Pressure-induced Phase Transition in Oleic Acid Studied by Raman Spectroscopy
FAN Ya1,2, ZHOU Jing1, LI Shuang2, GUAN Fu-Ying3, XU Da-Peng1**
1State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012 2Department of Physics, Changchun University of Science and Technology, Changchun 130022 3Library, Beijing Normal University, Beijing 100875
Pressure-induced Phase Transition in Oleic Acid Studied by Raman Spectroscopy
FAN Ya1,2, ZHOU Jing1, LI Shuang2, GUAN Fu-Ying3, XU Da-Peng1**
1State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012 2Department of Physics, Changchun University of Science and Technology, Changchun 130022 3Library, Beijing Normal University, Beijing 100875
摘要High-pressure Raman studies up to 0.84 GPa are performed on oleic acid. Spectral analysis indicates that oleic acid undergoes a pressure-induced phase transition in the 0.29–0.36 GPa range. Only one high-pressure phase below 0.84 GPa is present, in which the polymethylene chains take the ordered all-trans conformation, with the methyl end of the chains exhibiting the ordered tt chain−end conformation and the olefin group taking the skew-cis−skew' conformation. The conformational characters of the oleic acid molecule show that the high-pressure phase is the same as the low-temperature crystalline γ phase. The pressure-induced phase transition is typical of first-order transitions and the transition path during compression is different from that during cooling.
Abstract：High-pressure Raman studies up to 0.84 GPa are performed on oleic acid. Spectral analysis indicates that oleic acid undergoes a pressure-induced phase transition in the 0.29–0.36 GPa range. Only one high-pressure phase below 0.84 GPa is present, in which the polymethylene chains take the ordered all-trans conformation, with the methyl end of the chains exhibiting the ordered tt chain−end conformation and the olefin group taking the skew-cis−skew' conformation. The conformational characters of the oleic acid molecule show that the high-pressure phase is the same as the low-temperature crystalline γ phase. The pressure-induced phase transition is typical of first-order transitions and the transition path during compression is different from that during cooling.
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2011, Vol. 28 
