Session U21: Surfaces and Interfaces I
8:00 AM–10:48 AM, Thursday, March 13, 2008
Morial Convention Center Room: 213
Sponsoring Unit:
DCP
Chair: Arthur Reber, Virginia Commonwealth University
Abstract ID: BAPS.2008.MAR.U21.10
Abstract: U21.00010 : Effective interfacial tension between miscible fluids
9:48 AM–10:00 AM
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Abstract 
Authors:
John Pojman
(The University of Southern Mississippi)
Nick Bessonov
(Institute of Problems of Mechanical Engineering)
Gloria Viner
(The University of Southern Mississippi)
Vitaly Volpert
(Universit\'e Lyon I)
Isobutyric acid (IBA) and water have an Upper Critical Solution Temperature of 27 C. Using spinning drop tensiometry, we were able to demonstrate the existence of an effective interfacial tension by preparing a drop of isobutyric acid-rich phase below the UCST and then raising the temperature above the UCST. The capillary instability was also observed by rapidly reducing the rotation rate. We also demonstrated that such an effective interfacial tension is not unique to the IBA-water systems but can also occur in the cyclohexane -- aniline, which has a Lower Critical Solution Temperature.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.U21.10