Silicon-modified carbohydrate surfactants IX: Dynamic wetting of a perfluorinated solid surface by solutions of a siloxane surfactant above and belowthe critical micelle concentration

The dynamic wetting behaviour on a perfluorinated, low-energy solid has bee n investigated for a carbohydrate-modified phenylsiloxane surfactant. The s urfactant concentration, the rate of interface generation and the [solid/li quid interface area] : [liquid/vapour interface area] ratio were varied sys tematically, Dynamic data for the liquid/vapour (gamma(lv)) and solid/liqui d (gamma(sl)) interfacial tension as well as their Lifshitz-van der Waals a nd donor-acceptor contributions were determined under strictly controlled c onditions. Since gamma(sl) reacts sensitively to variations of the surfacta nt concentration and the rate of interface generation, the covering of the liquid/nonpolar solid interface is assumed to be a spreading Limiting facto r. The corresponding gamma(lv) values remain constant and close to those ob tained under equilibrium conditions. (C) 1998 John Whey & Sons, Ltd.