Premium
Temperature dependence of the Raman spectra of amorphous glucose in the glassy and supercooled liquid states
Author(s) -
Söderholm Stefan,
Roos Yrjö H.,
Meinander Niklas,
Steinby Krister
Publication year - 2000
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/1097-4555(200011)31:11<995::aid-jrs634>3.0.co;2-l
Subject(s) - amorphous solid , glass transition , supercooling , raman spectroscopy , van der waals force , spectral line , chemistry , atmospheric temperature range , analytical chemistry (journal) , materials science , molecule , thermodynamics , crystallography , polymer , organic chemistry , optics , physics , astronomy
The Raman spectra of amorphous glucose between 300 and 4000 cm −1 over the temperature range 15–55 °C are reported. The spectra were recorded at several temperatures both below and above the glass transition temperature, T g . A two‐dimensional covariance spectrum was computed and a least‐squares analysis was used to quantify the temperature dependences observed in the spectra. Several vibrational bands were found to be sensitive to the temperature of the material. Some bands also show a changing temperature dependence around the glass transition. A Fermi‐type function was found to be suitable as an empirical phenomenological model for the observed changes in the spectra. The wavenumber shifts and intensity changes observed in the spectrum were related to the intramolecular vibrations by a normal coordinate analysis of a single glucose molecule. The spectral changes in the ν(O–H) stretching region suggest a weakening of the hydrogen bond network at the glass transition. Other observed spectral changes suggest a weakening of the van der Waals interactions with increasing temperature, but these changes seem not to be related to the glass transition. Copyright © 2000 John Wiley & Sons, Ltd.