Abstract: Magnetic nanocrystals have been investigated extensively in the past several years for several potential applications, such as information technology, MRI contrast agents, and for drug conjugation and delivery. A specific property of interest in biomedicine is magnetic hyperthermia—an increase in temperature resulting from the thermal energy released by magnetic nanocrystals in an external alternating magnetic field. Iron oxide nanocrystals of various sizes and morphologies were synthesized and tested for specific losses (heating power) using frequencies of 111.1 kHz and 629.2 kHz, and corresponding magnetic field strengths of 9 and 25 mT. Polymorphous nanocrystals as well as spherical nanocrystals and nanowires in paramagnetic to ferromagnetic size range exhibited good heating power. A remarkable 30 °C temperature increase was observed in a nanowire sample at 111 kHz and magnetic field of 25 mT (19.6 kA/m), which is very close to the typical values of 100 kHz and 20 mT used in medical treatments.
This is an open access article distributed under the
Creative Commons Attribution License which permits unrestricted use, distribution,
and reproduction in any medium, provided the original work is properly cited.
Export to BibTeX
MDPI and ACS Style
Armijo, L.M.; Brandt, Y.I.; Mathew, D.; Yadav, S.; Maestas, S.; Rivera, A.C.; Cook, N.C.; Withers, N.J.; Smolyakov, G.A.; Adolphi, N.L.; Monson, T.C.; Huber, D.L.; Smyth, H.D.C.; Osiński, M. Iron Oxide Nanocrystals for Magnetic Hyperthermia Applications. Nanomaterials 2012, 2, 134-146.
Armijo LM, Brandt YI, Mathew D, Yadav S, Maestas S, Rivera AC, Cook NC, Withers NJ, Smolyakov GA, Adolphi NL, Monson TC, Huber DL, Smyth HDC, Osiński M. Iron Oxide Nanocrystals for Magnetic Hyperthermia Applications. Nanomaterials. 2012; 2(2):134-146.
Armijo, Leisha M.; Brandt, Yekaterina I.; Mathew, Dimple; Yadav, Surabhi; Maestas, Salomon; Rivera, Antonio C.; Cook, Nathaniel C.; Withers, Nathan J.; Smolyakov, Gennady A.; Adolphi, Natalie L.; Monson, Todd C.; Huber, Dale L.; Smyth, Hugh D. C.; Osiński, Marek. 2012. "Iron Oxide Nanocrystals for Magnetic Hyperthermia Applications." Nanomaterials 2, no. 2: 134-146.