RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 40
·期 1
·385-397
·
IF 0.88
Wang Yong,Chen Guihua,Zhang Fumin,Li Liquan
Ni-incorporated SBA-15 magnetic composites were two-stage hydrothermal synthesized from initial strong acidic media through a pH-adjusting method. The structure, morphology, surface area and pore size distribution of the samples were systematically characterized by using XRD, FT-IR, SEM, TEM and N 2 physical adsorption techniques. It was found that, when pH was adjusted to 7, the obtained sample still could exhibit hexagonal mesostructure, very similar to that of the pristine SBA-15 except for a slightly reduced long-range ordering and surface area. However, an increase in the unit cell and wall thickness of the samples suggested the more Ni species were incorporated into the framework of SBA-15. A further increase in pH to 9 produced deterioration of long-range ordering of the sample, possibly resulting from the blocking of some mesopores. Thus, the pH-adjusting method played an important role on the structure of Ni–SBA-15 composites. Measurements taken with increasing applied field revealed the samples having superparamagnetic behaviors. Furthermore, the saturation magnetization values were increased with the more Ni species transforming into magnetic nanoparticles by the increasing pH.
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CELLULOSE
·
2013
·Vol. 20
·期 2
·841-848
·
IF 3.476
Huo Jiansheng,Zheng Yuhui,Pang Shuting,Wang Qianming
In this paper, a novel luminescent hydrogel was successfully prepared by incorporating Tb-HSA (HSA = Human Serum Albumin) complex into cellulose host. The green luminescence intensities of Tb(III) exhibited on – off changes in terms of pH variation. At the same time, europium activated phosphor (GdVO 4 :Eu 3+ ) was immobilized into the cellulose hydrogels through two approaches. The photophysical properties of luminescent gels with the temperature variation were investigated by fluorescence. The new group of soft materials will display task-specific usages in sensing fields.
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CHEMICAL PAPERS
·
2012
·Vol. 67
·期 4
·423-428
·
IF 1.096
Zhu Guo-Quan,Wang Fa-Gang,Liu Yu-Ying,Gao Qiao-Chun
A series of water-soluble carboxymethyl chitosan (CMCS)/poly(propylene glycol) (PPG) blend films with various CMCS/PPG mole ratios were prepared by the solution casting method. Morphology of the CMCS/PPG blend films was investigated by scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of the CMCS/PPG blend films were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), tensile tests, and contact angle tests. It was found that the introduction of PPG can markedly affect the morphology and the properties of CMCS films.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 69
·期 1
·9-16
·
IF 1.66
Hu Qing,Chen Xiaofeng,Zhao Naru,Li Yuli,Mao Cong
This paper reports a facile method for fabricating monodispersed mesoporous bioactive glass sub-micron spheres (MBGS) using dodecylamine (DDA) as a catalyst and template agent in sol–gel process. The effects of synthesis conditions including the amount of DDA, temperature of hydrolysis and the volume ratio of alcohol to water (AW ratio) on the resulting particle size, morphology, monodispersity and pore size distribution of MBGS are investigated and discussed. The results indicate that the particle size, morphology, monodispersity and pore size distribution of MBGS depend on the amount of DDA, the temperature of hydrolysis and the AW ratio. Meanwhile, using DDA as the structure directing agent and hydrolysis catalyst under optimal synthesis conditions (e.g. 4 g DDA, hydrolysis temperature at 40 °C and AW ratio at 4) is in favor of obtaining MBGS with mesoporous surface structure, large specific surface area (362.073 m 2 g −1 ), relatively homogeneous particle size (~560 nm) as well as good apatite-forming activity. The unique structure and properties may turn MBGS into a good candidate as a drug delivery carrier or an injectable biomaterial for bone tissue regeneration.
