A viscosity measurement during the high pressure phase transition in triolein

The high-pressure properties of triolein, a subject of extensive research at the Faculty of Physics of Warsaw University of Technology (WUT) have been enhanced by the results of viscosity measurement within the pressure range up to 0.8 GPa. For the measurement the authors have adopted a new ultrason...

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Published inJournal of physics. Conference series Vol. 121; no. 14; p. 142010
Main Authors Siegoczyński, R M, Rostocki, A J, Kielczyński, P, Szalewski, M
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.07.2008
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ISSN1742-6596
1742-6588
1742-6596
DOI10.1088/1742-6596/121/14/142010

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Summary:The high-pressure properties of triolein, a subject of extensive research at the Faculty of Physics of Warsaw University of Technology (WUT) have been enhanced by the results of viscosity measurement within the pressure range up to 0.8 GPa. For the measurement the authors have adopted a new ultrasonic method based on Bleustein-Gulyaev waves, successfully developed earlier for the low pressures in the Section of Acoustoelectronics of the Institute of Fundamental Technological Research. The measurements have shown: 1. Exponential rise of viscosity with pressure up to 0.5 GPa. 2. Extraordinary increment of viscosity at constant pressure during phase transition. 3. Further exponential rise of viscosity with pressure of the high-pressure phase of triolein. 4. The pressure exponents of the viscosity of both phases were different (the high-pressure phase had much smaller exponent). 5. The decomposition of the high pressure phase due to the slow decompression have shown very large hysteresis of viscosity on pressure dependence.
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ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/121/14/142010