POLYMERS FOR ADVANCED TECHNOLOGIES
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2019
·Vol. 30
·期 6
·1386-1393
·
IF 2.162
Chongyi Zhu,Dan Chang,Xiao Wang,Danxia Chai,Lili Chen,Alideertu Dong,Ge Gao
As a significant role in subcategory of halogen antibacterial field, amphiphilic N -halamine polymers show a promise as potential antimicrobials having a broad spectrum of microorganisms, long-term stability, and renewal of their antibacterial properties. By controlling the process parameters, electrospinning has been well recognized as a versatile and effective method being capable of making fibers and could be easily engineered with desired pore size and porosity to enhance the antimicrobial properties. The amphiphilic N -halamine P (ADMH-MMA-HEMA) terpolymer fibers showed efficient antimicrobial properties against both Gram-positive and Gram-negative bacteria within brief contact time. The result meant that the polymer fibers of macromolecular architecture with control of structural parameters such as hydrophobicity/hydrophilicity balance achievement improved antimicrobial activities via electrospinning technique. In vitro cytotoxicity study demonstrated that the polymer was biocompatible. As a result, the integration of amphiphilic antibacterial materials and the electrospinning technique provided us a feasible method to fabricate biocompatible antimicrobial products easily with low manufacturing cost and would be applied in many promising application areas.
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高影响因子
RARE METALS
·
2019
·
IF 1.785
Jiao Can,Sun Hao-Bo,Zhang Li,Zhao Shang-Qian,Pang Guo-Yao,Zhao Chun-Rong,Lu Shi-Gang
Abstract Lithium (Li) metal is the most promising electrode for next-generation rechargeable batteries. In order to push the commercialization of the lithium metal batteries, a kind of nitrogen(N)-doped composite graphene (NCG) adopted as the Li plating host was prepared to regulate Li metal nucleation and suppress dendrite growth. Furthermore, a new kind of sandwich-type composite lithium metal (STCL) electrode was developed to improve its application. The STCL electrode can be used as convenient as a piece of Li foil but no dendrite growth. In a symmetric battery, the STCL electrode cycled for more than 4500 h with the overpotential of less than 40 mV. And due to the creative design, the STCL promises the Li–S battery with a prolonged cycling lifespan. Graphical Abstract
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OPTICAL MATERIALS
·
2019
·
IF 2.687
Jiangyao Wu,Yan Dong,Xueyun Yang,Cheng Yao
The preparation of N-doped carbon dots (N-CDs) was facile and efficient by the hydrothermal method , using diethylenetriamine (DETA) and citric acid (CA) as nitrogen source and carbon source, respectively. The fluorescence of N-CDs was effectively quenched by Fe 3+ . Upon addition of hydroxylamine hydrochloride (HH) to N-CDs/Fe 3+ complex dispersion, the fluorescence of N-CDs was significantly recovered. Therefore, we developed an “off-on” fluorescence assay for the detection of HH using N-CDs/Fe 3+ as a fluorescence probe. The fluorescence intensity showed linearity with the added HH concentration ranging from 0 to 100 μM with the detection limit of 0.246 μM (S/N = 3). The proposed N-CDs sensing showed high selectivity and sensitivity to detection HH in aqueous solution.
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ACS Applied Bio Materials
·
2019
·
IF 0
Fei Wang,Mei Liu,Ruida Ding,Mingguang Liang,Liqian Huang,Jianyong Yu,Yang Si
Bioprotective materials with bactericidal activity could largely protect healthcare workers from being infected by emerging infectious diseases; however, creating such materials has turned out to be extremely challenging. Here, we fabricate a novel polysulfonamide (PSA) N-halamine electrospun nanofibrous membrane with rechargeable and rapid bactericidal properties by a Lewis acid-assisted chlorination process. The hydrogen bonds between PSA molecular chains can be weakened through Lewis acid–base complexation during chlorination, enabling more available amide groups to be chlorinated into N-halamine biocidal groups. The resulting nanofibrous membranes render intriguing features such as rechargeable chlorination capability (>4500 ppm), rapid bactericidal activity (6 log reduction of bacteria in 1 min), high particle removal efficiency (>99.8%), long-term durability, and ease of scalable production, which can be perceived as a functional layer of protective equipment that is capable of not only intercepting but also inactivating the pathogens effectively. The successful synthesis of the PSA N-halamine antibacterial nanomaterials opens new ways toward the development of bioprotective materials in a multifunctional and rechargeable form.
