Co-reporter:Fanyu Zhang, Xinxin Sang, Xiuniang Tan, Chengcheng Liu, Jianling Zhang, Tian Luo, Lifei Liu, Buxing Han, Guanying Yang, and Bernard P. Binks
Langmuir October 31, 2017 Volume 33(Issue 43) pp:12427-12427
Publication Date(Web):September 30, 2017
DOI:10.1021/acs.langmuir.7b02365
Here, we propose to modify the hydrophilicity of metal–organic framework (MOF) particles by an interfacial assembling route, which is based on the surface-active nature of MOF particles. It was found that hydrophilic UiO-66-NH2 particles can be converted to hydrophobic particles through an oil–water interfacial assembling route. The underlying mechanism for the conversion of UiO-66-NH2 was investigated by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. It was revealed that the close assembly of UiO-66-NH2 particles at the oil–water interface strengthens the coordination between organic ligands and metal ions, which results in a decrease in the proportion of hydrophilic groups on UiO-66-NH2 particle surfaces. Hydrophobic UiO-66-NH2 particles show improved adsorption capacity for dyes in organic solvents compared with pristine UiO-66-NH2 particles. It is expected that the interfacial assembling route can be applied to the synthesis of different kinds of MOF materials with tunable hydrophilicity or hydrophobicity required for diverse applications.
Co-reporter:Chengcheng Liu, Jianling Zhang, Xinxin Sang, Xinchen Kang, Bingxing Zhang, Tian Luo, Xiuniang Tan, Buxing Han, Lirong Zheng, and Jing Zhang
ACS Applied Materials & Interfaces May 24, 2017 Volume 9(Issue 20) pp:17613-17613
Publication Date(Web):May 4, 2017
DOI:10.1021/acsami.7b02546
Using functional materials to stabilize emulsions of carbon dioxide (CO2) and water is a promising way to expand the utility of CO2 and functional materials. Here we demonstrate for the first time that the partially reduced graphene oxide (rGO) can well stabilize the emulsion of CO2 and water without the aid of any additional emulsifier or surface modification for rGO. More interestingly, such a novel kind of emulsion provides a facile and versatile route for constructing highly porous three-dimensional rGO materials, including rGO, metal/rGO, and metal oxide/rGO networks. The as-synthesized Au/rGO composite is highly active in catalyzing 4-nitrophenol reduction and styrene epoxidation.Keywords: catalysis; CO2; emulsion; graphene oxide; water;
Co-reporter:Lifei Liu;Fanyu Zhang;Xiuniang Tan;Bingxing Zhang;Jinbiao Shi;Dan Shao;Dongxing Tan;Buxing Han;Guanying Yang
Soft Matter (2005-Present) 2017 vol. 13(Issue 48) pp:9174-9178
Publication Date(Web):2017/12/13
DOI:10.1039/C7SM02007D
Herein we propose an interfacial assembly and hydrolysis route for fabricating TiO2/UiO-67 composites. The UiO-67 assembles at the water–oil interface serving as a stabilizer of the emulsion. TiO2 nanoparticles are loaded on UiO-67 by hydrolysis of the precursor TBT (tetra-n-butyl titanate) at the water–oil interface. By such a strategy, hollow capsules structured by UiO-67 and decorated by ultra-small TiO2 nanoparticles were produced. The newly-constructed composite combines the CO2 adsorption properties of UiO-67 and the photocatalytic activity of TiO2, showing high activity for the photocatalytic reduction of CO2 to formic acid. Such a composite with a novel structure provides a promising route for the preparation of new compound materials.
Co-reporter:Fanyu Zhang;Lifei Liu;Xiuniang Tan;Xinxin Sang;Chengcheng Liu;Bingxing Zhang;Buxing Han;Guanying Yang
Soft Matter (2005-Present) 2017 vol. 13(Issue 40) pp:7365-7370
Publication Date(Web):2017/10/18
DOI:10.1039/C7SM01567D
Herein we demonstrate the formation of a novel kind of Pickering emulsion that is stabilized by a Zr-based metal–organic framework (Zr-MOF) and graphene oxide (GO). It was found that the Zr-BDC-NO2 and GO solids assembling at the oil/water interface can effectively stabilize the oil droplets that are dispersed in the water phase. Such a Pickering emulsion offers a facile route for fabricating Zr-MOF/GO composite materials. After removing water and oil by freeze drying from Pickering emulsions, the Zr-MOF/GO composites were obtained and their morphologies, structures and interaction properties were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectrometry, respectively. The influences of the concentration of GO and Zr-MOF on the emulsion microstructures and the properties of the MOF/GO composites were studied. Based on experimental results, the mechanisms for the emulsion formation by Zr-MOF and GO and the as-synthesized superstructures of the Zr-MOF/GO composite were proposed. It is expected that this facile and tunable route can be applied to the synthesis of different kinds of MOF-based or GO-based composite materials.
