Microporosity and connections between pores in SBA-15 mesostructured silicas as a function of the temperature of synthesis

Imaging of the platinum replica of the porous structure and low-pressure argon adsorption allowed us to elucidate the complicated porous structure of SBA-15. These techniques enabled us to draw a coherent picture of the evolution of the SBA-15 precursor mesophase as a function of the synthesis temperature. TEM of the platinum replicas has been unable to show bridges between the structural mesopores of SBA-15 synthesized at low temperature, whereas mesoporous bridges are clearly observed for samples formed at higher temperature. Argon adsorption has evidenced the ultramicroporosity of the materials formed at low temperature, as well as its evolution to secondary porosity with diameters greater than 1.5 nm under more severe hydrothermal treatment.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2003-01
Language
ENG
Keywords

MICELLE-TEMPLATED SILICA; MESOPOROUS SILICA; COPOLYMER; TRIBLOCK; STABILITY; NETWORKS; PLATINUM; MCM-41

Citation

NEW JOURNAL OF CHEMISTRY, v.27, no.1, pp.73 - 79

ISSN
1144-0546
DOI
10.1039/b207378c
URI
http://hdl.handle.net/10203/11139
Appears in Collection
CH-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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