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PubMed
JOURNAL OF CATALYSIS
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2019
·
IF 7.723
Zhaolin He,Jin Liu,Qijun Wang,Meng Zhao,Zhipan Wen,Jun Chen,Devaraj Manoj,Chuyi Xie,Jiangbo Xi,Junxia Yu,Chunyan Tang,Zhengwu Bai,Shuai Wang
Eco-friendly carbocatalyst is extremely desirable in organic catalysis and wastewater treatment. Herein, we reported a one-pot synchronous hydrothermal process to synthesize a highly efficient N doped holey graphene (NHG) carbocatalyst, in which graphene oxide nanosheets are self-assembled, reduced, chemically etched, and simultaneously doped with nitrogen to form a graphene hydrogel in the presence of H 2 O 2 and NH 4 OH. Benefiting from the good hydrophilicity, unique hierarchical porous structure, large specific surface area (322.1 m 2 g −1 ), and high N content (9.77 at. %), the resultant NHG carbocatalyst exhibits an excellent catalytic performance for the hydrogenation of N-containing unsaturated compounds. In 4-nitrophenol reduction reaction, the NHG carbocatalyst delivers a turnover frequency of 3.32 × 10 −2 min −1 . This catalytic activity is superior to that of the commercial Pd/C (5.0 wt%), other previously reported carbocatalysts, and many noble-metal-based catalysts. Furthermore, the molecular structure analysis combined with density functional theory calculations elucidate metal-free catalytic mechanism of hydrogenation reaction for unsaturated chromophore groups in N-containing organic dyes.
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高影响因子
Jove-Journal of Visualized Experiments
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2018
·
IF 1.184
Ya-Min Du,Shen-Li Zheng,Li Liu,Josef Voglmeir,Gabriel Yedid
In recent years, the carbohydrate moieties of plants have received considerable attention, as they are a potential source of cross-reactive, allergy-provoking immune responses. In addition, carbohydrate structures also play a critical role in plant metabolism. Here, we present a simple and rapid method for preparing and analyzing N-glycans from different cultivars of radish (Raphanus sativus) using an N-glycanase specific for the release of plant-derived carbohydrate structures. To achieve this, crude trichloroacetic acid precipitates of radish homogenates were treated with PNGase H+, and labeled using 2-aminobenzamide as a fluorescent tag. The labeled N-glycan samples were subsequently analyzed by ultra performance liquid chromatography (UPLC) separation and matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry for a detailed structural evaluation and to quantify relative abundancies of the radish-derived N-glycan structures. This protocol can also be used for the analysis of N-glycans from various other plant species, and may be useful for further investigation of the function and effects of N-glycans on human health.
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PubMed
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 20
·2384-2389
·
IF 2.073
Yufeng Hu,Jie Liu,Junyu Li,Tao Chen,Minghuo Wu
Fluorescent magnetic molecularly imprinted polymers (FMMIPs) were prepared in a one-pot sol–gel polymerization process using Mn-doped ZnS quantum dots (QDs) as a fluorescent core, N-nitrosodiphenylamine (NDPhA) as a template, (3-aminopropyl) triethoxysilane (APTES) as a functional monomer, and tetraethylorthosilicate (TEOS) as a cross-linker. These FMMIPs could be used for sensing NDPhA based on their fluorescence quenching. The fluorescence intensity of the FMMIPs decreased as the concentration of NDPhA increased in the range of 0–120 μM, with a detection limit of 0.69 μM. The FMMIPs exhibited selectivity towards NDPhA over their structural analogs N-nitrosodiethylamine and sulfanilamide. Finally, the FMMIPs were successfully applied to detect NDPhA in tap water and seawater samples, and the average recoveries of NDPhA at different spiking levels ranged from 93.1% to 105.2% with relative standard deviations below 8.4%. This work provides a simple fabrication method for fluorescent magnetic MIP sensors, which can be used for the rapid determination and separation of nitrosamines from complex matrices.
