The influence of colloidal parameters on the specific power absorption of PAA-coated magnetite nanoparticles
1 Applied Physics and Physical Chemistry Departments, University of Santiago de Compostela, Santiago de Compostela, 15782, Spain
2 R&D Department, Nanogap Subnmpowder SA, Milladoiro, Ames, A Coruña, 15985, Spain
3 Instituto de Nanociencia de Aragón and Condensed Matter Physics Department, University of Zaragoza, Zaragoza, 50018, Spain
Nanoscale Research Letters 2011, 6:383 doi:10.1186/1556-276X-6-383Published: 16 May 2011
The suitability of magnetic nanoparticles (MNPs) to act as heat nano-sources by application of an alternating magnetic field has recently been studied due to their promising applications in biomedicine. The understanding of the magnetic relaxation mechanism in biocompatible nanoparticle systems is crucial in order to optimize the magnetic properties and maximize the specific absorption rate (SAR). With this aim, the SAR of magnetic dispersions containing superparamagnetic magnetite nanoparticles bio-coated with polyacrylic acid of an average particle size of ≈10 nm has been evaluated separately by changing colloidal parameters such as the MNP concentration and the viscosity of the solvent. A remarkable decrease of the SAR values with increasing particle concentration and solvent viscosity was found. These behaviours have been discussed on the basis of the magnetic relaxation mechanisms involved.
PACS: 80; 87; 87.85jf