ADSORPTION OF LINEAR ALIPHATIC-ALCOHOLS AT THE FREE-SURFACE OF DMSO -SURFACE-TENSION AND SURFACE-POTENTIAL MEASUREMENTS

The adsorption of four linear aliphatic alcohols (C-3, C-4, C-7 and C- 8) at the free surface of DMSO has been studied by measuring the surfa ce tension variation and the surface potential shift. The experimental data of surface pressure have been fitted by means of a Frumkin isoth erm. The adsorption parameters are discussed in terms of (i) surface d istribution and orientation of adsorbate molecules, (ii) Gibbs energy of adsorption, and (iii) lateral interactions. Presumable adsorption m odes are pointed out. The adsorption potential shift is discussed with the aid of recent models. (C) 1997 Published by Elsevier Science Ltd.