Accelerated dynamics of supercooled glycerol in soft confinement

被引：24

作者：

Blochowicz, T. ^{[1
]}

Gouirand, E. ^{[1
]}

Fricke, A. ^{[1
]}

Spehr, T. ^{[1
,2
]}

Stuehn, B. ^{[1
]}

Frick, B. ^{[2
]}

机构：

[1] Tech Univ Darmstadt, D-64289 Darmstadt, Germany

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

CHEMICAL PHYSICS LETTERS | 2009年 / 475卷 / 4-6期

关键词：

GLASS-TRANSITION; DEPENDENCE; SCATTERING; BEHAVIOR; LIQUID;

D O I：

10.1016/j.cplett.2009.05.058

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：

We investigate the dynamics of supercooled glycerol in a soft confinement within microemulsion droplets. The structure of the system is characterized by small-angle neutron scattering. We show that temperature-stable droplets establish a confinement, which may be varied in size from about 1 to 10 nm. Subsequently we focus on the dynamics of glass-forming glycerol confined within nanodroplets of different sizes. By combining neutron backscattering and time-of-flight for a broad dynamic range we obtain the incoherent intermediate scattering function S(q,t), which reveals increasingly accelerated dynamics as glycerol is confined to smaller droplets and for the relaxation times a crossover from Vogel-Fulcher behavior in the bulk to an Arrhenius law in confinement. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：171 / 174

页数：4

共 34 条

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