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光致活性氧淬灭方法检测生物抗氧化剂动力学模型分析

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分析化学 2016年第8期44卷 1257-1262页

作者：贾瑞杰张强刘继锋 Mohamad hojeij hubert h.girault 聊城大学化学系食品营养与安全教育部重点实验室天津科技大学 Laboratoire d'Electrochimie Physique et Analytique Station 6Ecole Polytechnique Fédérale de Lausanne

以Ti O;纳米颗粒光催化反应为模型,研究了反应过程中的活性氧（ROS）产生以及活性氧淬灭的反应动力学模型。对苯二甲酸分子与体系中的光催化反应产生的Oh·反应,生成具有荧光性质的2-羟基对苯二甲酸(λ;=315 nm,λ;=425 nm),因此对苯二... 详细信息

以Ti O;纳米颗粒光催化反应为模型,研究了反应过程中的活性氧（ROS）产生以及活性氧淬灭的反应动力学模型。对苯二甲酸分子与体系中的光催化反应产生的Oh·反应,生成具有荧光性质的2-羟基对苯二甲酸(λ;=315 nm,λ;=425 nm),因此对苯二甲酸作为氧化探针分子与体系中的生物抗氧化剂（AOs）分子竞争与ROS的反应,根据体系的荧光、反应时间以及AOs的浓度建立了AOs淬灭ROS的反应动力学模型。根据此模型推导AOs清除ROS的动力学常数,发现常见的生物抗氧化剂的抗氧化活性大小顺序为:硫辛酸、没食子酸、谷胱甘肽、尿酸、维生素C、维生素E、水溶性维生素E和胆红素。

关键词：活性氧生物抗氧化剂光催化动力学

PROTEIN IMAGING BY SCANNING ELECTROChEMICAL MICROSCOPY

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PROTEIN IMAGING BY SCANNING ELECTROCHEMICAL MICROSCOPY

ELECTROANALYTICAL APPROACh TO PROTEOMICS

第十二届北京分析测试学术报告会暨展览会(BCEIA 2007)

作者： Meiqin ZhANG Fernando CORTES SALAZAR Yuanhua ShAO Gunther WITTSTOCK hubert h girault Laboratoire d'Electrochimie Physique et Analytique Station 6 Ecole Polytechnique Fédérale de Lausanne Institute of Analytical Chemistry College of Chemistry and Molecular Engineering Peking University Department of Pure and Applied Chemistry and Institute of Chemistry and Biology of the Marine Environment Faculty of Mathematics and Natural Sciences Carl von Ossietzky University of Oldenburg

Scanning electrochemical microscopy(SECM),a scanning probe technique,has been successfully developed into a powerful tool for studying heterogeneous and homogeneous reactions,for high-resolution imaging of the chemica...

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ELECTROANALYTICAL APPROACH TO PROTEOMICS

第十一届北京分析测试学术报告会暨展览会(BCEIA 2005)

作者： JeanPierre ABID Loc DAYON JeanOlivier GAMBY Jacques JOSSERAND hoang Tram LAM Niels LION Andrea LIONELLO Christophe ROUSSEL hubert h.girault Laboratoire d’ Electrochimie Physique et Analytique Ecole Polytechnique Federale de Lausanne

Proteomics involves the analysis of the protein contents of a biological *** large number of proteins involved and the very large concentration range represents a major analytical *** this lecture,we shall emphasize t...

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芯片电泳推拉式压力进样方法

高等学校化学学报 2004年第Z1期25卷 155-156页

作者：吴志勇白晓霞 GAMBY Jeanolivier girault h. hubert 洛桑联邦高等理工学院化学与分子生物学所物理及分析电化学实验室 CH-1015洛桑瑞士洛桑联邦高等理工学院化学与分子生物学所物理及分析电化学实验室CH-1015洛桑瑞士洛桑联邦高等理工学院化学与分子生物学所物理及分析电化学实验室CH-1015洛桑瑞士洛桑联邦高等理工学院化学与分子生物学所物理及分析电化学实验室CH-1015洛桑瑞士

