RSC Advances
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2016
·Vol. 6
·期 101
·98761-98767
·
IF 3.289
Liqun Ma,Shaobo Dong,Zijian He,Yulin Yang,Hongge Jia,Yutao Di,Yanan Tang,Yazhen Wang
In order to develop a new silane coupling agent that can be used as coupling agent and initiator, (3-(tert-butylperoxy)propyl)trimethoxysilane was synthesized by using tert-butyl hydroperoxide and (3-chloropropyl) trimethoxysilane. The new reagent was characterized by 1H-NMR, FT-IR and mass spectroscopy. The thermokinetics of the new reagent was investigated, including thermal stability, decomposition constants (Kd), activation energy (Ea), the heat of decomposition (ΔH) and pre-exponential factor (Ad). In addition, the application of (3-(tert-butylperoxy)propyl)trimethoxysilane on modificating nano-TiO2 and initiating polymerization was studied. The structures of the products of modificating nano-TiO2 and initiating polymerization were verified by XPS, FT-IR. The results indicated that the new reagent had the characteristics of a coupling agent and initiator.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Wei Fang,Naiqing Zhang,Lishuang Fan,Kening Sun
Polypyrrole-coated Bi 2 O 3 @CMK-3 nanocomposite is prepared by nanocasting technique and chemical polymerization method. Bi 2 O 3 nanoparticles are dispersed into CMK-3 matrix, and polypyrrole is coated onto the surface of Bi 2 O 3 @CMK-3. Polypyrrole-coated Bi 2 O 3 @CMK-3 nanocomposite as an anode material for lithium-ion batteries has an outstanding power capability (321 mAh g −1 at a current rate of 6 A g −1 ) and a significantly improved cycling ability (380 mAh g −1 after 1000 cycles at a current rate of 5 A g −1 ). The greatly enhanced electrochemical performance of polypyrrole-coated Bi 2 O 3 @CMK-3 nanocomposite is associated with the synergistic effect of highly conductive CMK-3, polypyrrole layer and Bi 2 O 3 nanoparticles. Such a configuration inhibits the aggregation of Bi 2 O 3 nanoparticles and preserves the structure integrity of electrode material, in addition to highly improving the electrical conductivity and maintaining the stable structure of solid electrolyte interface film.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 100
·期 1
·265-275
·
IF 2.787
Longwen Wu,Xiaohui Wang,Zhengbo Shen,Longtu Li
The (1− x )BaTiO 3 – x Bi(Zn 2/3 Nb 1/3 )O 3 ( x = 0.01–0.30) ceramics were synthesized by solid-state reactions. The solubility limit was determined to be x = 0.20. A systematic structural transition from a tetragonal phase ( x ≤ 0.034), to a mixture of tetragonal and rhombohedral phases (0.038 ≤ x ≤ 0.20), and finally to a pseudocubic phase ( x ≥ 0.22) at room temperature was identified. Dielectric measurement revealed a ferroelectric ( x ≤ 0.04) to relaxor ( x ≥ 0.06) transition with permittivity peak broadening and flattening, which was further verified by Raman spectroscopy and differential scanning calorimetry (DSC). Activation energies obtained from the Vogel–Fulcher model displayed an increasing trend from ~0.03 eV for x ~ 0.05, to unusually high values (>0.20 eV) for the compositions with x ≥ 0.15. With the increase in Bi(Zn 2/3 Nb 1/3 )O 3 content, the polarization hysteresis demonstrated a tendency from high nonlinearity to sublinearity coupled with the reduction in remnant polarization and coervice field. The deconvolution of the irreversible/reversible polarization contribution was enabled by first-order reversal curve distributions, which indicates that the decreasing polarization nonlinearity with the increase in Bi(Zn 2/3 Nb 1/3 )O 3 concentration could be related with the change from the ferroelectric domain and domain wall contributions to the weakly coupled relaxor behaviors.
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RSC Advances
·
2014
·Vol. 4
·期 81
·42991-42995
·
IF 3.708
He Sun,Haobo Sun,Wei Wang,Handong Jiao,Shuqiang Jiao
Insoluble Prussian blue (IPB), Fe4[Fe(CN)6]3, is synthesized at room temperature and found to achieve a relatively high storage capacity of 146 mA h g−1 (at a 20 mA g−1 rate) as the cathode material for Na-ion batteries with high potential plateaus. XRD, SEM and TEM are employed to characterize the morphology and microstructure of the as-synthesized IPB. First-principles calculation is introduced to study the electrochemical mechanism. Generally, the environmental friendliness and low cost of the material make it possible to be used for large-scale electric storage applications.
