Title: Influence of size and surface on magnetism of magnetite and maghemite nanoparticles

Authors: V.N. Nikiforov; E.A. Goodilin; A.V. Ivanov; A.N. Ignatenko; V.Yu. Irkhin

Addresses: M.V. Lomonosov Moscow State University, Moscow, 119991, Russia ' M.V. Lomonosov Moscow State University, Moscow, 119991, Russia ' N.N. Blokhin Russian Cancer Research Center, Russian Ministry of Health, Moscow, 115478, Russia ' Institute of Metal Physics, Russian Academy of Sciences, Ekaterinburg, 620990, Russia ' Institute of Metal Physics, Russian Academy of Sciences, Ekaterinburg, 620990, Russia

Abstract: The study of the influence of the size of magnetite and maghemite clusters on the magnetic properties (magnetic moment and the Curie temperature, the blocking temperature, etc.) is performed. For separating by size, the magnetic separation and centrifugation of the aqueous solution of iron oxide nanoparticles were applied. Native particles and the particles covered with a bioresorbable layer were examined. The controlled change in the nanoparticles' size leads to a change in their Curie temperature and magnetic moment. The theoretical calculations of the magnetic properties were made by using the Monte Carlo method for the classical Heisenberg model with different bulk and surface magnetic moments.

Keywords: nanotechnology; magnetite nanoparticles; maghemite nanoparticles; magnetic properties; particle size; particle surface; magnetic moment; Curie temperature; blocking temperature; iron oxide nanoparticles; bioresorbable layers; hyperthermia; cancer therapy.

DOI: 10.1504/IJNT.2017.083440

International Journal of Nanotechnology, 2017 Vol.14 No.7/8, pp.654 - 664

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 30 Mar 2017 *

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