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.
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.
作者机构：
[Tang, Siping; Gu, Biao; He, Shihui] Hengyang Normal Univ, Coll Chem & Mat Sci, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Li, Haitao; Wu, Cuiyan] Hunan Normal Univ, Coll Chem & Chem Engn, Key Lab Chem Biol & Tradit Chinese Med Res, Minist Educ, Changsha 410081, Peoples R China.;[Shen, Youming; Zhang, Chunxiang] Hunan Univ Arts & Sci, Coll Chem & Mat Engn, Hunan Prov Key Lab Water Treatment Funct Mat, Changde 415000, Peoples R China.
通讯机构：
[Siping Tang; Haitao Li] K;[Youming Shen] H;Hunan Provincial Key Laboratory of Water Treatment Functional Materials, College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde 415000, PR China<&wdkj&>Key Laboratory of Functional Organometallic Materials of College of Hunan Province, College of Chemistry and Materials Science, Hengyang Normal University, Hengyang 421008, PR China<&wdkj&>Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, PR China
关键词：
Fast response;Fluorescent probe;Imaging;Lysosome-targetable;Peroxynitrite
摘要：
Peroxynitrite (ONOO-) plays important roles in many pathophysiological processes and its subcellular detection draws increasing attention. In this study, we designed and prepared a novel lysosometargetable fluorescent probe (E)-2-(benzo[d]thiazol-2-yl)-4-methyl-6-((morpholinoimino)methyl)phe nol (BMP) for selective detection of ONOO- in living systems by incorporating a reactive morpholino hydrazone as new ONOO- response site into a benzothiazole derivative as fluorophore. After reaction with ONOO-, an obvious fluorescence increase (83-fold) was observed accompanied with distinct dual colorimetric and fluorescence changes. Probe BMP displayed the merits of fast response (<3 s), ultrasensitivity (LOD = 6 nM) and high selectivity towards ONOO- over other physiological species including ROS/RNS. Most importantly, the probe was capable of imaging ONOO- in lysosomes of living cells with good cell permeation and negligible cytotoxicity. Therefore, this research provides an effective tool to study the functions of ONOO- in lysosomes. (C) 2021 Elsevier B.V. All rights reserved.
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：
Two three-dimensional (3D) coordination polymers, viz. [Ni(INAIP)(Him)(H2O)]center dot H2O (1) and [Fe(INAIP)(H2O)(2)]center dot H2O (2), were synthesized by reaction of 5-(isonicotinamido)isophthalic acid (H(2)INAIP), NiSO4 center dot 6H(2)O/FeSO4 center dot 7H(2)O, and N-donor ligands, namely 1H-imidazole or 4,4 '-bipyridine, under hydrothermal conditions. Single-crystal X-ray diffraction analysis indicated that [Ni(INAIP)(Him)(H2O)]center dot H2O has a two-dimensional (2D) layer network structure with (6, 3) topology, while 2 shows a 3D fourfold interpenetrating framework with (10(3)-b) topology. The thermal stability and magnetic and adsorption behavior in solid state of the complexes were investigated in detail. Moreover, the photocatalytic degradation of methylene blue (MB) over complex 1 was studied.
摘要：
Double ceramic layer thermal barrier coatings (DCL-TBCs) of LaMgAl11O19/YSZ (LMA/YSZ) were prepared by atmospheric plasma spraying (APS). Composition, microstructure and phase stability of coatings were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and differential scanning calorimetry (DSC). The amorphous phase content of LMA coating increased with increasing the plasma gun current from 350 A to 650 A. The DCL-TBCs of LMA/YSZ whose LMA coating was prepared with a plasma gun current of 600 A (600LMA/YSZ) had the lower amorphous phase content, an excellent thermal insulation performance and the longest thermal cycling lifetime, indicating that properties of LMA coating could be largely improved by adjusting the APS conditions.
作者机构：
[Liu, Xing; Lai, Hua] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;Hengyang Normal Univ, Key Lab Funct Organometall Mat Coll Hunan Prov, Hengyang 421008, Peoples R China.
通讯机构：
[Xing Liu; Hua Lai] K;Key Laboratory of Functional Metal-Organic Compounds of Hunan Province & Key Laboratory of Functional Organometallic Materials of College of Hunan Province, Hengyang Normal University, Hengyang 421008, China
关键词：
Co-11(HPO3)(8)(OH)(6);Photocatalytic hydrogen evolution;Solar energy materials;Interfaces
摘要：
In the present work, cobalt phosphite Co-11(HPO3)(8)(OH)(6) was synthesized with a simple method, and its 3D flower-like structures and well crystallinity were characterized by SEM, XRD, XPS and IR. Co-11(HPO3)(8)(OH)(6) exhibit relatively high photocatalytic activity for hydrogen evolution reaction (HER) of 27.6 mu mol.h(- 1), with Eosin Y as a photosensitizer and triethanolamine (TEOA) as a sacrificial electron donor. The mechanisms of photocatalytic HER were discussed. This HER system consisting of only abundant elements is expected to contribute toward the development of low-cost and environmentally benign solar hydrogen evolution systems to meet the increasing future energy demand.
