CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 35
·期 6
·728-738
·
IF 1.692
Guo Ya-kun,Li Han,Zhao Peng-xiang,Wang Xiao-fang,Astruc Didier,Shuai Mao-bing
A self-healing and recyclable carbon tube/epoxy adhesive was prepared by epoxy monomer with Diels-Alder (DA) bonds, diethylenetriamine and polyethyleneimine modified multi-wall carbon nanotubes (MWCNTs). The self-healing and recyclable ability was attained by thermally reversible Diels-Alder reaction between furan and maleimide in the epoxy monomer. By controlling the molar ratio of furfuryl glycidyl ether and 4,4′-methylenebis( N -phenylmaleimide), the glass transition temperature and mechanical properties of MWCNTs/epoxy adhesives were varied. The self-healing properties of MWCNTs/epoxy polymers were evaluated by lap shear experiment and the results showed that the MWCNTs/epoxy adhesives exhibited enhanced mechanical properties and excellent self-healing ability under heat stimulus. The healing efficiency was related to the molecule mobility and the conversion of DA reaction between furan and maleimide. The MWCNTs/epoxy adhesives also displayed excellent recyclable ability by transforming into soluble polymer under heating. These materials offer a wide range of possibilities to produce materials with healing and recyclable ability and have the potential to bring great benefits to our daily lives by enhancing the safety, performance, and lifetime of products.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 13
·8016-8026
·
IF 2.599
Yang Hongyu,Wen Chengwei,Tang Zhenghua,Wang Likai,Wang Qiannan,Yan Wei,Wu Wen,Chen Shaowei
Bio-inspired metal nanomaterials are receiving increasing research attentions in catalytic field recently, while peptide-based method represents new revenues to fabricate stable and reactive catalyst under mild and environmental friendly conditions. Among all kinds of noble metals, peptide-based palladium nanomaterials have demonstrated excellent catalytic capabilities in a variety of organic reactions. However, their electrocatalytic properties have not been systematically studied. Herein, R5-templated Pd nanomaterials have been fabricated and employed as potent catalysts for oxygen reduction reaction (ORR). The shape and morphology of these Pd nanomaterials were manipulated by tuning the metal-to-R5 ratio. The as-prepared Pd nanomaterials demonstrated excellent ORR activity in alkaline media. R5-Pd-90 exhibited the best activity which is superior than commercial Pt/C, in terms of onset potential, diffusion-limited current density as well as long-term stability. The correlation between the shape and/or morphology of the peptide-templated Pd nanomaterials and their ORR activity has been successfully established.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 35
·期 3
·400-406
·
IF 1.692
Wei Wan-chu,Feng Shuo,Zheng Cai-xia,Liang Guo-dong,Zhu Fang-ming
The fluorescently labelled polymers including pyrene-labelled polystyrene (PyPS) and pyrene-labelled poly(methyl methacrylate) (PyPMMA) with narrow molecular weight distributions were synthesized by the atom transfer radical copolymerization (ATRCP) of styrene or methyl methacrylate with 1-pyrenemethyl methacrylate (PyMMA). The ultrathin PyPS and PyPMMA films with the thickness ranging from 30 nm to 400 nm supported on the quartz slides were prepared by spin-coating. The fluorescent quantum yield (QY) of the pyrene probe in the ultrathin polymer films was investigated by the photoluminescence spectrometer using an integrating sphere detector. The QY decreased with the reduction of film thickness in the sub-200 nm range.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Yi Xin,Wu Yuxuan,Tan Guoxin,Yu Peng,Zhou Lei,Zhou Zhengnan,Chen Junqi,Wang Zhengao,Pang Jinshan,Ning Chengyun
Traced dopamine (DA) detection is critical for the early diagnosis and prevention of some diseases such as Parkinson’s, Alzheimer and schizophrenia. In this research, a novel self-supporting three dimensional (3D) bicontinuous nanoporous electrochemical biosensor was developed for the detection of dopamine by Differential Pulse Voltammetry (DPV). This biosensor was fabricated by electrodepositing palladium nanoparticles (Pd) onto self-supporting nanoporous gold (NPG) wire. Because of the synergistic effects of the excellent catalytic activity of Pd and novel structure of NPG wire, the palladium nanoparticles decorated NPG (Pd/NPG) biosensor possess tremendous superiority in the detection of DA. The Pd/NPG wire biosensor exhibited high sensitivity of 1.19 μA μΜ −1 , broad detection range of 1–220 μM and low detection limit up to 1 μM. Besides, the proposed dopamine biosensor possessed good stability, reproducibility, reusability and selectivity. The response currents of detection in the fetal bovine serum were also close to the standard solutions. Therefore the Pd/NPG wire biosensor is promising to been used in clinic.
