ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Lijian Huang,Song Wei,Daocheng Pan
Large-grained Cu2ZnSn(S,Se)4 (CZTSSe) absorber layers are highly desirable for high-performance CZTSSe thin film solar cells. However, solution-deposited CZTSSe thin films usually consist of a large-grained top layer and a smaller-grained bottom layer. In this work, we adopt a phase-separation strategy to promote the crystal growth of the CZTSSe thin film. By choosing ZnCl2, SnCl2, CuCl (instead of CuCl2), and thiourea as the starting materials, a Cu2S/SnS/ZnS hybrid precursor thin film can be prepared, the composition of which has been testified by X-ray diffraction, X-ray photoelectron spectroscopy, Raman, and scanning electron microscopy-energy-dispersive spectrometry characterization. Owing to the volume expansion caused by Se incorporation and the high migration abilities of Cu(I) and Sn(II) ions during selenization, large-grained and compact CZTSSe films with a thickness up to 5 μm can be obtained. The corresponding thin film solar cell devices have achieved active power conversion efficiencies above 10% (8.78% for total area), much higher than those of CuCl2-based CZTSSe devices in our lab.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 39
·期 1
·639-649
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IF 3.159
Ying Wu,Kaiqiang Liu,Xiangli Chen,Yongping Chen,Shaofei Zhang,Junxia Peng,Yu Fang
A calix[4]arene-based dimeric-cholesteryl derivative with naphthalene in the linkers (C2N2C) was designed and synthesized. The gelation behaviors of the compound in 36 liquids were evaluated. It was demonstrated that C2N2C could gel 16 of the liquids tested, which include both polar and apolar liquids. SEM and AFM studies revealed that the morphologies of the gel networks are dependent on the concentrations of C2N2C and the nature of the liquids under study. Importantly, rheological studies revealed that the gel of the compound in benzene possesses sensitive, fast and fully reversible thixotropic property. More importantly, the Tgel of the C2N2C/benzene gel could be at least more than 60 degrees higher than the boiling point of benzene when the gelator concentration is greater than 6% (w/v), a result never reported before. CD measurements revealed the chiral nature of the assemblies of the gel networks. Further investigation by AFM measurements confirmed the right-hand helical structures of the gel networks of C2N2C/benzene gel. As anticipated, hydrogen bonding and π–π stacking are the two main driving forces for the formation of the gels.
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Soft Matter
·
2014
·Vol. 11
·期 2
·290-296
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IF 4.151
Shu Peng,Kui Wang,Dong-Sheng Guo,Yu Liu
Supramolecular polymeric vesicles are constructed by the complexation of p-sulfonatocalix[4]arene and chitosan, where the multivalent electrostatic interactions between the anionic sulfonate tetramer and cationic polyammoniums served as the dominant driving force. The supra-amphiphilic assemblies are disassembled upon exposure to a pH stimulus since the partial deprotonation of chitosan accompanied by a pH increase. Adding a competitive guest can also disrupt the assembly, representing the host–guest inclusion response. Interestingly, an abnormal temperature-response is observed, possibly as a result of the temperature-directed fusion process.
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高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Yao Shi,Xiao-Liang Zhang,Gang Feng,Xiangshu Chen,Zhang-Hui Lu
Ag–SiO 2 nanocomposites (NCs) with “plum-pudding” structure have been synthesized using a facile reverse micelle method. The as-synthesized Ag–SiO 2 NCs were calcined at 623 K to remove the surfactants and then characterized by XRD , FE-SEM, TEM, EDX, ICP and N 2 adsorption–desorption. The obtained results demonstrated that many ultrafine Ag nanoparticles (NPs) with size of ~2 nm are well dispersed in each SiO 2 nanosphere (28 nm). In comparison with free Ag NPs and SiO 2 supported Ag NPs, the Ag–SiO 2 NCs exhibited a better catalytic activity for the reduction of 4-nitrophenol with a turnover frequency of 489 h −1 at room temperature. Ag–SiO 2 NCs also displayed a superior catalytic activity for hydrogenation of 2-NP and 3-NP. The activation energy of Ag–SiO 2 NCs was estimated to be about 34.4 kJ mol −1 , which was lower than most of the reported values for the same reaction using Ag-based catalysts, indicating the superior catalytic performance of these plum-pudding structured catalysts.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2015
·Vol. 53
·期 8
·1023-1031
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IF 3.113
Hua-Feng Fei,Xiyin Gao,Xiaojie Han,Qian Wang,Tao Hu,Zhijie Zhang,Zemin Xie
Novel fluorine containing siloxane monomer, namely, 4-trifluoromethylphenylmethyl cyclosiloxane ( PF3 ) and mixed cyclosiloxane including both 4-trifluoromethylphenylmethyl siloxane ( P ) unit and trifluoropropyl siloxane ( F ) unit were successfully synthesized in this study. Furthermore, their series including vinyl-terminated copolymers with different compositions were synthesized. The microstructures of copolymers were investigated by 1 H NMR, 29 Si NMR, 19 F NMR, Fourier transform infrared spectroscopy, and differential scanning calorimetry (DSC). The results of characterizations confirmed that the copolymers exhibited random microstructure. Moreover, the analysis of the result of DSC also revealed that the copolymers had a low glass transition temperature. The thermogravimetric analysis indicated that poly(4-trifluoromethylphenylmethyl)siloxane ( PPF3 ) exhibited higher thermal stability than conventional fluorosilicones rubber ( FSR ). The dynamic mechanical analysis showed that the damping factors of these copolymers were greater than 0.3 in a wide range of temperature. The mass swelling ratios were less than 5.5% when the samples were immersed in No. 3 jet fuel for a month. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53 , 1023–1031
