Temperature of maximum density of water in hydrophilic confinement measured by transient grating spectroscopy

Year: 2010

Authors: Taschin A., Cucini R., Bartolini P., Torre R.

Autors Affiliation: Univ Firenze, European Lab Nonlinear Spect LENS, I-50019 Florence, Italy; Sincrotrone Trieste, I-34149 Trieste, Italy; Univ Firenze, Dipartimento Fis, I-50019 Florence, Italy.

Abstract: We report heterodyne detected transient grating measurements on water confined in the hydrophilic porous glass Vycor7930 in the range of temperature from -15 to 90 degrees C. With this experiment we are able to obtain the temperature of the water maximum density by measuring the temperature when the water thermal expansion coefficient vanishes. We found, similarly to what is already reported in the literature in hydrophobic confinement, that the temperature of the maximum density shifts to lower temperatures. We obtain this maximum at -1 +/- 1 degrees C. No experimental evidence of a shift of the temperature of maximum density in hydrophilic systems has been previously reported.

Journal/Review: EUROPHYSICS LETTERS

Volume: 92 (2)      Pages from: 26005-1  to: 26005-6

KeyWords: Supercooled Water; Dynamic Crossover; Liquid Water; Glassy Water; Minimum; Relaxation; Transition; Films
DOI: 10.1209/0295-5075/92/26005

Citations: 16
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