Co-reporter:Na Yin;Shi-yan Chen 陈仕艳;Yi-meng Cao;Hua-ping Wang
Chinese Journal of Polymer Science 2017 Volume 35( Issue 3) pp:354-364
Publication Date(Web):2017 March
DOI:10.1007/s10118-017-1903-z
Bacterial cellulose/lotus root starch (BC/LRS) composites were prepared by cultivating Acetobacter xylinum in nutrient media containing gelatinized lotus root starch. Low concentrations of gelatinized LRS had increased BC production with the maximum value at 6.67 g/L when 5 g/L of LRS was added in the culture media and the composites had thicker and denser fibrils compared with those of BC with low concentrations of LRS (2.5 and 5 g/L). When the concentration of LRS was increased above 7.5 g/L, the morphology of the BC/LRS composites contained more fibril layers that were linked with LRS. The results from X-ray diffraction (XRD) demonstrated that there was no significant difference in structure between BC and BC/LRS composites except a slight increase in crystallinity for BC/LRS composites as the concentration of LRS was lifted up. The tensile tests were performed to display BC/LRS composites prepared with LRS concentration at 2.5 and 5 g/L in media had the tensile strength of 54 and 60 MPa, respectively, which indicated an improvement in mechanical property compared to the unmodified BC (45 MPa). Live/dead assay with chondrocytes seeded on BC/LRS composite revealed higher cell viability ranging from 85% to 90% than BC. Furthermore, cell morphology with typical spindle shape was observed on the surfaces of BC/LRS composite by confocal microscope. Through the overall results, it shows that this study has provided a guidance to prepare BC/LRS composites with better cell biocompatibility and higher mechanical strength than those of BC for the potential use in cartilage tissue engineering.
Co-reporter:Baoxiu Wang;Xiangguo Lv;Zhe Li;Jingjing Yao;Xufeng Peng
Cellulose 2017 Volume 24( Issue 11) pp:5013-5024
Publication Date(Web):30 August 2017
DOI:10.1007/s10570-017-1472-x
Due to its unique properties, bacterial cellulose (BC) has attracted a great deal of interest as an implant material for tissue regeneration. However, one major problem of BC is inadequate vascularization which leads to cell apoptosis due to insufficient nutrients and oxygen supply. Herein, porous BC/gelatin (BC/Gel) scaffolds loaded with vascular endothelial growth factor (VEGF) with silk fibroin nanoparticles (VEGF-NPs) were prepared. An in vitro study indicated that VEGF was sustainably released from the BC/Gel/VEGF-NPs scaffold over 28 days. Cell viability, morphology and proliferation were evaluated using Live/Dead® viability/cytotoxicity assay, field emission scanning electron microscopy and CCK-8 assay by seeding the scaffolds with pig iliac endothelium cells. The presence of VEGF-NPs in the scaffold significantly improved cell proliferation and viability in vitro. Evaluation of in vivo biocompatibility and angiogenesis of the BC/Gel/VEGF-NPs scaffold was conducted using a dog skin defect model. Results indicated that the BC/Gel/VEGF-NPs scaffold significantly promoted vessel blood formation after implantation compared to the BC/Gel and BC/Gel/NPs scaffolds. It is concluded that angiogenesis could be improved through the incorporation of VEGF-NPs into the BC/Gel scaffold, which may enhance clinically desirable functions of BC-based scaffolds in terms of enhanced angiogenesis.
