Supercooling of water confined in reverse micelles

被引：24

作者：

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

Frick, B. ^{[1
]}

Grillo, I. ^{[1
]}

Stuehn, B. ^{[2
]}

机构：

[1] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

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

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2008年 / 20卷 / 10期

关键词：

D O I：

10.1088/0953-8984/20/10/104204

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report on the temperature dependence of the nanosecond-timescale dynamics of the ternary mixture water/AOT/oil with deuterated heptane, toluene or decane as the oil. Water-swollen reverse micelles as formed in such microemulsions allow us to investigate the freezing behaviour of water confined in a soft environment. We report here on the first neutron scattering studies in which the freezing of the confined water and of the oil is followed down to temperatures at which the whole system is frozen. We focus on studies of water confined in three different droplet sizes: by means of small-angle neutron scattering we have determined the radii to be 46, 18, and 7 angstrom for water to surfactant ratios omega = 40, 12, and 3. From elastic temperature scans by neutron backscattering we deduce a strong supercooling of water confined in the reverse swollen micelles which increases with decreasing droplet size. For the smallest droplets we find a supercooling of more than 45 K compared to bulk water.

引用

页数：6

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