　　芯片电泳作为微流控分析系统的典型代表,广泛涉及材料、微加工方法、微液流控制、分离模式和检测方法等诸多方面.与传统分析系统一样,样品制备和引入也是微全分析系统实现样品到结果首先面临的问题.电进样一直是芯片电泳系统的主流... 详细信息

　　芯片电泳作为微流控分析系统的典型代表,广泛涉及材料、微加工方法、微液流控制、分离模式和检测方法等诸多方面.与传统分析系统一样,样品制备和引入也是微全分析系统实现样品到结果首先面临的问题.电进样一直是芯片电泳系统的主流进样方法.而传统毛细管电泳系统中与电进样同样经常使用的压力进样方法则很少用于芯片电泳系统.……

关键词：芯片电泳压力进样法推拉式

Characterization of Surface State of Inert Particles: Case of Si and SiC

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Journal of Minerals and Materials Characterization and Engineering 2016年第1期4卷 62-72页

作者： Désiré M. K. Abro Pierre Dablé Fernando Cortez-Salazar Véronique Amstutz hubert girault Laboratoire de Chimie Physique Université F. H. B. Cocody Abidjan C&ocirc te d’Ivoire Laboratoire de Thermodynamique de Traitement et Sciences des Surfaces et Interfaces Institut National Polytechnique F.H.B. Yamoussoukro C&ocirc te d’Ivoire Laboratoire d’Electrochimie Physique et Analytique Ecole Polytechnique Fédérale de Lausanne Sion Suisse

Silicon and Silicon carbide particles have been investigated by the mean of infrared (IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) to establish their surface states. The results of this research are based on the estimation of the area under the high resolution peaks by isosceles triangles. This approach leads to the repartition of the particles surfaces in term of atomic percentage and of type of bonds. The surface of silicon particles is divided up into 54.85% of Si-O bonds and 36.85% of Si-Si bonds. The remaining surface is constituted of zeolite, the raw material used to produce the silicon particles. The surface of silicon carbide particles consists of 50.44% of Si-C bonds, 24.01% of Si-O bonds and 25.55% of graphite. 10.01% of the graphite is derived from the oxidation of Si-C bonds while 11.48% is due to contamination. The zeta potential evolution versus ph confirms the distribution of chemical groups found.

关键词： IR and XPS Sprectra Si SiC Surface State Zeta Potential

Design and Characterization of a horizontal Double Impinging Jet Cell: Determination of Flow Modes at the Surface of a Flat Electrode

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Journal of Materials Science and Chemical Engineering 2016年第8期4卷 18-28页

作者： Désiré M. K. Abro Pierre Dable Fernando Cortez-Salazar Véronique Amstutz Edith Kouassi Kwa-Koffi hubert girault Laboratoire de Chimie Physique Université Félix Houphouet-Boigny Abidjan C?te d’Ivoire Laboratoire de Thermodynamique de Traitement et Sciences des Surfaces et Interfaces Institut National Polytechnique Félix Houphouet-Boigny Yamoussoukro C?te d’ivoire Laboratoire d’Electrochimie Physique et Analytique Ecole Polytechnique Fédérale de Lausanne Sion Suisse

An electrochemical cell consisting of a double horizontal Impinging Jet Cell (IJC) has been conceived and characterized. The purpose of this system is the simultaneous electrodeposition of a composite metal/particle coating on both surfaces of a metal sheet. The silica particles imprint in the nickel matrix has allowed to distinguish four different flow areas onto the electrode namely the stagnation area, the radial flow area characterized by a higher flow speed, the return flow area that involves gravity effect, and the drainage area with a constant draining speed. Based on the limiting current evolution as a function of the Reynolds number, three flow modes were extracted: the Laminar Low Flow (LLF), the Laminar high Flow (LhF) and the Disturbance. The IJC investigated ensures a laminar flow for a large range of flow rate from a nozzle-to-sample distance of 19 mm and creates an laminar flow ovoid plan merged with the sample for the high flows.