Co-reporter:Shuai Liu, Xinxin Sang, Lihua Wang, Jianling Zhang, Jinliang Song, Buxing Han
Electrochimica Acta 2017 Volume 257(Volume 257) pp:
Publication Date(Web):10 December 2017
DOI:10.1016/j.electacta.2017.10.084
•Metal-organic framework is utilized for vanadium flow battery.•UiO-66 provide 0.55 nm ion channels and easy passage for the smaller proton.•Vanadium crossover is decreased due to size exclusion effect.•UiO-66 are functionalized to analyze the effect of functional groups.The metal-organic framework (MOF) is utilized as functional additive in non-perfluorinated polymer membrane for vanadium flow battery (VFB) application for the first time. The UiO-66 series can be easily modified to form suitable pore size distribution and are robust toward aqueous and acidic conditions. Owing to the different stokes radius of protons and vanadium ions, the additive micoporous UiO-66 series increase membranes’ proton selectivity effectively. Outstandingly, the VFBs with MOF-loaded polymer membranes exhibit higher coulombic efficiency and energy efficiency than those using neat polymer membrane and the perfluorinated Nafion 115 membrane at the same conditions. Moreover, the blend membranes present ultra-long self-discharge time up to 200 h and stable performance for 100 charge-discharge cycles without significant decline in energy efficiency. The MOF-loaded polymer membranes are promising for VFB applications due to the high efficiency, excellent stability, low cost and easy designation and functionality.Download high-res image (131KB)Download full-size image
Co-reporter:Xiuniang Tan, Jianling Zhang, Tian Luo, Xinxin Sang, Chengcheng Liu, Bingxing Zhang, Li Peng, Wei Li and Buxing Han
Soft Matter 2016 vol. 12(Issue 24) pp:5297-5303
Publication Date(Web):17 May 2016
DOI:10.1039/C6SM00924G
The aggregation behavior of the ionic liquid (IL) 1-alkyl-3-methylimidazolium chloride with different alkyl chain lengths in a deep eutectic solvent (DES, composed of choline chloride and glycerol in a 1:2 mole ratio) was studied for the first time. The critical micellar concentration, micellar size and intermolecular interactions in IL/DES solutions were investigated by different techniques including the fluorescence probe technique, small angle X-ray scattering and Fourier transform infrared spectroscopy. The solvophobic effect dominates the micellization of CnmimCl in DES and the intermolecular hydrogen-bond interaction plays a positive role to promote micelle formation. The micellar solutions were utilized for the synthesis of the water-unstable metal–organic framework Cu3(BTC)2 (BTC = 1,3,5-benzenetricarboxylate) at room temperature. X-Ray diffraction, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption–desorption isotherms confirm the formation of crystalline Cu3(BTC)2 nanocrystals with mesoporous structures. The morphologies and porosity properties of Cu3(BTC)2 nanocrystals can be modulated by varying the concentration of CnmimCl.
Co-reporter:Li Peng, Jianling Zhang, Shuliang Yang, Buxing Han, Xinxin Sang, Chengcheng Liu and Guanying Yang
Green Chemistry 2015 vol. 17(Issue 8) pp:4178-4182
Publication Date(Web):08 Jul 2015
DOI:10.1039/C5GC01333J
Here we demonstrate the utilization of the ionic liquid (IL) microphase for enhancing the catalytic activities of the metal nanoparticles supported on a MOF. The IL microphase offers an excellent environment for stabilizing metal nanoparticles. A new heterogeneous catalyst Pd/IL/MOF is developed, which combines the advantages of highly dispersed small Pd nanoparticles, the IL microphase and a porous MOF. The as-synthesized Pd/IL/MOF catalysts have shown high catalytic activity and reusability for selective hydrogenation under mild conditions.
Co-reporter:Chengcheng Liu, Bingxing Zhang, Jianling Zhang, Li Peng, Xinchen Kang, Buxing Han, Tianbin Wu, Xinxin Sang and Xue Ma
Chemical Communications 2015 vol. 51(Issue 57) pp:11445-11448
Publication Date(Web):04 Jun 2015
DOI:10.1039/C5CC02503F
Herein it was found that gas can be utilized as an activator to promote metal–organic framework (MOF) crystallization in IL at room temperature. The ultra-small MOF nanoparticles were obtained, and their size and porosity properties can be easily modulated by controlling gas pressure. The as-synthesized nano-sized Cu-MOF is an excellent candidate catalyst for the solvent-free oxidation of cyclohexene with oxygen.
Co-reporter:Li Peng, Jianling Zhang, Shuliang Yang, Buxing Han, Xinxin Sang, Chengcheng Liu, Xue Ma and Guanying Yang
Chemical Communications 2015 vol. 51(Issue 21) pp:4398-4401
Publication Date(Web):04 Feb 2015
DOI:10.1039/C4CC09131K
Here we demonstrate the in situ formation of ultra-small gold nanoparticles (<2 nm) finely dispersed on a binary solid carrier, i.e. a mesoporous SiO2 coated graphene oxide (GO) nanosheet. The as-synthesized Au–SiO2–GO composite has shown high catalytic activity and reusability for chemical reactions under mild conditions.
Co-reporter:Xinxin Sang, Jianling Zhang, Tianbin Wu, Bingxing Zhang, Xue Ma, Li Peng, Buxing Han, Xinchen Kang, Chengcheng Liu and Guanying Yang
RSC Advances 2015 vol. 5(Issue 82) pp:67168-67174
Publication Date(Web):30 Jul 2015
DOI:10.1039/C5RA12808K
CuO nanoleaves with a mesoporous structure were formed in an aqueous solution of triethylamine at room temperature. The growth process of the CuO nanoleaves in a triethylamine solution was investigated by varying the reaction time. It is shown that the CuO nanostructures form by reconstructive transformation from Cu(OH)2, going through a 0D nanoparticle → 1D nanowire → 2D nanoleaf dimensional transition process. The mechanism for the amine-induced formation of CuO at room temperature was studied by using different aliphatic amines. It is revealed that the amines play multiple roles on CuO formation, i.e. acting as an alkali, dominating the Cu(OH)2 to CuO transformation, and directing the oriented crystal growth of CuO. This route is simple, rapid, involves no additional alkalis or directing agents, and can proceed at room temperature. The as synthesized CuO exhibits excellent catalytic activity for cyclohexene oxidation with oxygen under solvent-free conditions.
