Brillouin scattering from supercooled water

Brillouin scattering from supercooled water

2014 We present new experimental results for sound velocity and sound absorption of supercooled water in the temperature range down to 2014 20 °C. The results show a rapid variation with temperature that can be analysed according to equations analogous to the critical phenomena laws. LE JOURNAL DE PHYSIQUE LETTRES TOME 39, ler AVRIL 1978, Classification Physics Abstracts 62.60 78.35

Small-angle x-ray scattering from supercooled water.

Supercooled water escaping from metastability

The return of supercooled water to a stable equilibrium condition is an irreversible process which, in large enough samples, takes place adiabatically. We investigated this phenomenon in water by fast imaging techniques. As water freezes, large energy and density fluctuations promote the spatial coexistence of solid and liquid phases at different temperatures. Upon synchronously monitoring the ...

Brillouin scattering from cross-linked gels

In this letter we report Brillouin scattering measurements on methyl-methacrylate (MMA) gels crosslinked with varying amounts of ethylene-dimethacrylate (EDMA). We find that the k dependence of the phase velocity changes on increasing the cross-link content. For higher concentrations of crosslink we observe maxima and minima in the k dependence of the phase velocity. We associate these minima a...

Brillouin light-scattering from polymer gels

The experimental results of the Brillouin shift and width for poly(vinyl alcohol) and poly(vinyl chloride) gels as a function of gel network volume fraction have been analysed using the theory of Marqusee and Deutch for Brillouin light-scattering from polymer gels, incorporated with a new plausible assumption relating the speed of sound in the gel network with its volume fraction. It has been f...