SENSORS
·
2018
·Vol. 18
·期 10
·3358
·
IF 2.475
Xuemei Wu,Xiaoqing Bai,Yang Ma,Jie Wei,Juan Peng,Keren Shi,Huiqin Yao
In this work, binary hydrogel films based on carboxylated multi-walled carbon nanotubes/poly(N,N-diethylacrylamide) (c-MWCNTs/PDEA) were successfully polymerized and assembled on a glassy carbon (GC) electrode surface. The electroactive drug probes matrine and sophoridine in solution showed reversible thermal-, salt-, methanol- and pH-responsive switchable cyclic voltammetric (CV) behaviors at the film electrodes. The control experiments showed that the pH-responsive property of the system could be ascribed to the drug components of the solutions, whereas the thermal-, salt- and methanol-sensitive behaviors were attributed to the PDEA constituent of the films. The CV signals particularly, of matrine and sophoridine were significantly amplified by the electrocatalysis of c-MWCNTs in the films at 1.02 V and 0.91 V, respectively. Moreover, the addition of esterase, urease, ethyl butyrate, and urea to the solution also changed the pH of the system, and produced similar CV peaks as with dilution by HCl or NaOH. Based on these experiments, a 6-input/5-output logic gate system and 2-to-1 encoder were successfully constructed. The present system may lead to the development of novel types of molecular computing systems.Keywords:electrocatalysis;encoder;logic gate;matrine;sophoridine
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DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2014
·Vol. 8
·期 3
·312-319
·
IF 0
Tan Ming,He Gaohong,Dai Yan,Wang Rujie,Shi Wenhua
The ternary phase diagrams of polyetherimide (PEI)/ N,N -dimethylacetamide (DMAc) with H 2 O and BuOH as non-solvent were simulated using solubility parameter and Flory-Huggins theory. The phase diagrams show that 5.5% H 2 O/BuOH system containing 5% BuOH and 0.5% H 2 O, or 6.5% H 2 O/BuOH system containing 6.2% BuOH and 0.3% H 2 O is required to induce liquid-liquid demixing for 20 wt-% PEI/DMAc casting solution. Therefore, BuOH can enhance the phase separation of the PEI casting solution and hereby induce higher porosity of the membrane, and the diffusion of BuOH into the water coagulation bath causes larger pore size easily compared with DMAc. Our predictions that the membrane pure water flux first increases then decreases, and the rejection ratio of bovine serum albumin decreases with the increasing concentration of BuOH were validated by the experiments using the prepared membranes.
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Applied Materials Today
·
2019
·
IF 8.013
Linghui Zhang,Qisheng Sun,Youkui Xu,Lili Han,Qian Wang,Yangchun Yu,Zhiwen Jin,Shikuan Yang,Zhipeng Ci
Fabrication of ultrathin ( e.g. , ∼2 nm) CsPbBr 3 nanowires is still challenging for existing methods, for the extremely fast crystal growth process of CsPbBr 3 . Here, we developed a self-assembled nanotemplate-confined growth concept to prepare ultrathin CsPbBr 3 nanowires. During electrospinning using the N , N -dimethylformamide (DMF) solution composed of polymethyl methacrylate (PMMA), PbBr 2 , CsBr, and capping agents, PMMA chains would assemble into nanochannels acting as nanotemplates within the electrospun PMMA fibers. Owing to the very limited amount of precursors within the nanochannels, ultrathin CsPbBr 3 nanowires were prepared after DMF evaporation. The CsPbBr 3 nanowires within the PMMA fibers or dispersed in toluene showed bright blue luminescence. The structure of the CsPbBr 3 products could be adjusted by the stirring time, as well as the amount of PMMA, PbBr 2 , and CsBr in DMF. Overall, we developed a new method towards engineering ultrafine CsPbBr 3 nanostructure through self-assembled template-confined growth concept during electrospinning, which may find potential applications in blue light emitting diodes and other optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Huimin Hao,Ji-Long Shi,Hui Xu,Xia Li,Xianjun Lang
