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Issue 30, 2012
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Evaporation control of sessile water drops by soft viscoelastic surfaces

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Abstract

In this paper the evaporation of sessile water drops on soft viscoelastic substrates is investigated. We demonstrate how the deformation of the substrate close to the triple-phase contact line influences the evaporation of a sessile drop by using surfaces with similar wettability, but different viscoelastic properties. We show that water drops on soft surfaces (Young's modulus ∼ 0.02 MPa) evaporate faster than those on hard surfaces (Young's modulus ∼ 1.5 MPa). The faster evaporation rates on soft surfaces can be related to a different dynamic evolution of the receding contact angle, which is a direct consequence of the substrate deformation close to the triple-phase contact line. By adjusting the substrate softness we are able to control the transition between constant contact radius and constant contact angle evaporation modes.

Graphical abstract: Evaporation control of sessile water drops by soft viscoelastic surfaces

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Publication details

The article was received on 25 Apr 2012, accepted on 31 May 2012 and first published on 28 Jun 2012


Article type: Paper
DOI: 10.1039/C2SM25958C
Soft Matter, 2012,8, 7875-7881

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    Evaporation control of sessile water drops by soft viscoelastic surfaces

    M. C. Lopes and E. Bonaccurso, Soft Matter, 2012, 8, 7875
    DOI: 10.1039/C2SM25958C

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