Magnetic materials, which have the potential for application in heating therapy by hyperthermia, were prepared. This alternative treatment is used to eliminate cancer cells. Magnetite, magnesium–calcium ferrites and manganese–calcium ferrites were synthesized by sol–gel method followed by heat treatment at different temperatures for 30 min in air. Materials with superparamagnetic behavior and nanometric sizes were obtained in all the cases. Thus, these nanopowders may be suitable for their use in human tissue. The average sizes were 14 nm for magnetite, 10 nm for both Mg0.4Ca0.6Fe2O4 and Mg0.6Ca0.4Fe2O4 and 11 nm for Mn0.2Ca0.8Fe2O4. Taking into account that the Mg0.4Ca0.6Fe2O4 and Mg0.6Ca0.4Fe2O4 treated at 350 °C showed the lower coercivity values, these nanoparticles were selected for heating tests and cell viability. Heating curves of Mg0.4Ca0.6Fe2O4 subjected to a magnetic field of 195 kHz and 10 kA/m exhibited a temperature increase up to 45 °C in 15 min. A high human osteosarcoma cell viability of 90–99.5 % was displayed. The human osteosarcoma cell with magnesium–calcium ferrites exposed to a magnetic field revealed a death cell higher than 80 % in all the cases.
|Original language||English (US)|
|Number of pages||8|
|Journal||Journal of Materials Science: Materials in Medicine|
|State||Published - Sep 20 2014|
ASJC Scopus subject areas
- Biomedical Engineering