Surface heterogeneity hydrophobic

Bolis, V., Cavenago, A., and Fubin, B., Surface heterogeneity on hydrophilic and hydrophobic silicas Water and alcohols as probes for H-bonding and dispersion forces, Langmuir, 13, 895, 1997. 

The other surprising results are the low surface area values computed from the water adsorption measurements. These may look surprising, but our results are in agreement with those of Gun ko [2] and Davydov [4]. In our opinion, these results show the silica s surface heterogeneity from a hydrophilic-hydrophobic point of view. 

V. Medout-Marere, A. El Ghzaoui, C. Chamay, J.M. Douillard, G. Chauveteau, S. Partyka, Surface Heterogeneity of Passively Oxidized Silicon Carbide particles Hydrophobic-Hydrophilic partition. J. Colloid Interface Sci. 223(2), 205-214 (2000). doi 10.1006/jcis. 1999.6625 J.M. Douillard, Concerning the thermodynamic consistency of the "Surface Tension Components" equations. J. Colloid Interface Sci. 188(2), 511-515 (1997). doi 10.1006/jcis. 1997. 4768... 

WETTING FILMS ON LOCALLY HETEROGENEOUS SURFACES HYDROPHILIC SURFACE WITH HYDROPHOBIC INCLUSIONS... 

Sorption of nonionic, nonpolar hydrophobic compounds occurs by weak attractive interactions such as van der Waals forces. Net attraction is the result of dispersion forces the strength of these weak forces is about 4 to 8 kj/mol ( 1 2 kcal/mol). Electrostatic interactions can also be important, especially when a molecule is polar in nature. Attraction potential can develop between polar molecules and the heterogeneous sod surface that has ionic and polar sites, resulting in stronger sorption. 

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