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Journal of the Iranian Chemical Society
·
2015
·Vol. 13
·期 2
·261-266
·
IF 1.087
Tang Chengcheng,Wang Bin,Xing Wei,Hu Donghua,Yang Jing
Chloroplast was used as a biotemplate to synthesize titania (TiO 2 ) replica which was investigated as a semiconductor to construct a photoelectrochemical biofuel cell (PEBFC). The cylindrical stack structure of granum in chloroplast was retained in TiO 2 replica by ultrasonication (sonicated-TiO 2 ), while the chloroplast structure was retained for the prepared TiO 2 replica under the same condition without ultrasonication (unsonicated-TiO 2 ). The sonicated-TiO 2 exhibited a much greater specific surface area (up to 47.8 m 2 /g) than the unsonicated-TiO 2 (26.5 m 2 /g), which resulted in the sonicated-TiO 2 having a better performance than the unsonicated-TiO 2 .
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MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 11
·1869-1875
·
IF 3.741
Mei He,Wu Wenqin,Yu Beibei,Li Yibin,Wu Huimin,Wang Shengfu,Xia Qinghua
Co@Pt core-shell nanoparticles (NPs) were synthetized by a two-step reductive method using carbon (Vulcan XC-72) as a solid support. The NPs were characterized by X-ray diffraction, field emission gun scanning electron microscopy, energy dispersive X-ray spectroscopy, and transmission electron microscopy. Their electrochemical performance was evaluated by cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry, and these showed that the Co@Pt NPs display an electrocatalytic activity towards the oxidation of glucose that is much better than that of plain Pt NPs. Under optimized conditions and at pH 7.0, the oxidation current of glucose at a working potential of −50 mV (vs. SCE) is linearly related to its concentration in the 1.0 to 30 mM range, and the detection limit is 0.3 mM (S/N = 3). It therefore covers the clinical range. The sensor also exhibits excellent stability and repeatability.
Co@Pt core-shell nanoparticles (NPs) display an electrocatalytic activity towards the oxidation of glucose that is much better than that of plain Pt NPs. The oxidation current for glucose is linearly related to its concentration in the 1.0 to 30 mM range, and the detection limit is 0.3 mM (S/N =3).
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2014
·Vol. 119
·期 1
·597-603
·
IF 2.206
Xu Xiaopeng,Chen Si,Wu Bozhen,Ma Meng,Shi Yanqin,Wang Xu
The influence of allantoin (ALL) combined with zinc stearate (ZnSt 2 ), calcium stearate (CaSt 2 ), and ZnSt 2 –CaSt 2 (1:1), respectively, in different mass ratios on thermal stability of poly(vinyl chloride) (PVC) was investigated by Congo red test, discoloration test, and thermogravimetric analysis. The results indicated that ALL behaved as a good long-term thermal stabilizer for PVC, which was attributed to its ability to absorb hydrogen chloride released from the degradation of PVC. Moreover, ALL was able to extend the stabilization time of PVC containing ZnSt 2 –CaSt 2 and postpone “zinc burning.” Fourier transform infrared spectra confirmed that ALL can react with ZnCl 2 to produce an inert complex, which is responsible for postponing “zinc burning.”
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WOOD SCIENCE AND TECHNOLOGY
·
2014
·Vol. 48
·期 6
·1241-1255
·
IF 1.873
Liu Wendi,Chen Tingting,Wen Xiaoyun,Qiu Renhui,Zhang Xincong
Bamboo fibers were mechanically extracted from raw green bamboos by crushing, rolling, and combing techniques with 1,4-butanediol as a solvent. The morphology of the bamboo fibers thus obtained was analyzed. The bamboo fibers were treated with isocyanatoethyl methacrylate (IEM) in the presence of dibutyltin dilaurate as a catalyst, to improve the interfacial adhesion between the fibers and unsaturated polyester (UPE) resins. The bamboo fibers reinforced UPE composites were prepared by hand lay-up compression molding. FTIR, XPS, and NMR analyses indicated that the IEM was covalently bonded onto the bamboo fibers via carbamate linkages. The IEM treatments significantly increased the tensile strength, flexural strength, flexural modulus, and water resistance of the resulting composites and yet decreased the impact strength of the composites. The SEM images of the tensile-fractured surfaces of the IEM-treated bamboo fibers–UPE composites revealed that the fiber treatments markedly improved the interfacial adhesion between the bamboo fibers and UPE resins.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2014
·Vol. 44
·期 11
·1165-1170
·
IF 2.147
Pu Zonghua,Liu Qian,Asiri Abdullah M.,Sun Xuping
In this communication, we demonstrate the preparation of Ni nanoparticles-graphene hybrid film via simultaneous electrochemical reduction of graphene oxide and Ni 2+ on conductive substrate for the first time. We further show the utilization of such hybrid film as an efficient oxygen evolution reaction electrocatalyst with highly catalytic activity and good durability.
