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<p>The relative influence of the capillary, Marangoni, and hydrophobic forces in mediating the evaporation of water from carbon foam based porous media, in response
to incident solar radiation, are investigated. It is indicated that inducing hydrophilic
interactions on the surface, through nitric acid treatment of the foams, has a similar
effect to reduced pore diameter and the ensuing capillary forces. The efficiency of
water evaporation may be parameterized through the Capillary number (Ca), with
a lower Ca being preferred. The proposed study is of much relevance to efficient
solar energy utilization. </p>
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