Hydrothermally stable periodic mesoporous ethane-silica and bimodal mesoporous nanostructures

Wahab, M. Abdul and He, Chaobin (2011) Hydrothermally stable periodic mesoporous ethane-silica and bimodal mesoporous nanostructures. Journal of Nanoscience and Nanotechnology, 11 10: 8481-8487. doi:10.1166/jnn.2011.4962

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Author Wahab, M. Abdul
He, Chaobin
Title Hydrothermally stable periodic mesoporous ethane-silica and bimodal mesoporous nanostructures
Journal name Journal of Nanoscience and Nanotechnology   Check publisher's open access policy
ISSN 1533-4880
Publication date 2011-10-01
Sub-type Article (original research)
DOI 10.1166/jnn.2011.4962
Volume 11
Issue 10
Start page 8481
End page 8487
Total pages 7
Place of publication Valencia, CA, United States
Publisher American Scientific Publishers
Language eng
Formatted abstract
We report the hydrothermally stable organized periodic mesoporous organosilicas (PMOs) and bimodal mesoporous structures by using mixed templates of oligomeric alkyl-ethylene oxide and ionic surfactants under basic conditions. Oligomeric alkyl-ethylene oxide surfactant [(Polyoxyethylene (2) cetyl ether, structure is C16H33(OCH2CH2)nOH, n ∼ 2, hereafter known as B52) and ionic surfactant (cethyltrimethylammonium bromide (CTAB)) templating systems form mixed micelles that self-assemble into well-ordered hexagonal and bimodal mesostructures. The X-ray diffraction (XRD), transmission electron microscopy (TEM), BET, NMR and hydrothermal study have been used to investigate the effects of B52 on the formation of various PMOs. It is found that surface structural properties of mesostructures largely depend on the concentration of the B52 in the surfactant solution. The addition of B52 in the surfactant solution is not only improves mesostructural ordering and also enables to produces mesostructures with tuned surface structural properties. The final PMO structure shows good hydrothermal stability and can withstand for 72 h in boiling water, due to the hydrophobic pore wall chemistry in ethane-bridged PMO framework (≡Si-CH2-CH2-Si≡) and relatively more condensed framework such T3 supported by NMR spectrum. So, the lacking affinity for water through the favorable hydrophobic framework chemistry enhances the hydrothermal stability.
Keyword Pmo
Sol-Gel Self-Assembly Process
Bimodal Mesostructures
Oligomeric Alkyl-Ethylene Oxide
Ionic Surfactant and Hydrothermal Stability
Surfactant Mixtures
Pore Walls
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
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