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Synthesis of Mesoporous Silica Monoliths with Embedded Nanoparticles

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Abstract:

Mesostructured silica–nanoparticle monolithic composites have been synthesized by dispersing prefabricated nanoparticles of gold or zeolite (silicalite) in ethanolic reaction mixtures containing SiCl4 and a Pluronic triblock copolymer template. Whereas silicalite nanoparticles were used directly, surface functionalization of the gold nanoparticles with either primed silicate ions or a discrete 3–5-nm-thick silica shell was required to increase the interfacial compatibility with the hydrophilic poly(ethylene oxide) blocks. Under these conditions, the resulting monoliths consisted of distributed nanoparticles within an ordered mesostructured silica matrix. Removal of the polymer template by calcination produced corresponding mesoporous silica-nanoparticle replicas. The combination of the structure and the porosity of the silica framework with the crystal chemical properties of the embedded nanoparticles suggests that such composites should be useful as multifunctional materials.

Keywords: MESOPOROUS SILICA; NANOCOMPOSITES; NANOPARTICLES

Document Type: Communications

DOI: https://doi.org/10.1166/jnn.2001.030

Affiliations: 1: School of Chemistry, University of Bristol, BS8 1TS, UK 2: Forschung und Anwendungstechnik Zeolithe, Degussa AG, Rodenbacher Chaussee 4 Postfach 1345, D-63403 Hanau, Germany

Publication date: 2001-06-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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