Diffusion in Circularly Ordered Mesoporous Silica Fibers

Hatem Alsyouri, Oliver C. Gobin, Andreas Jentys, Johannes A. Lercher

Journal Article: JOURNAL OF PHYSICAL CHEMISTRY C 115:8602-8612.

Abstract

Transport processes of n-hexane and mesitylene in circularly ordered mesoporous silica fibers have been investigated. Combining theoretical calculations based on the complex hierarchical structure with experimental results from frequency response experiments, three well-defined pathways for the transport pathways of molecules in the ordered mesoporous silica fibers are identified, that is, diffusion in axial, tangential, and radial directions, all occurring in parallel. The radial diffusion is the dominant process and is governed by intrawall transport. Transport in the axial direction overlaps with the radial diffusion and can be governed by either intrawall or mesopore transport. Cracks or defects at the surface enable diffusion in the tangential direction, which is the third kinetic process experimentally observed.

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