Superparamagnetism of Magnetite Nanoparticles : Dependence on Surface Modification

  • Mikhaylova M
  • Kim D
  • Bobrysheva N
 et al. 
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Abstract

See, stats, and : https : / / www . researchgate . net / publication / 7900926 Superparamagnetism Nanoparticles : Dependence Modification Article Impact : 4 . 46 : 10 . 1021 / la035648e : PubMed CITATIONS 282 READS 168 7 , including : Do Konyang 108 , 146 SEE T . Tsakalakos Rutgers , The 94 , 623 SEE Mamoun KTH 326 , 464 SEE Available : Do Retrieved : 15 Superparamagnetic iron oxide nanoparticles (SPION) with an average particle diameter of 6 nm are prepared by controlled chemical coprecipitations . Colloidal suspensions of noninteracting SPION , where the surface has been modified with three different types of biocompatible substances , namely , starch , gold (Au) , and methoxypoly (ethylene glycol) (MPEG) have been fabricated via three different techniques . Starch - coated SPION are prepared by coprecipitation in a polymeric matrix , Au - coated SPION are fabricated by the microemulsion method , and MPEG - coated SPION are prepared using the self - assembly approach . The magnetic nanoparticles form a core - shell structure , and the magnetic dipole - dipole interactions are screened by a layer of coating agents . The amounts of coating agents and SPION are indirectly calculated from the thermogravimetric analysis and superconducting quantum interference device measurements by assuming passive oxidation on the surface of the SPION , and the other conditions do not influence the measurements . The dependency of the spectral characteristics of Mössbauer spectroscopy as a function of an external magnetic field Hext is measured to investigate the effect of dipole - dipole screening of the different coating layers on the SPION . Uncoated SPION show a stable magnetic moment under Hext , and the superparamagnetic (SPM) fraction transforms to a ferrimagnetic state . Starch and Au - coated SPION retain the SPM fraction according to Mössbauer spectroscopy and magnetization measurements . MPEG - coated SPION show hyperfine magnetic structure without the quadrupole effect with increasing the value of the blocking temperature .

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Authors

  • Maria Mikhaylova

  • Do Kyung Kim

  • Natalia Bobrysheva

  • Mikhail Osmolowsky

  • Valentin Semenov

  • Thomas Tsakalakos

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