Micro-Brillouin Spectroscopy Applied to the Glass Transition of Anti-inflammatory Egonol
Journal of the Optical Society of Korea, Vol. 14, Issue 4, pp. 403-408 (2010)
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Abstract
The acoustic properties of anti-inflammatory egonol were investigated by using micro-Brillouin scattering spectroscopy, by use of a 6-pass tandem Fabry-Perot interferometer and an optical microscope specially modified for spectroscopic purposes. The measured Brillouin spectrum was composed of a central peak centered at zero and a Brillouin doublet arising from the longitudinal acoustic waves, i.e. propagating density fluctuations. For the first time, the glass transition of egonol was identified to be about <TEX>$5^{\circ}C$</TEX> at which the Brillouin peak position and the half width showed abrupt changes. The substantial damping of acoustic phonons of egonol near the glass transition temperature indicated that the contribution of internal relaxation processes such as small-amplitude librations of side chains to the damping of acoustic phonons may be substantial depending on the internal structure of molecules.
© 2010 Optical Society of Korea
OCIS Codes
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(290.5830) Scattering : Scattering, Brillouin
(300.6330) Spectroscopy : Spectroscopy, inelastic scattering including Raman
History
Original Manuscript: July 22, 2010
Revised Manuscript: September 6, 2010
Manuscript Accepted: September 9, 2010
Published: December 25, 2010
Citation
Tae-Hyun Kim, Jae-Hyeon Ko, Eun-Mi Kwon, and Jong-Gab Jun, "Micro-Brillouin Spectroscopy Applied to the Glass Transition of Anti-inflammatory Egonol," J. Opt. Soc. Korea 14, 403-408 (2010)
http://www.opticsinfobase.org/josk/abstract.cfm?URI=josk-14-4-403
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