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http://dx.doi.org/10.7464/ksct.2014.20.2.130

Surface Properties of Mercaptopyruvic-acid Layer Formed on Gold Surfaces Interacting with ZrO2  

Park, Jin-Won (Department of Chemical and Biomolecular Engineering, College of Energy and Biotechnology, Seoul National University of Science and Technology)
Publication Information
Clean Technology / v.20, no.2, 2014 , pp. 130-135 More about this Journal
Abstract
It is investigated that the surface properties of mercaptopyruvic-acid layer formed on gold surfaces may make an effect on the distribution of either gold particle adsorbed to the zirconia surface or vice versa. For the investigation, the atomic force microscope was used to measure the surface forces between the surfaces as a function of the salt concentration and pH value. The forces were quantitatively analyzed with the derjaguin-landau-verwey-overbeek (DLVO) theory to estimate the electrostatic properties, potential and charge density, of the surfaces for each condition of salt concentration and pH value. The estimatedvalue dependence on the salt concentration was explained with the law of mass action, and the pH dependence was interpreted with the ionizable groups on the surface. The salt concentration dependence of the surface properties, found from the measurement at pH 4 and 8, was predictable from the law. It was found that the mercaptopyruvic-acid layer had higher values for the surface charge densities and potentials than the zirconia surfaces at pH 4 and 8, which may be attributed to the ionizedfunctional-groups of the mercaptopyruvic-acid layer.
Keywords
Mercaptopyruvic-acid; Gold surface; $ZrO_2$ surface; Atomic force microscope (AFM); DLVO theory;
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Times Cited By KSCI : 3  (Citation Analysis)
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