Quasi-elastic laser scattering

Dynamic Behaviors of Molecules at Liquid-Liquid Interfaces Using the Time-Resolved Quasi-Elastic Laser Scattering Method... 

II. QUASI-ELASTIC LASER SCATTERING METHOD A. Capillary Waves... 

FIGURE 3.1. Principle of the quasi-elastic laser scattering method. 

Quasi-elastic Laser Scattering (QELS) provides a versatile tool for monitoring in situ the frequency of thermally induced capillary waves at the Uquid/hquid junction [26, 27]. Unlike the previous techniques based on an absorption/fluores-cence signal arising from molecular probes at the interface, QELS is not sensitive to specific molecules but to the interfacial tension of the molecular junc-... 

Time-resolved quasi-elastic laser scattering (QELS) experiments [306, 307] allow the measurement of the dispersion law (the relation between the frequency of capillary waves, co, and their wavelength, In/k). To derive the dispersion law theoretically, one must consider the dynamics of the two degrees of freedom - the position of the surface, z = (x, y, t), and the fluid velocity. In the limit of small viscosity, such a theory [291] gives... 

The specific adsorption of porphyrins at the liquid/liquid boundary has also been addressed by surface tension measurements. Quasi-elastic laser scattering... 

Tsuyumoto, I. and T. Sawada (2001). Dynamic behaviors of molecules at liquid-liquid interfaces using the time-resolved quasi-elastic laser scattering method. In A. Volkov, (ed), Liquid Interfaces in Chemical, Biological, and Pharmaceutical Applications. Marcel Dekker, Boca Raton, pp. 229-239. 

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