Light Scattering Studies of Interfacial Rheology

Surfactant adsorption dynamics

“…Surface light scattering SLS is a modern non-perturbative technique that can determine surface tension with static or¯owing liquid surfaces [85]. The surface of a liquid consists of thermally generated capillary waves and, in the presence of an adsorbed monolayer, they may be coupled to dilational waves.…”

Surface Tension as a Complex Parameter: A Critique of Experimental Evidence from Energy Dissipation Studies on Fibers Partially Immersed at an Air/Water Interface

“…Of other viscous contributions, the large ionic double-layer potentials at the charged glass fiber interface and in the threephase lines of contact may be relevant, particularly because the Debye length for the ionic double layer in pure water approaches the magnitude of the fiber radii. 9 Studies on the effect of added rigorously purified surfactant-free electrolytes can address this possibility.…”

“…Whether dissipative terms are relevant to periodic surface stresses at the pure water/air interface is addressed by valuable new measurements on glass fibers partially immersed in water with the upper end attached to an ATM-style cantilever operated in the tapping mode and measuring the power dissipation as a function of the depth of immersion of the fiber. − The purpose of this note is to focus on these important new experiments and to indicate additional experiments at the air/water interface and at the lines of contact of the liquid surface with the fiber and the container walls and edges, which can potentially show that the observed energy dissipation in the water surface may be assigned to factors other than or additional to a complex surface tension. Extended references to relevant literature are given in refs − .…”

Phase Transition effect on the Parametric Instability of Liquid Crystals

“…Phase Transition effect on the Parametric Instability of Liquid Crystals http://dx.doi.org/10.5772/intechopen.70240experiencing thermotropic phase change were reported, and the thorough experiments by Earnshaw [55] on surfaces of water supporting monolayers of surfactants. These researches provided tabulated comprehensive data of the elastic parameters and viscous properties on bulk and in the plane of the interface in a wide range of temperatures and not only at a single specific temperature of interest.…”

“…(2). It is expected that the viscosities will help in clarifying the nature of the monolayer phases [54][55][56]. A comprehensive experimental determination of the bulk Leslie viscosities of the most known liquid crystals in an ample interval of temperatures near their critical phase transition is scarce [53].…”