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Mikhail V. Zyuzin

Early stage researcher* (ESR)/ Early Career Investigator (ECI)
PhD student
Period of mission: 03.11.16 - 13.11.16
Host institution: IMDEA Nanociencia, C/Faraday, 9, Campus Universitario de Cantoblanco, 28049 Madrid, Spain

Home institution:

Italian Institute of Technology, Via Morego, 30, 16163 Genoa, Italy

Iron oxide nanoparticles are often used as a heating source for hyperthermia applications. After applying alternating magnetic fields, two relaxation mechanisms take place in iron oxide nanoparticles (IONPs): Néel relaxation and Brownian relaxation. The heating ability of IONPs can be expressed by the specific absorption rate (SAR), which is maximized when both relaxation heatings contribute to a final heating. The value of SAR strongly depends on size of IONPs and medium, in which these nanoparticles are distributed. For example, “frozen” (with suppressed Brownian relaxation) IONPs heat less than free nanoparticles.

Polyelectrolyte (PE) capsules are widely used as carrier systems due to their low toxicity, low cost production, and robust synthesis. Cubic IONPs with different size (14, 18 nm) were loaded into the cavity of sub-micrometric polyelectrolyte capsules, so that they can freely move inside the capsule. Additionally, the same IONPs were embedded into a CaCO3 template and in the wall of polyelectrolyte capsule in order to “freeze” them and suppress the Brownian relaxation.  


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