Spectroscopic measurement of diffusion kinetics through subnanometer and larger Al2O3 particles by a new method: the interaction of 2-chloroethylethyl sulfide with gamma-Al2O3

Sunhee Kim; Oleg Byl; Jin-Chen Liu; J Karl Johnson; John T Yates Jr

doi:10.1021/jp057075f

Spectroscopic measurement of diffusion kinetics through subnanometer and larger Al2O3 particles by a new method: the interaction of 2-chloroethylethyl sulfide with gamma-Al2O3

J Phys Chem B. 2006 May 11;110(18):9204-10. doi: 10.1021/jp057075f.

Authors

Sunhee Kim¹, Oleg Byl, Jin-Chen Liu, J Karl Johnson, John T Yates Jr

Affiliation

¹ Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.

PMID: 16671735
DOI: 10.1021/jp057075f

Abstract

A new method to study the diffusion properties of molecules into porous materials using transmission IR spectroscopy is employed. A measurement of the diffusion of the 2-chloroethylethyl sulfide (2-CEES) molecule into two types of gamma-Al2O3 powder is performed, showing that the diffusion rate into subnanometer crystallite particle size gamma-Al2O3 powders (subnano-Al2O3) is higher than that into the larger crystallite particle size powder. It is shown that a surface diffusion mechanism can be used to model the diffusion process giving good agreement with the experimental results, where Dsubnano-Al2O3 is approximately 5 times larger than Dmultinano-Al2O3 at 170 K for the 2-CEES molecule.