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RSC Advances
·
2015
·Vol. 5
·期 97
·79456-79462
·
IF 3.84
Zhuo Ma,Yunfeng Qiu,Yanmin Huang,Feng Gao,PingAn Hu
We report the eco-friendly chitosan assisted synthesis of 3D graphene@chitosan@Au nanosheet (3DG@CS@AuNSs) composites without using any toxic reductants or capping agents. The 3D graphene network consists of few-layer graphene sheets. One the one hand, the interfacial energy between graphene and Au nanostructures is significantly weakened due to the existence of chitosan polymers, serving as “glue” for anchoring Au nanosheets on the surface of 3D graphene. On the other hand, chitosan contains abundant hydroxyl and amine groups acting as reducing and stabilizing agents for the formation and even distribution of Au nanosheets. Mild redox reaction between hydrochloroauric ions and hydroxyl and amine groups occurred under thermal conditions due to the matching electrochemical potentials of the oxidants and reductants. The as-prepared 3DG@AuNSs exhibited much higher activities than that of 3DG@Au nanoaggregates towards the reduction of 4-nitrophenol, as well as more convenient recyclability than other supported Au NPs in terms of a robust free-standing foam structure. Furthermore, high performance liquid chromatography was also applied to monitor the emergence of 4-aminophenol during reaction. The present studies not only build a new route for the design of a robust and free-standing foam catalyst based on the integration of graphene and Au nanostructures by the assistance of a natural polymer, but also shed deep insight on the understanding of the synergistic catalytic activity towards nitrophenols.
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2015
·
IF 3.65
Li Qingcong,Pan Xiaoxia,Li Hongli,Yuan Minglong
A relatively high molecular weight of 4-arm star PELA was obtained by ring-opening polymerization of l -lactic acid O -carboxyanhydride with 4-arm-PEG in the presence of DMAP as an initiator. The results via 1 H NMR and 13 C NMR show that the end of the star PELA chain is a hydroxyl group and the central core is a PEG group. Rotavirus (strain SA11) was incorporated into 4-arm star PELA microspheres formulated by the water in oil in water emulsification solvent extraction method. The microspheres produced were spherical, and the mean diameter was 1.34 μm with a narrow size distribution. The drug release profile displayed a low burst release effect of 1.8% on the first day and a sustained release of antigen over 100 days. After the immunization of mice, the microsphere-entrapped RV elicited improved and long-lasting IgA and IgG antibody response in serum detected by ELISA in comparison to the free RV antigen. This study shows that 4-arm-PEG is an effective initiator for the ring-opening polymerization of Lac-OCA by DMAP as an initiator and that the resulting polymer is useful as a delivery system for the rotavirus vaccine .
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2014
·Vol. 302
·期 1
·575-581
·
IF 1.415
Dai Ying,Zhang Anyun
A new supermolecular recognition agent named tetra - tert -butyl-calix[4]-bis[(4-methly-1,2-phenylene-crown-6] ( Tert ButylCalixC) was synthesized. Batchwise experiments of extraction of Na(I), K(I), Rb(I), Cs(I), Sr(II), Ba(II), Ru(III) and Fe(III) from aqueous solution with Tert ButylCalixC/ o -nitroanisole were carried out. Effects of HNO 3 concentration, contact time and temperature on the extraction behavior were examined. The equilibrium established within 30 min implied a fast extraction kinetics. The optimal operation temperature was 298 K. Stoichiometry of Tert ButylCalixC and Cs(I) by electrospray ionization mass spectrometry characterization revealed 1:1 molar ratio. It was observed that the extraction system of Tert ButylCalixC/ o -nitroanisole was effective for selective removal of Cs(I), showing remarkable separation performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Peng Xu,Xuguang Liang,Nannan Chen,Jingen Tang,Wei Shao,Qinwei Gao,Zhaogang Teng
In the work, we have synthesized silver (Ag) nanoparticles deposited chitosan (CS) microcapsules with magnetic multiple Fe 3 O 4 cores (denoted as Fe 3 O 4 /CS-Ag) as efficient catalysts for the reduction of 4-nitrophenol. The Fe 3 O 4 /CS-Ag catalysts are prepared by coating hydrophobic Fe 3 O 4 nanoparticles with chitosan via a multiple emulsion-chemical crosslinking method and following in situ deposition of Ag nanoparticles onto the surfaces. The morphology and composition of the Fe 3 O 4 /CS-Ag microcapsules are characterized by Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy. Moreover, the catalytic activity of the Fe 3 O 4 /CS-Ag catalyst was investigated, which shows a conversion efficiency as high as 98% within 15 min for the reduction of p-nitrophenol to p-aminophenol. At the same time, the recovered Fe 3 O 4 /CS-Ag catalyst with an external magnet can retain good activity after 10 cycles. These results indicate that the multiple emulsion-chemical crosslinking method is an efficient and simple way for the preparation of magnetic separable chitosan microcapsules, and the fabricated Fe 3 O 4 /CS-Ag is a promising catalytic material with excellent catalytic activity and convenient recovery ability.
