Volume 63, Number 6, September 2003
|Page(s)||902 - 907|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 November 2003|
Effect of surfactant structure on interfacial properties
Department of Chemistry, Norwegian University of Science and Technology N-7491 Trondheim, Norway
2 Department of Chemical Engineering, University of Amsterdam Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
Corresponding author: email@example.com
Accepted: 11 July 2003
We study surfactants at the oil/water interface using Dissipative Particle Dynamics simulations at constant . The interfacial tension depends on the surfactant branching in a subtle way. For a given interfacial concentration, a double-tail surfactant is more efficient than its single-tail isomer only if the oil-head repulsion is sufficiently strong. For a given concentration in the bulk water phase, the single-tail surfactants are more efficient in both cases. We interpret these results in light of the molecular packing at the interface and free-energy considerations.
PACS: 82.70.Uv – Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems (hydrophilic and hydrophobic interactions) / 68.05.-n – Liquid-liquid interfaces
© EDP Sciences, 2003
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