NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 24
·9652-9657
·
IF 3.069
Zhengnan Wang,Xingbo Ge,Zhihao Li,Jing Wu,Zihao Liang,Shuang Wang
Developing a robust earth-abundant metal electrocatalyst for the hydrogen evolution reaction (HER) in both alkaline and acidic electrolytes is essential for pursuing the highly-efficient conversion of sustainable energy resources. The Mo-doped NiCu electrode was fabricated as a HER catalyst via a one-step electrodeposition process. The structure and the chemical state of the deposited catalysts were characterized by X-ray power diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. This Mo-doped NiCu electrode (8 at% Mo-content in solvent) exhibits outstanding electrocatalytic activity for the HER in an alkaline electrolyte as compared to bimetallic NiMo and NiCu catalysts, with a small overpotential of 95 mV at a current density of 10 mA cm−2 and excellent electrochemistry stability.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2019
·Vol. 37
·期 6
·548-559
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IF 2.804
Xu Wei-Ke,Tang Jing-Yu,Yuan Zhang,Cai Cai-Yun,Chen Xiao-Bin,Cui Shu-Quan,Liu Peng,Yu Lin,Cai Kai-Yong,Ding Jian-Dong
Bacterial infection is a very troublesome issue in wound treatment, which stimulates exudate formation and severely delays the healing process. Herein, a thermogelling dressing system composed of two triblock copolymers of poly(D,L-lactic acid- co -glycolic acid)- b -poly(ethylene glycol)- b -poly(D,L-lactic acid- co -glycolic acid) (PLGA-PEG-PLGA) with different block lengths was developed to deliver teicoplanin (TPN), a glycopeptide antibiotic, for cutaneous wound repair. The TPN-loaded thermogel was a free-flowing sol at room temperature and formed a semi-solid gel at physiological temperature. In vitro studies demonstrated that the TPN-loaded thermogel system exhibited desired tissue adhesiveness and realized the sustained release of TPN in a fast-followed-slow manner for over three weeks. Furthermore, a full-thickness excision wound model in Sprague-Dawley (SD) rats was constructed to assess the efficacy of TPN-loaded thermogel formulation. Gross and histopathologic observations implied that treatment with the thermogel formulation reduced inflammation response, promoted disposition of collagen, enhanced angiogenesis, and accelerated wound closure and maturity of SD rats. The combination of the bioactivity of TPN and the acidic nature of the thermogel matrix was responsible for such an enhanced wound healing process. Consequently, the TPN-loaded PLGA-PEG-PLGA thermogel is a good candidate of wound dressing for full-thickness excision wound healing.
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Polymers
·
2019
·Vol. 11
·期 1
·86
·
IF 3.164
Rui Zhu,Renjie Chen,Yunxia Duo,Saigang Zhang,Delong Xie,Yi Mei
A simple and versatile route for industrial scale synthesis of adipicdihydrazide (ADH)/polymer hybrids with excellent performance of formaldehyde degradation is proposed in this paper. The ADH compound is uniformly dispersed in poly(methyl methacrylate-butyl acrylate-methacrylic acid) (P(MMA-BA-MAA)) latex, which is validated by UV and dispersibility tests. The results illustrate that ADH has excellent compatibility and dispersion stability without affecting the film formation of the polymer latex. Furthermore, scanning electron microscope (SEM) and mapping analysis of the hybrid films also demonstrate that ADH is homogenously dispersed in the polymer matrix. Compared with neat polymers, the thermal properties of hybrid films are improved, for example,T0.5increases by 8.3 °C. According to qualitative tests of the 4-amino-3-hydrazino-5-mercapto-1,2,4-triazol-red/green/blue (AHMT-RGB) method, the hybrid films demonstrate high formaldehyde removal efficiency. On the basis of the semi-quantitative test of Fourier Transform infrared spectroscopy (FTIR) measurements, the rate of formaldehyde degradation can reach 1.034 × 102mol/(h·m3) for the hybrid film with 5 wt% ADH.Keywords:adipicdihydrazide;formaldehyde degradation;polyacrylate latex;hybrid film
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 5
·2385-2391
·
IF 10.733
Fei Yan,Lina Yao,Kenxin Chen,Qian Yang,Bin Su
Artificial solid-state nanochannels are capable of regulating unipolar ion transport in their confined space and thus converting the Gibbs free energy stored in the salinity gradients to electricity. In order to achieve a large conversion efficiency, highly ion-selective and permeable nanochannel membranes are inevitably desired. In this work we report the salinity energy conversion using an ultrathin silica isoporous membrane (SIM, ∼90 nm in thickness) that consists of straight, uniform and close packed nanochannels (diameter, 2–3 nm; pore density, ∼4 × 1012 cm−2, corresponding to a porosity of 16.7%). Thanks to its unique structure and negatively charged surface, the SIM displayed excellent cation selectivity and meanwhile preserved a high ionic flux, and was capable of harnessing the osmotic energy efficiently upon mixing artificial seawater and river water. We rationalized the ion distribution inside the nanochannels in the presence of salinity gradients and the effect of the channel length on the energy conversion efficiency by finite element simulations. The simulated results suggest that short nanochannels with an ultrasmall dimeter of ∼2.3 nm and a length of ∼100 nm possess excellent cation selectivity. Both experimental and theoretical results suggest that the SIM is a highly potential material in salinity energy conversion.