Co-reporter:Zhe Li, Xiangguo Lv, Shiyan Chen, Baoxiu Wang, Chao Feng, Yuemin Xu and Huaping Wang
RSC Advances 2016 vol. 6(Issue 48) pp:42229-42239
Publication Date(Web):22 Apr 2016
DOI:10.1039/C6RA07685H
A significant problem limiting the application of bacterial cellulose (BC) nanofibrous scaffolds for tissue regeneration is the nanoscale pores that inhibit cell infiltration and vascularization in their three-dimensional (3D) structure. In this paper, a facile method was used to fabricate 3D microporous nanofibrous gelatin/BC composite scaffolds (Gel/BC) by stationary cultivation Gluconacetobacter xylinus using microporous gelatin scaffold as a template. The Gel/BC scaffolds with highly interconnected micropore (171 ± 71 μm) and surface decorated on the micropore walls by BC nanofibers (25.2 ± 7.0 nm) were fabricated, which are remarkably similar in structure to the native extracellular matrix (ECM). Cell distribution, viability and morphology were evaluated by seeding adipose-derived stem cells (ADSCs) on the scaffolds, using the 3D laser scanning confocal microscopy (3D-LSCM), LIVE/DEAD® viability/cytotoxicity assay and field emission scanning electron microscopy (FE-SEM). In vivo biocompatibility was evaluated by subcutaneous implantation using a dog model for 2 weeks. These results indicate that the 3D microporous nanofibrous scaffolds exhibit good biocompatibility, promoting cellular attachment, proliferation and maintain cellular phenotype, improving cellular infiltration and vascularization. It is anticipated that this 3D microporous nanofibrous scaffold can be applied in the fields such as medical implants, cell supports, and materials, which can be used as instructive 3D environments for tissue regeneration.
Co-reporter:Fangyi Guan, Shiyan Chen, Jingjing Yao, Weili Zheng, Huaping Wang
Journal of Materials Science & Technology 2016 Volume 32(Issue 2) pp:153-157
Publication Date(Web):February 2016
DOI:10.1016/j.jmst.2015.08.014
ZnS/bacterial cellulose/epoxy resin (ZnS/BC/E56) nanocomposites with good transparency and flexibility were prepared and characterized. When the precursor Zn2+ concentrations were not more than 1 wt%, the size of the introduced ZnS nanoparticles was smaller than 50 nm and the distribution was homogeneous within the composites. Under the condition, outstanding transmittance more than 70% in the visible light was obtained. By incorporation of ZnS nanoparticles with excellent thermo-optic stability to the composites, the thermo-optic coefficient was obviously increased from −361 × 10−6 to −310 × 10−6 K−1. The good flexibility, optical and mechanical properties endow the nanocomposites potential applications in the flexible optoelectronic materials.
Co-reporter:Lian Tang;Yi Zheng;Lei Wang ;Huaping Wang
Journal of Applied Polymer Science 2016 Volume 133( Issue 11) pp:
Publication Date(Web):
DOI:10.1002/app.43120
ABSTRACT
Flexible and nonpoisonous X-ray-shielding membranes supported by bacterial cellulose (BC) were prepared, in which X-ray-shielding materials were of microcapsule structure by using polyvinyl alcohol as shell and lead salt as core. The effect of the wall/core interaction and the amount of cross-linking agent were taken into consideration to find the optimal reaction conditions. The morphology, microcapsule size, and lead salt release properties were investigated. After supported by BC, the flexible and potable membranes for X-ray radiation protection were prepared and the shielding properties were evaluated, which indicated a good X-ray-shielding material. We set up a new method to prepare flexible and portable X-ray radiation protection membranes. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43120.
Co-reporter:Zhixing Li, Na Liu, Yongbo Yao, Shiyan Chen, Haifeng Wang and Huaping Wang
RSC Advances 2015 vol. 5(Issue 2) pp:901-907
Publication Date(Web):12 Nov 2014
DOI:10.1039/C4RA10618K
1-Butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) was chosen as a plasticizer for cellulose diacetate (CDA) to investigate the feasibility of CDA melt spinning. [BMIM]BF4/CDA was characterized by Fourier transform infrared (FTIR) spectroscopy, dynamic thermomechanical analysis (TG), the degree of crystallinity (XRD), scanning electron microscopy (SEM) and the thermal stability of CDA. The rheological properties of [BMIM]BF4/CDA were investigated by a rotary rheometer and the zero-shear viscosity was predicted by the three-parameter Carreau viscosity model from apparent viscosity data. The [BMIM]BF4/CDA melt showed a shear-thinning behaviour. The melt with higher CDA concentrations and higher shear rates was found to be sensitive to temperature; thus, we could adjust the processing technology by changing the temperature and shear rate. However, the structural viscosity index of the melt decreased with increase in the [BMIM]BF4 content and went up after a decline with temperature increase.