Co-reporter:Bingxing Zhang, Jianling Zhang, Chengcheng Liu, Xinxin Sang, Li Peng, Xue Ma, Tianbin Wu, Buxing Han and Guanying Yang
RSC Advances 2015 vol. 5(Issue 47) pp:37691-37696
Publication Date(Web):08 Apr 2015
DOI:10.1039/C5RA02440D
The formation of a water-sensitive metal–organic framework (MOF), Cu3(BTC)2 (BTC = 1,3,5-benzenetricarboxylate), in a water/ethanol solvent system was studied systematically. The X-ray diffraction results prove that the MOF cannot form in pure water or in a water/ethanol mixture with a small amount of ethanol. As the ethanol content exceeds 30 vol%, a crystalline MOF can be obtained. The scanning electron microscope images of the as-synthesized MOFs show the formation of MOF nanoparticles with an average size of 20–300 nm. The MOF particle size decreased with increasing ethanol content in the mixed solvent. The FT-IR spectra further support that the MOF formation occurs in water/ethanol mixtures with ethanol volume ratios higher than 30 vol%. Thermogravimetric analysis showed that the MOF is stable up to 300 °C. Moreover, the FT-IR spectra and thermogravimetric analysis gave consistent information on the solvent amount entrapped in the MOF pores. The porosity of the MOFs was determined using a N2 adsorption–desorption method. When the ethanol volume ratio reached 75%, the largest SBET value of 1067 m2 g−1 and Vt value of 0.52 cm3 g−1 were obtained. The possible mechanism for MOF formation in water/ethanol solvent systems and the dependence of the MOF size on the solvent composition was discussed from the view of hydrogen bond strength between solvent molecules and the ligands in different water/ethanol solvent systems.
Co-reporter:Chengcheng Liu, Jianling Zhang, Li Peng, Xinchen Kang, Buxing Han, Xinxin Sang, Xue Ma, Guanying Yang
Microporous and Mesoporous Materials 2015 Volume 217() pp:6-11
Publication Date(Web):15 November 2015
DOI:10.1016/j.micromeso.2015.05.046
•The macro- and mesoporous assemblies of Co3O4 nanoparticles were produced.•The porosity properties and nanoparticle size of Co3O4 are tunable.•The Co3O4 is excellent catalyst for the photocatalytic reaction of MB degradation.The hierarchical porous metal oxide combines the advantages of each class of hierarchical pores and has potential applications in different fields. Here we proposed an emulsion-calcination route for producing porous metal oxide. The porous metal-organic complex was first synthesized in CO2-in-water emulsion, then the metal-organic complex was calcined to remove the organic linker and form porous metal oxide. The hierarchical macro- and mesoporous assemblies of Co3O4 nanoparticles were produced. The hierarchical macro- and mesoporous assemblies of Co3O4 nanoparticles were produced, with the macropores in size of hundreds of nanometers and the mesopores in 9–15 nm. The porosity properties and nanoparticle size of Co3O4 can be modulated by controlling CO2 pressure. The as-synthesized Co3O4 is an excellent candidate catalyst for the methylene blue degradation. By taking advantages of the high porosity and small particle size, the Co3O4 have potential applications in catalysis, gas separation, and controlled drug release. The strategy proposed in this work can be applied to the synthesis of different kinds of porous metal oxides.
Co-reporter:Xinxin Sang; Jianling Zhang;Li Peng;Chengcheng Liu;Xue Ma; Buxing Han ;Guanying Yang
ChemPhysChem 2015 Volume 16( Issue 11) pp:2317-2321
Publication Date(Web):
DOI:10.1002/cphc.201500209
Abstract
We propose a facile room-temperature synthesis of a metal–organic framework (MOF) with a bimodal mesoporous structure (3.9 and 17-28 nm) in an ionic liquid (IL)/ethylene glycol (EG) mixture. The X-ray diffraction analysis reveals that MOF formation can be efficiently promoted by the presence of the EG/IL interface at room temperature. The MOFs with mesoporous networks are characterized by SEM and TEM. The formation mechanism of the mesoporous MOF in EG/IL mixture is investigated. It is proposed that the EG nanodroplets in the IL work as templates for the formation of the large mesopores. The as-synthesized mesoporous metal–organic framework is an effective and reusable heterogeneous catalyst to catalyze the aerobic oxidation of benzylic alcohols.
Co-reporter:Li Peng, Jianling Zhang, Shuliang Yang, Buxing Han, Xinxin Sang, Chengcheng Liu and Guanying Yang
Chemical Communications 2014 vol. 50(Issue 80) pp:11957-11960
Publication Date(Web):19 Aug 2014
DOI:10.1039/C4CC05138F
Mesoporous polymers with tunable large mesopores and thin mesopore walls were synthesized through a CO2-swollen micelle templating route. The mesopore size and porosity properties of the polymers can be easily modulated by adjusting CO2 pressure. The as-synthesized mesocellular polymers are excellent candidate supports for preparing heterogeneous catalysts.
