Brownian rotational relaxation and power absorption in magnetite nanoparticles |
| |
Authors: | GF Goya R Fernandez-Pacheco M Arruebo N Cassinelli MR Ibarra |
| |
Institution: | 1. Institute of Nanoscience of Aragon (INA), University of Zaragoza, 50009 Zaragoza, Spain;2. Electronics Division, Bauer & Associates, Buenos Aires, Argentina;3. Facultad de Ingenieria, UNLP. Argentina |
| |
Abstract: | We present a study of the power absorption efficiency in several magnetite-based colloids, to asses their potential as magnetic inductive hyperthermia (MIH) agents. Relaxation times τ were measured through the imaginary susceptibility component χ″(T), and analyzed within Debye's theory of dipolar fluid. The results indicated Brownian rotational relaxation and allowed to calculate the hydrodynamic radius close to the values obtained from photon correlation. The study of the colloid performances as power absorbers showed no detectable increase of temperature for dextran-coated Fe3O4 nanoparticles, whereas a second Fe3O4-based dispersion of similar concentration could be heated up to 12 K after 30 min under similar experimental conditions. The different power absorption efficiencies are discussed in terms of the magnetic structure of the nanoparticles. |
| |
Keywords: | 75 50 Tt 75 30 Gw 81 20 Ev 75 75 +a" target="_blank">gif" overflow="scroll">+a |
本文献已被 ScienceDirect 等数据库收录! |
|