Ak. Vanjara et Sg. Dixit, ADSORPTION OF ALKYLTRIMETHYLAMMONIUM BROMIDE AND ALKYLPYRIDINIUM CHLORIDE SURFACTANT SERIES ON POLYTETRAFLUOROETHYLENE POWDER, Journal of colloid and interface science, 177(2), 1996, pp. 359-363
The adsorption and zeta potential of three different alkyltrimethylamm
onium bromides, CTAB, TTAB, and DTAB, and two alkylpyridinium chloride
s, CPC and DPC, on a PTFE surface were studied. Adsorption isotherms h
aving characteristics similar to those of two plateau regions were obs
erved for all these surfactants. In the case of alkyltrimethylammonium
bromide, there is a considerable effect of chain length which could b
e attributed to the arrangement of surfactant molecules being tilted a
way from the perpendicular. In the case of alkylpyridinium surfactants
, an insignificant effect of chain length is due to a predominantly pe
rpendicular arrangement. The thermodynamics of hemimicellization has b
een described by evaluating nh, as well as free energy of hemimicelliz
ation. (C) 1996 Academic Press, Inc.