Co-reporter:Chengcheng Liu, Qingqing Mei, Jianling Zhang, Xinchen Kang, Li Peng, Buxing Han, Zhimin Xue, Xinxin Sang, Xiaogan Yang, Zhonghua Wu, Zhihong Li and Guang Mo
Chemical Communications 2014 vol. 50(Issue 91) pp:14233-14236
Publication Date(Web):24 Sep 2014
DOI:10.1039/C4CC06623E
It was found that CO2 could induce the gelation of Pluronic aqueous solutions, during which the microstructure of the solution transforms from randomly dispersed spherical micelles to cubic close packed micelles. The gelation switched by compressed CO2 has many advantages and can be applied in the synthesis of porous materials.
Co-reporter:Xinxin Sang, Li Peng, Jianling Zhang, Buxing Han, Zhimin Xue, Chengcheng Liu and Guanying Yang
Chemical Communications 2014 vol. 50(Issue 60) pp:8128-8130
Publication Date(Web):30 Apr 2014
DOI:10.1039/C4CC02191F
Mesoporous polyacrylamides (PAMs) with tunable porosities were synthesized in 1-alkyl-3-methylimidazolium tetrafluoroborates ([Cnmim][BF4], n = 4, 6, 8, 10). The as-synthesized PAM was used as a support for Pd nanoparticles and the Pd/PAM composite showed high catalytic activity and selectivity for the hydrogenation of p-chloronitrobenzene reaction to yield p-chloroaniline.
Co-reporter:Wei Li, Yanjuan Yang, Tian Luo, Jianling Zhang and Buxing Han
Physical Chemistry Chemical Physics 2014 vol. 16(Issue 8) pp:3640-3647
Publication Date(Web):18 Dec 2013
DOI:10.1039/C3CP54537G
Study of micelle to vesicle transition (MVT) is of great importance from both theoretical and practical points of view. In this work, we studied the effect of compressed CO2 on the aggregation behavior of zwitterionic–anionic (DSB (dodecyl sulfonatebetaine)–AOT(sodium bis(2-ethylhexyl) sulfosuccinate)) mixed surfactants in aqueous solution by means of direct observation, turbidity, steady-state fluorescence, fluorescence quantum yield, and entrapment quantity of vesicles. Interestingly, all the methods show that compressed CO2 can induce MVT in this zwitterionic–anionic surfactant system. The CO2-induced MVT is reversible and the degree of MVT can be easily tuned by controlling the operation pressure. Further studies show that the pH decrease and dissolution of gas molecules in the surfactant film co-contribute to the MVT, and a possible mechanism for the CO2-induced MVT was proposed based on the experimental results.
Co-reporter:Jianling Zhang, Li Peng and Buxing Han
Soft Matter 2014 vol. 10(Issue 32) pp:5861-5868
Publication Date(Web):11 Jun 2014
DOI:10.1039/C4SM00890A
Supercritical (sc) CO2 and ionic liquids (ILs) are very attractive green solvents with tunable properties. Using scCO2 and ILs as alternatives of conventional solvents (water and oil) for forming amphiphile self-assemblies has many advantages. For example, the properties and structures of the amphiphile self-assemblies in these solvents can be easily modulated by tuning the properties of solvents; scCO2 has excellent solvation power and mass-transfer characteristics; ILs can dissolve both organic and inorganic substances and their properties are designable to satisfy the requirements of various applications. Therefore, the amphiphile self-assemblies in scCO2 and ILs have attracted considerable attention in recent years. This review describes the advances of using scCO2 or/and ILs as amphiphile self-assembly media in the last decade. The amphiphile self-assemblies in scCO2 and ILs are first reviewed, followed by the discussion on combination of scCO2 and ILs in creating microemulsions or emulsions. Some future directions on the amphiphile self-assemblies in scCO2 and ILs are highlighted.
Co-reporter:Zhimin Xue; Jianling Zhang;Li Peng; Buxing Han;Dr. Tiancheng Mu;Dr. Jianshen Li;Guanying Yang
ChemPhysChem 2014 Volume 15( Issue 1) pp:85-89
Publication Date(Web):
DOI:10.1002/cphc.201300809
Co-reporter:Li Peng, Jianling Zhang, Zhimin Xue, Buxing Han, Jianshen Li and Guanying Yang
Chemical Communications 2013 vol. 49(Issue 99) pp:11695-11697
Publication Date(Web):23 Oct 2013
DOI:10.1039/C3CC46853D
The large-pore mesoporous Mn3O4 crystals with tunable morphologies, size and porosities were synthesized via the conversion of metal–organic frameworks, which were fabricated by utilizing the nanostructural organizations of ionic liquid–water mixtures as templates. Mn3O4 showed high catalytic activity for the degradation of methyl blue in the wastewater treatment.
Co-reporter:Long Qin;Dr. Li Zhang;Dr. Qingxian Jin; Jianling Zhang; Buxing Han ; Minghua Liu
Angewandte Chemie International Edition 2013 Volume 52( Issue 30) pp:
Publication Date(Web):
DOI:10.1002/anie.201302662
Co-reporter:Li Peng; Jianling Zhang;Jianshen Li; Buxing Han;Zhimin Xue ;Guanying Yang
Angewandte Chemie 2013 Volume 125( Issue 6) pp:1836-1839
Publication Date(Web):
DOI:10.1002/ange.201209255
Co-reporter:Li Peng; Jianling Zhang;Jianshen Li; Buxing Han;Zhimin Xue ;Guanying Yang
Angewandte Chemie International Edition 2013 Volume 52( Issue 6) pp:1792-1795
Publication Date(Web):
DOI:10.1002/anie.201209255
Co-reporter:Jianshen Li, Jianling Zhang, Yueju Zhao, Buxing Han and Guanying Yang
Chemical Communications 2012 vol. 48(Issue 7) pp:994-996
Publication Date(Web):05 Dec 2011
DOI:10.1039/C2CC15922H
High-internal-ionic liquid-phase emulsions were formed for the first time. The novel emulsions are very stable and do not involve any volatile organic solvent. They have great potential of applications in different fields, such as material synthesis, extraction, encapsulation, and chemical reactions.
