, Yun Li, Bin Lv, Jing Zhang
Journal of Cleaner Production (1 June 2014) Volume 72() pp:120-126
Publication Date(Web):1 June 2014
DOI:10.1016/j.jclepro.2014.03.016
•Nanocomposites could improve chromium uptake significantly in suede leather making.•Nanocomposites could endow suede leather uniform fluff and comfortable handle.•The collagen fibre treated with nanocomposites seemed to be welled-dispersed.•The wastewater of nanocomposites tanning was easily biodegradable.A nanocomposite-based green tanning process of suede leather was developed, which could be recognized as an eco-friendly chrome-less tanning process. In this study, nanocomposites were applied in tanning and retanning process during suede leather making. Effects of nanocomposites on shrinkage temperature, mechanical properties, softness, biodegradability of the leather samples were investigated; The resulting leather was characterized by scanning electron microscopy and atomic force microscopy; Effects of nanocomposites on the chromium load, biochemical oxygen demand, chemical oxygen demand in the wastewater were analysed. The results show that the addition of nanocomposites could endow the leather with high hydrothermal stability, biodegradability and softness; The mechanical properties of the leather treated with nanocomposites were close to those of the chrome-treated leather; The SEM and AFM indicated the resulting leather treated with nanocomposites contained well-dispersed fibrils and uniform fluff. Additionally, it was found that nanocomposites applied in the tanning and retanning processes brought better chromium uptake and reduction of chromium load in the wastewater. The ratio of biochemical oxygen demand and chemical oxygen demand in the wastewater was 0.37, which demonstrates that the effluent of less chrome combination retanning systems was more easily biodegradable than that of the chrome retanning process and the experimental process exhibited lowest chemical cost as compared to the chrome tanning process. Nanocomposites applied in the suede leather making process could improve the properties of the resulting leather and help to realize the cleaner production.
Co-reporter:Chao-Hua Xue and Jian-Zhong Ma
Journal of Materials Chemistry A 2013 - vol. 1(Issue 13) pp:NaN4161-4161
Publication Date(Web):2012/12/21
DOI:10.1039/C2TA01073A
Prolonging the lifetime of superhydrophobic surfaces is required so that the materials can be used practically. Thus, great efforts have been made in designing surfaces that maintain micro- and nanoscaled hierarchical structures and low surface-energy property, which are necessary for superhydrophobicity, during use. It was demonstrated that improving surface mechanical strength to increase wear resistance helps maintain hierarchical roughness, retarding the loss of superhydrophobicity. Additionally, designing self-healing materials that can recover their structure and/or properties when damaged has been suggested and demonstrated to sustain the superhydrophobicity of surfaces. This review focuses on recent advances in developing mechanically durable, corrosion-resistant, self-healing, and easily repairable superhydrophobic surfaces, which will enable prolonged lifetime of superhydrophobicity for practical applications in the future.
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