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Functional magnetic nanostructures for electromagnetic and biomedical applications

le 17 mars 2017
à 9h30

Hari Srikanth Professor of Physics Fellow –American Physical Society University of South Florida, Tampa FL, USA

Magnetic nanoparticles are being developed for applications ranging from high density recording, spintronic devices to nanomedicine. Surface functionalization and shape anisotropy of nanoparticles are key factors that govern the magnetic response. Dispersion of ferrite nanoparticles into a polymer matrix creates a new class of low-cost, lightweight nanocomposite materials with enhanced and tunable microwave properties for use in high-performance RF and microwave devices, such as integrated high-Q inductors and filters. A challenging issue in polymer nanocomposites is particle agglomeration into non-uniform clusters during the processing stages of thick films. Our research over the years has led to overcoming this limitation through surface functionalization. We have also fabricated high-aspect ratio magnetic nanotubes with excellent tunable microwave properties. Functional magnetic nanoparticles are currently being explored for several nanomedicine applications including contrast enhancement in MRI and magnetic hyperthermia treatment of cancer. There is a need to improve the specific absorption rate (SAR) and heating efficiency of nanoparticles for hyperthermia and our recent work has focused on the role of surface and interfacial anisotropy with a goal to enhance SAR. Strategies that go beyond simple spherical structures such as core-shell nanoparticle, exchange-coupled nanoparticles, nanowire, nanotube geometries can be exploited to increase saturation magnetization, effective anisotropy and heating efficiency in magnetic hyperthermia treatment of cancer cells. Overall I will discuss the role of advanced functional magnetic nanostructures in emerging electromagnetic and biomedical applications. Work supported by US Department of Energy, Army Research Office and Marie Curie Fellowship
Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Amphi CHEMLA - Bâtiment IDA

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