Co-reporter:Li Peng, Jianling Zhang, Jianshen Li, Buxing Han, Zhimin Xue and Guanying Yang
Chemical Communications 2012 vol. 48(Issue 69) pp:8688-8690
Publication Date(Web):12 Jul 2012
DOI:10.1039/C2CC34416E
Mesoporous MOF nanoplates were formed in surfactant–IL solutions. This method is simple, requires less energy, and is environmental friendly, and can be easily applied to the synthesis of other MOFs with different morphologies and porosities.
Co-reporter:Jianshen Li, Jianling Zhang, Buxing Han, Li Peng and Guanying Yang
Chemical Communications 2012 vol. 48(Issue 85) pp:10562-10564
Publication Date(Web):10 Sep 2012
DOI:10.1039/C2CC36089F
A new type of nanoemulsion formed by two immiscible ionic liquids was prepared for the first time. This novel kind of emulsion involves no volatile organic solvent. Metal–organic framework nanorods with large mesopores were synthesized in the nanoemulsion.
Co-reporter:Zhimin Xue; Jianling Zhang;Li Peng;Jianshen Li;Dr. Tiancheng Mu; Buxing Han;Guanying Yang
Angewandte Chemie 2012 Volume 124( Issue 49) pp:12491-12495
Publication Date(Web):
DOI:10.1002/ange.201206197
Co-reporter:Zhimin Xue; Jianling Zhang;Li Peng;Jianshen Li;Dr. Tiancheng Mu; Buxing Han;Guanying Yang
Angewandte Chemie International Edition 2012 Volume 51( Issue 49) pp:12325-12329
Publication Date(Web):
DOI:10.1002/anie.201206197
Co-reporter:Yueju Zhao, Jianling Zhang, Jinliang Song, Jianshen Li, Jinli Liu, Tianbin Wu, Peng Zhang and Buxing Han
Green Chemistry 2011 vol. 13(Issue 8) pp:2078-2082
Publication Date(Web):06 Jul 2011
DOI:10.1039/C1GC15340D
A simple and efficient route for the immobilization of noble metal nanoparticles onto metal–organic framework (MOF) has been designed in this work. The Ru/MOF nanocomposites were prepared using RuCl3·3H2O as a precursor in supercritical CO2-methanol solution at 200 °C. The as-synthesized Ru/MOF composite presented a high catalytic performance for the hydrogenation of cyclohexene and benzene. There was almost no activity loss after the catalyst was reused five times. The intermolecular interactions between the MOF and Ru nanoparticles were investigated by X-ray photoelectron spectra and FT-IR spectra. It was shown that the carboxylate groups of MOF were coordinated to Ru. The formation mechanism of the Ru/MOF nanocomposites in supercritical CO2-methanol solution through an inorganic reaction route was discussed. This method can be easily applied to the synthesis of other MOF-supported metal nanoparticles.
Co-reporter:Jianling Zhang, Jianshen Li, Yueju Zhao, Buxing Han, Minqiang Hou and Guanying Yang
Chemical Communications 2011 vol. 47(Issue 20) pp:5816-5818
Publication Date(Web):12 Apr 2011
DOI:10.1039/C0CC05768A
CO2 can be used to separate surfactant and organic solvent completely in various surfactant/solvent solutions without contaminating the surfactants and solvents. We believe that the simple, efficient, and greener method has wide applications.
Co-reporter:Jianling Zhang, Buxing Han, Yueju Zhao, Jianshen Li, Minqiang Hou and Guanying Yang
Chemical Communications 2011 vol. 47(Issue 3) pp:1033-1035
Publication Date(Web):12 Nov 2010
DOI:10.1039/C0CC02449J
Here we found that CO2 has high solubility in low-cost hydrocarbon surfactant liquids.
Co-reporter:Jianling Zhang, Buxing Han, Yueju Zhao, Wei Li and Yuanhui Liu
Physical Chemistry Chemical Physics 2011 vol. 13(Issue 13) pp:6065-6070
Publication Date(Web):21 Feb 2011
DOI:10.1039/C0CP02870C
Herein it was found that CO2 could trigger an O/W to W/O emulsion inversion via a W/O/W nanoemulsion. In comparison with the conventionally used liquid or solid additives, the unusual advantage of this method is that the emulsion morphologies can be switched reversibly by the control of CO2 pressure. Besides, CO2 can be easily removed by depressurization and thus no extra separation process is needed, and CO2 can be recycled. Furthermore, other lipophilic gases of ethylene, propylene and isobutane can also induce the O/W to W/O emulsion inversion. A possible mechanism for the gas-triggered emulsion inversion was proposed.
