Evaporation of Microdroplets of Azeotropic Liquids

Rowan, S. M., Newton, Michael, Driewer, F. W. and McHale, Glen (2000) Evaporation of Microdroplets of Azeotropic Liquids. The Journal of Physical Chemistry B, 104 (34). pp. 8217-8220. ISSN 1520-6106

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Official URL: https://doi.org/10.1021/jp000938e


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.

Item Type: Article
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 09 Jun 2017 10:20
Last Modified: 12 Oct 2019 19:05
URI: http://nrl.northumbria.ac.uk/id/eprint/31017

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