Self-diffusion of tris-naphthylbenzene near the glass transition temperature -: art. no. 015901

被引：233

作者：

Swallen, SF ^{[1
]}

Bonvallet, PA ^{[1
]}

McMahon, RJ ^{[1
]}

Ediger, MD ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.90.015901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a direct measurement of self-diffusion of a single-component glass-forming liquid at the glass transition temperature. Forward recoil spectrometry is used to measure the concentration profiles of deuterio and protio 1,3-bis-(1-naphthyl)-5-(2-naphthyl)benzene (TNB) following annealing-induced diffusion in a vapor-deposited bilayer. These experiments extend the range of measured diffusion coefficients in TNB by 6 orders of magnitude. The results indicate a decoupling of translational diffusion coefficients from viscosity or rotation. At T-g, D-T is 400 times larger than expected from the Stokes-Einstein equation.

引用

页数：4

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