Banca de DEFESA: CARLOS AUGUSTO DE MORAES IGLESIAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CARLOS AUGUSTO DE MORAES IGLESIAS
DATA : 09/03/2018
HORA: 14:00
LOCAL: Auditório do DFTE
TÍTULO:

Thermal behavior in the non-adiabatic regime of superparamagnetic nanoparticles in an alternating magnetic field

PALAVRAS-CHAVES:

Magnetic nanoparticles, magnetic hyperthermia, ferrofluid

PÁGINAS: 1
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
RESUMO:

The phenomena of raising the temperature of magnetic nanoparticles under an alternating magnetic field, known as magnetic hyperthermia, is an outstanding field, which gives rise to challenges in the context of fundamental physics and providing new roads to applications, such as in the cancer treatment and in the control of thermally activated drug delivery. Thus, the complete understanding of the behavior of these systems with reduced dimensions becomes a key point and the optimization of the production processes and the properties of these materials, a challenging task. In this work, we perform a theoretical and experimental investigation of the magnetic hyperthermia in MgO.Fe2O3 and FeO.Fe2O3 superparamagnetic nanoparticles. Specifically, we aim to fully understand the influence of the composition, nanoparticle size, as well as amplitude and frequency of the field on the specific absorption rate of the samples. Here, we propose a theoretical model to describe the thermal behavior of magnetic nanoparticles, providing further insights on well-known parameters found in literature. To test the robustness of the approach, we apply the theoretical model to describe the magnetic hyperthermia curves obtained experimentally. To obtain the magnetic hyperthermia curves, an experimental system is developed, making possible to generate magnetic fields with frequency up to 100 kHz and amplitude up to 200 Oe. The excellent agreement between theoretical and experimental results provides support to confirm the validity of our approach to describe the thermal behavior of magnetic nanoparticles.

MEMBROS DA BANCA:
Externo à Instituição - ANA LUCIA DANTAS - UERN
Presidente - 1508681 - FELIPE BOHN
Interno - 1457464 - LUIZ FELIPE CAVALCANTI PEREIRA
Interno - 1675199 - SUZANA NOBREGA DE MEDEIROS