Abstract
Advances in techniques for investigating dynamic adsorption of surfactants at the air-water interface are discussed. Of particular interest are the maximumbubble-pressure method, and the interrogation of adsorption layers on an overflowing cylinder (OFC) cell using ellipsometry, surface-light scattering, laser Doppler velocimetry and neutron reflection. Recent studies described here, with a model di-chain anionic fluorocarbon surfactant sodium bis(1H, 1H-nonafluoron-pentyl) sulphosuccinate (di-CF4) demonstrate that the OFC presents an ideal flexible platform for investigating dynamics of adsorption from solutions. Under certain conditions the behaviour is consistent with an activated-diffusion mechanism, as has been found previously for simple alcohols and various other non-ionic and ionic surfactants.
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