Xem 1-20 trên 52 kết quả Voltammetry
  • Voltammetry techniques measure current as a function of applied potential under conditions that promote polarization of a working electrode. Polarography: Invented by J. Heyrovsky (Nobel Prize 1959). Differs from voltammetry in that it employs a dropping mercury electrode (DME) to continuously renew the electrode surface. Amperometry: current proportional to analyte concentration is monitored at a fixed potential

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  • The cathodic reduction of nitrate and nitrite ions on a copper electrode in aqueous potassium chloride solutions was studied using cyclic voltammetry technique. The cyclic voltammograms showed that nitrate and nitrite ion reduction occurred in the 0.14 M KCl solution with peak potentials of -1.25 to -1.30 V and -1.20 to -1.25 V (Ag/AgCl) respectively.

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  • A new procedure is presented for the determination of low concentrations of lead and cadmium in water samples. Ligand assisted pseudo-stir bar hollow fiber solid/liquid phase microextraction using sol–gel sorbent reinforced with carbon nanotubes was combined with differential pulse anodic stripping voltammetry for simultaneous determination of cadmium and lead in tap water, and Darongar river water samples.

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  • (bq) part 1 book "electrochemical methods - fundamentals and applications" has contents: introduction and overview of electrode processes, potentials and thermodynamics of cells, kinetics of electrode reactions, mass transfer by migration and diffusion, basic potential step methods, potential sweep methods, polarography and pulse voltammetry,...and other contents.

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  • Cơ chế của quá trình oxi hóa điện hóa pirol thành polypirol chưa được nghiên cứu đầy đủ. Để góp phần làm sáng tỏ vấn đề này, bài báo tập trung nghiên cứu động học phản ứng oxi hóa pirol tạo màng polypirol bằng phương pháp cyclic voltammetry.

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  • To help you further Chemistry references. Invite you to consult the document content "Chapter 7: Electroanalytical Techniques". The contents of the presentation materials: Fundamentals of electrolysis, electrogravimetric analysis, voltammetry. Hope this is useful references for you.

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  • The ultimate goal of this paper is to develop derivatives of ferroceneservingas an electrochemical probe that would enhance the performance of immunosensor.An immunosensor based on polypyrrole-streptavidin layer as platform for immobilization of biotinylatedferrocene and antibodies was developed. The measurement of redox signal of ferrocene was analyzed by differential pulse voltammetry (DPV) method and underlined a variation of redox properties upon the antigen interaction.

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  • The cathodic reduction of nitrate and nitrite ions on a copper electrode in aqueous potassium chloride solutions was studied using cyclic voltammetry technique. The cyclic voltammograms showed that nitrate and nitrite ion reduction occurred in the 0.14 M KCl solution with peak potentials of -1.25 to -1.30 V and -1.20 to -1.25 V (Ag/AgCl) respectively.

    pdf7p chikychiky 11-11-2018 21 0   Download

  • The electrochemical behavior of paracetamol (PA) and dopamine (DA) has been investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and square wave voltammetry (SWV) using a selective and sensitive iron oxide (Fe2O3) nanoparticle modified carbon paste electrode (IOCPE).

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  • In these conditions, the sharp peak of DNP appeared at -0.348 V. The peak current of DNP was proportional to the concentration of DNP in the range of 0.03 - 0.75 mg/L. The limit of detection of DNP in water sample was 0.00917 mg/L and its limit of quantity was 0.03057 mg/L.

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  • Đồ án tốt nghiệp: Nghiên cứu hành vi điện hoá của vật liệu điện cực và dung môi trong nguồn điện Lithium trình bày về các phương pháp để nghiên cứu hành vi điện hoá của vật liệu điện cực và dung môi trong nguồn điện Lithium bao gồm phương pháp quét thế vòng CV(Cyclic voltammetry), phương pháp đo phổ tổng trở, phương pháp đo đường cong phóng điện.



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  • Bài viết trình bày kết quả tổng hợp polyaniline (PANi) lên điện cực giấy bucky bằng phương pháp điện hóa, với quy trình tổng hợp đơn giản, thực hiện thí nghiệm tại nhiệt độ phòng. Các kết quả về đường cong cyclic-voltamtry đã chứng tỏ phản ứng điện hóa diễn ra trên bề mặt điện cực Pt oxy hóa hai giai đoạn.

