Creation of a functional polysiloxane layer on the surface of magnetic nanoparticles using the sol-gel method

• Published in: Glass physics and chemistry 2012-02, Vol.38 (1), p.96-104
• Main Authors: Mel’nik, I. V., Zub, Yu. L., Alonso, B., Abramov, N. V., Gorbik, P. P.
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemical Sciences; Chemistry and Materials Science; Composites; Glass; Magnetic properties; Material chemistry; Materials Science; Nanoparticles; Natural Materials; Nuclei; Physical Chemistry; Polysiloxanes; Preserves; Sol gel process; Surface layer
• ISSN: 1087-6596; 1608-313X
• DOI: 10.1134/S1087659611060113

The developed methods using tetraethoxysilane and trifunctional silanes were applied to obtain Fe 3 O 4 magnetic particles that contain amino groups with compositions of ≡Si(CH 2 ) 3 NH 2 , ≡Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , and [≡Si(CH 2 ) 3 ] 2 NH. The XRD data show that the nuclei of nanoparticles in the obtained materials preserve the structure of the primary carrier, namely, that of Fe 3 O 4 magnetite. The thermograms show a high thermal stability of the applied surface layers, i.e., their destruction was found to start at temperature above 250°C. The DRIFT spectra indicate the formation of the silica bond framework in the surface layers of nanoparticles and also the existence of hydrogen bonds between amino groups and silanol groups with the participation of water molecules aided. All of the obtained materials exhibit magnetic properties and offer promising application in medicine.