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Issue 12, 2002
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Different neutral surfactant template extraction routes for synthetic hexagonal mesoporous silicas

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Abstract

The co-condensation of a tetraethoxysilane molecule on a neutral n-octylamine surfactant template is a convenient synthetic methodology for mesostructured material preparations. Distinct routes of template removal were investigated. The neutral surfactant was removed by calcination, hot solvent extraction, heating at 150 °C, in vacuo at room temperature and at 100 °C, and air drying, with the products assigned as HMM, HMS, HME, HMV1, HMV2 and HM, respectively. 29Si NMR, infrared, surface area, pore diameters and pore volume determinations were employed to characterize each sample. Elemental analysis detected the presence of amine residues of 1.8, 1.2, 0.2, 1.6 and 0.30 mmol g−1 for HMA, HME, HMS, HMV1 and HMV2, respectively. The HMM, HMS and HMV2 samples presented a low amount of amine residues, and HMS and HMV2 have the great advantage of permitting template removal without calcination.

Graphical abstract: Different neutral surfactant template extraction routes for synthetic hexagonal mesoporous silicas

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Publication details

The article was received on 29 Apr 2002, accepted on 09 Aug 2002 and first published on 17 Sep 2002


Article type: Paper
DOI: 10.1039/B204060C
Citation: J. Mater. Chem., 2002,12, 3823-3826
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    Different neutral surfactant template extraction routes for synthetic hexagonal mesoporous silicas

    A. G. S. Prado and C. Airoldi, J. Mater. Chem., 2002, 12, 3823
    DOI: 10.1039/B204060C

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