JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2018
·
IF 3.794
Zhijian Sun,Lei Liu,Yuxiao Lu,Guangyue Shi,Jiajun Li,Lei Ma,Jie Zhao,Hongli An
NASION-type Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) is prepared by a novel sol-gel method using low cost inorganic germanium (GeO 2 ) as the precursor. The composition and phase transformation during the heating of the LAGP precursors are analyzed using thermogravimetric-differential scanning calorimetry (TG-DSC) and X-ray diffraction (XRD). The structures and morphologies of the LAGP are characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the LAGP annealed at 900 ℃ is partially crystallized and consists of a large number of nanoscale grains surrounded by amorphous regions. The LAGP particles present an irregular morphology with a large size distribution over a range of 0.2–1 μm. In addition, ionic conductivities of the prepared LAGP first increase and then decrease with an increase in the sintering temperature and time. A high ionic conductivity (4.18 × 10 −4 Scm -1 ) with an activation energy of 0.30 eV are obtained for the LAGP sample sintered at 900 °C for 8 h.
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NANO
·
2018
·
IF 1.1
Caiwei Li,Weimeng Si,Yuting Wu,Cheng Zhang,Wu Lei,Qingli Hao
Poly(3-methylthiophene)/reduced graphene oxide (P3MT/RGO) modified glassy carbon electrode (GCE) was fabricated via a facile procedure. P3MT was directly electrodeposited on the RGO coated electrode and employed for the electrochemical detection of paracetamol (PCT). The morphology of composite was characterized by scanning electron microscopy (SEM). Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to investigate the electrochemical behaviors of PCT on P3MT/RGO/GCE. Experimental parameters, such as the scan rates, polymerization laps and the pH of buffer solution were optimized. Under the optimal conditions, the anodic peak current in DPVs varies linearly with the concentration of PCT, and the limit of detection was 0.025 μ M. Moreover, the proposed P3MT/RGO/GCE also exhibited superior stability and reproducibility.
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ORGANIC & BIOMOLECULAR CHEMISTRY
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2019
·Vol. 17
·期 21
·5381-5391
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IF 3.49
Chunfeng Jiang,Quan Liu,Jiaming Liu,Kaixuan Liu,Liangliang Tian,Mingfei Duan,Ying Wang,Zhufang Shen,Youjun Xu
A convenient synthesis of novel 3-deoxy-5-hydroxy-1-aminocarbasugars was developed here. The benzyl-protected glucose-derived ketone 12 was selectively converted in high yield to enone 13via retro-Michael elimination of BnOH. The double bond of 13 was regio- and stereo-selectively reduced by the induction of C4-α-OBn to the multi-functionalized 15. 15 contained all the functionalities with similar configurations to carbasugars but with 3-H and 5-OH in the ring, and it would be a very interesting building block for organic synthesis or for bioactive compounds. As one application, 15 was further transformed into 1-amino-carbasugars by the reductive amination and final deprotection of benzyls. The targets were subjected to the in vitro inhibitory activity test against sucrase or maltase. The inhibitory activity of 17b, 17h or 17j against sucrase was nearly similar to that of voglibose. In comparison with voglibose, in vivo results similarly showed that 17b, 17h or 17j could lower the post-prandial blood glucose level after sucrose loading in healthy male ICR mice, while miglitol or acarbose was less effective. The molecular modeling study of some targets or voglibose with human sucrase could explain the inhibiting action.
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PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2013
·
IF 2.004
Qian Zhang,Xiuhong Wang,Xilian Wei,Jie Liu
The detailed micellization behavior of 3-alkyloxy-2-hydroxypropyl trimethylammonium chloride (RnHTACl, n = 12, 14, 16) in aqueous solution was studied by electric conductivity, steady-state fluorescence, and isothermal titration microcalorimetry (ITC) methods. The critical micelle concentration (CMC) and degree of counterion dissociation (α0) were estimated from conductivity curves in the temperature range of 293.15 K to 323.15 K. Then the thermodynamic parameters of micellization (ΔGm0, ΔHm0, and ΔSm0) were calculated by applying a mass-action model equation. On the basis of the ITC results, the CMCs and thermodynamic parameters were also estimated at 293.15 K, which were basically consistent with the results from the conductivity method. According to the Turro–Yekta method, the micelle aggregation number (Nagg) of RnHTACl was determined through static luminescence quenching, and found that the decreased temperature, the elongation of the alkyl chain length or the increased concentration of RnHTACl could lead to an increase of the Nagg.
