Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28775
Title: Design and synthesis of novel magnetic core-shell polymeric particles
Authors: Ho, KM
Li, P 
Issue Date: 2008
Publisher: Amer Chemical Soc
Source: Langmuir, 2008, v. 24, no. 5, p. 1801-1807 How to cite?
Journal: Langmuir 
Abstract: A novel synthetic strategy was developed for the preparation of magnetic core-shell (MCS) particles consisting of hydrophobic poly(methyl methacrylate) cores with hydrophilic chitosan shells and γ-Fe2O3 nanoparticles inside the cores via copolymerization of methyl methacrylate from chitosan in the presence of vinyl-coated γ-Fe2O3 nanoparticles. The magnetic core-shell particles were characterized with transmission electron microscopy, field-emission scanning electron microscopy, particle size and -potential measurements, vibrating sample magnetometry, and atomic force microscopy, respectively. The MCS particles were less than 200 nm in diameter with a narrow size distribution (polydispersity = 1.09) and had a good colloidal stability (critical coagulation concentration = 1.2 M NaCl at pH 6.0). Magnetization study of the particles indicated that they exhibited superparamagnetism at room temperature and had a saturation magnetization of 2.7 A m2/kg. The MCS particles were able to form a continuous film on a glass substrate, where magnetic nanoparticles could evenly disperse throughout the film. Thus, these new materials should be extremely useful in various applications.
URI: http://hdl.handle.net/10397/28775
DOI: 10.1021/la702887m
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