JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 1
·504-518
·
IF 2.302
Wan Qing,Liu Meiying,Xie Yili,Tian Jianwen,Huang Qiang,Deng Fengjie,Mao Liucheng,Zhang Qingsong,Zhang Xiaoyong,Wei Yen
Graphene oxide (GO)-based polymer nanocomposites were fabricated in aqueous solution via a novel strategy combination of mussel-inspired chemistry and Michael addition reaction. These GO-based polymer nanocomposites were used as efficient absorbents for the removal of organic dyes methylene blue (MB) from the aqueous solution. The successful preparation of GO-based polymer nanocomposites (GO-PDA-PSPSH) was confirmed by a number of characterization techniques in detail. Furthermore, a series of influential factors such as contact time, initial solution pH, and temperature were investigated and optimized. The optimal adsorption time of GO-PDA-PSPSH nanocomposites toward MB was 58 min. The maximum adsorption efficiency was occurred at pH 7. On the other hand, accompanying with the elevation of temperature, removal efficiency of GO-PDA-PSPSH nanocomposites was significantly increased, indicating that the adsorption process of MB by GO-PDA-PSPSH nanocomposites was endothermic. More importantly, the adsorption capability of GO-PDA-PSPSH nanocomposites was obviously greater than many other GO-based nanocomposites. Taken together, we have developed a facile biomimetic strategy for the preparation of GO-based polymer nanocomposites, which showed excellent adsorption capability toward MB and are promising for environmental adsorption applications.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 20
·期 7
·1941-1948
·
IF 2.327
Li Mei,Yin Wenchao,Han Xianlong,Chang Xiaoqing
The homogeneous polyaniline–graphene oxide (PANI-GO) nanocomposites were facilely assembled with a redox system in which cumene hydroperoxide (CHP) and iron dichloride (FeCl 2 ) acted as oxidant and reductant, respectively. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that PANI scales coated uniformly on the surface of GO sheets owing to the synergistic effect between the PANI and GO. The obtained PANI-GO nanocomposites exhibited improved electrochemical performance as an electrode material for supercapacitors compared with the pure PANI. The specific capacitance of the PANI-GO nanocomposites was high up to 308.3 F g −1 , much higher than that of the pure PANI with specific capacitance of 150 F g −1 at a current density of 1 A g −1 in 2 M H 2 SO 4 electrolyte. The Raman and XPS results illustrated that enhanced electrochemical performance might be attributed to the π - π conjugation between the PANI and GO sheets.
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高影响因子
AMINO ACIDS
·
2016
·Vol. 48
·期 7
·1601-1617
·
IF 3.196
Yu Haining,Guo Zhengzhao,Shen Shengrong,Shan Weiguang
As being a necessary amino acid, taurine plays an important role in the regulation of neuroendocrine functions and nutrition. In this study, effects of taurine on mice gut microbes and metabolism were investigated. BALB/C mice were randomly divided into three experimental groups: The first group was administered saline (CK), the second was administered 165 mg/kg natural taurine (NE) and the third one administered 165 mg/kg synthetic taurine (CS). Gut microbiota composition in mice feces was analyzed by metagenomics technology, and the content of short-chain fatty acids (SCFA) in mice feces was detected by gas chromatography (GC), while the concentrations of lipopolysaccharide (LPS) and superoxide dismutase (SOD) were detected by a LPS ELISA kit and a SOD assay kit, respectively. The results showed that the effect of taurine on gut microbiota could reduce the abundance of Proteobacteria , especially Helicobacter . Moreover, we found that the SCFA content was increased in feces of the NE group while LPS content was decreased in serum of the NE group; the SOD activity in serum and livers of the NE and CS groups were not changed significantly compare to that of the CK group. In conclusion, taurine could regulate the gut micro-ecology, which might be of benefit to health by inhibiting the growth of harmful bacteria, accelerating the production of SCFA and reducing LPS concentration.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 7