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JOURNAL OF PHYSICAL ORGANIC CHEMISTRY
·
2014
·Vol. 27
·期 6
·498-503
·
IF 1.245
Yimei Tang,Xiaoling Hu,Ping Guan,Xiangping Lin,Xiaoqian Li
Using microwave-assisted synthesis method, a series of paramagnetic ionic liquids comprising 1-vinyl-3-alkylimidazolium VRIM + cation and tetrahalogenidoferrate (III) FeCl m Br 4 − m − anion were designed and synthesized. The structure was analyzed using 1 H NMR and Raman spectroscopy. Ultraviolet–visible absorption spectra, thermal stability, magnetic susceptibility, viscosity, ionic conductivity, and solubility were characterized. Results show that elongation of the alkyl chain leads to replacement of bromides with a small amount of chlorides in the anion, shifting of UV maximum absorption peaks to shorter wavelengths, reduction of ionic conductivity, and solubility in polar solvents, as well as increase in fluidity, magnetic susceptibility, and solubility in nonpolar solvents. Copyright © 2014 John Wiley & Sons, Ltd.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Yuyuan Deng,Qin Zhang,Huachuan Zhang,Chengxi Zhang,Wenhu Wang,Yi Gu
To study oxazine ring formation in benzoxazine synthesis from phenol, primary amine and formaldehyde, reactions between 2-phenylaminomethylphenol (Mannich base) and formaldehyde in homogeneous dioxane/water solution are researched. Reaction orders, rate constants at different temperatures, and activation energy are calculated, the process of reaction is proposed, and the influence of acid and base is discussed. The reaction can occur at low temperature and generate the product 3,4-dihydro-2H-3-phenyl-1,3-benzoxazine. No intermediate 2-(N-hydroxymethyl-N-phenylamino)methylphenols are observed. The concentration of a Mannich base has little effect on the reaction rate, while the reaction is first-order to formaldehyde. Based on chemical properties of formaldehyde in aqueous solution, the reaction process includes the following three steps: degradation of poly(oxymethylene) glycols to methylene glycol, dehydration of methylene glycol to formaldehyde molecule, and the reaction between a Mannich base and formaldehyde molecule to benzoxazine. Dehydration of methylene glycols to formaldehyde molecules is the rate-controlling step.
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高影响因子
POLYMER COMPOSITES
·
2013
·Vol. 34
·期 11
·1801-1808
·
IF 1.482
Jie Zhao,Yu Xie,Zhanggao Le,Yan Luo,Yunhua Gao,Rong Zhong,Yuancheng Qin,Jianfei Pan,Yan Huang
The BaFe 12 O 19 /multiwall carbon nanotubes/poly(3-methyl-thiophene) (BaFe 12 O 19 /MCNTs/P(3MT)) composites were synthesized through an in situ chemical polymerization of 3-methyl-thiophene (3MT) in the presence of BaFe 12 O 19 /MCNTs composite powders. The BaFe 12 O 19 /MCNTs/P(3MT) composites were characterized by the fourier transform infrared spectrometry (FTIR) and X-ray diffraction (XRD). The morphologies of the composites were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electric conductive properties were tested by a four-probe conductivity tester and the magnetic properties were measured by vibrating sample magnetometer (VSM). The electromagnetic performance tests showed that when the mass ratio of BaFe 12 O 19 to MCNTs was 0.4, and the BaFe 12 O 19 /MCNTs to P(3MT) was 0.15, the conductivity, saturation magnetization ( M s ) and residual magnetization ( M r ) of the BaFe 12 O 19 /MCNTs/P(3MT) composites achieved 166.740 S/m, 29.884 emu/g, and 17.581 emu/g, respectively. POLYM. COMPOS., 34:1801–1808, 2013. © 2013 Society of Plastics Engineers
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INTERNATIONAL JOURNAL OF FOOD PROPERTIES
·
2016
·
IF 1.586
Li-yi Zhao,Jian Chen,Zhi-qiang Wang,Rui-meng Shen,Nan Cui,Ai-dong Sun
Cyanidin-3-glucoside is an anthocyanin that is abundant in blueberry. Lauric acid was used as the acyl donor in the acylation of cyanidin-3-glucoside. Preparative high performance liquid chromatography was used to separate and purify the acylated cyanidin-3-glucoside, the acylated rate was 30.78%. Fourier transform infrared spectroscopy and liquid chromatography mass spectrometry were used to confirm the basic structure of cyanidin-3-glucoside. Lauric acid was combined with cyanidin-3-glucoside. Lauric acid reacted with the glucoside’s primary hydroxyl group and removed a molecule of water, thereby resulting in the obtained structure. The compositions of the unacylated cyanidin-3-glucoside and acylated cyanidin-3-glucoside were compared under different temperatures and under illumination. The effects of different concentrations of additive compounds on the stability of acylated cyanidin-3-glucoside were compared. Stability of acylated cyanidin-3-glucoside was obviously higher than that of the unacylated cyanidin-3-glucoside because of the higher stability of the ester group than the hydroxyl group. The primary hydroxyl esterification of glucoside improved cyanidin-3-glucoside.
