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Adhesive pad diameters on surfaces formed from a mixed OH/CH3 alkane thiol SAM series, a self-assembled CF3 monolayer and a PDMS polymer brush, plotted against the cosine of the advancing water contact angle of the surface in air as a measure of wettability. (Note: it is the internal contact angle that the water droplet forms with the surface in air that is measured, i.e. hydrophobic surfaces have a large θW and therefore cos θW is small.)
