Publication
Title
Is there any microporosity in ordered mesoporous silicas?
Author
Abstract
The porous structure of nanostructured silicas MCM-41 and SBA-15 has been characterized using N2 adsorption at 77 K, before and after n-nonane preadsorption, together with immersion calorimetry into liquids of different molecular dimensions. Selective blocking of the microporosity with n-nonane proves experimentally that MCM-41 is exclusively mesoporous while SBA-15 exhibits both micro- and mesopores. Additionally, N2 adsorption experiments on the preadsorbed samples show that the microporosity on SBA-15 is located in intrawall positions, the micropore volume accounting for only 7−8 % of the total pore volume. Calorimetric measurements into n-hexane (0.43 nm), 2-methylpentane (0.49 nm), and 2,2-dimethylbutane (0.56 nm) estimate the size of these micropores to be ¡Ü0.56 nm.
Language
English
Source (journal)
Langmuir: the ACS journal of surfaces and colloids. - Washington, D.C.
Publication
Washington, D.C. : 2009
ISSN
0743-7463
Volume/pages
25:2(2009), p. 939-943
ISI
000262431100042
Full text (Publishers DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 14.04.2009
Last edited 30.03.2017
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