Co-reporter:Yan Ge, Shiyan Chen, Jingxuan Yang, Biao Wang and Huaping Wang
RSC Advances 2015 vol. 5(Issue 69) pp:55756-55761
Publication Date(Web):19 Jun 2015
DOI:10.1039/C5RA08361C
Color-tunable luminescent membranes of CdTe QDs on bacterial cellulose (BC) nanofibers were successfully fabricated by in situ synthesis in aqueous solution. No nitrogen protection and expensive reagents are needed during the preparation process. The luminescent color of the CdTe/BC nanocomposite membranes with green, orange and red luminescence can be tuned easily by controlling the reaction time. The prepared CdTe/BC nanocomposites were characterized by X-ray diffraction (XRD), field effect scanning electron microscopy with energy dispersive X-ray analysis (FESEM-EDX) and transmission electron microscopy (TEM). Ultraviolet-visible (UV-vis), photoluminescence (PL) spectra and PL quantum efficiency (PL QE) were used to investigate the optical properties. Moreover, we attempted to make the luminescent membranes into an ion test paper. The green luminescent membranes had a good selectivity for Cu2+ with a detection limit of 0.016 mM and the mechanism of quenching Cu2+ were also explored. This work provides a simple, effective and eco-friendly method for the construction of luminescent CdTe QDs on BC membranes with high detectability for detection of Cu2+.
Co-reporter:Xiao Zhang;Zhongli Wang;Zheng Zhao;Wei Yuan;Huaping Wang;Xike Gao
Chinese Journal of Chemistry 2014 Volume 32( Issue 10) pp:1057-1064
Publication Date(Web):
DOI:10.1002/cjoc.201400488
Abstract
Three naphthalene diimides (2, 3 and 4) fused with 2-(1,3-dithiol-2-ylidene)-2-fluorophenylacetonitrile moieties were designed and synthesized. Due to the different substituted positions of fluorine atom on the phenyl group, the solution-processed thin films of 2 and 3 operated in air as n-channel transistors, while the films of 4 performed as ambipolar transistors, indicating that the variation of substituted position of fluorine atom on molecular backbone may tune the material's charge transport behavior.
Co-reporter:Weili Zheng;Siyu Zhao;Yi Zheng ;Huaping Wang
Journal of Applied Polymer Science 2014 Volume 131( Issue 19) pp:
Publication Date(Web):
DOI:10.1002/app.40874
ABSTRACT
Spherical zinc sulfide (ZnS) nanoparticles dispersed on bacterial cellulose (BC) nanofibers homogeneously were successfully fabricated through in situ precipitation method using BC as template and explored the formation mechanism. The structure and properties were characterized by Fourier transform infrared, X-ray diffractometer, FESEM, and so on. The results demonstrated that the nanoparticles were sphalerite structure ZnS and the size increased with the increase of the zinc precursor concentrations. Moreover, a high photocatalytic activity (92%) for degradation of methyl orange was observed and the photoluminescence spectra of the nanocomposites exhibited a blue emission band centered at 468 nm. The flexible BC membrane carried of ZnS nanoparticles might be a promising candidate in the application fields of fluorescence and photo-catalysis. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40874.
Co-reporter:Wei-li Zheng;Wei-li Hu;Shi-yan Chen 陈仕艳;Yi Zheng
Chinese Journal of Polymer Science 2014 Volume 32( Issue 2) pp:169-176
Publication Date(Web):2014/02/01
DOI:10.1007/s10118-014-1386-0
The freshly prepared water-wet amidoximated bacterial cellulose (Am-BC) serves as an effective nanoreactor to synthesis zinc oxide nanoparticles by in situ polyol method. The obtained ZnO/Am-BC nanocomposites have been characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The influence of the zinc acetate concentration on the morphologies and size of ZnO nanoparticles and the possible formation mechanism were discussed. The results indicated that uniform ZnO nanoparticles were homogeneously anchored on the Am-BC nanofibers through strong interaction between the hydroxyl and amino groups of Am-BC and ZnO nanoparticles. The loading content of ZnO nanoparticles is higher using Am-BC as a template than using the unmodified bacterial cellulose. The resultant nanocomposite synthesized at 0.05 wt% shows a high photocatalytic activity (92%) in the degradation of methyl orange.
