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Thermal Stability of Periodic Mesoporous SiCO Glasses
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Thermal Stability of Periodic Mesoporous SiCO Glasses
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Journal Article
Thermal Stability of Periodic Mesoporous SiCO Glasses
2005
Overview
Periodic Mesoporous Organosilicas (PMOs) with 2D-hexagonal and cubic Pm3n structures have been prepared from bis(trialkoxysilyl)ethane and cetyltrimethylammonium chloride. The two samples have been pyrolyzed under argon up to 1000 °C. Study by X-ray diffraction (synchrotron radiation) allows the thermal stability of both structures to be followed as a function of the pyrolysis temperature. While the 2D-hexagonal structure collapses after pyrolysis at 800 °C, the cubic Pm3n structure is retained up to 1000 °C. Further characterizations were performed by 29Si MAS-NMR, N2 adsorption-desorption experiments and elemental analysis. At 1000 °C, the first sample can be described as a mixture of silica and a free C phase, while the cubic one is a true SiCO glass with mixed SiCxO4 − x units (x = 0,1,2) and a very large surface area of 730 m2/g.
Publisher
Springer,Springer Nature B.V,Springer Verlag