Co-reporter:Yueju Zhao, Jianling Zhang, Qian Wang, Jianshen Li and Buxing Han
Physical Chemistry Chemical Physics 2011 vol. 13(Issue 2) pp:684-689
Publication Date(Web):29 Oct 2010
DOI:10.1039/C0CP00869A
The cetyltrimethylammonium bromide (CTAB)/water/heptane emulsion system with different CO2 pressure has been studied. The phase behavior investigation shows the nanoemulsion can be formed at suitable pressure range. The generalized indirect Fourier transformation (GIFT) analysis of the small-angle X-ray scattering (SAXS) data has drawn a clear picture of the structural information of the nanoemulsion, which reveals that the droplet of emulsion has a double structure with both the outer and inner droplet size in nanometre range. Furthermore, the investigation of the heptane/CTAB/water/CO2 emulsion system by using electrical conductivity confirms the emulsion type transforms from O/W to W/O/W. In addition, the effect of different CTAB concentration on the nanoemulsion formation has been studied. It is found that enough CTAB concentration is necessary for the inclusion of continuous water into oil droplets. We also explored the application of the W/O/W double nanoemulsion in material synthesis. Interestingly, the hollow silica spheres with double shells were obtained in this CO2-induced double nanoemulsion.
Co-reporter:Wei Li, Jianling Zhang, Buxing Han and Yueju Zhao
RSC Advances 2011 vol. 1(Issue 5) pp:776-781
Publication Date(Web):24 Aug 2011
DOI:10.1039/C1RA00237F
Herein we investigated the effects of six hydrocarbon gases (methane, ethane, propane, ethylene, propylene and isobutene) on mixed cationic–anionic surfactant solutions by phase behavior observation, turbidity, conductivity, and fluorescence spectra. It was found that all these gases could enhance the stability of vesicles formed in the mixed surfactant solutions. The pressure for the stable vesicle formation is decreased with the increasing gas molecular chain length. The possible mechanism for the enhanced vesicle stability by compressed gases was discussed.
Co-reporter:Yueju Zhao;Dr. Jianling Zhang; Buxing Han;Dr. Jinliang Song;Jianshen Li ;Qian Wang
Angewandte Chemie International Edition 2011 Volume 50( Issue 3) pp:636-639
Publication Date(Web):
DOI:10.1002/anie.201005314
Co-reporter:Dr. Jianling Zhang; Buxing Han;Jianshen Li;Dr. Yueju Zhao ;Guanying Yang
Angewandte Chemie 2011 Volume 123( Issue 42) pp:10085-10089
Publication Date(Web):
DOI:10.1002/ange.201103956
Co-reporter:Dr. Jianling Zhang; Buxing Han;Yueju Zhao;Jianshen Li ;Guanying Yang
Chemistry - A European Journal 2011 Volume 17( Issue 15) pp:4266-4272
Publication Date(Web):
DOI:10.1002/chem.201002153
Abstract
The micellization of amphiphilic molecules is an interesting topic from both theoretical and practical points of view. Herein we have studied the effects of compressed CO2 on the micellization of Pluronics in water by means of fluorescence, UV/Vis spectra, and small-angle X-ray scattering. It was found that CO2 can induce the micellization of Pluronics in water, and the micelle can return to the initial state of molecular dispersion after depressurization. Therefore, the micellization of Pluronics in water can be switched through the easy control of pressure. Different from the common micelles with hydrophobic cores, interestingly, this CO2-induced micelle has an amphiphilic core, in which hydrophobic and hydrophilic domains coexist. On account of the ability to dissolve both polar and nonpolar components in the micellar core, the CO2-induced micelles can improve the reagent compatibilities frequently encountered in various applications. In an attempt to address this advantage, this micelle was utilized as template to the one-step synthesis of Au/silica core–shell composite nanoparticles. Furthermore, the underlying mechanism for the CO2-induced micellization of Pluronics in water was investigated by a series of experiments.
Co-reporter:Dr. Jianling Zhang; Buxing Han;Jianshen Li;Dr. Yueju Zhao ;Guanying Yang
Angewandte Chemie International Edition 2011 Volume 50( Issue 42) pp:9911-9915
Publication Date(Web):
DOI:10.1002/anie.201103956
Co-reporter:Yueju Zhao;Dr. Jianling Zhang; Buxing Han;Dr. Jinliang Song;Jianshen Li ;Qian Wang
Angewandte Chemie 2011 Volume 123( Issue 3) pp:662-665
Publication Date(Web):
DOI:10.1002/ange.201005314
Co-reporter:Yueju Zhao, Jianling Zhang, Buxing Han, Suqin Hu and Wei Li
Green Chemistry 2010 vol. 12(Issue 3) pp:452-457
Publication Date(Web):13 Jan 2010
DOI:10.1039/B921538G
The epoxidation of styrene in the cetyltrimethylammonium bromide (CTAB)/H2O/heptane/styrene/H2O2 emulsion system was investigated in the presence of compressed CO2. It was found that by controlling the CO2 pressure, the emulsion droplets can be changed in a wide range from micron to nanometre size; accordingly, the conversion was enhanced significantly with the reduced droplet size. At 5.27 MPa, the conversion in the emulsion (with droplet size of 39.5 nm) could be about 10 times higher than that in a surfactant-free system at the same pressure. The effects of other experimental conditions of CTAB concentration, reaction time, styrene concentration, amounts of H2O2, and alkalinity on the efficiency of the epoxidation were also studied, and a possible mechanism for the enhanced reaction efficiency with reduced droplet size was presented. This process has some unique advantages. For example, the reactant conversion can be easily tuned by controlling the pressure of CO2; CO2 can be used as bicarbonate source and no additional catalyst was used; CO2 can be easily removed by depressurization; the separation for the product is simple. It is believed that the CO2-tuned emulsions can be easily applied to many other chemical reactions.
