摘要：
Here we report a facile and cost-effective preparation of nickel nanoparticle S/Nitrogen-carbon nanohybrid (Ni NPS/N-C) based on formamide condensation and carbonization, used for highly sensitive and selective electrochemical determination of tryptophan (Trp) in practical samples. The crystallographic phase, surface morphology, elemental distribution, and chemical state of the Ni NPS/N-C nanohybrid were analyzed by XRD, SEM, TEM, EDS, XPS, FTIR, TGA and Raman spectra. The results show that high content of Ni NPs (6.62 wt%) were distributed in the nanohybrid, and a large number of bamboo-like nanotubes were formed during pyrolysis, which dramatically increases the specific surface area, and remarkably promotes the electrical conductivity as well as the catalytic activity of the nanohybrid. The electrochemical behavior of Trp was investigated on the nanohybrid modified carbon paste electrode (Ni NPS/N-C/CPE) and the measurement parameters were optimized. As expected, the modified electrode can remarkably enhance the electrochemical oxidation signal of Trp. Under the optimal experimental conditions, a linear relationship in the range of 0.01-20 mu M and 20-80 mu M for Trp was established with detection limit of 5.7 nM (S/N = 3). Finally, the proposed sensor was practically applied by evaluation and determination of Trp from various sourcing samples including human serum and pharmaceutical samples.
期刊：
Journal of Alloys and Compounds,2021年881:160667 ISSN：0925-8388
通讯作者：
Dong Qian
作者机构：
[Liu, Jinlong; Long, Xuanda; Zhang, Zhiliang; Su, Kanda; Qian, Dong; Guo, Jiangnan; Xu, Deyao] Cent South Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Liu, Jinlong] Univ Auckland, Sch Chem Sci, Auckland 1142, New Zealand.;[Tong, Haixia] Changsha Univ Sci & Technol, Inst Chem & Biol Engn, Changsha 410114, Peoples R China.;[Liu, Zeng] Cangzhou Dahua Grp Co Ltd, Cangzhou 061000, Peoples R China.
通讯机构：
[Dong Qian] H;Hunan Provincial Key Laboratory of Chemical Power Resources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China
摘要：
We rationally design and construct a heterostructured hybrid with reduced graphene oxide served as a platform to in-situ grow N-doped bamboo-like carbon nanotubes encapsulating bimetallic Co-Fe sulfide nanoparticles through a two-stage pyrolysis succeeded by an evaporating sulfurization process (denoted as CoxFe1-xS2@N-CNTs/rGO). By tuning the Co/Fe ratio, the optimal Co0.6Fe0.4S2@N-CNTs/rGO exhibits a remarkable oxygen evolution reaction (OER) performance in 1.0 M KOH, in which the overpotential at 10 mA cm(-2) and Tafel slope are recorded as 248 mV (vs. RHE) and 58.3 mV dec(-1), respectively, outmaneuvring commercial RuO2 and most Co/Fe sulfide-based catalysts in recent peer reports. Comprehensive experiment results unravel that the outstanding OER electrocatalytic performance owes to the reinforced synergy between CoS2 and FeS2, the heterostructures constituted by partial CoS2 and FeS2, the confining effect of N-CNTs/rGO for CoS2 and FeS2 nanoparticles, and the high conductivity and large surface of N-CNTs/rGO. (C) 2021 Elsevier B.V. All rights reserved.
作者机构：
[Sun, Junbin; Lu, Weihong; Chen, Mansheng; Chen, Ting; Li, Wenyi; Cao, Shengjun; Wang, Juan] Hengyang Normal Univ, Hunan Engn Res Ctr Monitoring & Treatment Heavy M, Hunan Prov Univ Key Lab Funct Organomet Mat, Key Lab Funct Met Organ Cpds Hunan Prov,Coll Chem, Hengyang 421008, Peoples R China.;[Wang, Jinshuang] Xinyang Normal Univ, Henan Prov Key Lab Utilisat Nonmetall Mineral Sou, Xinyang 464000, Peoples R China.;[Hui, Yu] Shenyang Acad Environm Sci, Atmospher Environm Res Ctr, Shenyang 110016, Peoples R China.
