Thermal stability of periodic Mesoporous SiCO glasses

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 the...

Full description

Saved in:
Bibliographic Details
Published in:Journal of sol-gel science and technology 2005, Vol.33 (1), p.99-102
Main Authors: TOURY, Bérangère, BLUM, Raphaël, GOLETTO, Valérie, BABONNEAU, Florence
Format: Article
Language:English
Subjects:
Argon
Chemical Sciences
Chemistry
Collapse
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Ethane
Exact sciences and technology
General and physical chemistry
Material chemistry
NMR
Nuclear magnetic resonance
Porous materials
Pyrolysis
Silicon dioxide
Structural stability
Synchrotron radiation
Thermal stability
X-ray diffraction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-005-6707-x