Evaporation of microdroplets of azeotropic liquids

S. M. Rowan, Michael Newton, F. W. Driewer, Glen McHale

Research output: Contribution to journalArticlepeer-review

Abstract

This work reports data showing the evolution of contact angle with time for mixtures of water and 1-propanol at room temperature on poly(methyl methacrylate) (PMMA). The composition range investigated spans the azeotropic composition, thus encompassing systems containing excess water and excess 1-propanol. A discontinuity in the contact angle behavior is observed and it is suggested that this enables the identification of the azeotropic composition as 0.39 mole fraction of 1-propanol. This suggestion is supported by boiling point measurements made at around 20 mmHg. The discontinuity is associated with the presence of an instability, which causes a distortion around the droplet perimeter. It is suggested that the distortion is caused by competing effects of local surface tension maxima and minima.
Original languageEnglish
Pages (from-to)8217-8220
Number of pages4
JournalJournal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry)
Volume104
Issue number34
DOIs
Publication statusPublished - 31 Aug 2000

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