Co-reporter:Yueju Zhao, Jianling Zhang, Qian Wang, Wei Li, Jianshen Li, Buxing Han, Zhonghua Wu, Kunhao Zhang and Zhihong Li
Langmuir 2010 Volume 26(Issue 7) pp:4581-4585
Publication Date(Web):March 8, 2010
DOI:10.1021/la904917n
The effect of CO2 on the microstructure of l-α-phosphatidylcholine (lecithin) reverse micelles was studied. The small-angle X-ray scattering (SAXS) results show that CO2 could induce a cylindrical-to-spherical micellar shape transformation. Fourier transform infrared (FT-IR) and UV−vis techniques were also utilized to investigate intermolecular interactions and micropolarity in the reverse micelles at different CO2 pressures. The reduction of the degree of hydrogen bonding between surfactant headgroups and water with added CO2 was found to be the main reason for the micellar shape transformation. In the absence of CO2, the hydrogen bonding between water and P═O of lecithin forms a linking bridge in the interfacial layer. Therefore, the free movement of the polar head of lecithin is limited and the cylindrical reverse micelles are formed. Upon adding CO2 to the reverse micelles, the hydrogen bonds between lecithin and water in reverse micelles are destroyed, which is favorable to forming spherical micelles. Moreover, the CO2-combined reverse micelles were utilized in the synthesis of silica particles. Rodlike silica nanoparticles were obtained in the absence of CO2, and ellipsoidal and spherical mesoporous silica particles were formed in the presence of CO2. This method of tuning micellar shape has many advantages compared to traditional methods.
Co-reporter:Li Peng, Jianling Zhang, Shuliang Yang, Buxing Han, Xinxin Sang, Chengcheng Liu and Guanying Yang
Chemical Communications 2014 - vol. 50(Issue 80) pp:NaN11960-11960
Publication Date(Web):2014/08/19
DOI:10.1039/C4CC05138F
Mesoporous polymers with tunable large mesopores and thin mesopore walls were synthesized through a CO2-swollen micelle templating route. The mesopore size and porosity properties of the polymers can be easily modulated by adjusting CO2 pressure. The as-synthesized mesocellular polymers are excellent candidate supports for preparing heterogeneous catalysts.
Co-reporter:Li Peng, Jianling Zhang, Shuliang Yang, Buxing Han, Xinxin Sang, Chengcheng Liu, Xue Ma and Guanying Yang
Chemical Communications 2015 - vol. 51(Issue 21) pp:NaN4401-4401
Publication Date(Web):2015/02/04
DOI:10.1039/C4CC09131K
Here we demonstrate the in situ formation of ultra-small gold nanoparticles (<2 nm) finely dispersed on a binary solid carrier, i.e. a mesoporous SiO2 coated graphene oxide (GO) nanosheet. The as-synthesized Au–SiO2–GO composite has shown high catalytic activity and reusability for chemical reactions under mild conditions.
Co-reporter:Xinxin Sang, Li Peng, Jianling Zhang, Buxing Han, Zhimin Xue, Chengcheng Liu and Guanying Yang
Chemical Communications 2014 - vol. 50(Issue 60) pp:NaN8130-8130
Publication Date(Web):2014/04/30
DOI:10.1039/C4CC02191F
Mesoporous polyacrylamides (PAMs) with tunable porosities were synthesized in 1-alkyl-3-methylimidazolium tetrafluoroborates ([Cnmim][BF4], n = 4, 6, 8, 10). The as-synthesized PAM was used as a support for Pd nanoparticles and the Pd/PAM composite showed high catalytic activity and selectivity for the hydrogenation of p-chloronitrobenzene reaction to yield p-chloroaniline.
Co-reporter:Jianshen Li, Jianling Zhang, Buxing Han, Li Peng and Guanying Yang
Chemical Communications 2012 - vol. 48(Issue 85) pp:NaN10564-10564
Publication Date(Web):2012/09/10
DOI:10.1039/C2CC36089F
A new type of nanoemulsion formed by two immiscible ionic liquids was prepared for the first time. This novel kind of emulsion involves no volatile organic solvent. Metal–organic framework nanorods with large mesopores were synthesized in the nanoemulsion.
Co-reporter:Li Peng, Jianling Zhang, Zhimin Xue, Buxing Han, Jianshen Li and Guanying Yang
Chemical Communications 2013 - vol. 49(Issue 99) pp:NaN11697-11697
Publication Date(Web):2013/10/23
DOI:10.1039/C3CC46853D
The large-pore mesoporous Mn3O4 crystals with tunable morphologies, size and porosities were synthesized via the conversion of metal–organic frameworks, which were fabricated by utilizing the nanostructural organizations of ionic liquid–water mixtures as templates. Mn3O4 showed high catalytic activity for the degradation of methyl blue in the wastewater treatment.
Co-reporter:Li Peng, Jianling Zhang, Jianshen Li, Buxing Han, Zhimin Xue and Guanying Yang
Chemical Communications 2012 - vol. 48(Issue 69) pp:NaN8690-8690
Publication Date(Web):2012/07/12
DOI:10.1039/C2CC34416E
Mesoporous MOF nanoplates were formed in surfactant–IL solutions. This method is simple, requires less energy, and is environmental friendly, and can be easily applied to the synthesis of other MOFs with different morphologies and porosities.
Co-reporter:Jianling Zhang, Jianshen Li, Yueju Zhao, Buxing Han, Minqiang Hou and Guanying Yang
Chemical Communications 2011 - vol. 47(Issue 20) pp:NaN5818-5818
Publication Date(Web):2011/04/12
DOI:10.1039/C0CC05768A
CO2 can be used to separate surfactant and organic solvent completely in various surfactant/solvent solutions without contaminating the surfactants and solvents. We believe that the simple, efficient, and greener method has wide applications.