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ChemSusChem
·
2016
·Vol. 9
·期 10
·1118-1124
·
IF 7.116
Xuefeng Liu,Zipeng Xing,Hang Zhang,Wenmei Wang,Yan Zhang,Zhenzi Li,Xiaoyan Wu,Xiujuan Yu,Wei Zhou
Graphical Pass the Mo : A 3 D sandwich of mesoporous black TiO 2 (MBT)/MoS 2 /MBT was fabricated using a facile mechanochemistry method combined with an in situ solid-state chemical reduction approach. The material exhibited excellent visible-light-driven photocatalytic performance for pollutant degradation and hydrogen evolution owing to the sandwich-like heterojunction structure and Ti 3+ doping. A novel 3 D mesoporous black TiO 2 (MBT)/MoS 2 /MBT sandwich-like nanosheet was successfully fabricated using a facile mechanochemical process combined with an in situ solid-state chemical reduction approach, followed by mild calcination (350 °C) under an argon atmosphere. The MBT/MoS 2 /MBT exhibits a 3 D sandwich-like nanosheet structure and heterojunctions are formed at the interfaces between MoS 2 and black TiO 2 . The significantly narrowed band gap of MBT/MoS 2 /MBT is attributed to the introduction of MoS 2 and the formed Ti 3+ species in the frameworks. The visible-light photocatalytic degradation rate of methyl orange and the hydrogen production rate are as high as 89.86 % and 0.56 mmol h −1 g −1 , respectively. The introduction of MoS 2 and Ti 3+ in the frameworks favors the visible-light absorption and the separation of photogenerated charges, and the 3 D sandwich-like heterojunction structure facilitates the transfer of photogenerated charges.
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PubMed
高影响因子
MACROMOLECULES
·
2017
·
IF 5.835
Dongdong Zhou,Shaoyong Huang,Jingru Sun,Xinchao Bian,Gao Li,Xuesi Chen
The crystallization behaviors and microstructures of poly(l-2-hydroxyl-3-methylbutanoic acid)/poly(l-lactide) blends [P(L-2H3MB)/PLLA] were investigated by OM, DSC, SAXS, in situ temperature-dependent WAXD, and in situ synchrotron WAXS. The blends exhibited a homogeneous state at 250 °C. In the cooling process, P(L-2H3MB), with higher melting temperature, crystallized first at 166.7 °C and drove the formation of the phase separation and microstructure. And the amorphous P(L-2H3MB) and PLLA were excluded into the interlamellar and interfibrillar regions of the former P(L-2H3MB) crystallites. For P(L-2H3MB)/PLLA (5/5), the amorphous P(L-2H3MB) in the interfibrillar regions continued to form crystallites sequentially at 134.6 °C, which clearly confirmed the fractional crystallization of P(L-2H3MB). In our knowledge, this unique fractional crystallization has not been reported yet, of the component in miscible blend, which crystallized first under little confinement. This work provided a new viewpoint and understanding of the relationship between fractional crystallization and microstructures in crystalline/crystalline blends.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2017
·Vol. 32
·期 4
·772-776
·
IF 0.447
Xiang Tao,Wang Qingxiu,Duan Lijie,Liu Fude
A conjugated polymer of poly(4,4'-bis(thien-2-yl)azobenzene-co-3-hexylthiophene) (PTAB-H), bearing azo group in main chain and soluble in THF, chloroform, was synthesized through FeCl3 oxidation copolymerization with 3-hexylthiophene, and the monomer of 4,4'-bis(thien-2-yl)azobenzene was synthesized by Sandmeyer reaction and Suzuki reaction. The UV-Vis spectra of PTAB-H reveal that azo group in the main chain can extend the absorption and lower the band gap. The fluorescent spectra, photoluminescence (PL) spectra, cyclic voltammetry (CV) of PTAB-H were recorded.The gel permeation chromatography (GPC), thermogravimetry analysis (TGA), and differential scanning calorimetry (DSC) measurements indicated that the molecular weight Mn, Mw and polydispersity indices (PDI) of the polymer are 10 876 g/mol, 22 338 g/mol and 2.05 respectively and the temperature of 5% weight-loss is 224.6 °C. No glass transition and crystallization melting peak was observed in the temperature range from 30 °C to 400 °C.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 20
·
IF 1.86
Wei Qian,Chunhui Shen,Shanjun Gao,Jingluan Xiang
Phosphonic acid functionalized siloxane crosslinked with 3-glycidoxypropyltrimethoxysilane (GPTMS) grafted polybenzimidazole (PBI) membranes are prepared by sol–gel process. The structure of the membranes is characterized by Fourier-transform infrared spectroscopy and X-ray diffraction spectroscopy. SEM images of the membranes show that the membranes are homogeneous and compact. The crosslinked membranes exhibit excellent thermal stability, chemical stability and mechanical property. The proton conductivity of the crosslinked membranes increases by an order of magnitude over range of 20 °C to 160 °C under anhydrous condition, which can reach 3.15 × 10 −2 S cm −1 at 160 °C under anhydrous condition. The activation energy of proton conductivity for membranes decreases with increase of PBI, because the formation of hydrogen bond network between the phosphonic acid and the imidazole ring can enhance the continuity of hydrogen bond in the membrane. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44818.
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