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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Chemically Directed Movement of Drops on Self-Assembled Monolayers

Get access (open in a dialog) DOI: 10.1615/IHTC12.5150
6 pages

摘要

We report studies of reactive wetting employing droplets of a non-polar liquid (decahydronaphthalene) on chemically patterned surfaces. The drops contain an n-alkylamine that adsorbs onto surfaces exposing carboxylic acid groups and produces surfaces exposing methyl groups. The change in surface energy that occurs concurrent with the formation of an oriented monomolecular film of alkylamine during this process is sufficient to produce a self-propelled movement of decahydronaphthalene drops on the surface. We employed patterning to direct the movement of the drops on the surface, thereby allowing measurements of the relationships between the macroscopic fluidic behavior of the droplets and microscopic adsorption events. Thermodynamic argument can be applied to describe the system. The present analysis provides an alternative method to enhance heat transfer by droplet circulation on solid surfaces without external pumps or electric field.