关键词： Impinging Jet Cell hydrodynamic Flow Regimes Electrocodeposition

Oxygen Plasma/Bismuth Modified Inkjet Printed Graphene Electrode for the Sensitive Simultaneous Detection of Lead and Cadmium

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American Journal of Analytical Chemistry 2020年第1期11卷 1-14页

作者： Léopoldine Sonfack Guenang Prachi Gupta Victor Costa Basseto Milica Jovic Ervice Ymélé Andreas Lesch hubert girault Ignas Kenfack Tonlé Electrochemistry and Chemistry of Materials Department of Chemistry University of Dschang Dschang Cameroon Inorganic Chemistry Laboratory Department of Chemistry University of Buea Buea Cameroon Laboratoired’ Electrochimie Physique et Analytique (LEPA) Ecole Polytechnique Fédérale de Lausanne Lausanne Switzerland

In this work, a simple procedure for the preparation of an inkjet printed disposable graphene electrode is reported. Commercial graphene ink was printed on a kapton substrate and the resulting electrode was 30 min treated by oxygen plasma, then modified by a bismuth salt. The as prepared electrode was characterized by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), laser scanning microscopy (LSM) and scanning electron microscopy (SEM) coupled to energy-dispersive X-ray spectroscopy (EDX). The sensing properties of the characterized electrodes were then investigated using cyclic voltammetry and Electrochemical Impedance Spectroscopy (EIS). Afterwards, these electrodes were exploited in a comparative way for the electroanalysis of Cadmium(II) and Lead(II) ions. An increase in the electrode sensitivity due to its modification and to the presence of bismuth was observed. Some preliminary experiments based on stripping square wave voltammetry highlighted the interest of using the proposed disposable inkjet printed electrodes for the electrochemical detection of heavy metals in tap water.

关键词： Inkjet Printing Technology Disposable Printed Graphene Electrode heavy Metals Stripping Voltammetry

Forced Electrocodeposition of Silica Particles into Nickel Matrix by horizontal Impinging Jet Cell

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Journal of Materials Science and Chemical Engineering 2017年第2期5卷 51-63页

作者： Désiré M. K. Abro Pierre Jean Marie Richard Dable Véronique Amstutz Edith Kouassi Kwa-Koffi hubert girault Faculté des Sciences des Structures de la Matiè re et de Technologie Universit&eacute Fé lix hOUPhOUET-BOIGNY Abidjan C&ocirc te d'Ivoire Dé partement de Gé nie Mé canique et Energé tique Institut National Polytechnique F&eacute lix hOUPhOUET-BOIGNY Yamoussoukro C&ocirc te d'ivoire Institut des sciences et ingé nierie chimiques Ecole Polytechnique F&eacute dé rale de Lausanne Sion Suisse

The improvement of silica particle codeposition into a nickel electrodeposited composite coating (ECC) by a double face horizontal impinging jet cell (IJC) has been studied. The microstructure of coatings was examined by means of scanning electron microscopy performed in backscattered electron mode. The embedded particles distribution was shown to be the densest and the most uniform in laminar low flow mode and when the nozzle is at a distance of 5 mm close from the cathode. Excrescences observed on the composite surface are due to the wave-like flow of the jet on the cathode surface. The silica content of the nickel composite coatings was assessed by energy dispersive X-ray spectroscopy. The amount of particles embedded in the coating decreases with an increasing Reynolds number and as the nozzle-to-sample distance d becomes larger. A maximum rate of 4.43 wt% of silica has been successfully loaded at a distance d equal to 5 mm in the Ni-SiO2 composite coating.

关键词： Electrocodeposition Nickel-Silica Composite Coatings Impinging Jet Cell hydrodynamics

Stratigraphic Sequences and Their Implication in a Sea Area of the Western Yellow Sea Near Qingdao Coast During the Late Quaternary

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Journal of Ocean University of China 2004年第1期3卷 85-92页

作者： WANGKuiyang LIANGRuicai R.girault FirstInstituteofOceanography SOAQingdao266061P.R.China IXSEAS.A.S. 78160Marly-le-RoiFrance

An analysis of seismic data obtained through a cable route survey starting from the Qingdao coast to offshore has determined nine seismic units since Late Pleistocene. Correlation of the seismic data with Borehole hj2 confirms three eustatic events that occurred during the Late Quaternary and formed terrestrial units 2, 5 and 7. At the low sea level stage, paleo rivers highly developed, eroded previous strata, formed paleo valley, and left materials.

关键词： stratigraphic sequences Late Quaternary Qingdao coast Yellow Sea