Abstract
AbstractNew results of measurements of the temperature dependence of changes of the oscillatory frequency Δf(T) of a quartz oscillator in contact with two binary liquid mixtures of critical composition are reported (systems: 2‐butoxyethanol/water; 2,6‐dimethyl pyridine/water, lower critical point). Both systems exhibit an unexpected Δf(T) behaviour approaching the critical temperature. The results lead to the conclusion that even near the critical temperature Δf(T) is determined only by the background viscosity of the systems. The influence of critical contributions to the viscosity can be neglected. It is assumed that this effect is caused by the large shear gradient produced by the quartz oscillator.
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