TiO 2 is the most established semiconductor photocatalyst . The prominence of TiO 2 is becoming increasingly obvious because its interfacial redox reactions have implication on a wide range processes such as energy conversion and environmental remediation. Herein, we exploited the surface complex created by the interaction between organic molecules with binding sites and accommodating surface of TiO 2 for visible light-driven selective aerobic oxidation reactions. A novel surface complex formed between N -hydroxyphthalimide (NHPI) and TiO 2 was discovered. The NHPI-TiO 2 complex turned out to be an outstanding visible light photocatalyst and was successfully used in the selective oxidation of amines into imines with atmosphere O 2 under blue LED irradiation. The stability of the NHPI-TiO 2 complex was preserved by 3 mol% of (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) acting as a cooperative catalyst. Moreover, selectivities for the imine products were also promoted by TEMPO. Superoxide anion radical (O 2 − ) were evidenced to be the primary reactive oxygen species (ROS) to execute the oxidative conversions. This work suggests that TiO 2 surface complexes can be robust photocatalysts for visible light-driven selective aerobic reactions, provided that an appropriate cooperative redox catalyst exists to channel the photocatalytic electron transfer.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 7
·1-12
·
IF 2.278
Zhao Lianhong,Yan Xiufang,Jie Zhiqiang,Yang Hong,Yang Shiping,Liang Jie
Regenerable antimicrobial N -halamine/silica hybrid nanoparticles (NPs) containing chlorinated 5,5-dimethylhydantoinyl (Cl-DMH) groups, Cl-DMH/SiO 2 hybrid NPs, have been prepared by a co-condensation reaction between N -(3-triethoxysilylpropyl)-5,5-dimethylhydantoin (TS-DMH) and tetraethoxysilane (TEOS) and then a chlorination reaction in NaClO solution. The as-synthesized Cl-DMH/SiO 2 NPs were characterized by transmission electron microscopy, Scanning electron microscopy, X-ray photoelectron spectra, Specific surface area, Differential scanning calorimetry, and Fourier transform infrared. Experimental results showed that the size of the as-synthesized Cl-DMH/SiO 2 NPs could be well adjusted by changing the mass ratio of TS-DMH/TEOS and the volume ratio of 28 % NH 4 OH/H 2 O. Antimicrobial tests showed that the as-prepared Cl-DMH/SiO 2 hybrid NPs had excellent antimicrobial activities against both Escherichia coli and Staphylococcus aureus . The minimum inhibitory concentration and minimum bactericidal concentration values of the as-prepared Cl-DMH/SiO 2 hybrid NPs are 15 and 20 μg/mL for S. aureus , 25 and 30 μg/mL for E. coli , respectively. Paper disk diffusion assay showed that smaller-sized Cl-DMH/SiO 2 hybrid NPs have bigger inhibition zone diameters, indicating stronger antimicrobial efficacies. Also, the storage stability and regenerability of Cl-DMH/SiO 2 hybrid NPs were investigated.