·6829-6834
·
IF 1.798
Su Chang,Li Yu,Li Shouchun,Liu Li,Guo Xuexin,Lian Hongwei,Guan Xiulong
Pure and Pr-doped α-Fe 2 O 3 nanotubes are successfully synthesized via electrospinning and following calcined method. The crystal, morphologies structures and composed of the as-prepared samples are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The researches of the gas sensing properties of the samples show that Pr-doped α-Fe 2 O 3 nanotubes possess excellent sensitive to ethanol, and the response value of Pr-doped α-Fe 2 O 3 nanotubes to 10 ppm ethanol is 21.3 at the operating temperature 240 °C, which is much higher than that of pure α-Fe 2 O 3 nanotubes (1.5). That is to say that the ethanol sensitive of α-Fe 2 O 3 nanotubes is improved remarkably by doping Pr. Moreover, Pr-doped α-Fe 2 O 3 nanotubes show good selectivity and long-term stability.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2016
·Vol. 23
·期 4
·1-10
·
IF 1.969
Xiao Xiane,Lu Shaorong,Pan Lulu,Zeng Cen,He Zihai,Gao Jian,Yu Jinhong
We reported a novel approach for epoxy composites by incorporation of hyperbranched polyglycerol (HPG) grafted sisal cellulose fibers (SCF). In this work, we have synthesized SCF wrapped HPG shell (SCF-g-HPG) by a “grafting from” strategy for the strong interfacial interaction between fillers and matrix. It was found that the thermal and mechanical properties of epoxy composites were greatly improved by incorporating SCF-g-HPG. For example, the impact strength, flexural strength, tensile strength, Young’s modulus and toughness of the composites with 3.0 wt% SCF-g-HPG loading were 38.35 KJ/m 2 , 123.40 MPa, 86.62 MPa, 151.7 MPa, and 417.84 MJ/m 3 , significantly increased by 119.1 %, 55.2 %, 45.6 %, 43.1 %, and 166.1 % respectively, as compared with neat epoxy. In addition, thermal stability of SCF-g-HPG/epoxy composites also showed an obvious enhancement compared with neat epoxy.
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高影响因子
IRANIAN POLYMER JOURNAL
·
2017
·Vol. 26
·期 7
·531-539
·
IF 1.422
Sun Yujun,Jiang Xiancai,Hou Linxi
Quaternized poly(vinyl alcohol)/chitosan (QPVA/CS) composite membranes were prepared by solution casting method with AlCl 3 ·6H 2 O aqueous solution as solvent for CS and glutaraldehyde as a crosslinker. The crystalline, thermal and mechanical properties of the QPVA/CS composite membranes were studied by Fourier transform infrared spectroscopy, X-ray diffractometry, differential scanning calorimetry, thermogravimetry and tensile test measurements, respectively. The composite membranes were immersed in potassium hydroxide aqueous solution to form polymer electrolyte membranes. The alkaline uptake, swelling ratio, ion conductivity and methanol permeability of the electrolyte membranes were studied. The experimental results indicated that aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) had a positive effect on the mechanical properties of the QPVA/CS composite membrane. The elongation-at-break of this membrane reached the maximum of 401.0%. The alkaline uptake and swelling ratio of the composite membranes decreased. With the addition of 30 wt% AlCl 3 ·6H 2 O, the composite membrane showed the ion conductivity and methanol permeability of 1.82 × 10 −2 S cm −1 and 2.17 × 10 −6 cm 2 s −1 , respectively. These values were higher than those of the membrane with acetic acid as the solvent for CS. The selectivity of the QPVA/CS membrane could reach 8.39 × 10 3 S s cm −3 . This study showed that with AlCl 3 ·6H 2 O as the solution for CS, the high performance QPVA/CS composite alkaline polymer electrolyte membrane could be prepared.
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高影响因子
CHROMATOGRAPHIA
·
2017
·Vol. 80
·期 8
·1179-1188
·
IF 1.402
Li Ben,Guo Wei,Chi Haijun,Kimura Masaru,Ramsey Edward D.