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  • One of the subjects of Ni-MH batteries studies is justly the electrochemically active material for the positive electrode-hydroxide nickel. This hydroxide Ni(OH)2 has been prepared in laboratory by chemical sedimentation from NiCl2 and NaOH solutions. The obtained product has been examined using different techniques, such as X ray Diffraction (XRD), Scanning Electronic Microscope (SEM) and electrochemical polarisation (cyclic voltammetry CV). The obtained results of obtained Ni(OH)2 show -type crystal, with grains of about 15 µm.

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  • The electrophoretic deposition (EPD) method was adopted for a fabrication of nanocomposite layers composed of ZnO particles covered by the polythiopene shell in a reduced state. This composite was prepared by oxidative polymerization of thiophene monomer with iron (III) chloride as a catalyst in the presence of ZnO particles. After polymerization, polythiophene in oxidized form was reduced by the extraction in methanol. Electrochemical properties of the obtained composite were measured by cyclic voltammetry and electrochemical impedance spectroscopy.

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  • In this paper, nickel oxide thin films on the titanium substrate were prepared by the sol-gel dipcoating technique with the precursors NiSO4.7H2O and acetic acid. The obtained thin films have a good adhesion to the substrate. The electrochemical behaviors of the NiOxHy thin films were investigated in KOH 1 M solution by the voltammetry technique. The effect of addition of platinum, heating temperature and the dip coating number on the electrochemical behavior was also investigated. The thin films have high electrochemical properties at 270o C and at third dip coating.

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  • Chemical structure of -aminonaphthalene (ANa) allows to deal with its electrochemical polymerisation, analogously as for aniline. To determine the oxidation potentials of ANa, the polymerisation has been realised on Pt electrode using cyclic polarisation. It was found that in sulphuric acid 0.5 M the first oxidation starts at 620 mV/SCE with the peak potential at 760 mV, and the second oxidation at 890 mV/SCE with the peak potential at 1230 mV. The PANa film development decreases the current peaks meaning a reduction of polymerisation rate.

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  • Electrochemical systems—e.g., batteries, capacitors, and fuel cells—are an integral part of modern technology. Electrochemical techniques, especially potentiometry and voltammetry, are indispensable for state-of-the-art analysis, and also for fundamental studies of the properties of solution species and solid phases and materials. Last, but not least, electrochemical concepts for understanding charge transfer reactions entered the fields of biochemistry and biophysics.

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  • Polyaniline has been utilised as an additive of the LaNi5 based negative electrodes which are activated using cyclic voltammetry. With GPES programme, exchange current i0, polarisation resistance Rp were determined. Variation of these parameters, and also of the currents at E = - 0.8 V and E = -1.2 V and of the charges quantities of charging process Qn and of discharging process Qp, as a function of PANi weight percentage x (wt%), have been studied, in order to estimate the effect of the ratios x on the negative electrodes activation.

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  • For the first time, the detection of DNA sequences, related to HIV (found in AIDS patients), using Methylene Blue (MB) as the redox indicator was performed. The voltametric signals have been investigated on bared chitosan (CS) modified; probe immobilized (DNA single strand) and target-hybridized (DNA double strand) electrodes sequentially by means of Cyclic Voltammetry (CV) and Square Wave Voltammetry (SWV). The response of hybridization between the probe and perfectly complementary, double-base mismatch, single-base mismatch of analyzed targets were clearly identified.

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  • Trong báo cáo này, chúng tôi chế tạo điện cực hoạt động ứng dụng trong cảm biến sinh học galactose dựa trên nền thanh nano ZnO được cố định enzyme galactose oxidase. Kết quả CV (Cyclic Voltammetry) thu được cho thấy hệ điện cực này hoạt động tốt trong dung dịch galactose oxidase nồng độ thay đổi từ 40 mM đến 230 mM với thời gian cố định enzyme là 3 giờ 30 phút.

    pdf7p ironman1234 06-06-2018 48 2   Download




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