Dynamic surface tension and adsorption mechanisms of surfactants at the air-water interface.
Recent advances in understanding dynamic surface tensions (DSTs) of surfactant solutions are discussed. For pre-CMC solutions of non-ionic surfactants, theoretical models and experimental evidence for a mixed diffusion-kinetic adsorption mechanism are covered. For micellar solutions of non-ionics, up to approximately 100 x CMC, the DST behaviour can also be accounted for using a mixed mechanism model. Finally, the first reported measurements of the dynamic surface excess Gamma(t), using the overflowing cylinder in conjunction with neutron reflection, are described.
Eastoe
J
J
University of Bristol, School of Chemistry, Cantock's Close, UK. julian.eastoe@bris.ac.uk
Dalton
J S
JS
D000327:Adsorption; D000388:Air; D004058:Diffusion; D004492:Edetic Acid / Q000494:pharmacology; D004573:Electrolytes / Q000494:pharmacology; D007700:Kinetics; D008823:Micelles; D008956:Models, Chemical; D009502:Neutrons; D009994:Osmolar Concentration; D013500:Surface Tension; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D014867:Water; D017155:Wettability
D004573:Electrolytes; D008823:Micelles; D013501:Surface-Active Agents; D014867:Water; D004492:Edetic Acid