Relaxation dynamics of deeply supercooled confined water in L,L-diphenylalanine micro/nanotubes

被引：7

作者：

Ferreira, P. M. G. L. ^{[1
]}

Ishikawa, M. S. ^{[1
]}

Kogikoski, S., Jr. ^{[1
]}

Alves, W. A. ^{[1
]}

Martinho, H. ^{[1
]}

机构：

[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210580 Santo Andre, SP, Brazil

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2015年 / 17卷 / 48期

基金：

巴西圣保罗研究基金会;

关键词：

STRONG LIQUID TRANSITION; PROTEIN HYDRATION WATER; MODE-COUPLING THEORY; CROSSOVER; PRESSURE; SCATTERING; VISCOSITY; DENSITY; FLUID; PHASE;

D O I：

10.1039/c5cp01055a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The temperature dependence (10-290 K) of the low-frequency (20-150 cm(-1)) Raman-active phonon modes of deeply supercooled confined water in L,L-diphenylalanine micro/nanotubes was analyzed. The isolated dynamics of a specific geometry of a water cluster (pentamer) in a supercooled confined regime was studied in detail. A fragile-to-strong transition at 204 K was observed and related to the crossing of the Widom line. Analysis of peptide vibrational modes coupled to water hydrogen bonds indicated that hydrogen bond fluctuations play an irrelevant role in this system. Our results are in agreement with the second critical point of water existence hypothesis.

引用

页码：32126 / 32131

页数：6

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