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ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Yunlei Zhou,Zhenning Xu,Mo Wang,Xiaomeng Meng,Huanshun Yin
A label-free electrochemical immunosensor for sensitive detection of indole-3-acetic acid (IAA) was developed using gold nanoparticles (AuNPs) functionalized with horseradish peroxidase labeled immunoglobulins G (AuNPs-HRP-IgG) as signal amplification probe and rat monoclonal antibody against IAA as capture probe. AuNPs-HRP-IgG could be immobilized and through the interaction between 4-aminophenylboronic acid and a single N-glycosylation site, which exist in the CH2 domain of IgG. The electrochemical immunosensor was characterized by differential pulse voltammetry (DPV) in 0.1 M PBS (pH 7.4) containing Fe(CN) 6 3−/4− as redox probe. The decreased oxidation peak current of Fe(CN) 6 3−/4− was used to monitor the antibody–antigen interaction. The electrochemical immunosensor exhibited a linear range from 1 × 10 −9 to 5 × 10 −6 M with a limit of detection of 5.5 × 10 −10 M (S/N = 3). The proposed electrochemical immunosensor could well discriminate IAA from other phytohormones, such as gibberellin, abscisic acid and salicylic acid. In addition, IAA extracted from leaf of mung bean sprouts was detected using the developed immunosensor for evaluating its applicability, and the recovery was from 93.5% to 106.75%.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2015
·
IF 2.858
Xuehui Li,Yongming Lu,Wenna Zhang,Shixiong Yuan,Liyuan Zhou,Liming Wang,Qiuying Ding,Dandan Wang,Weiwei Yang,Zhengnan Cai,Yan Chen
Polysaccharide TLH-3 from the fruit body of Tricholoma lobayense Heim has shown outstanding antioxidant activity. In order to further explore it, TLH-3 was successfully modified to obtain a sulfated derivative (STLH-3). The chemical characteristics of STLH-3 and TLH-3 were determined by high performance liquid chromatography and infrared spectroscopy. Antioxidant activity and cytotoxicity of the samples were investigated in vitro . The antioxidant activities of STLH-3 were significantly improved. In the four indicators of antioxidant activity, the 1, 1-diphenyl-2-picrylhydrazyl (DPPH) and superoxide anion scavenging activities of STLH-3 have exceeded that of Vitamin C (Vc). The cytotoxicity against tumor cells including human cervical carcinoma cell line (HeLa) and human breast cancer cell line (MCF-7) of STLH-3 was obviously stronger than that of TLH-3. STLH-3 had no toxic on human embryonic lung fibroblasts (HELF) cells. These results suggested that STLH-3 would be a promising bioactive macromolecule for potential applications in the field of health care and pharmaceutical.
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PubMed
高影响因子
ECS Electrochemistry Letters
·
2015
·Vol. 4
·期 3
·A29
·
IF 1.789
VanTu Nguyen,YueLi Liu,Xue Yang,Wen Chen
The precursor of Fe2(MoO4)3 has been synthesized by precipitation method, which is used to prepare high-capacity cathode material Fe2(MoO4)3/nanosilver composite for sodium-ion batteries. The silver modifying does not affect the monoclinic structure of Fe2(MoO4)3 but improves its kinetics in terms of discharge capacity and rate capability. AC impedance measurements show that the Ag modification decreases the charge transfer resistance of Fe2(MoO4)3/nanosilver composite cathodes. Electrochemical studies confirm that the Fe2(MoO4)3/nanosilver composite exhibits capacity of 90 mAhg−1, and retains 84.5 % of capacity even after 50 cycles.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Ruiping Chen,Yan Wang,Saqib Nawaz Khan,Feifei Xing,Simiao Li,Yiheng Rao,Hao Wang,Zengxia Mei
All-inorganic CsPb(I1-xBrx)3 perovskite solar cells (PSCs) have increasingly broken record power conversion efficiency (PCE), however the poor stability in humid environment is still a serious bottleneck. To suppress the humidity-caused rapid transformation from black phase to yellow phase, germanium (Ge) doping is introduced to improve the tolerance factor of CsPb1-xGexI2.85Br0.15 and its photoelectric performance. A combined investigation of the structural and optical properties reveals a successful substitution of lead (Pb) with Ge in the films as well as a champion PCE of 19.70% for the 1% Ge doped PSC. More significantly, the Ge doped device retained 91.5% of its initial efficiency after being stored in air for 500 hours without any encapsulation process, in contrast to the 83.7% for the undoped counterpart.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 10
·1-12
·
IF 5.3
Xiao Rongsheng,Dai Hongliang,Liu Xingyu,Qi Jingwen,Bao Meishuo,Wang Xingang,Li Mingde,Zhang Wuxiang,Yan Dengxin
