Brillouin-scattering study of hyaluronic acid

Dynamic coupling with the water of hydration and phase transitions

S. A. Lee, M. R. Flowers, W. F. Oliver, A. Rupprecht, Stuart Lindsay

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Brillouin spectra have been measured from wet-spun films of Li and Na hyaluronate (NaHA) between 0% and 93% relative humidity (RH). The speed of sound is very high (about 5 km/s) in both Li and NaHA films at low values of RH. The Brillouin spectra show substantial coupling between the longitudinal-acoustic phonons and a relaxation mode of the water of hydration. A coupled-modes model is used to interpret these data. This analysis shows that the relaxation time of the water of hydration (about 50 ps) is constant over the range of hydration. The microscopic coupling constant also appears to be independent of hydration. Between 84% and 88% RH, the uncoupled phonon frequency for both Li and NaHA is found to drop by 40%, and 25% for phonons propagating in the parallel and perpendicular directions, respectively, indicative of a phase transition.

Original languageEnglish (US)
Pages (from-to)677-683
Number of pages7
JournalPhysical Review E
Volume47
Issue number1
DOIs
StatePublished - 1993

Fingerprint

Brillouin Scattering
Hydration
Relative Humidity
hydration
Phase Transition
Water
humidity
acids
Phonons
scattering
water
phonons
acoustics
Phonon
Relaxation Time
Perpendicular
coupled modes
Acoustics
relaxation time
Range of data

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics

Cite this

Brillouin-scattering study of hyaluronic acid : Dynamic coupling with the water of hydration and phase transitions. / Lee, S. A.; Flowers, M. R.; Oliver, W. F.; Rupprecht, A.; Lindsay, Stuart.

In: Physical Review E, Vol. 47, No. 1, 1993, p. 677-683.

Research output: Contribution to journalArticle

Lee, S. A. ; Flowers, M. R. ; Oliver, W. F. ; Rupprecht, A. ; Lindsay, Stuart. / Brillouin-scattering study of hyaluronic acid : Dynamic coupling with the water of hydration and phase transitions. In: Physical Review E. 1993 ; Vol. 47, No. 1. pp. 677-683.
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