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O. V. SMIRNOVA
«Study of Absorption and Desorption of Phenoxycarbon Acids on Silica Surface»
291–302 (2008)

PACS numbers: 68.35.Md, 68.43.-h, 82.30.Rs, 82.56.Dj, 82.65.+r, 82.70.Uv, 82.80.Ms

Adsorption of a number of phenoxycarbon acids with various functional groups on silica surface is investigated. The contribution of hydrophobic interaction and formation of H bonds with carboxyl and hydroxyl protons into adsorption process is determined. Using temperature-programmed desorption mass spectrometry, an influence of molecules’ structure and adsorption on highly dispersed silica on thermal stability of phenoxycarbon acids is ascertained. The method of high-resolution nuclear magnetic resonance under conditions of liquid-phase chilling is used to determine dependence of surface energy gamma-s on pKа of the present molecules of phenoxycarbon acids. Two types of interaction of phenoxycarbon acids with silicon dioxide surface are investigated, namely, specific interaction with surface silanol groups and nonspecific interaction with hydrocarbon component of hydrophobizated silica surface.