Model and Experimental Study of Surfactant Solutions and Pure Liquids Contact Angles on Complex Surfaces - Drops and Bubbles in Contact with Solid Surfaces - page 204

(a)
(b)
Figure 11. Advancing contact angle on (a) Teflon AF coated and (b) uncoated AKD versus advancing
contact angle on (a) Teflon AF coated and (b) OTS coated silicon for pure liquids and surfactant
solutions of similar intrinsic contact angle. Surfactant solutions show generally higher contact angles
than the pure liquids. For the modified Cassie prediction, f is (a) 0.12 and (b) 0.08, the dashed line
shows super CMC concentrations of SDS. In (b) (and for two data points in (a)), the coated silicon
contact angles are linear interpolations or extrapolations from the closest measured data to match
measured values of concentration/surface tension of surfactant solutions on AKD to coated silicon.
Error bars show one standard deviation. Standard deviations are unavailable for uncoated AKD (data
taken from reference [77]).
solutions of SDS contact angle on smooth Teflon AF surfaces was fit to estimate
values for the adsorption coefficients in the model.