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Dependence of Volatile Droplet Lifetime on the Hydrophobicity of the Substrate

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Original languageEnglish
Pages (from-to)4572-4577
Number of pages6
JournalLangmuir
Volume27
Issue number8
DOIs
Publication statusPublished - Jan 2011

Abstract

In this Article, we demonstrate the dependence of the lifetime of a volatile droplet on the hydrophobicity of the substrate. Ethanol droplets placed on the molecularly smooth surfaces of three polymers, applied to substrates by spin-coating, showed distinct types of behavior depending on the hydrophobicity of the latter. High contact angles, theta, lead to fairly regular recession of the triple line during liquid evaporation at essentially constant theta, whereas low contact angle caused pinning, theta decreasing with time. The latter case leads to shorter drop lifetimes.

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