Variation of longitudinal acoustic velocity at gigahertz frequencies with water content in rat-tail tendon fibers
✍ Scribed by Stephen Cusack; Sidney Lees
- Book ID
- 102763632
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1984
- Tongue
- English
- Weight
- 745 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
Brillouin scattering was used to determine the longitudinal acoustic velocity along the axis of collagen fibers as the relative humidity decreased from 95 to 0%. Between 0 and 8676, the velocity decreased linearly a t a modest rate. Above 8696, the decrease was steep. The changing mass of the absorbed water accounts for most of the velocity change in the lowerhumidity range. The remaining deviation is probably due to variation of the elastic coupling between molecules. At low humidity, the adsorbed water is known to be attached to the collagen molecules, whereas the additionally adsorbed water a t high humidity has the properties of bulk liquid. The high-humidity sonic velocity variation is ascribed to the presence of free water. It is possible to identify the five water regimes of Pineri et al. [(1978) Biopolymers 17,2799-28151 with the variations of the sonic velocity with water content.