A novel colorimetric approach specifically designed to effectively identify the presence of 3-aminophenol (3-AP) in environmental water is introduced. Briefly, a nitrogen-doped carbon-supported cobalt nanozyme (Co@CN-1) was synthesized and utilized to improve the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of peroxymonosulfate (PMS). Comparative catalytic reactions confirmed that the performance of PMS as an activator exceeds that of hydrogen peroxide catalytically by a factor of 3.5. The catalytic reaction parameters underwent optimization, further resulting in the derivation of a linear detection equation for 3-AP, expressed as inhibition rate (IR%) = 3.35[3-AP]—4.36 (0–20 μM, R 2 = 0.994) and IR% = 1.43[3-AP] + 31.87 (20–36 μM, R 2 = 0.992), with the limit of detection (LOD) of 2.84 μM. The linear relationship between 3-AP concentration and the conversion of color to grayscale value (GSV) was established by smartphones, expressed as GSV = 1.28[3-AP] + 147.10 ( R 2 = 0.972). Density functional theory calculations revealed that Co acts as the preferred active site for donating electrons in PMS activation. This work provides a rapid and accurate approach for monitoring 3-AP concentration, enabling real-time analysis and potentially contributing to environmental and ecological studies. Graphical Abstract
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BIOORGANIC CHEMISTRY
·
2024
·
IF 4.5
He Liu,Shixi Wang,Meng Xu,Kaiyue Zhang,Qian Gao,Hualei Wang,Dongzhi Wei
( R )-selective transaminases show promise as catalysts for the asymmetric synthesis of chiral amines, which are building blocks of various small molecule drugs. However, their application is limited by poor substrate acceptance and low catalytic efficiency. Here, a potential ( R )-selective transaminase from Fodinicurvata sediminis (FsTA) was identified through a substrate truncating strategy, and used as starting point for enzyme engineering toward catalysis of 4-hydroxy-2-butanone, a substrate that poses challenges in catalysis. Molecular docking and dynamics simulations revealed Y90 as the key residue responsible for poor substrate binding. Starting from the variant (Y90F, mut1) with initial activity, FsTA was systematically modified to improve substrate-binding through active site reshaping and consensus sequence strategy, yielding three variants (H30R, V152K, and Y156F) with improved activity. A quadruple mutation variant H30R/Y90F/V152K/Y156F (mut4) was also found to show a 7.95-fold greater catalytic efficiency ( k cat / K M ) than the initial variant mut1. Furthermore, mut4 also enhanced the thermostability of enzyme significantly, with the T m value increasing by 10 °C. This variant also exhibited significantly improved activity toward a series of ketones that are either not accepted or poorly accepted by the wild-type. This study provides a basis for the rational design of an active to creating variants that can accommodate novel substrates.
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POLYMER INTERNATIONAL
·
2024
·
IF 2.9
Guoqiang Wang,Xiang Chi
Poly[(3-hydroxybutyrate)- co -(4-hydroxybutyrate)] (P34HB), poly[(butylene succinate)- co -(butylene furandicarboxylate)] (PBSF) and poly(vinyl acetate) (PVAc) were melt-blended to prepare P34HB/PBSF/PVAc blends with improved ductility. The thermal properties, mechanical properties, rheological properties and morphology of the blends were systematically studied. The addition of PBSF promoted the melt crystallization of P34HB. The temperatures at 5% weight loss of the blends were higher than that of P34HB. The surface of the blends was investigated using scanning electron microscopy. The surface of P34HB was very smooth, but the surfaces of the blends were rough. PVAc can increase the compatibility between P34HB and PBSF. Compared with P34HB, the elongation at break of the blends was increased to 219.1%. © 2024 Society of Industrial Chemistry.
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Progress in Natural Science-Materials International
·
2024
·
IF 4.8
Shijia Liu,Haibin Wang,Xi Wang,Jieshu Zhou,Hongyan Liang
Electroreduction of CO 2 for formic acid production has been regarded as an efficient option for CO 2 utilization. However, under high current, achieving high selectivity for formic acid is challenging, which cannot meet industrial demands. Herein, we reported a type of Bi/In(OH) 3 (BIO) heterojunction reconstructed from Bi 2 S 3 /In(OH) 3 during electrochemical process, in which In(OH) 3 was applied to modulate the electronic structure of Bi. This strategy efficiently enhanced the ∗OCHO intermediates adsorption and lead to a decent selectivity towards formic acid under high current density. BIO displays faraday efficiency of formic acid beyond 95 % across a wide range current density of 200–400 mA cm −2 , where the highest value reached 97.7 % at 400 mA cm −2 . This work clarified the mechanism of CO 2 electroreduction to HCOOH on heterojunction, guiding the design of advanced catalysts.
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危险品化学品经营许可证（带存储）