Spectroscopic measurement of diffusion kinetics through subnanometer and larger Al2O3 particles by a new method: the interaction of 2-chloroethylethyl sulfide with gamma-Al2O3.
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.
Kim
Sunhee
S
Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
Byl
Oleg
O
Liu
Jin-Chen
JC
Johnson
J Karl
JK
Yates
John T
JT