通讯机构：
[Junbin Sun; Weihong Lu] C;College of Chemistry and Material Science, Hengyang Normal University, Hunan Province Universities Key Laboratory of Functional Organometallic Materials, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Hunan Engineering Research Center for Monitoring and Treatment of Heavy Metals Pollution in the Upper Reaches of Xiangjiang River, Hengyang, 421008, PR China
作者机构：
[Wu, Yuyang; Liu, Bing; Chen, Mengdi; Jing, Qiangshan; Yu, Yongsheng; Chen, Luyao; Wang, Yinghui; Wang, Jinshuang] Xinyang Normal Univ, Henan Prov Key Lab Utilizat Nonmetall Mineral Sou, Xinyang 464000, Peoples R China.;[Sun, Junbin] Hengyang Normal Univ, Hunan Prov Univ Key Lab Funct Organometall Mat, Key Lab Funct Met Organ Cpds Hunan Prov, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Jinshuang Wang; Qiangshan Jing] H;Henan Province Key Laboratory of Utilization of Non-metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, 464000, China
期刊：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2021年168(9):096501 ISSN：0013-4651
作者机构：
[He, Quanguo; Deng, Peihong; Li, Junhua] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[He, Quanguo; Deng, Peihong; Li, Junhua] Hengyang Normal Univ, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.;[He, Quanguo; Deng, Peihong; Li, Junhua] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Hunan, Peoples R China.;[He, Quanguo; Wei, Yanping; Liu, Xia; Feng, Jinxia; Xiao, Jingyun] Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.;[He, Quanguo; Liu, Xia] Zhuzhou Peoples Hosp, Geriatr Rehabil Dept, Zhuzhou 421007, Peoples R China.
关键词：
ascorbic acid;acetaminophen;electrochemical detection;polyvinylpyrrolidone;acetylene black
摘要：
A new electrochemical sensor for the quick determination of both paracetamol (ACOP) and ascorbic acid (AA) was prepared using an acetylene black paste electrode modified with polyvinylpyrrolidone and graphene composite (PVP-GR/ABPE). Second derivative linear sweep voltammetry (SDLSV) and cyclic voltammetry (CV) were then used to investigate the electrochemical behavior of both ACOP and AA on this PVP-GR/ABPE. The results demonstrate that the two analytes have good resolution and strong electrochemical signal responses. Due to the interconnected effects of PVP, GR, and AB ternary composite, the designed electrode has several beneficial characteristicsincluding good adsorption ability, significant specific surface area, and good conductivity. The voltammetric responses of ACOP and AA on the PVP-GR/ABPE show that the modified electrode displayed good electrocatalytic properties for the chemical reactions of both ACOP and AA, with the linear range of 0.01-100 mu M for ACOP and the linear range of 6-1000 mu M for AA. The detection limits of 6.0 nM (ACOP) and 1.0 mu M (AA) were obtained, respectively. The sensor has successfully been used in the measurement of ACOP and AA in real samples, indicating that this method is potentially applicable for routine biomedical and chemical sensing in vitro diagnostically. (c) 2021 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
期刊：
Journal of Polymer Science,2021年59(1):100-107 ISSN：2642-4150
通讯作者：
Xiao, Lifen
作者机构：
[Xiao, Lifen; Huang, Geng; Li, Jie; Li, Wei; Li, Wenyi] Hengyang Normal Univ, Key Lab Funct Organometall Mat Hunan Prov Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Xiao, Lifen] H;Hengyang Normal Univ, Key Lab Funct Organometall Mat Hunan Prov Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
摘要：
Multiblock copolymer brushes have broad application in thermoplastic elastomers, drug delivery, porous materials, and nanolithography due to their unique structure and properties. In this research, a novel multiblock copolymer brush (PHEA-g-PEG)(x)-co- (PEG(23))(y) was synthesized by combining the efficient double strain-promoted azide-alkyne cycloaddition (DSPAAC) and copper-catalyzed azide-alkyne cycloaddition (CuAAC) click reactions. The gel permeation chromatography (GPC), proton nuclear magnetic resonance spectrometer (H-1 NMR), Fourier transform infrared spectroscopy (FT-IR), and atomic force microscopy (AFM) were used to characterize the prepared polymers. The results demonstrated that the novel multiblock copolymer brush was successfully prepared. The mole ratio was 1/0.84 between block PHEA-g-PEG and block PEG(23), and the grafting density was 100%. The AFM image showed the morphologies of cylinder, sphere, and beads on a string owning to the random distribution of PHEA-g-PEG and PEG.