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高影响因子
CELLULOSE
·
2017
·Vol. 24
·期 12
·5505-5514
·
IF 3.417
Fei Ming-En,Xie Tianshun,Liu Wendi,Chen Han,Qiu Renhui
The present study focused on the surface treatment of bamboo fibers (BFs) with a bifunctional monomer, 1,2-epoxy-4-vinylcyclohexane (EVC), in the presence of N, N -dimethylbenzylamine as the catalyst, which results in the grafting of the fibers with C=C bonds on the surface. The modified BFs carrying C=C bonds were used to prepare bamboo fibers reinforced unsaturated polyester (UPE) composites by hand lay-up compression molding. Hence, chemical connections between the modified-fibers and UPE resins were formed via the free-radical polymerization of the C=C bonds during the preparation of the BFs–UPE composites. XPS analysis proved that the EVC was covalently bonded onto BFs. XRD analysis revealed that EVC-grafting did not alter the crystal structure of the fibers, but slightly decreased their crystallinity degrees. SEM images indicated an markedly improved interfacial adhesion between BFs and UPE matrices after fiber modification, which significantly increased the tensile strength, flexural strength, flexural modulus, storage modulus, glass transition temperature, and water resistance of the resulting BFs–UPE composites.
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RSC Advances
·
2017
·Vol. 7
·期 8
·4226-4236
·
IF 3.108
Youning Chen,Wei Zhao,Juncai Zhang
The study focused on the preparation of a chelating resin with pyridine ring as the functional group. The 4VP monomer was directly grafted on the surface of CMPS resin via SI-ATRP, and the performance of adsorption of resin for Cr(VI), Pb(II), Cr(III), Zn(II), and Cd(II) was determined. With the extension of ATRP time and increase of 4VP consumption, the 4VP grafting rate was linearly increased, indicating an increase in the density of the pyridine ring on the resin surface. Adsorption experiments indicated that the adsorption capacity of the resin for the metal ions considerably improved when compared with that of those reported in literature, whereas the desorption rate and reusability were equivalent to those of the conventional resins. When the pH value was greater than 5.0, Pb(II), Cr(III), Zn(II), and Cd(II) ions could be adsorbed; however, when the pH value was less than 3.0, Cr(VI) could be selectively adsorbed. These results are indicative of a potential application of the resin in the treatment of heavy metal wastewater. Therefore, adoption of one-step SI-ATRP is one of the effective methods for preparing a chelating resin with high capacity via the selection of an appropriate functional monomer.
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Journal of Energetic Materials
·
2017
·
IF 1.557
Xi Li,Qiu-han Lin,Xin-Ying Zhao,Zhi-Wei Han,Bo-liang Wang
Thermal techniques (differential scanning calorimetry (DSC) and the vacuum stability test (VST)), according to STANAG 4147, and non-thermal techniques (Fourier transform infrared (FTIR) spectrometry and X-ray diffractometry (XRD)) were used to examine compatibility issues for 2,4,6,8,10,12-hexanitrohexaazaisowurtzitane (CL-20) with a selection of insensitive explosives, including nitroguanidine (NQ), 2,4,6-trinitrotoluene (TNT), 2,6-diamino-3,5-dinitropyridine-1-oxide (ANPyO), 2,4,6-triamino-1,3,5-trinitrobenzene (TATB), 3-nitro-1,2,4-triazol-5-one (NTO) and 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105). DSC measurements showed that ANPyO, TATB, NTO and LLM-105 were compatible with CL-20. The compatibility of CL-20/NQ, CL-20/TNT, CL-20/ANPyO, CL-20/TATB, CL-20/NTO and CL-20/LLM-105 mixtures was further explored using the VST, which revealed that all the selected insensitive explosives were compatible with CL-20. Possible chemical interactions were suspected for CL-20/TATB from the FTIR results and for CL-20/NTO from XRD analysis. In summary, ANPyO and LLM-105 demonstrated the optimal compatibility with CL-20.
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