We present investigations of the spreading behavior of nonvolatile liquids (high-molecular-weight polydimethylsiloxane) on smooth horizontal surfaces, and establish the following: (1) the existence of a thin precursor film extending progressively ahead of the macroscopic front of the drops, and that we directly visualize by polarized reflection microscopy; (2) the universality of the spreading kinetics, followed by means of simultaneous size and contact-angle measurements, which appears insensitive to the spreading parameter S. Both points give strong experimental support to recent theoretical developments.
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Ausserré et al. (1986) studied this question.
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