Dilational Viscosity of Langmuir monolayers
V. Kolevzon
Abstract
The dilational viscosity ε' of Langmuir monolayer is considered in a theoretical model taking into account an orientational effect of the dilational wave on surface molecules. This orientational order is described by the surface order parameter Q; the orientational part of the free surface energy is given by Landau's expansion in powers of Q. The magnitude of surface viscosity, driven by the surface tension derivative ∂γ/∂ Q, is in good accord with the experimentally observed ε'. The sign of ε' is positive that indicates that increased in-plane ordering increases the surface tension.
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