Polyphenol compounds, such as caffeic acid, are important substrates of oxidation in beverages such as wine, and more rapid and sensitive methods of analysis are being sought. The conducting polymer poly-3,4-ethylenedioxythiophene (PEDOT) provides good separation of caffeic acid from antioxidant additives in wines, and produces a clear anodic peak that can be used to quantify caffeic acid and r...

Linear polarization is a potentiodynamic method used for electrochemical characterization of materials. Obtained values of corrosion potential and corrosion current density offer information about material behavior in corrosion environments from the thermodynamic and kinetic points of view, respectively. The present study offers a comparison of applications of the linear polarization method (fr...

The electrochemical behavior of thioctic acid at the hanging mercury drop electrode was studied in different supporting electrolytes. In Britton - Robinson buffer pH 3.29, the square - wave adsorptive anodic stripping voltammogram of thioctic acid exhibited a single well - defined anodic peak at about -0.21 V vs Ag/AgCl. The peak response was characterized with respect to pH, preconcentration t...

The redox processes of quercetin in acidic medium (pH 1.8) were investigated on a graphite-wax electrode by cyclic voltammetry, potential-controlled UV/Vis spectra and derivative cyclic voltabsorptometry. A long-optical-path thin-layer cell was used for the spectroelectrochemical measurements. A stable quinonic product with a united conjugated structure was found to form at the first anodic pea...

Anodic porous alumina has been widely investigated and used as a nanostructure template in various nanoapplications. The porous structure consists of numerous hexagonal cells perpendicular to the aluminum substrate and each cell has several tens or hundreds of nanoscale pores at its center. Because the nanomorphology of anodic porous alumina is limited by the electrolyte during anodizing, the d...

The influence of nanoparticle aggregation on anodic stripping voltammetry is reported. Dopamine-capped silver nanoparticles were chosen as a model system, and melamine was used to induce aggregation in the nanoparticles. Through the anodic stripping of the silver nanoparticles that were aggregated to different extents, it was found that the peak area of the oxidative signal corresponding to the...

We report the successful application of a simple recursive proportional-feedback (RPF) algorithm to control chemical chaos observed during the electrodissolution of a rotating copper disk in a sodium acetate/acetic acid buffer. The RPF method is generally applicable to the control of chaotic systems that are highly dissipative and adequately described by one-dimensional maps of a single variabl...

Single walled carbon nanotubes ~SWNT! produced by the anodic arc discharge over a range of constant background pressures of helium ~100–1000 Torr! were examined under a high-resolution transmission electron microscope, and a Raman spectrometer. It was found that the average SWNT diameter is about 2 nm and fairly independent of the background pressure. Analysis of the relative purity of SWNTs sa...

This study experimentally examined the performance consistency of sediment microbial fuel cells (SMFCs) with the same geometry and the same startup protocol. The cells revealed very different characteristics after startup. Doubling the anodic surface area did not enhance the cell performance. Stirring the sediment and aerating the upper water increased voltage output, and the chemical environme...

We describe a novel medium, a captopril/thiophenol (Capt/TP) mixed self-assembled monolayer (SAM) formed on gold, for selectively pre-concentrating serotonin (5-hydroxytryptamine, 5-HT). The 5-HT molecules were shown to be selectively captured via formation of a strong complex, providing anodic stripping currents upon anodic scan or drastic increases in charge-transfer resistances for a redox p...