Evaporation-induced foam stabilization in lubricating oils

Proceedings of the National Academy of Sciences of the United States of America
V Chandran SujaG G Fuller

Abstract

Foaming in liquids is ubiquitous in nature. Whereas the mechanism of foaming in aqueous systems has been thoroughly studied, nonaqueous systems have not enjoyed the same level of examination. Here we study the mechanism of foaming in a widely used class of nonaqueous liquids: lubricant base oils. Using a newly developed experimental technique, we show that the stability of lubricant foams can be evaluated at the level of single bubbles. The results obtained with this single-bubble technique indicate that solutocapillary flows are central to lubricant foam stabilization. These solutocapillary flows are shown to originate from the differential evaporation of multicomponent lubricants-an unexpected result given the low volatility of nonaqueous liquids. Further, we show that mixing of some combinations of different lubricant base oils, a common practice in the industry, exacerbates solutocapillary flows and hence leads to increased foaming.

References

Aug 23, 2002·Nature·Grant B Deane, M Dale Stokes
Oct 20, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Nikolai D Denkov
Feb 7, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Xueliang LiPaul Stevenson
Oct 19, 2016·Soft Matter·John M FrostadGerald G Fuller
Nov 1, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·V Chandran SujaG G Fuller

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Citations

Jun 9, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·E J MossigeGerald G Fuller
Jul 11, 2020·Scientific Reports·V Chandran SujaG G Fuller
Aug 14, 2020·Soft Matter·Emmanouil ChatzigiannakisJan Vermant
Nov 9, 2020·Advances in Colloid and Interface Science·V Chandran SujaG G Fuller
Oct 24, 2020·Physical Review Letters·Emmanouil Chatzigiannakis, Jan Vermant
Mar 4, 2021·Molecular Pharmaceutics·Aadithya KannanGerald G Fuller
Apr 12, 2021·Advances in Colloid and Interface Science·Bernard P Binks, Badri Vishal
Apr 20, 2021·Soft Matter·Emmanouil Chatzigiannakis, Jan Vermant
Jun 18, 2021·Proceedings of the National Academy of Sciences of the United States of America·Chrystian OchoaVivek Sharma
Jun 9, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Omer AtasiBenoit Scheid

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