Spreading kinetics of drops on glass

The spreading kinetics of drops on glass was experimentally studied. The liquids used were triply distilled water, aqueous electrolytic solutions of various pH's, low alcohols, glycerine, and squalane. A wide range of parameters was covered, including temperature, humidity, volume, viscosity, surface tension, and pH. A power law dependence of the contact area on time was elucidated in the form A = kt n . The values of n and k , and their dependence on the parameters studied are presented and discussed in comparison with previous experimental data for other systems and with existing theoretical models. The effect of the primary film on the kinetics of spreading is discussed and used to explain some of the phenomena observed.

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