Jump to main content
Jump to site search

Issue 98, 2015
Previous Article Next Article

Conditions for spontaneous oil–water separation with oil–water separators

Author affiliations

Abstract

Separating oil and water from oil-in-water or water-in-oil systems is immensely important. Such separation is typically achieved through specially fabricated surfaces that demonstrate distinct differences in wettability between water and the specified oil; in other words, these surfaces are either hydrophobic–oleophilic or hydrophilic–oleophobic. While this difference is sufficient to trigger the separation – and this has been the fundamental basis of preparing all surfaces meant for oil–water separation – the spontaneity of the separation process is not a single-valued function of this difference. Considering the free energy change associated with the separation process as an indicator of the extent of the spontaneity of the separation, we show that this spontaneity is additionally dictated by the oil–water interfacial tension. More intriguingly our analysis establishes that for a hydrophobic–oleophilic surface, the separation of oil from oil-in-water systems is more spontaneous than the separation of water from water-in-oil systems, whereas for a hydrophilic–oleophobic surface the separation of oil from oil-in-water systems is less spontaneous than the separation of water from water-in-oil systems.

Graphical abstract: Conditions for spontaneous oil–water separation with oil–water separators

Back to tab navigation

Article information


Submitted
10 Aug 2015
Accepted
08 Sep 2015
First published
08 Sep 2015

RSC Adv., 2015,5, 80184-80191
Article type
Paper

Conditions for spontaneous oil–water separation with oil–water separators

S. Sinha, K. A. Mahmoud and S. Das, RSC Adv., 2015, 5, 80184
DOI: 10.1039/C5RA16096K

Social activity

Search articles by author

Spotlight

Advertisements