Mesoporous silica-magnetite nanocomposites: Fabrication, characterisation and applications in biosciences

Sen, Tapas and Bruce, Ian J. (2009) Mesoporous silica-magnetite nanocomposites: Fabrication, characterisation and applications in biosciences. Microporous and Mesoporous Materials, 120 (3). pp. 246-251. ISSN 1387-1811. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1016/j.micromeso.2008.11.012

Abstract

Template assisted fabrication of magnetic mesoporous silica-magnetite nanocomposites and their performance in binding and elution of Salmon sperm DNA has been reported. The effect of reaction pH (10-2) during the fabrication of nanocomposites has been studied. All materials fabricated at various pH were characterised by XRD, TEM, MIR, nitrogen adsorption and magnetic susceptibility measurements. Fabrication at neutral pH (7) in the presence of a cationic surfactant (cetyl trimethyl ammonium bromide; CTAB) produced core-shell nanocomposites of quasi spherical and rod shaped morphologies with mesoporous (pore size similar to 3.5 nm) silica shell and rhombic magnetite core. Fabrication at alkaline pH (10) produced monolithic mesoporous silica composites with embedded magnetite nanoparticles. Fabrication at acidic pH (4 and 2) produced a biphasic mixture of rhombic magnetite and amorphous silica rods. A similar fabrication at acidic pH (2) in the absence of CTAB produced a biphasic mixture of rhombic magnetite and spherical silica nanoparticles. All materials exhibited a high value of Salmon sperm DNA binding at physiological pH whereas elution value of DNA was observed to be dependent on the extent of silica coating on magnetite nanoparticles.

Item Type: Article
Uncontrolled keywords: Core-shell nanocomposites; Mesoporous silica-magnetite; Magnetic bioseparation
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: Suzanne Duffy
Date Deposited: 11 Sep 2009 13:30
Last Modified: 15 May 2014 08:18
Resource URI: http://kar.kent.ac.uk/id/eprint/22812 (The current URI for this page, for reference purposes)
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