Enhanced n-hexane diffusion in partially filled MCM-41 of different surface hydrophobicity probed by NMR

Autor:	Arne Karlsson, Eddy W. Hansen, Michael Stöcker, Stein Kolboe, F. Courivaud
Rok vydání:	2000
Předmět:	Surface diffusion chemistry.chemical_classification Surface (mathematics) Alkane Diffusion Analytical chemistry General Chemistry Condensed Matter Physics Thermal diffusivity Hexane chemistry.chemical_compound Hydrocarbon chemistry MCM-41 Mechanics of Materials General Materials Science
Zdroj:	Microporous and Mesoporous Materials. 37:223-232
ISSN:	1387-1811
DOI:	10.1016/s1387-1811(99)00268-1
Popis:	The effect of pore surface hydrophilic/hydrophobic character on n-hexane diffusion within MCM-41 particles was investigated by PFG NMR at different pore fillings. Starting with totally filled pores, the n-hexane diffusivity within MCM-41 particles is significantly enhanced as the pore filling is decreased until it reaches a maximum value. The diffusivity is shown to decline again at a very low pore filling. This is rationalized in terms of a a three-component parallel diffusion mechanism, in which a surface diffusion, an interface diffusion and a liquid phase diffusion are involved. The influence of surface property variations on the molecular diffusivity in MCM-41 is enhanced in partially filled samples.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::85ea7ab9b02a1e43c74da60218558d5a https://doi.org/10.1016/s1387-1811(99)00268-1 Zobrazit plný text záznamu Full Text from ScienceDirect