Evidence for the existence of an effective interfacial tension between miscible fluids: isobutyric acid-water and 1-butanol-water in a spinning-drop tensiometer

Langmuir : the ACS Journal of Surfaces and Colloids
John A PojmanBrian D Zoltowski

Abstract

We report definitive evidence for an effective interfacial tension between two types of miscible fluids using spinning-drop tensiometry (SDT). Isobutyric acid (IBA) and water have an upper critical solution temperature (UCST) of 26.3 degrees C. We created a drop of the IBA-rich phase in the water-rich phase below the UCST and then increased the temperature above it. Long after the fluids have reached thermal equilibrium, the drop persists. By plotting the inverse of the drop radius cubed (r(-)(3)) vs the rotation rate squared (omega(2)), we confirmed that an interfacial tension exists and estimated its value. The transition between the miscible fluids remained sharp instead of becoming more diffuse, and the drop volume decreased with time. We observed droplet breakup via the Rayleigh-Tomotika instability above the UCST when the rotation rate was decreased by 80%, again demonstrating the existence of an effective interfacial tension. When pure IBA was injected into water above the UCST, drops formed inside the main drop even as the main drop decreased in volume with time. We also studied 1-butanol in water below the solubility limit. Effective interfacial tension values measured over time were practically constant, while the int...Continue Reading

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Jan 24, 2014·Biomicrofluidics·Yang SongHo Cheung Shum
Nov 27, 2015·Journal of Colloid and Interface Science·Ruilin Xie, Anatoliy Vorobev
Mar 2, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Takahiko BanYuichiro Nagatsu
Jul 20, 2012·Journal of Colloid and Interface Science·M S P Stevar, A Vorobev
Jun 7, 2016·Soft Matter·Domenico Truzzolillo, Luca Cipelletti
Aug 9, 2016·Journal of Colloid and Interface Science·Anatoliy Vorobev, Andrea Boghi
Dec 15, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Domenico Truzzolillo, Luca Cipelletti
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May 16, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Howard Brenner
Apr 15, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Satyajit Pramanik, Manoranjan Mishra
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Feb 10, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Rodica Borcia, Michael Bestehorn
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Aug 14, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Alessandro CarbonaroDomenico Truzzolillo
Jun 28, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Kaiqiang ZhangLirong Liu
Dec 4, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Yun ChenCari S Dutcher
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