Co-reporter:Shiyan Chen, Yan Zhao, Altan Bolag, Jun-ichi Nishida, Yunqi Liu, and Yoshiro Yamashita
ACS Applied Materials & Interfaces 2012 Volume 4(Issue 8) pp:3994
Publication Date(Web):July 30, 2012
DOI:10.1021/am300822z
π-Conjugated systems 2a and 2b containing thiophene-fused DCNQI with long alkyl and trifluoromethylphenyl groups were synthesized as potential active materials for solution-processed and air-stable n-type organic thin-film transistors (OTFTs). The electrochemical measurements revealed that the lowest unoccupied molecular orbital (LUMO) of the compounds have an energy level less than −4.0 eV, indicating air stable n-type materials. The long alkyl groups endowed the compounds good solubility and solution-processability. X-ray diffraction measurements revealed the difference of the molecular arrangement depending on the alkyl groups, which were also observed in the UV–vis absorptions of the films. A relatively good mobility up to 0.003 cm2 V–1 s–1 for 2a by spin-coating was obtained with good air stability.Keywords: air-stable; n-type; organic thin-film transistors; solution-processed; thiophene-fused DCNQI;
Co-reporter:Na Yin, Shiyan Chen, Zhe Li, Yang Ouyang, Weili Hu, Lian Tang, Wen Zhang, Bihui Zhou, Jingxuan Yang, Qiushu Xu, Huaping Wang
Materials Letters 2012 Volume 81() pp:131-134
Publication Date(Web):15 August 2012
DOI:10.1016/j.matlet.2012.04.133
Bacterial cellulose (BC) with a porous structure was prepared via a facile surfactant-assisted foaming method in azodicarbonamide (AC)-NaOH aqueous solution under mild condition. The time-saving and flexible procedure comprises immersing and foaming of BC membranes in AC solution, washing and subsequent freeze drying. The results showed that BC with the surfactant Tween 80 assisted foaming treatment had the homogeneous and interconnected spherical macroporous structure with the pore size up to 20 μm. Compared to native BC, its mesoporous surface area was increased from 56.87 m2/g to 169.86 m2/g, the porosity was increased from 28.3% to 90.8% and the maximum water adsorption was increased from 997% to 7611%.Highlights► BC with porous structure was prepared by surfactant-assisted foaming. ► Porous structure consisted of uniformly spherical macropores and enlarged mesopores. ► The maximum water adsorption of hierarchically porous BC reached up to 7611%. ► The promising porous BC can be used in adsorption, separation and other applications.
Co-reporter:Weili Hu, Shiyan Chen, Qiushu Xu, Huaping Wang
Carbohydrate Polymers 2011 Volume 83(Issue 4) pp:1575-1581
Publication Date(Web):1 February 2011
DOI:10.1016/j.carbpol.2010.10.016
Bacterial cellulose preserving the microfibrillar morphology was partially acetylated by the solvent-free acetylation method using acetic anhydride in the presence of iodine as a catalyst. The results showed that within the range of catalyst amounts studied, the overall degree of substitution increased as the amount of iodine used increased. We also found that the reaction time and temperature had an active influence on the extent of acetylation. X-ray diffraction profiles indicated that acetylation proceeded from the surface to the interior of BC nanofibers, and scanning electron microscopy images revealed that even low levels of acetylation were effective to make the nanofibers separated from each other. NMR analysis indicated the regio-nonselective reactivity of the OH groups in the glucose units in the acetylation process. The obtained acetylated BC membrane shows more hydrophobic surface and good mechanical properties which is in favor of enhancing the hydrophobic non-polar polymeric matrix.