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PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2017
·Vol. 83
·期 2
·308-314
·
IF 1.575
Wang Li,Li Yanhong,Shi Min,Ma Wenle,Cui Hongtao
Abstract In this work, nanosphere-like and nanowire shaped CeO 2 nanocrystals were prepared at room temperature utilizing the epoxide precipitation reaction in aqueous and ethanolic solutions. It was found that the shape of CeO 2 nanocrystals depends on the reaction kinetics of epoxide in solution. The isotropic growth of nanocrystals in aqueous solution resulted in the formation of CeO 2 nanocrystals with sphere-like shape, while the anisotropic growth of nanocrystals in ethanolic solution led to the nanowire shape of CeO 2 nanocrystals. The anisotropic growth of nanocrystals was attributed to the high surface energy of their {110} facet induced from the active reaction of epoxide in ethanolic solution. The reaction kinetics of epoxide affected not only the size and crystallinity of CeO 2 nanocrystals, but also their shape. As a result, the produced CeO 2 nanocrystals had different electrochemical performance. As an electrode material for application in supercapacitor, the nanosphere-like CeO 2 nanocrystals presented better electrochemical performance and longer cycle life than the packed CeO 2 nanowires. Graphical Abstract Nanosphere-like and nanowire shaped CeO2 nanocrystals were prepared utilizing the epoxide precipitation reaction in aqueous and ethanolic solutions. It was found that the shape of CeO2 nanocrystals depends on the reaction kinetics of epoxide in solution. The isotropic growth of nanocrystals in aqueous solution produced CeO2 nanocrystals with sphere-like shape, while the anisotropic growth of nanocrystals in ethanolic solution produced nanowire shaped CeO 2 . As an electrode material for application in supercapacitor, the nanosphere-like CeO 2 nanocrystals presented better electrochemical performance and longer cycle life than the packed CeO 2 nanowires.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 8
·2551-2559
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IF 4.58
Jiao Caina,Ma Ruiyang,Li Menghua,Hao Lin,Wang Chun,Wu Qiuhua,Wang Zhi
The authors describe the preparation of magnetic cobalt/nitrogen-doped carbon microspheres (Co-N/Cs) by combining a hydrothermal procedure with a carbonization process. The textures of the Co-N/Cs were investigated by powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, nitrogen adsorption-desorption isotherms and vibration sample magnetometry. The Co-N/Cs possess a high surface area and strong magnetism. This results in good adsorption capability and enables magnetic separation. The Co-N/Cs are shown to be an effective magnetic solid-phase extraction adsorbent for the enrichment of various phthalate esters (diethyl phthalate, diallyl phthalate and diisobutyl phthalate) from sport beverages and milk samples prior to their determination by HPLC. The limits of detection (at an S/N ratio of 3) are between 0.1–0.2 and 0.08–0.3 ng mL −1 for sport beverages and milk samples, respectively. The recoveries when extracting all the spiked samples varied from 80.3% to 116.2%.
Magnetic cobalt/nitrogen-doped carbon microspheres (Co-N/Cs) were prepared and used as an effective magnetic solid phase extraction adsorbent for the enrichment of phthalate esters from beverages and milk samples.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2016
·Vol. 408
·期 25
·7173-7180
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IF 3.125
Guo Weiwei,Zhang Amin,Zhang Xin,Huang Chusen,Yang Dapeng,Jia Nengqin
An electrochemiluminescence (ECL) sensor for bisphenol A was proposed by using l -cysteine-functionalized multiwalled carbon nanotubes/gold nanocomposites-modified glassy carbon electrode (MWCNTs-Au/GCE) based on ECL of peroxydisulfate solution. The ECL behaviors of peroxydisulfate solution had been investigated at the chitosan/MWCNTs-Au/GCE, and bisphenol A was found to have quenching effects on the ECL of peroxydisulfate solution. Both Au nanoparticles (AuNPs) and multiwalled CNTs could promote the electron transfer and synergetically amplify the ECL signal of peroxydisulfate solution. Under the optimized conditions, the ECL signal intensity was linear with the concentration of bisphenol A in the concentration range between 0.25 and 100 μM ( R = 0.9931) with a detection limit (S/N = 3) of 0.083 μM. The constructed ECL sensor has the advantages of simplicity, sensitivity, good selectivity, and reproducibility, exhibiting a great potential application in the determination of bisphenol A.
