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Showing 1 to 20 of 34 for “"Modified Electrodes"”.
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Characterization of polymer-modified electrodes from transient ultramicroelectrode experiments
… to obtain in situ film thickness of a thin film modified electrode, consisting of a spin coated QPVP on a gold or glassy carbon electrode, occupies a significant portion of this work. A novel application of the technique to the determination of diffusion coefficients of mobile electroactive …
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Kinetics and mechanism of an adsorptive displacement on polyoxotungstate modified electrodes
An electrochemical approach has been used to switch adsorbate monolayers on a mercury surface between two competing adsorbates. The principle is that the adsorption strength of silicotungstic acid (SiW$\sb{12}$) is stronger than that of the oxidized form of 2,6-disulfonated anthraquinone (2,6-AQDS) …
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Direct Force Measurements on the Colloidal Scale: From Modified Electrodes to Particle Manipulation
… to tune interfacial properties of an electrode modified with an organic layer. In particular the adhesion and ion adsorption have been studied, which are ubiquitous phenomena in the colloid science, electrochemistry, and biology. Moreover, a novel technique has been developed to fabricate …
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Modified Electrodes for Amperometric Determination of Glucose and Glutamate Using Mediated Electron Transport
… experiments. As a solution to the ISAM modified electrodes degrading in the flowing system, a covalently modified surface was developed. Using cyclic voltammetry, these covalently modified surfaces were shown to be able to oxidize glucose in solution. The LOD of the covalently modified 2 …
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Properties of redox polymer modified electrodes and an investigation of the claims of cold fusion
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1990.
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Development of Electrochemical Biosensors for Potential Liver Disease Detections of ALT & AST and Application of Ionic Liquid into Biosensing-Modified Electrodes
… immobilizing pyruvate oxidase (PyOx) into a modified matrix of chitosan (Chi)–ionic liquid (IL). A sensitive and selective detection on serum-ALT was performed. Incorporating BMIM-BF4 into the Chi-matrix yielded a benign environment and retained most activity of immobilized PyOx based on …
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Electrochemical energy conversion using metal hydrides hydrogen storage materials
… metal hydride materials employed as negative electrodes in Ni-MH batteries are investigated. Attention is on AB5 alloys due to their intermediate thermodynamic properties. However, AB5 alloys a have tendency of forming oxide film on their surface which inhibits hydrogendissociation and …
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Transient and steady state electrochemical studies of transport dynamics and equilibria in thin polymer films containing redox centers
… poly(4-vinylpyridine) (QPVP) modified electrodes in contact with potassium nitrate (KNO$\sb3$) solution. The goal was to intercompare the electron diffusion coefficient (D$\sb{\rm E}$) of the system obtained by transient and steady state electrochemical methods and to evaluate …
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Interlamellar modification of smectite clays
… were studied in free solution and as clay modified electrodes to investigate the origin of electroactivity in clay modified electrodes. The electroactivity of clay modified electrodes prepared using our method can be attributed to ion pairs sorbed to the surface of the electrode, in excess …
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Double Pulse Coulometry for Interfacial Biosensing at Platinum Microelectrodes
… scheme for cholesterol sensing at platinum microelectrodes was developed and optimized to avoid amperometric measurements needed to reference to a nonzero solution baseline current and baseline shift upon repositioning the electrode in approaching and contacting with the cell plasma membrane. In …
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Green Carbon Quantum Dots Based Electrochemical Sensors for Analysis of Neurotransmitters
… impedance spectroscopy (EIS). Bare GCE and GCE modified with these materials (GCE/CQDs, GCE/bCQDs, GCE/CNPs, GCE/bCQDs/CNPs, and GCE/CQDs/CNPs) in the presence of 5 mM ferricyanide/ferrocyanide ([Fe(CN)6]3-/4-) redox probe were used for electrochemical characterization. The EIS data showed that …
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Glycerol Oxidation with Zeolite and Hierarchical Zeolite as Catalysts and Electrocatalysts
… in sodic (Na+) and Protonic (H+) forms, were modified with the introduction of ions of transition metals (Cu, Fe, Ni, Zn) via ion-exchange method. The obtained materials were characterized (XRD, N2 physisorption, ICP-OES, NH2 adsorption microcalorimetry) and tested in different conditions to …
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Electrochemical Studies of The Interaction Between DNA and a Compound Having Anticancer Properties.
… having anticancer properties. A DNA modified nanometer-sized gold electrode was prepared by surface modification of a bare gold electrode using cysteamine. These electrodes have been characterized using electrochemical techniques and were used to study the interaction between DNA and …
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Investigation of yeast cell responses to pulsed electric field treatment /
… 100 seconds. For the very first-time yeast-modified electrodes were successfully used to investigate electroporation of the same cells. Exposure to PEF resulted in lower redox activity, which could be compensated entirely by adjusting the extracellular concentration of NADH to 1 mM. Our …
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Carbon Paste Macrocycle Doped Composite Electrodes for the Selective Electrochemical Detection of Dopamine
… In this thesis, a number of carbon paste electrodes modified with macrocycles for the electrochemical detection of DA is reported. The different macrocycles employed were based on cyclodextrin derivatives and consist of sulfated β-CD (S-β-CD), carboxymethyl β-CD (CM-β-CD), Ferrocene …
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Electrochemical wiring of cyanobacteria to anodes using polymers towards biohybrid devices for solar-chemical production
… are key for efficient wiring of cyanobacteria to electrodes are poorly understood. Bridging this knowledge gap will be essential for guiding rational design of next-generation polymers specifically tailored to achieve maximal output. In this work, we systematically tested two common polymers — the …
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Otimização de um eletrodo de carbono vítreo modificado com nanotubos de carbono para detecção voltamétrica do fungicida carbendazim.
… so promising, at the construction of chemically modified electrodes, that coupled electroanalytical techniques improve the determination of pesticides residues in food and environmental samples, presenting high sensitivity and selectivity. Accordingly, this work proposes the construction and …
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Investigation of a novel electrocatalyst for hydrogen peroxide reduction and its application to sensing and biosensing.
… was based on a modification of silver paste electrodes, and the fabrication of an enzyme biosensor platform capable of operating on this material. A further key theme that was explored in this work was to make the biosensor amenable to fabrication using printing techniques, including screen …
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