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The wettability and stability of silane-treated substrates are central in many processes of industrial and environmental interest. Here, we bring the capability of X-ray photoelectron spectroscopy (XPS) to bear on the wettability evaluation of treated glass. For a suite of silane-treated slides we investigate the relationship between wettability and surface composition as determined from XPS. The...
Recent displacement experiments show anomalously rapid spreading of water during imbibition into a prewet porous medium. We explain this phenomenon, called hyperdispersion, as viscous flow along fractal pore walls in thin films of thickness h governed by disjoining forces and capillarity. At high capillary pressure P c , the total wetting phase saturation S w is the sum of wetting...
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