GEOC 85 |
| Nobuo Maeda, Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106, Mika Kohonen, Abteilung Angewandte Physik, Universitat Ulm, Ulm, D-89069, Germany, Kenny Rosenberg, Physics Department, University of California, Santa Barbara, CA 93106, and Richard Pashley, Department of Chemistry, Australia National University, GPO Box 4, Canberra, 2601, Australia. |
| Capillary condensation and evaporation have been of great interest in both fundamental and applied sciences for many years. The simplest way to study such systems, without complication arising from polydispersity and interconnectivity of pores in porous media, is the use of an isolated model pore of adjustable dimension as in a Surface Forces Apparatus (SFA). Our recent work suggested development of unusually large density gradients during the course of evaporation or condensation of several hydrocarbon liquids in such a model pore. Presence of such density gradients would not only be of fundamental importance in the field of capillarity but also have significant implications to our understanding of the hydrophobic interaction, because non-uniform distribution of dissolved air molecules between hydrophobic moieties would generate attractive potential of mean force. We present results on capillary condensation and evaporation, and demonstrate how dissolved gas contributes to the hydrophobic attraction between oil droplets in aqueous solutions. |
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Interfacial Phenomena: Linking Atomistic and Macroscopic Properties
1:00 PM-5:50 PM, Tuesday, March 30, 2004 Marriott -- Marquis NW, Oral
Division of Geochemistry |