Dynamic crossover phenomenon in confined supercooled water and its relation to the existence of a liquid-liquid critical point in water

Sow Hsin Chen, F. Mallamace, L. Liu, D. Z. Liu, X. Q. Chu, Y. Zhang, C. Kim, A. Faraone, C. Y. Mou, E. Fratini, P. Baglioni, A. I. Kolesnikov, V. Garcia-Sakai

研究成果: 書貢獻/報告類型會議貢獻

12 引文 斯高帕斯(Scopus)

摘要

We have observed a Fragile-to-Strong Dynamic Crossover (FSC) phenomenon of the α-relaxation time and self-diffusion constant in confined supercooled water. The α-relaxation time is measured by Quasielastic Neutron Scattering (QENS) experiments and the self-diffusion constant by Nuclear Magnetic Resonance (NMR) experiments. Water is confined in 1-d geometry in cylindrical pores of nanoscale silica materials, MCM-41-S and in Double-Wall Carbon Nanotubes (DWNT). The crossover phenomenon can also be observed from appearance of a Boson peak in Incoherent Inelastic Neutron Scattering experiments. We observe a pronounced violation of the Stokes-Einstein Relation at and below the crossover temperature at ambient pressure. Upon applying pressure to the confined water, the crossover temperature is shown to track closely the Widom line emanating from the existence of a liquid-liquid critical point in an unattainable deeply supercooled state of bulk water. Relation of the dynamic crossover phenomenon to the existence of a density minimum in supercooled confined water is discussed. Finally, we discuss a role of the FSC of the hydration water in a biopolymer that controls the biofunctionality of the biopolymer.

原文英語
主出版物標題Complex Systems - 5th International Workshop on Complex Systems
頁面39-52
頁數14
DOIs
出版狀態已發佈 - 2008
對外發佈
事件5th International Workshop on Complex Systems - Sendai, 日本
持續時間: 9月 25 20079月 28 2007

出版系列

名字AIP Conference Proceedings
982
ISSN(列印)0094-243X
ISSN(電子)1551-7616

會議

會議5th International Workshop on Complex Systems
國家/地區日本
城市Sendai
期間9/25/079/28/07

ASJC Scopus subject areas

  • 物理與天文學 (全部)

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