Water–ice phase transition probed by Raman spectroscopy

Abstract

International audienc

Raman spectra of proton order of thin ice Ih film

“…Figure shows the variation of the v + and v − wavenumbers of the coupled states with temperature. The v + wavenumber decreased up to 133 K, which agreed with the previous results . Remarkable resonant behavior was observed at temperatures below 133 K. At around 133 K, the v + wavenumber reached a minimum and then increased; whereas, the temperature‐insensitive v − wavenumber started to rapidly decrease.…”

Spectroscopic Characterization of Urea Aqueous Solutions: Experimental Phase Diagram of the Urea–Water Binary System

“…The solid phase thus corresponds to the eutectic mixture, the eutectic compound of urea being estimated to be CO(NH 2 ) 2 .8H 2 O. 29 Using the method developed by Durickovic et al 26 for water, and the one of Claverie et al 27 for NaCl aqueous solutions, the two urea phase transitions of the 134 kg/m 3 solution were determined. As described in the preliminary considerations, areas corresponding to characteristic parts of the liquid water spectrum, and to ice, were considered (Eq.…”

“…This region is therefore a main key for the phase transition determination of water and aqueous solutions. [25][26][27] The phase transition was then determined via the calculation of S D , an area ratio of a band relevant of the liquid water (light gray band on Fig. 3a) to the one of the ice (dark gray band on Fig.…”

In situ Raman monitoring of dielectric-heating-enhanced freeze-drying under different electromagnetic wave frequencies

“…Thus, it is a powerful tool for determining the water phase during food processing. [21][22][23][24][25] The OH-stretching band in the range 2900-3700 cm À1 is a good indicator of the water structure because it is sensitive to the hydrogen bond networks in water. Fig.…”