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Growth Rate of Pressure‐Induced Triolein Crystals
Author(s) -
Roßbach André,
Bahr Leo A.,
Gäbel Sebastian,
Braeuer Andreas S.,
Wierschem Andreas
Publication year - 2019
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1002/aocs.12161
Subject(s) - triolein , growth rate , raman spectroscopy , nucleation , crystal growth , crystal (programming language) , materials science , crystallography , thermodynamics , analytical chemistry (journal) , chemistry , optics , chromatography , organic chemistry , mathematics , programming language , physics , geometry , computer science , lipase , enzyme
In pressure‐induced crystal growth of triolein from melt at pressures up to 300 MPa and at temperatures between 283.16 and 293.16 K, we can distinguish three different crystal morphologies. Raman spectroscopy indicates that they are related to different polymorphic structures. Switching from the most stable to a less‐stable structure implies a jump in the growth rate to a maximum value. As pressure increases, the growth rate decreases indicating that the growth is transport limited. Measurements at different temperatures show that the growth rate is mainly governed by pressure. In a certain parameter range, we observe cross‐nucleation to crystals with a higher growth rate. These crystals have a Raman fingerprint not yet described in the literature.