Influence of high pressure on the relative permittivity of oleic acid

Rafał Kościesza , Ryszard Siegoczyński

Abstract

Oleic acid (OA) is a monounsaturated omega-9 fatty acid which undergoes a first-order phase transition when it is influenced by high pressures. The transition results in a change of molecular structure, which was investigated by means of X-ray techniques [J. Przedmojski and R.M. Siegoczynski, X-ray diffraction investigation of oleic acid under high pressure, Phase Transit. 75 (2002), pp. 373-377]. Despite a significant change in the structure, the permittivity of the acid remains barely influenced during and after the phase transition. A rise in relative permittivity has been observed due to the increasing number of molecules per volume unit within a compression cycle. However, no significant fall in the permittivity has been observed as a result of the transition which occurs in the case of edible oils. This may be caused by a strongly dimerised structure and dipole-dipole interaction in the liquid at ambient pressure. © 2011 Taylor & Francis.

Author Rafał Kościesza (FP / SRD)
Rafał Kościesza,,
- Structural Research Division
, Ryszard Siegoczyński (FP / SRD)
Ryszard Siegoczyński,,
- Structural Research Division
Journal seriesHigh Pressure Research, ISSN 0895-7959, (A 25 pkt)
Issue year2011
Vol31
No1
Pages237-242
Publication size in sheets0.5
ASJC Classification3104 Condensed Matter Physics
DOIDOI:10.1080/08957959.2010.541243
Languageen angielski
Score (nominal)25
Score sourcejournalList
Publication indicators Scopus Citations = 1; WoS Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2011 = 0.676; WoS Impact Factor: 2011 = 0.778 (2) - 2011=0.932 (5)
Citation count*1 (2015-02-08)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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