Co-reporter:Weili Hu;Shuiping Liu;Huaping Wang
Cellulose 2011 Volume 18( Issue 3) pp:655-661
Publication Date(Web):2011 June
DOI:10.1007/s10570-011-9520-4
The photochromic bacterial cellulose (BC) nanofibrous membranes containing 1′,3′,3′-trimethyl-6-nitrospiro(2H-1-benzopyran-2,2′-indoline) (NO2SP) were successfully prepared by surface modification of BC nanofibers with spiropyran photochromes, and their physical and photochromic properties were characterized. The FTIR spectra indicated the interaction between BC and NO2SP which leads to the uniform dispersion of NO2SP in the nanofibrous membrane. SEM results demonstrated that the introduction of NO2SP maintains the nanofibrous network structure of BC. UV/vis spectrometry of the resulting BC-NO2SP revealed that the membranes show reversible photochromic property by changing their color from colorless to pink forming a merocyanine structure upon UV irradiation, and returning back again to colorless spiropyran structure by visible light. The contact angle of the BC-NO2SP with water was found to be reversibly regulated due to the reversible isomerization of the spiropyran moieties in BC-NO2SP. The result indicates that the surface modification with spiropyran photochromes expands new applications of BC nanofibers and such photochromic nanofibers with excellent photosensitivity have great potentials for sensitive displays, biosensors and other optical devices.
Co-reporter:Wen Zhang, Shiyan Chen, Weili Hu, Bihui Zhou, Zhenhua Yang, Na Yin, Huaping Wang
Carbohydrate Polymers 2011 86(4) pp: 1760-1767
Publication Date(Web):
DOI:10.1016/j.carbpol.2011.07.015
Co-reporter:Weili Hu, Shiyan Chen, Zhenhua Yang, Luting Liu, and Huaping Wang
The Journal of Physical Chemistry B 2011 Volume 115(Issue 26) pp:8453-8457
Publication Date(Web):June 14, 2011
DOI:10.1021/jp204422v
The novel conductive polyaniline/bacterial cellulose (PANI/BC) nanocomposite membranes have been synthesized in situ by oxidative polymerization of aniline with ammonium persulfate as an oxidant and BC as a template. The resulting PANI-coated BC nanofibrils formed a uniform and flexible membrane. It was found that the PANI nanoparticles deposited on the surface of BC connected to form a continuous nanosheath by taking along the BC template, which greatly increases the thermal stability of BC. The content of PANI and the electrical conductivity of composites increased with increasing reaction time from 30 to 90 min, while the conductivity decreased because of the aggregation of PANI particles by further prolonging the reaction time. In addition, the acids remarkably improve the accessibility and reactivity of the hydroxyl groups of BC. The results indicate that the composites exhibit excellent electrical conductivity (the highest value was 5.0 × 10–2 S/cm) and good mechanical properties (Young’s modulus was 5.6 GPa and tensile strength was 95.7 MPa). Moreover, the electrical conductivity of the membrane is sensitive to the strain. This work provides a straightforward method to prepare flexible films with high conductivity and good mechanical properties, which could be applied in sensors, flexible electrodes, and flexible displays. It also opens a new field of potential applications of BC materials.
