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Preparation Of Ultrafine Silica- And PEG-coated Magnetite Particles

M. Butterworth, L. Illum, S. Davis
Published 2001 · Chemistry

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Abstract The effect of the molecular weight, reaction temperature and polymer concentration were investigated. The PEG coverage could be controlled by the selection of the polymer; the molecular coverage increased with decrease in polymer molecular weight. A method for synthesising PEG-coated magnetite particles for use in diagnostic imaging is described. Magnetite particles in aqueous conditions were reacted with Si(OR)2R′R′′ (trimethoxysilane-PEG, R=Me; R′=Ome; R′′=PEG). These PEG-coated magnetite particles showed greatly enhanced colloid stability properties with respect to the uncoated particles.
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