Heterogeneity length scale for oxygen diffusion in glassy squalane |
| |
Authors: | VM Syutkin VV Korolev |
| |
Institution: | Institute of Chemical Kinetics and Combustion, Novosibirsk, 630090, Russian Federation |
| |
Abstract: | The kinetics of phenanthrene phosphorescence quenching by mobile oxygen molecules was used to study characteristics of oxygen diffusion on a nanometer length scale in glassy squalane. The phosphorescence decay was described using a model of glassy matrix with spatially correlated oxygen jump rates. The correlation length was determined to be 2.5 nm. The dispersion of barrier energy for oxygen jumps is 1.8 kJ/mol and the average barrier energy is 32 kJ/mol. The structural heterogeneities are deduced to be fluctuations in structure frozen in from the supercooled liquid. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|