Structural and magnetic study of zinc-doped magnetite nanoparticles and ferrofluids for hyperthermia applications
- Mendoza Zélis, Pedro
- Pasquevich, Gustavo Alberto
- Stewart, Silvana Jacqueline
- Fernandez Van Raap, Marcela Beatriz
- Aphesteguy, Juan Carlos
- Bruvera, Ignacio Javier
- Laborde, C.
- Pianciola, Betiana Noelia
- Jacobo, Silvia Elena
- Sánchez, Francisco Homero
DOIAbstract
Cubic-like shaped ZnxFe3−xO4 particles with crystallite mean sizes D between 15 and 117 nm were obtained by co-precipitation. Particle size effects and preferential occupation of spinel tetrahedral site by Zn2+ ions led to noticeable changes of physical properties. D ≥ 30 nm particles displayed nearly bulk properties, which were dominated by Zn concentration. For D ≤ 30 nm, dominant magnetic relaxation effects were observed by Mössbauer spectroscopy, with the mean blocking size DB ~ 13 to 15 nm. Saturation magnetization increased with x up to x ~ 0.1–0.3 and decreased for larger x. Power absorbed by water and chitosan-based ferrofluids from a 260 kHz radio frequency field was measured as a function of x, field amplitude H0 and ferrofluid co...
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