Wetting and evaporation of binary mixture drops

The Journal of Physical Chemistry. B
K SefianeMartin E R Shanahan

Abstract

Experimental results on the wetting behavior of water, methanol, and binary mixture sessile drops on a smooth, polymer-coated substrate are reported. The wetting behavior of evaporating water/methanol drops was also studied in a water-saturated environment. Drop parameters (contact angle, shape, and volume) were monitored in time. The effects of the initial relative concentrations on subsequent evaporation and wetting dynamics were investigated. Physical mechanisms responsible for the various types of wetting behavior during different stages are proposed and discussed. Competition between evaporation and hydrodynamic flow are evoked. Using an environment saturated with water vapor allowed further exploration of the controlling mechanisms and underlying processes. Wetting stages attributed to differential evaporation of methanol were identified. Methanol, the more volatile component, evaporates predominantly in the initial stage. The data, however, suggest that a small proportion of methanol remained in the drop after the first stage of evaporation. This residual methanol within the drop seems to influence subsequent wetting behavior strongly.

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Citations

Aug 30, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Daniel OrejonMartin E R Shanahan
Nov 29, 2008·Physical Chemistry Chemical Physics : PCCP·Chuanjun LiuHans-Jürgen Butt
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May 28, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Chin Hong OoiNam-Trung Nguyen
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Jun 1, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Gang Pu, Steven J Severtson
Jul 4, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Wuguo BiEdwin K L Yeow
Aug 14, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Jeng-Lung LinYing-Chih Liao
Jan 28, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Yoshimune NonomuraHiroyuki Mayama
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