experiments. The “blank” sample was produced by method 1 with the silane omitted. It should be noted that the BET “C constant” has previously been reported to exhibit a strong correlation with surface energy.61 The desirable characteristics for hydrophobic materials are a high grafting density (as represented by a high weight percent of F and C, as well as weight loss at 2001000 C), a low content of hydrophilic groups (as represented by water uptake, weight loss below 200 C, which is expected to mainly consist of water and dimethylamine), and a low surface energy (a low BET “C constant”). Maintenance of a reasonably high specific surface area is also considered desirable for liquid-repellant surfaces, as it indicates preservation of the multiscale surface roughness that is desirable for producing a composite solidliquidair interface.