Second critical point of water in supercooled confined water in L,L-diphenylalanine micro/nanotubes

Autor:	Ferreira, P. M. G. L., Kogikoski Jr., S., Alves, W. A., Martinho, H.
Rok vydání:	2014
Předmět:	Condensed Matter - Soft Condensed Matter
Druh dokumentu:	Working Paper
DOI:	10.1039/C5CP01055A
Popis:	The temperature dependence (10-290 K) of the low-frequency (20-150 cm-1) Raman-active phonon modes of supercooled confined water in L,L-diphenylalanine micro/nanotubes was analysed. The isolated dynamics of a specific geometry of water cluster (pentamer) in supercooled confined regime was studied in detail. A particular mode concerning water-nanotube interaction was also probed. A fragile-to-strong transition at 204 K was observed and related to the crossing of the Widom line. The critical exponent analyses of the relaxation rate data based on mode-coupling theory indicated perfect agreement among experimental data and theory. Our results are consistent with the existence of a second critical point of water. Comment: 5 pages, 4 figures, submitted to Phys. Rev. Lett
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1406.6857 Zobrazit plný text záznamu View this record from Arxiv