Relaxation processes in supercooled confined water and implications for protein dynamics

被引：173

作者：

Swenson, Jan ^{[1
]}

Jansson, Helen ^{[1
]}

Bergman, Rikard ^{[1
]}

机构：

[1] Chalmers Univ Technol, Dept Appl Phys, SE-41296 Gothenburg, Sweden

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.96.247802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the viscosity-related main (alpha) relaxation of confined water vanishes at a temperature where the volume required for the cooperative alpha relaxation becomes larger than the size of the geometrically confined water cluster. This occurs typically around 200 K, implying that above this temperature we observe a merged alpha-beta relaxation, whereas below it only a local (beta) relaxation remains. This also means that such confined supercooled water does not exhibit any true glass transition, in contrast to other liquids in similar confinements. Furthermore, it implies that deeply supercooled water in biological systems, such as membranes and proteins, generally shows only a local beta relaxation, a finding of importance for low temperature properties of biological materials.

引用

页数：4

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