摘要：
The effects of the partial Y2O3 substituted by Gd2O3 on thermal and mechanical properties of ZrO2-Ta2O5-Y2O3 ceramics were studied. Results indicated the single stable tetragonal phase of zirconia co-doped with 16 mol% YO1.5 +16 mol% TaO2.5 (YTZ) and zirconia co-doped with (16-x) mol% YO1.5+ x mol% GdO1.5+16 mol% TaO2.5 (xGYTZ, x = 2, 4, 8) just existed at and above 1500 degrees C. The Gd2O3 substitution caused a decrease in phase stability when annealed at 1300 degrees C and 1400 degrees C. YTZ and 2GYTZ ceramics exhibited high fracture toughness, large thermal expansion coefficients (TECs), and low thermal conductivity. With the Gd2O3 substitution, the mechanical properties and thermal conductivity showed a decreasing trend, while TECs increased due to the decrease of crystal energy. The thermal durability of YTZ and 2GYTZ TBCs was evaluated. The cycling life of 2GYTZ TBCs was much shorter. The combination of sintering effect and thermal expansion mismatch stresses was significant factor for the failure.
摘要：
Tri(o-chlorobenzyl)tin 2,4,6-trimethylbenzoate (1) and tri(o-bromobenzyl)tin salicylate (2) were synthesized and characterized by elemental analysis, IR spectroscopy, NMR (H-1, C-13 and Sn-119), thermogravimetric analysis, and single-crystal X-ray diffraction. The initio calculation and in vitro anticancer activity test were performed for compounds 1 and 2. They are both single tin nucleus structures and the tin atoms were tetra coordinated in a distorted tetrahedral configuration; Compounds 1 and 2 showed stronger anticancer activity than cisplatin in human cervical cancer cells (Hela), liver cancer cells (HuH-7), non-small cell lung cancer cells (A549), lung adenocarcinoma cells (H1975) and breast cancer (MCF-7).
摘要：
In this work, a hierarchical doughnut-like Ni3S2@polypyrrole (PPy) core-shell heterostructure has been successfully constructed on nickel foam (NF) (denoted as Ni3S2@PPy/NF) through a facile hydrothermal followed by electrodeposition method. The coating of highly conductive and electroactive PPy layer on the backbone of Ni3S2@NF can significantly boost the integrated electrochemical performance. More specifically, the resultant Ni3S2@PPy/NF electrode achieves an extremely high specific capacitance of 3148.0 mF cm(-2) at a current density of 2.0 mA cm(-2), and a desirable rate capability. Further, an asymmetric all-solid-state supercapacitor is assembled using Ni3S2@PPy/NF as the positive electrode and activated carbon (AC)/NF as the negative electrode. Remarkably, the obtained Ni3S2@PPy/NF//AC/NF device delivers a high energy density of 46.4 Wh kg(-1) at a corresponding power density of 166.7 W kg(-1), outmaneuvering most sulfide- and PPy-based materials or their hybrids reported recently. Moreover, density functional theory calculations disclose the formation of N-Ni and C-Ni bonds at the PPy/Ni3S2 heterostructure interface and the enhancement of the binding of Ni3S2 towards OH- after PPy coating. Such exceptional supercapacitive properties of Ni3S2@PPy/NF owe to its unique porous interpenetrating structure, the combined contribution of both electroactive PPy and Ni3S2 components, highly-conductive PPy as well as the optimized electropolymerization and dopant of PPy.
摘要：
CeO2 and Sc2O3 co-stabilized ZrO2 ceramics have attracted much attention as potential thermal barrier coatings (TBCs) materials for applications above 1300 degrees C. In this study, a series of Sc0.04CexZr0.96-xO1.98 (SCZ, x = 0.08, 0.10, 0.12, 0.16) ceramic materials were synthesized with the solid-state method and their phase stability, microstructures and thermo-physical properties were systemically investigated by x-ray diffraction (XRD), Raman spectra, field emission scanning electron microscopy (SEM), thermal dilatometer, laser flash apparatus (LFA), and Vickers hardness tester. The results showed that Sc0.04Ce0.12Zr0.84O1.98 (4S12CZ) and Sc0.04Ce0.16Zr0.80O1.98 (4S16CZ) ceramic materials still maintained stable tetragonal phase structure after 100 h high temperature treatment at 1500 degrees C. SCZ had a high thermal expansion coefficient (TEC), low thermal conductivity, and high fracture toughness. The TEC of the ceramics increased with CeO2 addition because lattice energy reduced with increasing substitution of Zr4+ by bigger Ce4+ while thermal conductivity decreased due to the increase of lattice distortion. Compared with 4S12CZ, 4S16CZ exhibited a higher fracture toughness of 6.48 +/- 0.04 MPa m(1/2) and showed the better anti-sintering property. Besides, the thermal conductivity, TEC and thermal cycling lifetime of 4S16CZ were optimal. The comprehensive performance of 4S16CZ suggested it could be explored as a promising TBC material for high-temperature application.