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FOOD AND AGRICULTURAL IMMUNOLOGY
·
2019
·
IF 2.398
Shanshan Song,Steven Suryoprabowo,Liqiang Liu,Qiankun Zheng,Xiaoling Wu,Hua Kuang
A rapid, specific and sensitive method based an immunochromatographic strip test has been developed for the determination of sodium nifurstyrenate (NFS) residues in fish. Sample preparation procedure includes ultrasonic bath extraction with acetonitrile, sample centrifugation at 8000 rpm for 10 min, filtration through the 0.22 µm membrane filter, and drying over nitrogen (60°C) and res-suspension. The antigen (NFS-ovalbumin) and a goat anti-mouse IgG antibody were drawn onto a nitrocellulose membrane as the test line and control line, respectively. Under optimized conditions, the NFS cut-off limits for test strips was determined as 5 ng/mL in 0.01 M phosphate buffered saline and 10 ng/mL in fish. Results were obtained within 5 min. Our data suggests this immunochromatographic assay can be used for the sensitive, rapid, and specific on-site screening for NFS in fish.
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CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Tingwei Zhang,Wenzhi Li,Haosheng Xin,Lele Jin,Qiying Liu
An Al 3+ -modified formaldehyde-p-hydroxybenzenesulfonic acid resin catalyst (Al-SPFR) was synthesized through a hydrothermal method. N 2 adsorption–desorption experiment and acid–base titration revealed that the Al-SPFR catalyst had better texture properties and higher strong acid content than the previously prepared unmodified SPFR . The effects of reaction time and temperature, catalyst loading, and water content in water/GVL mixture were investigated for glucose dehydration using Al-SPFR as the catalyst. An HMF yield of 47.4% was obtained at 170 °C for 2 h in the biphasic GVL/H 2 O medium. Further performing a five-cycle experiment, the HMF yield initially decreased and then remained fairly constant, and the recyclability of the Al-SPFR was reasonable.
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BIOMATERIALS
·
2019
·
IF 10.273
Zhengjie Zhou,Yang Yan,Li Wang,Qiang Zhang,Yiyun Cheng
Photothermal therapy efficiently ablates tumors via hyperthermia but inevitably induces serious side effects including thermal damage to normal tissues, inflammations and enhanced risk of tumor metastasis. In this study, we fabricated a dual peptide decorated melanin-like nanoparticle for tumor-targeted and autophagy-promoted photothermal therapy in pursuit of improved cancer treatment. The multifunctional nanoparticle was composed of dual peptide RGD- and beclin 1-modified and PEGylated melanin-like polydopamine nanoparticles. Beclin 1-derived peptide modified on the nanoparticle up-regulated autophagy in cancer cells and further sensitized the tumors to photothermal ablation. RGD decorated on the particle surface enhanced the selectivity and cellular uptake of polydopamine nanoparticles by breast cancer cells. In vivo therapeutic experiments revealed that the tumor-targeted and autophagy promotion-associated photothermal therapy efficiently regressed tumors at a low temperature around 43 °C. The study provides a novel and efficient strategy to improve the efficiency of photothermal therapy via the up-regulation of autophagy in tumor cells.
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高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 12
·963
·
IF 3.504
Wei Liu,Xiaolian Zhu,Chengcheng Xu,Zhao Dai,Zhaohui Meng
A new AuNPs-based thermosensitive nanoreactor (SiO2@PMBA@Au@PNIPAM) was designed and prepared by stabilizing AuNPs in the layer of poly(N,N’-methylenebisacrylamide) (PMBA) and subsequent wrapping with the temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) layer. The new nanoreactor exhibited high dispersibility and stability in aqueous solution and effectively prevented the aggregation of AuNPs caused by the phase transformation of PNIPAM. The XPS and ATR-FTIR results indicated that AuNPs could be well stabilized by PMBA due to the electron transfer between the N atoms of amide groups in the PMBA and Au atoms of AuNPs. The catalytic activity and thermoresponsive property of the new nanoreactor were invested by the reduction of the environmental pollutant, 4-nitrophenol (4-NP), with NaBH4as a reductant. It exhibited a higher catalytic activity at 20 °C and 30 °C (below LCST of PNIPAM), but an inhibited catalytic activity at 40 °C (above LCST of PNIPAM). The PNIPAM layer played a switching role in controlling the catalytic rate by altering the reaction temperature. In addition, this nanoreactor showed an easily recyclable property due to the existence of a silica core and also preserved a rather high catalytic efficiency after 16 times of recycling.Keywords:nanoreactor;distillation precipitation polymerization;catalytic reduction;thermosensitive;AuNPs
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INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Guohui Li,Kun Jiang,Sher Zaman,Jinnan Xuan,Zhiqiang Wang,Fengxia Geng
Tuning the feature sizes and surface moiety groups of a two-dimensional (2D) sheet material has been regarded as the most effective strategy for achieving desired physical and chemical properties. The newly emerging transition-metal carbide or nitride sheets, generally referred to as MXenes, are of interest to the research community owing to their versatile behavior. While the chemical stability of MXenes is of pivotal importance to their real applications, a systematic study of examining the effect of their surface and lateral size on the resulting chemical stability is still lacking. Herein, by systematically varying the synthesis parameters, we obtained both regular and ultrasmall Ti3C2 sheets with different surfaces, namely, Al oxyanions or OH/F. To investigate the chemical stability and sustainability of each Ti3C2 sheet in an oxidizing environment, including an ambient atmosphere and a H2O2 medium, the evolution of phase, morphology, and optical behavior was carefully studied. The sheets covered with Al oxyanions had greater structural stability than those covered with the other species considered in this study, which may be due to the Al oxyanions acting like a shield and passivating the surface in the oxidizing atmosphere. Regarding the effect of feature size, thinner sheets or those with smaller lateral dimensions showed improved oxidation resistance, which could be due to the difficulty encountered in the structural recrystallization from Ti3C2 to oxidized product TiO2. This study provides a deeper understanding of MXenes and a method to efficiently engineer structures with desired performances.
