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Materials 2016, 9(3), 177; doi:10.3390/ma9030177

Image Charge Effects in the Wetting Behavior of Alkanes on Water with Accounting for Water Solubility

A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky prospect 31 bldg. 4, 119071 Moscow, Russia
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Academic Editor: Jordi Faraudo
Received: 4 January 2016 / Revised: 28 February 2016 / Accepted: 29 February 2016 / Published: 8 March 2016
(This article belongs to the Special Issue Surface Forces and Thin Liquid Films)
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Abstract

Different types of surface forces, acting in the films of pentane, hexane, and heptane on water are discussed. It is shown that an important contribution to the surface forces originates from the solubility of water in alkanes. The equations for the distribution of electric potential inside the film are derived within the Debye-Hückel approximation, taking into account the polarization of the film boundaries by discrete charges at water-alkane interface and by the dipoles of water molecules dissolved in the film. On the basis of above equations we estimate the image charge contribution to the surface forces, excess free energy, isotherms of water adsorption in alkane film, and the total isotherms of disjoining pressure in alkane film. The results indicate the essential influence of water/alkane interface charging on the disjoining pressure in alkane films, and the wettability of water surface by different alkanes is discussed. View Full-Text
Keywords: disjoining pressure; surface forces; contact angle; discrete charges; pentane; hexane; heptane; film stability; electrostatic interactions disjoining pressure; surface forces; contact angle; discrete charges; pentane; hexane; heptane; film stability; electrostatic interactions
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Emelyanenko, K.A.; Emelyanenko, A.M.; Boinovich, L.B. Image Charge Effects in the Wetting Behavior of Alkanes on Water with Accounting for Water Solubility. Materials 2016, 9, 177.

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