مشخصات پژوهش

Suspensions ofHAnanoparticles were prepared in different alcohols using triethanolamine (TEA) as dispersant. Optimum concentration of TEA increased with molecular weight of alcohol: 0.67, 0.67 and 8ml L−1, respectively, in methanolic, ethanolic and butanolic suspensions. Current density increased during EPD from TEA containing methanolic and ethanolic suspensions due to desorption ofH+TEA ions from depositedHAnanoparticles under the influence of applied electric field. Particles were detached from deposits into the suspensions at the interface after switching off the voltage due to the generation of an electrochemical potential difference there. The rate of detachment decreased continuously in all methanolic suspensions and ethanolic suspensions with 4ml L−1TEA due to the continuous reduction in the electrochemical potential difference at the interface caused by the effective diffusion of high concentration of free TEA andH+TEA species present in the liquid phase of deposits into the suspension. However, the rate of detachment remained constant in ethanolic suspensions with TEA<4ml L−1 and in all butanolic suspensions. The mass flow of TEA and H+TEA species from deposit into the suspensions is negligible in these suspensions so that the electrochemical potential difference and so detachment rate remain constant.