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When T-300 was electrochemically etched at a constant current density (1.2 and 2.6 A cm-2), the voltage of the reaction was about 3 V at the beginning and gradually increased as the etching proceeded as shown in Fig. 7a. This is because the iR drop of the solution in microholes increases when the solution in the microholes are partially filled with gas evolved at the carbon fiber surface. The measured average slope in Fig. 7b and calculated conductivity (70 mS/cm) indicated that about hatf of the volume in the microholes is filled with gas during the etching process. The carbon fiber tips probably wet from the epoxy wall through the boundary between carbon fibers and epoxy resin. It is conceivable that the bubble size of the gas evolved at low current densities, is small, and tends to cover the whole surface of the carbon fiber tips. This might be the reason why a sharper tip is obtainable at low current densities.

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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

No abstract