Abstract
We present experimental investigations of the spreading of nonvolatile liquids (polydimethylsiloxane drops) on smooth horizontal silicon wafers. We distinguish the macroscopic part of the drop, which can be seen by bare eye (or through a microscope) from the microscopic part, or precursor film, which progressively develops, like a liquid tongue (thickness smaller than 1000 Å) all around the drop. The spreading kinetics of the macroscopic drop appears independent of the spreading parameter, in contrast to the precursor film which is deeply influenced by the surface energies. We have characterized this precursor film (both its profile and its evolution) by optical techniques. The results are compared with the recent de Gennes and Joanny’ theoretical predictions, and specific polymeric effects are pointed out.
*Assocaited with CNRS, UA 792
**LEP is a member of the PHILLIPS RESEARCH ORGANIZATION
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© 1989 Plenum Press, New York
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Léger, L., Guinet-Picard, A.M., Hervet, H., Ausserre, D., Erman, M. (1989). Dry Spreading of Polymer Liquids on Solid Surfaces: Role of Long Range Forces, Precursor Film Profiles and Specific Polymeric Effects. In: Lee, LH. (eds) New Trends in Physics and Physucal Chemistry of Polymers. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0543-9_13
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DOI: https://doi.org/10.1007/978-1-4613-0543-9_13
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