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

被引:232
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
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.
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页数:4
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