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Journal of the Mechanical Behavior of Biomedical Materials
·
2019
·
IF 3.485
Jingmin Chen,Hongmei Yang,Jiusheng Li,Jinyang Chen,Yadong Zhang,Xiangqiong Zeng
Human skin interacts with various materials in our daily life. The interaction between human skin and contacting materials is very important for the development of skin contacting products. Owing to the ethic and different testing results because of the using of in vivo or ex vivo skin, it is important to develop an artificial skin model (ASM) for the study. Therefore, an ASM mimicking the deformation and friction behavior of in vivo human skin was designed based on the evaluation of in vivo human skin behavior, and its frictional interaction with wound dressings was studied. The ASM was prepared by the combination of hydrophilic network carboxyl chitosan (CC) and hydrophobic network polydimethylsiloxane (PDMS). The influence of ingredient ratio, including PDMS/CC and curing agent/PDMS ratio, on the mechanical property of ASM was determined firstly. By adjusting the curing agent/PDMS ratio, the water absorption swelling rate (WASR) of ASM could be controlled to mimic different hydration status of human skin. With the changing of ingredient ratio and hydration level, the elastic modulus and viscoelasticity of ASM can be tailored to be similar to that of in vivo human skin. When the PDMS/CC ratio was 7:3, and PDMS/curing agent ratio was smaller than 1:30, the elastic modulus of ASM was in the range of in vivo inner forearm, and with the increasing of indentation depth, the elastic modulus decreased. Based on the ASM, the frictional interaction between skin/wound dressing/mattress was studied. It was found that although the friction using ASM was slightly higher than that using in vivo inner forearm, but the friction decreasing trend was the same for different kinds of wound dressings. In addition, the friction tested with ASM was less fluctuation, more reliable and reproducible than that tested with in vivo skin, indicating that the ASM was suitable to be used for the studying of frictional interaction between skin and product, such as wound dressings.
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高影响因子
FUEL
·
2018
·
IF 4.908
Yun-Chuan Pu,Shui-Rong Li,Shuai Yan,Xiao Huang,Duo Wang,Yue-Yuan Ye,Yun-Quan Liu
Copper sintering at temperatures above 200 °C has been a big challenge for the application of copper-based catalysts in methanol reforming for hydrogen production. In the present work, a Cu/ZnO catalyst promoted by Sc 2 O 3 was developed, which is capable of converting methanol into hydrogen-rich gas with good activity and decent stability in the temperature range of 220–600 °C. The role of Sc in Cu/Sc 2 O 3 -ZnO catalysts was explored through the XRD, H 2 -TPR, N 2 O chemisorption, TEM, Raman, and XPS analyses. The results indicated that ZnO lattice was doped with the Sc 3+ ion, which led to increased metal dispersion, strengthened interaction between Cu metal and support oxide, and subsequently enhanced catalytic activity and stability of the Cu/Sc 2 O 3 -ZnO catalyst in methanol reforming for hydrogen production.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 7
·5802-5812
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IF 2.993
Zheng Boda,Zhu Qingsheng,Zhao Yang
In this work, we reported a facile approach to fabricate silver nanowire (AgNW) networks on flexible substrates. Through immersing the modified poly (ethylene terephthalate) with positively charged functional group into the AgNW dispersion with anionic dispersant, a flexible AgNW transparent conductive film was formed by electrostatic adsorption self-assembly process. Even without a post-treatment process, the as-prepared flexible AgNW films exhibited excellent optoelectrical property, low surface roughness and high reliability. It was shown that the insulating dispersant on AgNWs could be effectively removed by an ion bombardment method and then greatly decreased the sheet resistance of AgNW networks. Because of the nature of spontaneous adsorption, this preparation method can be suitable for an arbitrary shaped substrate, which will broaden the application of AgNW conductive films in optoelectronic devices.
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