Co-reporter:Jianling Zhang, Buxing Han, Yueju Zhao, Wei Li and Yuanhui Liu
Physical Chemistry Chemical Physics 2011 - vol. 13(Issue 13) pp:NaN6070-6070
Publication Date(Web):2011/02/21
DOI:10.1039/C0CP02870C
Herein it was found that CO2 could trigger an O/W to W/O emulsion inversion via a W/O/W nanoemulsion. In comparison with the conventionally used liquid or solid additives, the unusual advantage of this method is that the emulsion morphologies can be switched reversibly by the control of CO2 pressure. Besides, CO2 can be easily removed by depressurization and thus no extra separation process is needed, and CO2 can be recycled. Furthermore, other lipophilic gases of ethylene, propylene and isobutane can also induce the O/W to W/O emulsion inversion. A possible mechanism for the gas-triggered emulsion inversion was proposed.
Co-reporter:Jianling Zhang, Buxing Han, Yueju Zhao, Jianshen Li, Minqiang Hou and Guanying Yang
Chemical Communications 2011 - vol. 47(Issue 3) pp:NaN1035-1035
Publication Date(Web):2010/11/12
DOI:10.1039/C0CC02449J
Here we found that CO2 has high solubility in low-cost hydrocarbon surfactant liquids.
Co-reporter:Chengcheng Liu, Qingqing Mei, Jianling Zhang, Xinchen Kang, Li Peng, Buxing Han, Zhimin Xue, Xinxin Sang, Xiaogan Yang, Zhonghua Wu, Zhihong Li and Guang Mo
Chemical Communications 2014 - vol. 50(Issue 91) pp:NaN14236-14236
Publication Date(Web):2014/09/24
DOI:10.1039/C4CC06623E
It was found that CO2 could induce the gelation of Pluronic aqueous solutions, during which the microstructure of the solution transforms from randomly dispersed spherical micelles to cubic close packed micelles. The gelation switched by compressed CO2 has many advantages and can be applied in the synthesis of porous materials.
Co-reporter:Yueju Zhao, Jianling Zhang, Qian Wang, Jianshen Li and Buxing Han
Physical Chemistry Chemical Physics 2011 - vol. 13(Issue 2) pp:NaN689-689
Publication Date(Web):2010/10/29
DOI:10.1039/C0CP00869A
The cetyltrimethylammonium bromide (CTAB)/water/heptane emulsion system with different CO2 pressure has been studied. The phase behavior investigation shows the nanoemulsion can be formed at suitable pressure range. The generalized indirect Fourier transformation (GIFT) analysis of the small-angle X-ray scattering (SAXS) data has drawn a clear picture of the structural information of the nanoemulsion, which reveals that the droplet of emulsion has a double structure with both the outer and inner droplet size in nanometre range. Furthermore, the investigation of the heptane/CTAB/water/CO2 emulsion system by using electrical conductivity confirms the emulsion type transforms from O/W to W/O/W. In addition, the effect of different CTAB concentration on the nanoemulsion formation has been studied. It is found that enough CTAB concentration is necessary for the inclusion of continuous water into oil droplets. We also explored the application of the W/O/W double nanoemulsion in material synthesis. Interestingly, the hollow silica spheres with double shells were obtained in this CO2-induced double nanoemulsion.
Co-reporter:Wei Li, Yanjuan Yang, Tian Luo, Jianling Zhang and Buxing Han
Physical Chemistry Chemical Physics 2014 - vol. 16(Issue 8) pp:
Publication Date(Web):
DOI:10.1039/C3CP54537G
Co-reporter:Jianshen Li, Jianling Zhang, Yueju Zhao, Buxing Han and Guanying Yang
Chemical Communications 2012 - vol. 48(Issue 7) pp:NaN996-996
Publication Date(Web):2011/12/05
DOI:10.1039/C2CC15922H
High-internal-ionic liquid-phase emulsions were formed for the first time. The novel emulsions are very stable and do not involve any volatile organic solvent. They have great potential of applications in different fields, such as material synthesis, extraction, encapsulation, and chemical reactions.
Co-reporter:Chengcheng Liu, Bingxing Zhang, Jianling Zhang, Li Peng, Xinchen Kang, Buxing Han, Tianbin Wu, Xinxin Sang and Xue Ma
Chemical Communications 2015 - vol. 51(Issue 57) pp:NaN11448-11448
Publication Date(Web):2015/06/04
DOI:10.1039/C5CC02503F
Herein it was found that gas can be utilized as an activator to promote metal–organic framework (MOF) crystallization in IL at room temperature. The ultra-small MOF nanoparticles were obtained, and their size and porosity properties can be easily modulated by controlling gas pressure. The as-synthesized nano-sized Cu-MOF is an excellent candidate catalyst for the solvent-free oxidation of cyclohexene with oxygen.
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![Cyclohexanone, 2-[(R)-hydroxy(4-nitrophenyl)methyl]-, (2S)-rel-](/data/chemimg/664300/71444-30-9_b.png)
![Cyclohexanone, 2-[(R)-hydroxy(4-nitrophenyl)methyl]-, (2R)-rel-](/data/chemimg/664300/71444-29-6.png)
![Cyclohexanone, 2-[(R)-hydroxy(4-nitrophenyl)methyl]-, (2R)-rel-](/data/chemimg/664300/71444-29-6_b.png)
