Journal
COLLOID AND POLYMER SCIENCE
Volume 285, Issue 15, Pages 1699-1705Publisher
SPRINGER
DOI: 10.1007/s00396-007-1747-0
Keywords
dynamic surface tension; adsorption kinetics; C8E4; nonionic surfactant
Categories
Ask authors/readers for more resources
The dynamic surface tension of the aqueous solutions of tetraethyleneglycol monooctyl ether (C8E4), a nonionic surfactant, was measured at different concentrations and temperatures. Present data at 298.15 K clearly indicate that the mechanism of adsorption is purely diffusion controlled at low concentrations (0.1 similar to 0.4 mmol/kg), and there is a switchover in adsorption mechanism to the mixed diffusion-kinetic control at higher concentrations. The calculated activation energies increase with concentration, and thus, with surface density, but decrease with temperature. The magnitude of activation energy and its increase with surface density suggest that the barrier is due to the free surface site formation by overcoming mainly the attractive van der Waals forces between the chain of adsorbed C8E4 molecules.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available