Diffusion in Hierarchical Pore Systems

1. Introduction With the advent of ordered mesoporous materials with hierarchically organized pore structures, many fundamental questions concerning the behaviour of confined fluids can now be addressed experimentally. Since they are promising materials for practical applications in catalysis, separation and adsorption, knowlegde of diffusion properties of such structures is of quintessential importance for their rational use. In this work, transport properties of fluids confined to a silica material with an ordered, bimodal pore structure are studied by means of pulsed field gradient nuclear magnetic resonance (PFG NMR).