期刊：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY,2021年253:119561 ISSN：1386-1425
通讯作者：
Biao Gu<&wdkj&>Youming Shen
作者机构：
[Shen, Youming; Liu, Qingheng; Zhang, Chunxiang] Hunan Univ Arts & Sci, Prov Engn Res Ctr Electroplating Wastewater Reuse, Hunan Prov Cooperat Innovat Ctr Construct & Dev D, Coll Chem & Mat Engn,Hunan Prov Key Lab Water Tre, Changde 415000, Peoples R China.;[Liu, Mengqin; Gu, Biao; Han, Lujiao] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat Coll Hunan Prov, Hengyang 421008, Peoples R China.
通讯机构：
[Biao Gu] K;[Youming Shen] P;Key Laboratory of Functional Organometallic Materials of College of Hunan Province, College of Chemistry and Materials Science, Hengyang Normal University, Hengyang 421008, PR China<&wdkj&>Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Hunan Province Cooperative Innovation Center for the Construction & Development of Dongting Lake Ecological Economic Zone, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde 415000, PR China
摘要：
Bisulfite (HSO3-) and sulfite (SO32-) are involved in numerous physiological processes of living systems. However, high levels of these substances are often correlated to many diseases. Herein, we designed and synthesized a simple full water-soluble colorimetric and far-red fluorescent probe (E)-1-methyl-4-(2-(1-methylquinolin-1-ium-3-yl)vinyl)quinolin-1-ium iodide trifluoromethanesulfonate (DQ) for HSO3-/SO32- detection by coupling 1,4-dimethylquinolinium with 3-quinolinium carboxaldehyde for the first time. The probe DQ showed high selectivity for HSO3- detection via a 1,4-nucleophilic addition reaction with distinct color changes from colorless to purple-red and remarkable far-red fluorescence enhancement in pure aqueous solutions. Specifically, the probe displayed a fast response (<15 s) for bisulfite, which renders it suitable for real time detection of HSO3-. Under the optimized conditions, the far-red fluorescence intensity was linear to the concentrations of HSO3- in the range from 0 to 25 mu M and the detection limit was as low as 0.11 mu M. Additionally, the probe could be applied to sense HSO3- on paper strips, real sample including vermicelli and sugar and image HSO3- in living cells, which indicated that probe DQ has potential application in food samples and living systems. (C) 2021 Elsevier B.V. All rights reserved.
期刊：
Journal of Food Composition and Analysis,2021年96:103708 ISSN：0889-1575
通讯作者：
He, Quanguo;Deng, Peihong
作者机构：
[Li, Guangli; He, Quanguo; Tian, Yaling; Wu, Yiyong; Xiao, Jinyun; Liu, Jun; Feng, Jinxia] Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.;[Tian, Yaling; Deng, Peihong; Wu, Yiyong; Li, Junhua; Xiao, Jinyun; Feng, Jinxia] Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Organometall Mat Hunan Prov Univ, Key Lab Funct Metal Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.
通讯机构：
[He, Quanguo; Deng, Peihong] H;Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.;Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Organometall Mat Hunan Prov Univ, Key Lab Funct Metal Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.
关键词：
Oxygen-functionalized multi-walled carbon nanotubes;Tyrosine;Acetylene black paste electrode;Voltammetric determination
摘要：
In this paper, acetylene black paste electrode (ABPE) was prepared and modified by oxygen-functionalized multi walled carbon nanotubes (MWCNT-COOH). The fabricated MWCNT-COOH/ABPE was further used for the investigation on the electrochemical behavior of tyrosine by cyclic voltammetry and second-order derivative linear sweep voltammetry. In 0.1 M pH 2.6 phosphate buffer solution, a well-defined anodic peak appeared at 924 mV, which was attributed to the electrooxidation of tyrosine on the modified electrode. The electrochemical parameters of tyrosine on the modified electrode were calculated. Under the optimal conditions, the oxidation peak current of tyrosine varies linearly with its concentration in the range of 0.04-1.0 mu M, 1.0-60 mu M and 60-600 mu M, and the detection limit is 0.02 mu M. The MWCNT-COOH/ABPE was applied to the determination of tyrosine in food with satisfactory results.
