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A number of ion separation methods successfully separate ions by controlling the ion's transport. In general, transport rate of ions depends on their charge, size or hydrated radii. However, methylene blue (MB) used in this study showed different transport tendency compared to other ions. The results indicate that the transport of MB is affected by its adsorption property. Thus, we tried to elucidate the special transport mechanism of MB in detail. The conducting polymer modified membrane used in this study was prepared by the electrochemical polymerization of pyrrole on a gold-sputtered polycarbonate (PC) membrane in aqueous solution. Characterization of the polypyrrole (PPy) modified membrane was performed by scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX). The transport of MB through the PPy membrane was controlled by applied potentials. The concentration change of MB in permeated cell was detected by high performance liquid chromatography (HPLC) equipped with a UV-Vis detector. [ABSTRACT FROM AUTHOR]

Abstract: An alkylthiol functionalized monomer based on 3,4-ethylenedioxythiophene methanol (EDTM), namely 3-((2,3-dihydrothieno[3,4-b][1,4]dioxin-2-yl)methoxy)propane-1-thiol (EDTMSHA), was synthesized and confirmed by 1H NMR, 13C NMR, and gas chromatography mass spectroscopy (GC/MS). The new monomer successfully produced a self-assembled monolayer (SAM), which was deposited on a gold disc electrode and then electrochemically polymerized. The SAM formation of the new conducting polymer films exhibited relatively low oxidation potentials with a well defined reversible and stable electrochemical behavior compared to conventional electropolymerized film. [Copyright &y& Elsevier]

Abstract: Hybrid wires composed of metal and conducting polymer (polypyrrole, Ppy) were electrochemically synthesized using a template synthesis method. We showed that the dimensions of the hybrid wires can be tailored by controlling the time of electrolysis. The electrical properties of Ppy having different lengths were measured using a scanning probe microscope (SPM) tip as an electrode without aligning the hybrid wires on a substrate. Especially, temperature-dependent characteristics of the curve were determined. As we expected, the shorter the Ppy wire is, the better the current response produced. The activation energy of each Ppy wire is determined. It is confirmed that the electrical properties of a single wire of Ppy can be measured by SPM. [Copyright &y& Elsevier]