期刊：
Journal of Structural Chemistry,2021年62(5):740-747 ISSN：0022-4766
通讯作者：
Y. Liu
作者机构：
[Yang, Y-Q; Li, W.; Chen, M-S; Fu, W-W; Liu, Y.] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang City, Peoples R China.
通讯机构：
[Y. Liu] K;Key Laboratory of Functional Organometallic Materials, College of Chemistry and Materials Science, Hengyang Normal University, Hengyang City, People’s Republic of China
摘要：
Two novel compounds [Zn(bitmb)(L)]center dot 2H(2)O and [Co(bitmb)(L)]center dot 2H(2)O are prepared under hydrothermal conditions (bitmb = 1,3-bis(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene; H2L = 1,3-bis-(4-carboxy-phenoxy)propane) and characterized by the single crystal X-ray diffraction analysis. Both complexes are isostructural and contain 3-fold right-handed helical 1D chains. IR and PXRD spectra, TG curves, and photoluminescent properties are also studied.
摘要：
Peroxynitrite (ONOO-) is closely associated with various pathophysiological processes and mainly produced within the mitochondria. Therefore, developing an efficient method for mitochondrial ONOO- detection is crucial for better understanding of its functions. In view of the advantages of ratiometric fluorescent probes and far-red/NIR fluorescent probes, a kind of novel mitochondrion-targeting ratiometric far-red fluorescent probe (ANI-DP) was reasonably constructed by employing isophorone derivative as fluorescence group, diphenyl phosphinate as response group, and pyridinium cation as mitochondria-targetable group. Probe ANI-DP displayed a distinctive ratiometric fluorescence response toward ONOO- with a red-shifted emision in far-red to NIR region owing to the cleavage of a phosphinate group and change of intramolecular charge transfer (ICT) efficiency induced by ONOO-. In 100 % aqueous solution, probe ANI-DP was capable of quantitatively detecting ONOO- levels ranging from 0 to 10 mu M with a low detection limit of 13.3 nM, and showed high specificity for ONOO- over other biological relevant substances. Besides, it featured large Stokes shift (202 nm), high photostability, low cytotoxicity as well as good mitochondria targetable ability. Encouraged by the outstanding properties described above, it was successfully applicated for ratiometric fluorescence imaging of ONOO- in mitochondria of living cells as well as visualization of ONOO- in zebrafish, which indicated that it holds great potential for revealing the functions of ONOO- in living biosystems.
摘要：
The corrosion behaviour of different planes of a selective laser-melted (SLM) equimolar CrCoNi mediumentropy alloy (MEA) was investigated and compared with its counterpart cast alloy in a 3.5 wt% NaCl solution. The microstructures of the SLM products were characterised, and electrochemical corrosion measurements, corrosion surface morphology observations, and X-ray photoelectron spectroscopy analyses were performed. Compared with the cast MEA, the SLM MEA has an inferior corrosion resistance for its more metallurgical defects and smaller grain size. In the SLM MEA samples, The XY-plane of the SLM MEA has a poorer corrosion resistance than the XZ-plane, which is due to more metallurgical defects and lack of fusion pores on the XY-plane and its higher grain boundary density. (C) 2020 Elsevier B.V. All rights reserved.
