Journal
LANGMUIR
Volume 25, Issue 2, Pages 939-943Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la802692z
Keywords
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Funding
- MEC [MAT2007-61734, RYC2137/06]
- Network of Excellence Insidepores [NMP3-CT2004-500895]
- Scientific research Flanders
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The porous structure of nanostructured silicas MCM-41 and SBA-15 has been characterized using N-2 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, N-2 adsorption experiments on the preadsorbed samples show that the microporosity on SBA-15 is located in intrawall positions, the micropore volume accounting for only similar to 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 <= 0.56 nm.
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