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Spherical and lamellar octadecylsilane hybrid silicas

Brambilla, Rodrigo, Pires, Gilvan P., da Silveira, Nadya P., dos Santos, Joao H.Z., Miranda, Marcia S.L., & Frost, Ray L. (2008) Spherical and lamellar octadecylsilane hybrid silicas. Journal of Non-Crystalline Solids, 354(45-46), pp. 5033-5040.

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Abstract

Silicas bearing different contents of octadecylsilane groups were synthesized by the sol-gel method and characterized by solid-state magic angle spin 13C Nuclear Magnetic Resonance spectroscopy, Raman spectroscopy, Attenuated total reflectance infrared spectroscopy, Small Angle X-Ray Scattering, Laser Light Scattering and Atomic Force Microscopy. A structural model for such hybrid materials is proposed in which spherical or lamellar morphology, fern-like or Porod’s structure, are proposed depending on the tetraethyl orthosilicate (TEOS)/octadecylsilane (ODS) molar ratio. The effect of the ODS addition time on the chain conformation and on the particle morphology and texture was also investigated. The degree of organization lowered as the amount of ODS increased. The nanostructured xerogel obtained in the case of pure TEOS evolutes from spherical to lamellar patterns, as the amount of octadecylsilane is increased.

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ID Code: 15512
Item Type: Journal Article
Keywords: hybrid silica, SAXS, ODS, AFM, sol, gel
DOI: 10.1016/j.jnoncrysol.2008.07.031
ISSN: 0022-3093
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Catalysis and Mechanisms of Reactions (030601)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2008 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 10 Nov 2008
Last Modified: 29 Feb 2012 23:46

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