Droplet spreading on microstriped surfaces

J. Léopoldès, D. G. Bucknall

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

When a droplet of fluid is deposited on a surface with chemical and/or topological patterns, its static shape is highly dependent on the 2D distribution of the patterns. In the case of chemical stripes, three distinct spreading regimes have been observed as a function of wettability contrast between the two kind of stripes. For low wettability contrast, the droplet spreads with different velocities and both types of surface energy and the macroscopic contact angle is close to Cassie's contact angle. When the wettability contrast is intermediate/high, the resulting shape of the droplets is elongated. In the intermediate wettability contrast regime, an ideal situation shows stick and slip behavior of the contact line, during which the contact line jumps from one stripe to another. For a high wettability contrast, the confinement of the fluid between two chemical stripes leads to a 2D spreading.

Original languageEnglish
Pages (from-to)8973-8977
Number of pages5
JournalJournal of Physical Chemistry B
Volume109
Issue number18
Early online date8 Apr 2005
DOIs
Publication statusPublished - 12 May 2005

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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