Light scattering study of viscoelastic properties of a liquid Gallium surface

Abstract

Articles you may be interested inHigh-precision instrument for measuring the surface tension, viscosity and surface viscoelasticity of liquids using ripplon surface laser-light scattering with tunable wavelength selection Rev. Sci. Instrum. 85, 044904 (2014); 10.1063/1.4871992 Ripplon on high viscosity liquid Rev. Sci. Instrum. 80, 014902 (2009); 10.1063/1.3072604 Shear small-angle light scattering studies of shear-induced concentration fluctuations and steady state viscoelastic properties Effects of viscoelasticity of bulk polymer solution on the surface modes as probed by laser light scatteringHigh frequency capillary waves on a liquid Gallium surface were studied by quasi-elastic light scattering spectroscopy. The observed damping constants of the waves differ greatly from the predictions of classical theoretical treatment of the surface as that of a simple liquid. This is explained in terms of the presence of a surface layer possessing visco-elastic properties which are extracted from the fit of experimental spectra using different theoretical forms. One of the most important results of the data analysis is that the surface dilational viscosity appears to be negative. This result implies that the widely used phenomenological theoretical model should be replaced by one taking into account processes of adsorption and diffusion. © 1997 American Institute of Physics. ͓S0021-9606͑97͒50912-3͔ ⌫ϭq 2 , ͑2͒ 5816