摘要：
Decreasing the particle size of Li2CO3 powder is beneficial for advancing its applications in the manufacturing of different materials and drug delivery. Therefore, in this study, a novel bottom-up process based on freezing is proposed for the production of nanoparticles. Herein, two methods of explosive nucleation were used: addition of an anti-solvent and rapid freezing. Explosive nucleation of Li2CO3 occurred during the initial stage of anti-solvent addition; in contrast, in the freezing method, it occurred at a stage when the solute, which had not migrated, was extruded to the solid-liquid interface. Li2CO3 concentration had an effect on both the crystal grain and particle size. The controlled preparation of Li2CO3 nanoparticles was achieved within a certain range of A/B ratio; when the ratio decreased from 10/0 to 10/20 v/v, the controlled synthesis of Li2CO3 nanoparticles was achieved. A lower concentration of Li2CO3 decreased the size of the crystal grain and increased the size of the particles, as observed via transmission electron microscopy and dynamic light scattering. When the A/B ratio (where A is saturated Li2CO3 solution and B is deionised water) was decreased below 10/20 v/v, the crystal grain size of Li2CO3 did not reduce significantly. To further understand the nucleation, freezing was carried out at two temperatures, i.e. 223 +/- 2 K and 267 +/- 2 K. The lower freezing temperature resulted in a smaller crystal grain size and more concentrated distribution.
期刊：
Chinese Journal of Structural Chemistry,2021年40(5):625-630 ISSN：0254-5861
作者机构：
[Deng Yi-Fang; Sheng Liang-Bing; Lu Wei-Hong; Sun Jun-Bin; Chen Man-Sheng; Zhang Chun-Hua] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.
关键词：
Fe complex;solvothermal synthesis;crystal structure;adsorption
摘要：
A Fe-based metal-organic framework, [Fe（INAIP）（DMF）]n·0.5nDMF（1）, has been synthesized by the reaction of 5-（isonicotinamido）isophthalic acid（H2INAIP） with FeSO4·7H2O under DMF reaction solvent. Single-crystal X-ray diffraction analysis indicates that complex 1 displays a two-fold interpenetrated three-dimensional（3D） framework with sra topology. The TG, magnetic and adsorption properties of the complex were also studied.
期刊：
Chinese Journal of Structural Chemistry,2021年40(4):507-511 ISSN：0254-5861
作者机构：
[Kuang Yun-Fei; Yang Ying-Qun; Zhu Xiao-Ming] Hunan Prov Coll, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Kuang Yun-Fei; Yang Ying-Qun; Zhu Xiao-Ming] Hunan Prov Coll, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Kuang Yun-Fei; Yang Ying-Qun; Zhu Xiao-Ming] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词：
europium(III) complex;crystal structure;fluorescent and magnetic properties
摘要：
A new europium(III) complex Eu(C20H14O3N)(3) (2,2'-bipy)(H2O)center dot H2O has been synthesized with 2-diphenylanine carbonyl benzoic acid and 2,2'-bipyridine as ligands. Crystal data for the complex are as follows: triclinic, space group P (1) over bar, a = 11.3334(5), b = 16.0883(7), c = 17.0116(8) angstrom, alpha = 70.411(4)degrees, beta= 82.435(4)degrees, gamma = 85.095(4)degrees, V = 2894.0(2) angstrom(3) , D-c = 1.484 g/cm(3) , Z = 2, mu = 1.15 mm(-1) , F(000) = 1320 and the final R= 0.0447 and wR = 0.0578. The Eu(III) ion is coordinated by nine atoms to give a monocapped square antiprism coordination geometry. The complex shows two intense fluorescence emission bands arising from the transitions of Eu3+ : D-5(0) -> F-7(1) (592 nm) and D-5(0) -> F-7(2) (616 nm), respectively. Also reported is the magnetic property of the complex. The complex exhibits antiferromagnetism in the temperature range of 300 similar to 2 K.
作者机构：
[Deng, Peihong; Li, Junhua] Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organomet Mat Hunan Prov Univ, Hengyang 421008, Peoples R China.;[He, Quanguo; Tian, Yaling; Wu, Yiyong; Xiao, Jingyun; Feng, Jinxia] Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.
通讯机构：
[Peihong Deng] D;[Quanguo He] S;School of Life Science and Chemistry, Hunan University of Technology, Zhuzhou 412007, China<&wdkj&>Department of Chemistry and Material Science, Hengyang Normal University, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Key Laboratory of Functional Organometallic Materials of Hunan Provincial Universities, Hengyang 421008, China
