Dilational Viscosity of Langmuir monolayers

Details Dilational Viscosity of Langmuir monolayers Dilational Viscosity of Langmuir monolayers

1999-03-17

arxiv.org/abs/cond-mat/9903268v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 2 Postscript figures, submitted to Physica A (September 1998)

Scientific paper

10.1016/S0378-4371(99)00198-3

The dilational viscosity $\epsilon'$ 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 $\partial\gamma/\partial Q$, is in good accord with the experimentally observed $\epsilon'$. The sign of $\epsilon'$ is positive that indicates that increased in-plane ordering increases the surface tension.

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