Preparation and investigation of magnetic properties of nano-sized garnets for application in magnetic hyperthermia.

Reference Presenter Authors
(Institution)
Abstract
08-105 Barbara Sartorelli Caldeira Caldeira, B.S.(São Paulo State University); Simões, A.Z.(São Paulo State University); Longo, E.(Federal University of São Carlos); Garcia, F.G.(Federal University of Itajubá); Hepatocarcinoma is a very common type of primary liver cancer. Despite recent advances in diagnosis and new treatment options, its prognosis has poor outcomes. Only 10–20% of hepatocellular carcinomas can be removed surgically. If cancer cannot be completely removed, the disease is usually deadly within 3 to 6 months. As an alternative to the traditional treatment methods, magnetohyperthermia is now gaining more attention than ever. Magnetohyperthermia may be described as a heat generation in the tumor region through the application of magnetic nanoparticles subjected to an alternating magnetic field. The proposal of this study was to obtain magnetic nanoparticles of pure Y3Fe3,35Al1,65O12 crystals (garnet structure) for magnetohyperthermia application. Parameters as composition, temperature and predefined preparation time were analyzed. The material was processed applying the microwave hydrothermal synthesis method at 140°C for 30 min and then at 700°C for 2h. By the use of field emission scanning electron microscopes (FE-SEM), X-ray diffraction (XRD) and hysteresis loop, it was verified a nanocrystalline spherical compound with superparamagnetic behavior. Finally, it was observed that crystallinity influences the magnetic properties and this will be studied in future works.
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