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Journal of Energy Chemistry
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2018
·
IF 3.886
Jiandong Liu,Jiaojiao Liang,Caiyun Wang,Jianmin Ma
One-dimensional nano-structured materials have attracted attention due to its unique properties afforded such as the across-linked structures and large aspect ratios. In this work, one-dimensional CoSe@N-doped carbon nanofibers (CoSe@NC NFs) are successfully by combining the techniques of electrospinning and annealing. Selenium powder are directly dispersed in the polyacrylonitrile /N,N-Dimethylformamide (DMF) solution containing cobalt salt to form the product. The performance of these materials was investigated in Li-ion batteries after the annealing at different temperatures. The CoSe@NC nanofibers annealed at 550 °C (CoSe@NC-550) and displayed excellent storage properties, affording a high capacity of 796 mAh·g −1 at a current density of 1 A·g −1 for 100 cycles. Moreover, it is confirmed that the pseudocapacitive contribution of CoSe@NC-550 is up to 72.8% at the scan rate of 1 mV/s through the cyclic voltammetry analysis.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 9
·5621-5633
·
IF 3.917
Zhang Shengli,Kai Chengcheng,Liu Bofang,Zhang Silue,Wei Wei,Xu Xiaoling,Zhou Zuowan
Abstract Polyethylenimine (PEI), a type of water-soluble chain polymer containing a great number of primary, secondary and tertiary amine groups in the molecule, was used as an N-halamine precursor. It was grafted onto dialdehyde cellulose membrane (DCM) followed by chlorination to prepare a novel N-halamine antibacterial cellulose membrane (Cl–PEI–DCM). The appropriate conditions affecting the aldehyde content of DCM and the active chlorine (Cl + ) content of Cl–PEI–DCM were systematically studied at oxidation, grafting and chlorination stages, respectively. The structure and properties of the samples were investigated by SEM, ATR–FTIR, XRD, XPS, light transmittance measurements and tensile tests. The stability and rechargeability of the Cl–PEI–DCM were evaluated, and its antibacterial activity was tested against S. aureus and E. coli . Results showed that the Cl + content of the chlorinated samples was strongly dependent on the aldehyde content of DCM and PEI concentration. Under the optimum testing condition, the Cl + content of the Cl–PEI–DCM reached 1.30 wt%. The hydroxyl groups on the cellulose membrane were changed to aldehyde groups and the successful introduction of PEI and N–Cl bond were confirmed. The 1.30 wt% Cl–PEI–DCM exhibited high antibacterial activity against both S. aureus and E. coli , which can completely inactivate two bacterial pathogens within 5 min even after 15 days of storage. Moreover, the Cl–PEI–DCM membrane displayed good stability, rechargeability, transparency and high mechanical strength. These results demonstrated that the Cl–PEI–DCM can be considered as a visualized wound dressing material or antibacterial shoe insole. Graphical abstract
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高影响因子
LANGMUIR
·
2018
·
IF 3.789
Lili Zhang,Lei Liu,Xiaolin Hu,Yifeng Yu,Haijun Lv,Aibing Chen
Composite carbon materials with multiple morphologies (such as spheres/sheets and spheres/tubes) that combine the merits of both structures have a wide range of applications in electrochemistry, catalysis, energy storage, and so on. Therefore, the development of an efficient and simple method for preparing carbonaceous composite materials is a research hot spot. On the basis of the inhomogeneity of 3-aminophenol/formaldehyde (3-AF) polymerization spheres, the hollow 3-AF spheres were obtained after the dissolution of the internal 3-AF oligomer. The dispersed 3-AF oligomer was reassembled with silicate oligomers on the hard template of Mg(OH)2 sheets and hollow 3-AF spheres linked by CTAB through electrostatic force. The obtained N-MCS/HCS possessed both sheet and sphere structure, with a high specific surface area and uniform mesoporous distribution. As an electrode material, N-MCS/HCS exhibited a good specific capacity (270 F g–1 at the current density of 1 A g–1) and outstanding cycling life stability (96.3% after 5000 cycles) at a current density of 5 A g–1 and could be used as a new electrode material.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yu Wang,Fang Zhao,Jie Wang,Ali Raza Khan,Yulin Shi,Zhang Chen,Kaiqiang Zhang,Li Li,Yanfeng Gao,Xuhong Guo
VO2/PNIPAm hybrid thermochromic material has been verified as promising to improve optical performance of smart windows. However, VO2 can be easily oxidized especially when being dispersed in the hydrogel matrix, and also the nonuniform dispersion of VO2 in a host will worsen the material’s optical performance. Herein, pure VO2(M)@SiO2 nanoparticles (NPs) were first prepared using a surfactant-free method. Then VO2(M)@SiO2/PNIPAm hybrid microgels were synthesized through suspension polymerization. The VO2(M)@SiO2 NPs in the hydrogel matrix exhibited obviously improved resistance to oxidation. Monodispersed hybrid microgel with uniformly distributed VO2(M)@SiO2 NPs (Sample I) was obtained. Meanwhile, compared with the best VO2 film reported, our composite microgel (Sample III) demonstrated a 164% increase in the solar modulating ability at a relatively high average luminous transmittance (38.4%). All these remarkable features of VO2(M)@SiO2/PNIPAm microgel synthesized in our work will help a lot in the practical application of the inorganic–organic hybrid nanothermochromic materials.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2014
·Vol. 161
·期 12
·F1202
·
IF 2.859
Hui Wang,Qin Ma
A new nitrogen-doped carbon support for Pt-based electrocatalysts was prepared by carbonizing polypyrrole formed on the surface of WO3 nanoparticles (WO3-CNx). Morphologies of WO3-CNx and PtSn/WO3-CNx were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. PtSn nanoparticles were well-dispersed on the surface of WO3-CNx. Electrocatalytic results showed that PtSn/WO3-CNx is more active than PtSn/C in the ethanol oxidation reaction (EOR), since smaller PtSn nanoparticles were grown on the surface of WO3-CNx and highly electrically conductive WO3-CNx facilitated the electron transport occurred during the EOR. PtSn/WO3-CNx also exhibited better durability and higher stability in ethanol oxidation reaction than PtSn/C. These results indicated that WO3-CNx has potential to be used as a catalytic support with high-performance for Pt-based electrocatalysts used in fuel cells.
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