A high-pressure photochemical reaction cell operated with a magnetic stir drive has been directly interfaced on-line with either SFC or HPLC. The interface consisted of an oven housing a recirculation pump directly connected to a sample injection valve. The inlet of the recirculation pump and the outlet from the sample injection valve were connected to the stirred reaction cell such that a return flow circuit was established. With this arrangement, a continuous flow of fresh supercritical fluid photochemical reaction mixture was maintained through the sample injection valve. This enabled samples of reaction mixture to be conveniently analyzed at regular intervals to monitor reaction progress using either on-line SFC or HPLC. The photoreduction of benzophenone in the presence of propan-2-ol to produce 1,1,2,2-tetraphenylethane-1,2-diol and 2-methyl-1,1-diphenylpropan-1,2-diol was studied. For this reaction, on-line SFC provided significantly better performance than on-line HPLC and was therefore used to monitor overall reaction progress and the different product yields. Quantitative results for this study demonstrate that highly efficient photochemical reactions proceeded in supercritical fluid carbon dioxide at 13 and 20 MPa.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2017
·Vol. 129
·期 3
·1875-1885
·
IF 1.953
Cheng Jian,Zheng Yu,Li Zhenming,Liu Zuliang,Li Lixia,Zhao Fengqi,Xu Siyu
Abstract The purpose of this work was to study the catalytic reaction and its mechanism of ammonium perchlorate (AP) with cobalt complex of 2,6-diamino-3,5-dinitropyrazine-1-oxide (Co-LLM-105) during thermal decomposition process. At first, the catalytic performance of Co-LLM-105 on the thermal decomposition of AP was investigated by TG–DSC, TG-FTIR, non-isothermal kinetic and α – T kinetic curves analyses. Secondly, the thermal decomposition mechanism of Co-LLM-105 in the absence and presence of AP was proposed based on TG, DTG, DSC and thermolysis/RSFTIR analyses. The results showed that Co-LLM-105 exhibited excellent catalytic activity on the thermal decomposition of AP. Meanwhile, AP also exhibited some catalytic effects on the thermal decomposition of Co-LLM-105. Both of the components had catalytic effects on each other during the process. The formation of active CoCO 3 , Co 3 O 4 , CoO and Co(NH 3 ) 6 (ClO 4 ) 2 in situ in the system accounted for the higher catalytic activity of Co-LLM-105 for the thermal decomposition of AP was deduced. Graphical Abstract Co-LLM-105 exhibited excellent catalytic activity on the thermal decomposition of AP. Meanwhile, AP also exhibited some catalytic effects on the thermal decomposition of Co-LLM-105. Both of the components had catalytic effects on each other during the process.
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高影响因子
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
·
2017
·Vol. 70
·期 8
·2175-2183
·
IF 0.533
Luo Song,Jie Xiaohua,Zheng Qiongbin,Zhang Liuyan,Wu Huishu,Huang Xiaoye
In this work, we have presented a detailed study on the effect of shot peening on anodization of medium carbon steel. Anodization has been conducted on both non-shot-peened and shot-peened steel. The results show that shot peening procedure facilitates the subsequent anodization significantly. The mechanism for promoting anodization by shot peening has been discussed. After anodization, the shot-peened steel forms an amorphous α-Fe 2 O 3 film with a geometric pattern. More importantly, the α-Fe 2 O 3 film and the shot-peened layer constitute an anodized shot-peened layer, which exhibits a multi-scale structure. Due to this multi-scale structure, the anodized shot-peened layer shows a controllable wettability. It can be used as a hydrophilic or a hydrophobic coating.
