Article thumbnail

Two-Dimensional Correlation Analysis of Temperature-Dependent FT-IR Spectra of Oleic Acid

By Miriam Unger, Deepika Chaturvedi, Soni Mishra, Poonam Tandon and Heinz W Siesler

Abstract

In the present study, variable temperature FT-IR spectroscopic investigations were used to characterize the spectral changes in oleic acid during heating oleic acid in the temperature range from -30 degrees;C to 22 degrees C. In order to extract more information about the spectral variations taking place during the phase transition process, 2D correlation spectroscopy (2DCOS) was employed for the stretching (C?O) and rocking (CH2) band of oleic acid. However, the interpretation of these spectral variations in the FT-IR spectra is not straightforward, because the absorption bands are heavily overlapped and change due to two processes: recrystallization of the ?-phase and melting of the oleic acid. Furthermore, the solid phase transition from the ?- to the a-phase was also observed between -4 degrees C and -2 degrees C. Thus, for a more detailed 2DCOS analysis, we have split up the spectral data set in the subsets recorded between -30 degrees C to -16 degrees C, -16 degrees C to 10 degrees C, and 10 degrees C to 22 degrees C. In the corresponding synchronous and asynchronous 2D correlation plots, absorption bands that are characteristic of the crystalline and amorphous regions of oleic acid were separated

Topics: Inorganic & Physical Chemistry
Publisher: TAYLOR & FRANCIS INC
Year: 2013
DOI identifier: 10.1080/00387010.2012.659368
OAI identifier: oai:eprints.iisc.ac.in:45962
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://eprints.iisc.ac.in/4596... (external link)
  • http://eprints.iisc.ac.in/4596... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.