Dynamical Model for Chemically Driven Running Droplets

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We propose coupled evolution equations for the thickness of a liquid film and the density of an adsorbate layer on a partially wetting solid substrate. Therein, running droplets are studied assuming a chemical reaction underneath the droplets that induces a wettability gradient on the substrate and provides the driving force for droplet motion. Two different regimes for moving droplets -- reaction-limited and saturated regime -- are described. They correspond to increasing and decreasing velocities with increasing reaction rates and droplet sizes, respectively. The existence of the two regimes offers a natural explanation of prior experimental observations.
4 pages, 5 figures

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Soft Condensed Matter, Chemical Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/23443

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0403043
 http://arxiv.org/abs/cond-mat/0403043
 Phys. Rev. Lett. 93, 027802 (2004)
 doi:10.1103/PhysRevLett.93.027802

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arXiv