Co-reporter:Shiyan Chen;Wei Shen;Feng Yu;Weili Hu ;Huaping Wang
Journal of Applied Polymer Science 2010 Volume 117( Issue 1) pp:8-15
Publication Date(Web):
DOI:10.1002/app.31477
Abstract
Amidoximated bacterial cellulose (Am-BC) was prepared through successive polymer analogous reactions of bacterial cellulose with acrylonitrile in an alkaline medium followed by reaction with aqueous hydroxylamine. It was used as an adsorbent to remove Cu2+ and Pb2+ from aqueous solutions. The adsorption behaviors of Cu2+ and Pb2+ onto Am-BC were observed to be pH-dependent. The maximum adsorption capacity of 84 and 67 mg g–1 was observed, respectively, for Cu2+ and Pb2+ at pH 5. Scanning electronic microscopy (SEM) indicated that the microporous network structure of Am-BC was maintained even after the modifacation. The adsorption mechanisms for Cu2+ and Pb2+ onto Am-BC were investigated by fourier transform infrared spectroscopy (FTIR), ζ potential measurement and X-ray photoelectron spectroscopy (XPS). The results revealed that the mechanism for the adsorption of Cu2+ onto Am-BC could be mainly described as between metal ions and nitrogen atom in the amidoxime groups or oxygen atom in the hydroxyl groups. However, in the adsorption process for Pb2+, precipitation played the important role along with electrostatic interactions, although chelation action also existed in the process accounted for the adsorption process. The regeneration of Am-BC was studied by treatment with a strong complexing agent, ethylenediaminetetracetic acid (EDTA). © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
Co-reporter:Weili Hu, Shiyan Chen, Bihui Zhou, Huaping Wang
Materials Science and Engineering: B 2010 170(1–3) pp: 88-92
Publication Date(Web):15 June 2010
DOI:10.1016/j.mseb.2010.02.034
ZnO nanoparticles with a pure wurtzite structure have been successfully synthesized through decomposing bacterial cellulose infiltrated with zinc acetate aqueous solution at high temperature. The effects of the concentration of zinc acetate aqueous solution, the calcination temperature, and the templates on the average particle size and morphology of the ZnO nanoparticles were investigated. The prepared ZnO nanoparticles were characterized by FESEM, XRD, FTIR and TG–DTA. The results suggest that bacterial cellulose plays an important role in preventing the ZnO nanoparticles from aggregating under optimized conditions. The calcination temperature has great effects on the morphologies of ZnO nanoparticles. When calcinating at 600 °C and using BC as the template with 1 wt.% zinc acetate aqueous solution, well-dispersed and regular ZnO nanoparticles with a narrow size distribution of 20–50 nm and high photocatalytic activity were obtained.
Co-reporter:Xin Li, Shiyan Chen, Weili Hu, Shuaike Shi, Wei Shen, Xiang Zhang, Huaping Wang
Carbohydrate Polymers 2009 Volume 76(Issue 4) pp:509-512
Publication Date(Web):16 May 2009
DOI:10.1016/j.carbpol.2008.11.014
CdS nanoparticles have been synthesized and stabilized on unique bacterial cellulose (BC) nanofibers in situ. The obtained nanocomposite material have been characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), fourier transformed infrared (FTIR), thermogravimetric analysis (TGA), ultraviolet–visible (UV–Vis) and photoluminescence (PL) spectroscopy. The results indicated that CdS nanoparticles of about 30 nm diameter deposited on BC nanofibres are well-dispersed in the BC nanofibre-network and the uniform spherical CdS nanoparticles are comprised of nano-sized CdS crystal. Moreover, the crystallite sizes of CdS crystals are about 8 nm. The nanocomposites would have potential application as photocatalyst, novel luminescence and photoelectron transfer devices.
Co-reporter:Yan Chen, Shiyan Chen, Baoxiu Wang, Jingjing Yao, Huaping Wang
Carbohydrate Polymers (15 March 2017) Volume 160() pp:
Publication Date(Web):15 March 2017
DOI:10.1016/j.carbpol.2016.12.020
•A novel nanohybrid was successfully fabricated by deposition of AuNPs onto TOBCNs.•The size and amount of AuNPs can be affected by TOBCNs concentration and pH value.•AuNPs/TOBCNs nanohybrids exhibited superior catalytic properties.A novel nanohybrid was successfully fabricated by deposition of gold nanoparticles (AuNPs) onto the surface of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized bacterial cellulose nanofibers (TOBCNs). The prepared AuNPs/TOBCNs nanohybrids were characterized by UV–vis spectral analysis, XRD, TEM and HRTEM. Their catalytic activity for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) was estimated by UV–vis spectrometry. The results showed that the AuNPs/TOBCNs nanohybrids possessed AuNPs with an average diameter of 4.30 ± 0.97 nm exhibited superior catalytic properties for the reduction of 4-NP to 4-AP. The influences of the content of reducing agent and system temperature on the catalytic property were studied. Moreover, the turnover frequency of AuNPs/TOBCNs was 750 h−1, which is higher than most recently reported AuNPs-based catalysts. This work reported a heterogeneous catalyst based on TOBCNs supported AuNPs with superior catalytic properties.
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