J. Phys. IV France 10 (2000) Pr7-207-Pr7-210
Water dynamics in controlled pore silica glassesH.N. Bordallo1, K.W. Herwig2, W.D. Dozier3 and F. Drake4
1 Intense Pulsed Neutron Source, Bldg. 360, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
2 Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
3 Fannie Mae, 3900 Wisconsin Ave. NW, Washington, DC 20016, U.S.A.
4 Exxon Research & Engineering Co., Route 22 East, Annandale, NJ 08801, U.S.A.
Water in porous silica glass is a suitable system for investigating the effect of confinement on translational diffusion. These systems are important because of their relevance in catalytic and separation processes. Here quasi-elastic neutron scattering experiments at room temperature on water-filled controlled-pore glasses with radius of 15, 24 and 32Å, are presented and analyzed using the random-jump diffusion model. Both the average residence time and the mean jump distance increase with decreasing pore radius.
© EDP Sciences 2000