ADSORPTION-ISOTHERMS OF PERFLUOROCARBON SURFACTANTS FROM AQUEOUS AND NONAQUEOUS SOLUTIONS AND FRICTION MEASUREMENTS OF PERFLUOROSURFACTANT-ADSORBED ALUMINA
Cl. Lai et al., ADSORPTION-ISOTHERMS OF PERFLUOROCARBON SURFACTANTS FROM AQUEOUS AND NONAQUEOUS SOLUTIONS AND FRICTION MEASUREMENTS OF PERFLUOROSURFACTANT-ADSORBED ALUMINA, Colloids and surfaces. A, Physicochemical and engineering aspects, 104(2-3), 1995, pp. 231-241
The adsorption of a series of perfluorocarbon surfactants C(n)F2(n+1)C
OONa (n = 6, 7, and 8) and CnF2n+1COOH (n = 6, 7, and 8) on aluminum o
xide surfaces has been studied experimentally. Isotherms from aqueous
and non-aqueous solutions, respectively, were measured, and the effect
s of pH and fluorocarbon chain length on the adsorption behavior and t
he maximum level of adsorption determined. Contact angles and friction
coefficients for adsorbed films of surfactant on alumina chips were a
lso measured as a function of pH and surfactant concentration. Frictio
n coefficients were reduced while contact angles increased.