Interfacial Acidities, Charge Densities, Potentials, and Energies of Carboxylic Acid-Functionalized Silica/Water Interfaces Determined by Second Harmonic Generation
2004; American Chemical Society; Volume: 126; Issue: 38 Linguagem: Inglês
10.1021/ja0474300
ISSN1943-2984
AutoresChristopher T. Konek, Michael J. Musorrafiti, Hind A. Al‐Abadleh, Paul A. Bertin, SonBinh T. Nguyen, Franz M. Geiger,
Tópico(s)Chemical and Physical Properties in Aqueous Solutions
ResumoSecond-harmonic studies were carried out to determine the interfacial acidity, the potential, and the interfacial energy density of an acid-functionalized silica/water interface between pH 2 and 12. The interfacial potential changes over 3 orders of magnitude, from 10-2 mV to several tens of millivolts, and the interfacial energy density changes by 7 orders of magnitude, from less than 10-7 mJ/m2 to several millijoules per square meter. The methodology presented in this study provides quantitative thermodynamic information necessary for understanding and predicting how solvated species interact with functionalized organic adlayers at liquid/solid interfaces over a wide pH range.
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