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FIBERS AND POLYMERS
·
2014
·Vol. 15
·期 8
·1609-1615
·
IF 1.113
Yu Yuanyuan,Yuan Jiugang,Wang Qiang,Fan Xuerong,Wang Ping,Cui Li
Our previous studies have demonstrated that cotton fabrics treated with soluble immobilized-cellulase showed considerably lower degradation and higher retention of tensile strength than those treated with free cellulase. It is important to investigate the surface morphology and structure of cotton fibres for understanding the enzymatic degradation. In this study, the effects of the soluble immobilized-cellulase on the surface morphology and structure of cotton fibres were investigated. The ultrastructural changes in the fibre surfaces were inspected using Tapping-Mode Atomic Force Microscopy (TM-AFM) and scanning electron microscopy (SEM), and the results showed that the smooth surfaces could be obtained after the immobilized-cellulase treatment, and no obvious damage was observed on the fibre surfaces. The hydrogen bonds in the certain depth area beneath the fibre surface were investigated using Attenuated Total Reflectance Fourier-Transform Infrared Spectroscopy (ATR-FTIR) after the cellulase treatments. Furthermore, the result of fibre accessibility indicated that the hydrolysis occurring in the interior of the cotton fibres was limited during the immobilized-cellulase treatment. Crystalline index (CI) of the cotton fibres treated with free cellulase was slightly higher than that of fibres treated with immobilized cellulase.
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CATALYSIS LETTERS
·
2014
·Vol. 144
·期 6
·1001-1008
·
IF 2.291
Lin Chao,Tao Kai,Hua Dayin,Ma Zhen,Zhou Shenghu
Abstract Bimetallic Au 3 M (M = Ni, Co, Fe) nanoparticles (NPs) were synthesized by reducing a mixture of Au 3+ and metal cations (Ni 2+ , Co 2+ , Fe 3+ ) by butyllithium in the presence of oleylamine. Au 3 M NPs were then deposited onto a commercial SiO 2 support. The Au 3 M/SiO 2 samples were not particularly active in the catalytic reduction of p -nitrophenol unless they were converted into Au–MO
x
/SiO 2 after appropriate thermal treatment in air. The Au–MO
x
/SiO 2 catalysts showed good thermal stability and significantly higher p -nitrophenol conversions than Au/SiO 2 . Relevant characterization was conducted employing X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy, and ultraviolet–visible spectroscopy. Graphical Abstract
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Journal of Coatings Technology and Research
·
2014
·Vol. 11
·期 4
·517-531
·
IF 1.28
Li Xingjian,Hu Jing,Sun Daoxing,Zhang Yiheng
In the work, click chemistry coupling reaction was used to modify waterborne polyurethane (WPU) with a silane coupling agent, and then the as-prepared waterborne siloxane-polyurethane dispersion was incorporated into the nanosilica moieties forming the nanosilica reinforced waterborne siloxane-polyurethane (WSPUSi) nanocomposites. WSPUSi was characterized by FTIR, 1 H NMR, X-ray diffraction analysis, mechanical property testing, transmission electron microscopy, and thermogravimetric analysis. In order to highlight the excellent performance of WSPUSi, the traditional WPU/nanosilica composites (TWPUSi) were also fabricated. Comparative study on the water sorption, scanning electron microscopy, acetone and toluene absorption and UV–visible transmission spectroscopy of WSPUSi and TWPUSi with the varying nanosilica was conducted. The research results indicate that WSPUSi nanocomposites with reinforced mechanical properties and thermal stability showed excellent comprehensive performance containing water resistance and solvent resistance in comparison with TWPUSi.
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