Effects of inter- and intra-aggregate magnetic dipolar interactions on the magnetic heating efficiency of iron oxide nanoparticles

Ovejero, J. G.; Cabrera, D.; Carrey, J.; Valdivielso, T.; Salas, G.; Teran, F. J.

Abstract

Iron oxide nanoparticles have found an increasing number of biomedical applications as sensing or trapping platforms and therapeutic and/or diagnostic agents. Most of these applications are based on their magnetic properties, which may vary depending on the nanoparticle aggregation state and/or concentration. In this work, we assess the effect of the inter- and intra-aggregate magnetic dipolar interactions on the heat dissipation power and AC hysteresis loops upon increasing the nanoparticle concentration and the hydrodynamic aggregate size. We observe different effects produced by inter- (long distance) and intra-aggregate (short distance) interactions, resulting in magnetizing and demagnetizing effects, respectively. Consequently, the heat dissipation power under alternating magnetic fields strongly reflects such different interacting phenomena. The intra-aggregate interaction results were successfully modeled by numerical simulations. A better understanding of magnetic dipolar interactions is mandatory for achieving a reliable magnetic hyperthermia response when nanoparticles are located into biological matrices.

Citation

Ovejero, J. G., Cabrera, D., Carrey, J., Valdivielso, T., Salas, G., & Teran, F. J. (in press). Effects of inter- and intra-aggregate magnetic dipolar interactions on the magnetic heating efficiency of iron oxide nanoparticles. Physical Chemistry Chemical Physics, 18(16), 10954-10963. https://doi.org/10.1039/c6cp00468g

• Journal Article Type: Article
• Acceptance Date: Mar 16, 2016
• Online Publication Date: Mar 16, 2016
• Deposit Date: Jun 8, 2023
• Journal: Physical Chemistry Chemical Physics
• Print ISSN: 1463-9076
• Electronic ISSN: 1463-9084
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 18
• Issue: 16
• Pages: 10954-10963
• DOI: https://doi.org/10.1039/c6cp00468g
• Keywords: Physical and Theoretical Chemistry; General Physics and Astronomy
• Additional Information: : This document is Similarity Check deposited; : Supplementary Information; : J. Carrey (ResearcherID); : The PCCP Owner Societies have an exclusive publication licence for this journal; : Single-blind; : Received 21 January 2016; Accepted 16 March 2016; Accepted Manuscript published 16 March 2016; Advance Article published 4 April 2016; Version of Record published 20 April 2016