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 3
·961-968
·
IF 4.58
Dong Tiantian,Tang Qinghui,Zhao Kang,Deng Anping,Li Jianguo
The authors describe a dual signal amplification electrochemiluminescent (ECL) immunoassay for ultrasensitive determination of the β-adrenergic agonist salbutamol (SAL). It is based on the use of gold nanoparticles (AuNPs) and silica-coated quantum dots of the type CdSe@SiO 2 . The CdSe@SiO 2 nanoparticles (NPs) were synthesized by water-in-oil reversed-phase microemulsion. Amino-modified NPs were then prepared and used as an ECL signal probe for detection of SAL in the presence of K 2 S 2 O 8 . The gold NPs with their large specific surface carry the antigen, facilitate electron transfer and improve the electrochemical reaction efficiency of QDs and K 2 S 2 O 8 . The ECL immunosensor was fabricated by coating the AuNPs with antigen, and then SAL competed with SAL antigen for the binding sites of the antibody on the CdSe@SiO 2 NPs. Under optimized conditions, the ECL intensity is linearly related to the logarithm of the SAL concentration in the range from 0.001 to 1000 ng mL −1 , with a lower detection limit of 0.17 pg mL −1 (at an S/N ratio of 3). The assay has good operational stability, is highly sensitive and selective. It is judged to possess a wider scope in that it may be applied to many other small molecule analytes for which adequate antibodies are available.
Schematic of a dual signal amplification electrochemiluminescent immunoassay for ultrasensitive detection of the β-adrenergic agonist salbutamol based on the use of gold nanoparticles and CdSe@SiO 2 .
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2017
·Vol. 24
·期 2
·1-9
·
IF 1.615
Ji Pinjun,Guo Lihua,Hu Xiaohui,Li Weimin
A series of salicylaldimine ligands 2-tert-butyl-6-((2,4-bis(diphenylmethyl)-8-arylnaphthalen)imine)-phenol ( L1 : Aryl =4- t Bu-phenyl; L2 : Aryl = p-tolyl; L3 : Aryl = phenyl; L4 : 4-CF 3 -phenyl) and the corresponding neutral salicylaldimine nickel complexes ( Ni1 - Ni4 ) were prepared and characterized. In ethylene polymerization at 20 °C, these nickel complexes are highly active, with activities of up to 6.88 × 10 5 g·mol −1 ·h −1 . Moreover, the molecular weight of the polyethylene could reach up to 8.1 × 10 5 . Comparing with the classic salicylaldimine nickel complexes Ni5 at 20 °C, complexes Ni1 with the 4- t Bu-phenyl substituent demonstrated 8 times higher activity and 35 times higher polyethylene molecular weight.
Graphical abstract
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2017
·Vol. 24
·期 6
·1-11
·
IF 1.615
Xia Shan,Gao Yang,Yu Zhe,Duan Lijie,Gao Guang Hui
A novel pH-sensitive charge reversal and self-fluorescent polymeric micelle is designed and synthesized successfully. The smart micelle is prepared based on MPEG-polyurethane multi-block copolymer, which is synthesized by polycondensation, with 1, 4-bis (hydroxyethyl) piperazine (HEP) and hydroxyl-sulfamethazine (Hydroxyl-SM) as pH-sensitive molecules and fluorescein isothiocyanate (FITC) as fluorescent segment. The resulting MPEG-polyurethane multi-block copolymer is examined by 1 H–NMR, UV-vis spectra, fluorescence spectra and an acid-base titration. Moreover, the diameter, morphology and cytotoxicity of obtained polymer micelle are measured by dynamic light scattering (DLS), transmission electron microscopy (TEM) and MTT assay. The results indicate that the micelle has a small diameter of less than 200 nm and can remain unchanged within two weeks. Zeta-potential measurement shows that the negative charge of micelle can switch into positive charge as the pH value decreasing from 9.0 to 3.0. Subsequently, the fluorescence intensity decreases significantly with the reducing of pH values. The MTT assay shows the low cytotoxicity and good biocompatibility of the MPEG-polyurethane polymeric micelles. Finally, doxorubicin (DOX) is loaded into micelles to detect in vitro release behavior. The drug loaded micelles show a faster release behavior at pH 5.0 than that at pH 7.4. Therefore, the pH-sensitive charge reversal and self-fluorescent micelle can be a potential smart carrier for delivery and controlled release of protein drug.
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高影响因子
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