RT journal article
T1 Unravelling viscosity effects to tailor the dynamical magnetic response of magnetic nanocubes
A1 Cabrera, David
A1 Lak, Aidin
A1 Yoshida, T.
A1 Materia, Maria Elena
A1 Ortega Ponce, Daniel
A1 Ludwig, Franz
A1 Guardia, Pablo
A1 Sathya, T.
A1 Pellegrino, Teresa
A1 Teran, Francisco J.
A2 Física de la Materia Condensada
K1 viscosity
K1 Iron oxide nanoparticles
K1 magnetic hyperthermia
AB Hysteresis losses in magnetic nanoparticles constitute the basis of magnetic hyperthermia for delivering a local thermal stress. Nevertheless, this therapeutic modality is only to be realised through a careful appraisal of the best possible intrinsic and extrinsic conditions to the nanoparticles for which they maximise and preserve their heating capabilities. Low frequency (100 kHz) hysteresis loops accurately probe the dynamical magnetic response of magnetic nanoparticles in a more reliable manner than calorimetry measurements, providing conclusive quantitative data under different experimental conditions. We consider here a set of iron oxide or cobalt ferrite nanocubes of different sizes, through which we experimentally and theoretically study the influence of the viscosity of the medium on the low frequency hysteresis loops of magnetic colloids, and hence their ability to produce and dissipate heat to the surroundings. We analyse the role of nanoparticle size, size distribution, chemical composition, and field intensity in making the magnetisation dynamics sensitive to viscosity. Numerical simulations using the stochastic Landau–Lifshitz–Gilbert equation model the experimental observations in excellent agreement. These results represent an important contribution towards predicting viscosity effects and hence to maximise heat dissipation from magnetic nanoparticles regardless of the environment.
YR 2017
FD 2017-03-21
LK http://hdl.handle.net/10498/35263
UL http://hdl.handle.net/10498/35263
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-may-2026