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高影响因子
Chemistry-An Asian Journal
·
2016
·Vol. 11
·期 24
·3528-3533
·
IF 4.592
Shi Huang,Wenquan Zhang,Tianlin Liu,Kangcai Wang,Xiujuan Qi,Jiaheng Zhang,Qinghua Zhang
Graphical Greener rocket fuels : A series of N -alkylimidazole borane compounds has been synthesized, which display hypergolic reactivity with the oxidizer of white fuming nitric acid. Compared with popular hypergolic ionic liquids, these fuels have the advantages of low viscosity and cost-effectiveness, and easily scaled-up production. Over the past few decades, toxic and highly volatile hydrazine derivatives have been the main fuel choices for liquid bipropellants, especially in traditional hypergolic rocket engines. The search for new hypergolic fuels as replacements for hydrazine derivatives is of great interest to researchers. In this study, a series of N -alkylimidazole borane compounds has been synthesized and characterized. Interestingly, these compounds display promising applications as potential hypergolic fuels owing to their excellent physiochemical properties including low melting points, high thermal stability, low viscosities, and unique hypergolic reactivity. Compared with popular hypergolic ionic liquids, the cost-effective and scaling-up advantages of these materials highlight their promising potential as high-performance fuels in liquid bipropellant formulations.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Suxiang Ma,Junwei Wang,Kui Feng,Hao Zhang,Ziang Wu,Yimei Wang,Bin Liu,Yongchun Li,Mingwei An,Raúl Gonzalez-Nuñez,Rocío Ponce Ortiz,Han Young Woo,Xugang Guo
The development of n-type organic semiconductors critically relies on the design and synthesis of highly electron-deficient building blocks with good solubility and small steric hindrance. We report here a strongly electron-deficient dithienylpyrazinediimide (TPDI) and its n-type semiconducting polymers. The pyrazine substitution leads to the resulting polymers with much lower-lying lowest unoccupied molecular orbital (LUMO) levels and improved backbone planarity compared to the reported dithienylbenzodiimide (TBDI)- and fluorinated dithienylbenzodiimide (TFBDI)-based polymer analogues, thus yielding n-type transport character with an electron mobility up to 0.44 cm2 V–1 s–1 in organic thin-film transistors. These results demonstrate that dithienylpyrazinediimide is a highly promising electron-deficient building block for constructing high-performance n-type polymers and the incorporation of pyrazine into imide-functionalized (hetero)arenes is an effective strategy to develop n-type polymers with deep-lying frontier molecular orbital (FMO) levels for organic optoelectronic devices.
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PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Yiyuan Ding,Xin Ren,Dong Chen,Fanjue Wen,Ting Li,Fei Xu
Rechargeable Mg batteries have the advantages of abundant reserves and high safety, but suitable inorganic cathodes are quite limited. Organic polymers break the hindrance of the inorganic Mg-storage crystal lattice and provide more selections, but the reports on organic rechargeable Mg battery cathodes are relatively few. Herein, high-capacity bipolar organic cathodes are developed for rechargeable Mg batteries. Poly(1,5-diaminoanthraquinone) with double polyaniline chains is used as a bipolar cathode. The carbonyl and amino groups are employed as the N-doping and P-doping centers, respectively, and the conjugated anthraquinone unit delocalizes the charge density change during the redox reactions. Considering the mass of Mg salt, the poly(1,5-diaminoanthraquinone) cathode provides a high corrected capacity of 267 mA h g–1 (non-corrected capacities of 297 mA h g–1) for bipolar reactions. Moreover, compared with the single-chained poly(1-aminoanthraquinone) (44% capacity maintained after 140 cycles), the double-chained poly(1,5-diaminoanthraquinone) shows a much better N-doping cycleability (97% capacity maintained after 300 cycles), as the double polyaniline chains enhance the structure stability during the Mg-storage reaction. The present study demonstrates the importance of a large conjugated double-chain structure to enhance the Mg-storage performance of organic polymers. It is also imagined that the bipolar organic materials with both of N- and P-dopings are a highly promising strategy for development of high-capacity organic Mg battery cathodes.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 25
·255501
·
IF 3.551
Huapeng Wang,Mingpeng Chen,Qian Rong,Yumin Zhang,Jicu Hu,Dongming Zhang,Shiqiang Zhou,Xinbo Zhao,Jin Zhang,Zhongqi Zhu,Qingju Liu
Xylene is a volatile organic compound which is harmful to the human health and requires precise detection. The detection of xylene by an oxide semiconductor gas sensor is an important research direction. In this work, Co3O4 decorated flower-like SnO2 nanorods (SnO2/Co3O4 NRs) were synthesized by a simple and effective two-step method. The SnO2/Co3O4 NRs show high xylene response (Rg/Ra = 47.8 for 100 ppm) and selectivity at the operating temperature of 280 °C, and exhibit high stability in continuous testing. The resulting SnO2/Co3O4 NRs nanocomposites show superior sensing performance towards xylene in comparison with pure SnO2 nanorods. The remarkable enhancement in the gas-sensing properties of SnO2/Co3O4 NRs are attributed to larger specific surface area and the formation of p–n heterojunction between Co3O4 and SnO2. These results demonstrate that particular nanostructures and synergistic effect of SnO2 and Co3O4 enable gas sensors to selectively detect xylene.
