Journal
EUROPHYSICS LETTERS
Volume 63, Issue 6, Pages 902-907Publisher
E D P SCIENCES
DOI: 10.1209/epl/i2003-00607-5
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We study surfactants at the oil/water interface using Dissipative Particle Dynamics simulations at constant mu(surf)PT. 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.
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