Abstract
This paper deals with dynamic light scattering from liquid films. We have obtained the thermal fluctuation power spectrum of surface waves on films by solving the electrohydrodynamic equations of motion where the interaction forces (electrical double layers repulsion and London–van der Waals attraction) are included in the momentum equation. The resulting power spectrum for the mixed transversal-longitudinal surface waves can be split up into two contributions: a squeezing mode part and a bending mode part. In this paper the general expressions for both modes are discussed for arbitrary film thicknesses and arbitary frequencies in the hydrodynamic regime. When the film is thick the spectrum exhibits the well known two peak structure of a single fluid interface. When the film becomes thin the spectrum consists of three peaks for each mode, i.e., the time evolution of both modes comprises a purely diffusive and a propagating component. It is found that the squeezing mode shows an intense diffusive peak, whereas for the bending mode the propagating peak is strong compared with the diffusive peak.
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Dates
Type | When |
---|---|
Created | 22 years, 6 months ago (Feb. 28, 2003, 12:18 p.m.) |
Deposited | 1 year, 6 months ago (Feb. 9, 2024, 9 p.m.) |
Indexed | 1 year, 6 months ago (Feb. 10, 2024, 12:28 a.m.) |
Issued | 41 years, 5 months ago (March 15, 1984) |
Published | 41 years, 5 months ago (March 15, 1984) |
Published Print | 41 years, 5 months ago (March 15, 1984) |
@article{Joosten_1984, title={Spectral analysis of light scattered by liquid films. I. General considerations}, volume={80}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.446988}, DOI={10.1063/1.446988}, number={6}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Joosten, J. G. H.}, year={1984}, month=mar, pages={2363–2382} }