研究领域:
材料科学
·
环境科学
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高影响因子
JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2017
·Vol. 55
·期 6
·662-668
·
IF 0.984
Ma Xiaowei,Feng Fan,Yang Yang,Dang Xueping,Huang Jianlin,Chen Huaixia
Fe3O4@MIL-100 (MIL, Material Institut Lavoisier) core–shell magnetic microspheres were prepared and applied as the sorbent for the magnetic solid phase extraction (MSPE) of N,N-diethyl-m-toluamide (DEET) in baby toilet water for the first time. The synthesized magnetic metal–organic frameworks were characterized by transmission electron microscope, infrared spectroscopy and thermogravimetric analysis. The functionalized magnetic microparticles showed excellent dispersibility in aqueous solution. The MSPE conditions were investigated in detail. Under the optimized conditions, an MSPE–high performance liquid chromatography method for the determination of DEET was developed. The method was linear in the concentration range from 5 to 500 μg L−1 for DEET in baby toilet water and good linearity (r2 > 0.9998) was obtained for the calibration curve. The limit of detection was 1.5 μg L−1. Both the intra-day and inter-day precisions (relative standard deviations) were <3%.
研究领域:
分析化学
·
环境科学
·
材料科学
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·122011
·
IF 7.5
Di Jin,Yunpeng Zou,Yang Zhao,Shuai Chen,Shiwei Luo,Taotao Chen,Jinchuan Zhang,Jialin Chen,Jijie Li,Yuewen Mu,Wen-Yan Zan,Fengwei Zhang
Transition metal-nitrogen-carbon (M-N-C) catalysts show great promise for converting CO₂ into valuable fuels and chemicals via electroreduction (CO₂RR). Nonetheless, controversy remains regarding which specific MNₓ coordination structure in M-N-C catalysts governs CO₂RR performance. We synthesized a series of Ni-NOMC catalysts with high specific surface area and varying NiN₃-Pyr site loadings using SBA-15 as a template, employing a small molecule condensation and pyrolysis strategy. Aberration-corrected scanning transmission electron microscopy (AC-STEM) and X-ray absorption spectroscopy (XAS) confirmed the presence of atomically dispersed Ni sites coordinated by pyrrolic nitrogen (NiN₃-Pyr). The Ni-NOMC-3 catalyst, with a higher NiN 3 -Pyr loading, achieved a remarkable CO Faraday efficiency (FE CO ) of 99.6% at −0.57 V vs. the reversible hydrogen electrode (RHE), while maintaining FE CO > 99% across a broad potential window (−0.17 to −0.97 V vs. RHE). Moreover, the ordered mesoporous structure of this catalyst enhances mass transport properties and optimizes active site accessibility, enabling a high CO partial current density of 157 mA·cm⁻² in a flow cell system. Theoretical simulations further reveal that the NiN₃-Pyr coordination structure exhibits superior catalytic performance for CO₂RR-to-CO compared to other possible NiN x configurations.
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高影响因子
InfoMat
·
2019
·Vol. 1
·期 4
·542-551
·
IF 0
Yong Zhang,Xiaojie Xu,Xiaosheng Fang
The heterojunction photodetector between n-SrTiO 3 (n-STO) and p-CuS-ZnS (p-CZS) is prepared by a simple chemical bath deposition. The p-CZS/n-STO photodetector exhibits excellent self-powered characteristics under 390-nm light illumination, including high photosensitivity (on/off ratio of 300), fast response speed (0.7/94.6 ms), and good wavelength selectivity (410-380 nm). More importantly, the self-powered n-STO photodetectors can be regulated by varying the composition of CZS film (p-CZS, p-CuS, and n-ZnS). All devices exhibit a large open-circuit voltage and show different self-powered behaviors because of the different built-in electric fields. The open-circuit voltages of the CZS/STO, CuS/STO, and ZnS/STO devices are measured to be 0.56, 0.30, and 0.35 V, respectively. This work provides a simple and effective way to fabricate tunable self-powered photodetectors by varying the composition of the nanocomposite film.
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