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JOURNAL OF NANOPARTICLE RESEARCH
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2016
·Vol. 18
·期 7
·1-9
·
IF 2.101
Wan Xuejuan,Li Shifeng,Zhuang Lulu,Tang Jiaoning
l -Tryptophan-capped carbon quantum dots ( l -CQDs) were facilely synthesized through “green” methodology, and the obtained material was utilized as a sensitive and selective fluorescence sensor for mercury ion (Hg 2+ ) in pure aqueous solutions. Carboxyl-functionalized CQDs were first green synthesized by a one-step hydrothermal route, and l -tryptophan was then attached to CQDs via direct surface condensation reaction in aqueous solution at room temperature. The as-synthesized l -CQDs had an average size of ca. 5 nm with a good dispersity in water, and exhibited a favorable selectivity for Hg 2+ ions over a range of other common metal cations in aqueous solution (10 mM PBS buffer, pH 6.0). Upon the addition of Hg 2+ , a complete fluorescence quenching (ON–OFF switching) of l -CQDs was evident from the fluorescence titration experiment, and the fluorescence detection limit of Hg 2+ was calculated to be 11 nM, which indicated that the obtained environmentally friendly l -CQDs had sensitive detection capacity for Hg 2+ in aqueous solution.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 19
·5261-5268
·
IF 3.125
Liu Yixi,Wang Yong,Liu Le,He Yonghong,He Qinghua,Ji Yanhong
A method to detect small molecules with a molecularly imprinted polymer/quantum dot (MIP-QD) chip using a home-built optical fluidic system was first proposed in this study. Ractopamine (RAC) was used as the model molecule to demonstrate its feasibility. The sensing of the target molecule is based on the quenching amount of the quantum dots. The method is facile, cost-saving, easy for miniaturization and avoids the cumbersome steps that are needed to get the fluorescent quenching curve using a spectrofluorometer. Most importantly, more details and accurate response time can be obtained by use of this method. The experimental results show that the prepared chips with low cost are highly selective and the home-built detection system allows the fast binding kinetics. The recorded quenching process was used to study the kinetic uptake of RAC onto the MIP-QD chip and the specificity towards RAC. The system can further be utilized to study the effect of the solvent, pH and temperature on the selectivity of the prepared MIP. The methodology could be extended to other similar studies with different molecules.
Schematic illustration of the molecularly imprinted polymer/quantum dot chip capturing the target molecule
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高影响因子
International Journal of Environmental Science and Technology
·
2017
·Vol. 15
·期 7
·1561-1572
·
IF 1.915
Wang L.,Ma L.,Yang Z.
Heavy metal contamination in polished rice grains collected from Hunan Province, Southern China, has been investigated in this study. The concentrations of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn in rice were determined by microwave-assisted digestion and inductively coupled plasma-mass spectrometry method. In order to evaluate the correlations among heavy metals, statistical analyses including Pearson’s correlation analysis, principal component analysis and hierarchical cluster analysis were performed. Three distinct clusters were classified by the hierarchical cluster analysis approach. In the principal component analysis, three principle components were extracted with the eigenvalue >1.0. The spatial distribution of heavy metals was predicted by the ordinary kriging interpolation. Cu and Ni with similar distribution patterns could be primarily originated from geogenic source. The hot-spot areas in the distribution patterns of Mn, Pb and Zn could be mainly related to mining and smelting activities. Cd and Co might be derived from the combination of natural existence and anthropogenic sources. The chronic non-carcinogenic effect on local rice consumers from exposure to heavy metals was estimated by the target hazard quotient. The average target hazard quotient values of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn were 1.754, 0.367, 0.003, 0.544, 0.165, 0.775, 0.228, 0.049 and 0.481, respectively. The target hazard quotient value of Cd exceeded the threshold value suggesting high potential health risk to residents in Hunan Province through rice consumption.
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Nano Research
·
2017
·Vol. 11
·期 1
·195-205
·
IF 7.354
Mei Xuan,Xu Simin,Hu Tongyang,Peng Liuqi,Gao Rui,Liang Ruizheng,Wei Min,Evans David G.,Duan Xue
Two-dimensional (2D) nanomaterials have gained tremendous attention in the field of biomedicine because of their high specific surface areas and fascinating physicochemical properties. Herein, 2D monolayered double hydroxide (MLDH) nanosheets were employed to localize doxorubicin (DOX), an anticancer drug, with a loading capacity of as high as 3.6 mg·mg –1 ( w / w ). Structural characterizations and theoretical calculations indicate that the DOX molecule is uniformly arranged and oriented at the surface of the MLDHs with a binding energy of 15.90 eV, showing significant electrostatic interaction. With the assistance of the targeting agent folic acid (FA), DOX-FA/MLDHs demonstrate targeted cellular uptake and superior anticancer behavior based on in vitro tests performed with cancer cells. In addition, this composite material exhibits a selective release toward cancer cells and good biocompatibility with normal cells, which would guarantee its practical applications in cancer therapy.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 7
·1296-1303
·
IF 1.113
Zhang Bin,Jiang Yujie,Han Jian
A flexible and stretchable three-dimensional nanocomposite membrane based on traditional cotton fabric is a promising alternative for proton exchange membrane because it has the capability of transferring protons, is inexpensive, and also have higher current density compared to Nafion membranes in microbial fuel cells. The obtained results showed that the highest power and current of PVAc-g-PVDF-coated cotton fabric were 400±10 mW/m 2 and 92 mA/m 2 , respectively. However, maximum generated power and current for Nafion-117 were 300±10 mW/m 2 and 60 mA/m 2 , respectively. The highest proton conductivity of PVAc-g-PVDF-coated cotton fabric was (1.5±0.2)×10 -2 S/cm at 25 °C and lowest glucose permeability was (12±1)×10 -6 cm 2 /s after Mg 2+ ions adsorption. Furthermore, the highest COD removal (85±3 %) and CE (11.2 %) were obtained from PVAc-g-PVDF-coated cotton fabric. The coated cotton fabric can provide a novel route for low-cost production of high-performance flexible proton exchange materials from the natural fabrics.
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