Abstract
We developed a novel synthesis method for a multifunctional nanocomposite with amine-functionalized Fe3O4 core coated with carboxylated nanochitosan shells (NH2-Fe3O4@NCS-COOH) via carbodiimide activation. The chemical structures of chitosan and carboxylated nanochitosan (NCS-COOH) were verified by 1H NMR which confirmed the incorporation of citric acid by the formation of the new signal of the CH2 H-atoms. TEM image displayed the synthesized NH2-Fe3O4@NCS-COOH nanoparticles were in a spherical shape with an average size of 100 nm. The results of XRD revealed that NH2-Fe3O4@NCS-COOH have a good crystalline nature with the face center cubic structure and with the average crystallite size of 17 nm. The characterization using VSM showed that the magnetic nanoparticle had superparamagnetic behavior and the saturation magnetization was up to 30 emu/g. The BET specific surface area of NH2-Fe3O4@NCS-COOH was 45.18 m2/g. The synthesized nanostructure was found to be stable in different ranges of pH due to covalent bonds between nanochitosan and Fe3O4.
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