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Journal of Chemistry
Volume 2013, Article ID 585613, 8 pages
http://dx.doi.org/10.1155/2013/585613
Research Article

Preparation and Characterization of Magnetic Chitosan Microcapsules

1Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
2Fujian Provincial Key Laboratory of Fire Retardant Materials, Xiamen University, Xiamen 361005, China
3Fujian Provincial Key Laboratory of Polymer Materials, Fuzhou 350007, China
4Department of Biomedical Engineering, School of Basic Medical Science, Wuhan University, Wuhan 430071, China

Received 14 June 2012; Revised 23 August 2012; Accepted 26 August 2012

Academic Editor: Jean-Luc Blin

Copyright © 2013 Xiaopeng Xiong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

By dispersing aqueous precipitant in liquid paraffin to prepare a W/O emulsion then adding chitosan (CS) solution, CS microcapsules have been successfully prepared. It is a facile way to prepare polymer microcapsules by using aqueous precipitant or nonsolvent as template, which avoids the removal of template and would free from the necessity to cross-link the microcapsule as usual methods to directly form dense shell. The hollow feature of the obtained materials is revealed. The diameter of the microcapsules ranges from several μm to over 100 μm. Magnetic CS microcapsules have been prepared in this way when Fe3+ and Fe2+ were mixed with CS to prepare a mixture starting solution. The appearance and microstructure of the composite microcapsules were studied. The results indicate that the formed Fe3O4 nanoparticles are embedded in the CS matrix evenly due to strong interaction between the Fe3O4 nanoparticles and the CS molecules. The Fe3O4 content and the magnetic properties of the composite microcapsule were measured. The composite microcapsules were calcined in air at 700°C to prepare pure inorganic hollow microspheres. It is general to prepare hollow polymeric or composite particles by using this method.