Diffusion in Circularly Ordered Mesoporous Silica Fibers

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.     «

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 t...     »

ISI Document Delivery No.: 754AU Times Cited: 0 Cited Reference Count: 34 Alsyouri, Hatem Gobin, Oliver C. Jentys, Andreas Lercher, Johannes A. Jentys, Andreas/D-4622-2009 Jentys, Andreas/0000-0001-5877-5042 Deutsche Forschungsgemeinschaft DFG [JE260-8/1]; EU The financial support from the Deutsche Forschungsgemeinschaft DFG under project JE260-8/1 is acknowledged. The authors are also grateful to Martin Neukamm for conducting the SEM measurements, to Xaver Hecht for the physisorption measurements, to R. Kolvenbach for the help in creating schematic representations of the fiber structure, and for the fruitful discussions in the framework of the center of excellence IDE-CAT. HA. acknowledges the DFG and the Support to Research and Technological Development and Innovation Initiatives and Strategies in Jordan-an EU-funded program, for funding his research visits to Germany. 0 Amer chemical soc Washington     «

ISI Document Delivery No.: 754AU Times Cited: 0 Cited Reference Count: 34 Alsyouri, Hatem Gobin, Oliver C. Jentys, Andreas Lercher, Johannes A. Jentys, Andreas/D-4622-2009 Jentys, Andreas/0000-0001-5877-5042 Deutsche Forschungsgemeinschaft DFG [JE260-8/1]; EU The financial support from the Deutsche Forschungsgemeinschaft DFG under project JE260-8/1 is acknowledged. The authors are also grateful to Martin Neukamm for conducting the SEM measurements, to Xaver Hecht for the physisorption measureme...     »