Preparation and mechanism of magnetic carbonaceous polysaccharide microspheres by low-temperature hydrothermal method

In this study, the preparation method for magnetic carbonaceous polysaccharide (Fe3O4@CP) microspheres was developed to increase the yield and encapsulation efficiency using a suitable quantity of NaOH as the catalysis. The optimum fabrication condition was identified through a series of experiment, under which the resulting Fe3O4@CP microspheres show good magnetic properties. The saturation magnetization was 60.629 emu/g and the magnetite content increased up to 81.7%. The shell of the microspheres was carbonaceous polysaccharide with rich hydroxyl and carbonyl groups located on the surface, and the mean size was less than 300 nm. The formation mechanism of Fe3O4@CP was also discussed in this paper. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.