Ferrimagnetic nanocrystal assemblies as versatile magnetic particle hyperthermia mediators

Sakellari, Dimitra; Brintakis, Konstantinos; Κωστοπούλου, Αθανασία; Myrovali, Eirini; Simeonidis, K.; Lappas, Alexandros; Angelakeris, M.

doi:10.1016/j.msec.2015.08.023

Cited by 74 publications

(60 citation statements)

References 42 publications

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“…by a factor ∼10 only ( × < 5 • 10 9 A•m −1 •s −1 ), as proposed by Dutz and Hergt. 13 As reported in literature, [14][15][16] higher specific heating rates of multicore IONPs as compared to single core IONPs are ascribed to "spin glass" dynamics of the magnetic moments within a cluster, strongly correlated by the exchange interaction. This collective behaviour enhances the magnetic susceptibility, i.e.…”

Section: Introductionmentioning

confidence: 64%

Monocorevs.multicore magnetic iron oxide nanoparticles: uptake by glioblastoma cells and efficiency for magnetic hyperthermia

Hemery

Genevois

Couillaud

et al. 2017

Mol. Syst. Des. Eng.

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Section: Introductionmentioning

confidence: 64%

Monocorevs.multicore magnetic iron oxide nanoparticles: uptake by glioblastoma cells and efficiency for magnetic hyperthermia

Hemery

Genevois

Couillaud

et al. 2017

Mol. Syst. Des. Eng.

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“…Calculation of Néel and Brown relaxation times in the latter unveiled that the Néel relaxation is faster than the Brownian and shorter than the measurement time [145]. These calculations indicated that the Néel relaxation is the leading mechanism together with the hysteresis losses for hyperthermia heating [145,148]. The dissimilar variation of the SLP upon the applied magnetic field strength, namely, being proportional to H for the aminecapped clusters [30] and to H 2 for the PS-encapsulated nanoclusters [145] reveal that the interactions among nanocrystals are mainly present in the first case.…”

Section: Nanoclusters As Heat Mediators In Magnetic Particle Hyperthementioning

confidence: 92%

“…In view of such observations, there is increasing theoretical interest to find the optimum particle concentration (in terms of the magnetic material volume fraction) that can be of great value for the development of efficient magnetic hyperthermia applications [148]. Materials-design criteria can then be developed so that we can employ the dipolar interactions as an avenue that operates for the benefit of raised heating response with nanocluster systems.…”

Section: Nanoclusters As Heat Mediators In Magnetic Particle Hyperthementioning

confidence: 99%

Colloidal magnetic nanocrystal clusters: variable length-scale interaction mechanisms, synergetic functionalities and technological advantages

Κωστοπούλου

Lappas

2015

Nanotechnology Reviews

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Magnetic particles of optimized nanoscale dimensions can be utilized as building blocks to generate colloidal nanocrystal assemblies with controlled size, well-defined morphology, and tailored properties. Recent advances in the state-of-the-art surfactant-assisted approaches for the directed aggregation of inorganic nanocrystals into cluster-like entities are discussed, and the synthesis parameters that determine their geometrical arrangement are highlighted. This review pays attention to the enhanced physical properties of iron oxide nanoclusters, while it also points to their emerging collective magnetic response. The current progress in experiment and theory for evaluating the strength and the role of intra-and inter-cluster interactions is analyzed in view of the spatial arrangement of the component nanocrystals. Numerous approaches have been proposed for the critical role of dipole-dipole and exchange interactions in establishing the nature of the nanoclusters' cooperative magnetic behavior (be it ferromagnetic or spin-glass like). Finally, we point out why the purposeful engineering of the nanoclusters' magnetic characteristics, including their surface functionality, may facilitate their use in diverse technological sectors ranging from nanomedicine and photonics to catalysis.

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“…Of the many proposed uses of iron oxide nanoparticles the most promising examples are cancer treatment by magnetic hyperthermia567891011, magnetic resonance1213 and particle imaging1415, magnetic biosensing1617 as well as magnetic drug targeting111213. The required magnetic response of the nanoparticles is typically determined by the application, and is in turn intrinsically dependent on the structural properties of the particle system.…”

mentioning

confidence: 99%

Structural and magnetic properties of multi-core nanoparticles analysed using a generalised numerical inversion method

Bender

Bogart

Posth

et al. 2017

Sci Rep

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The structural and magnetic properties of magnetic multi-core particles were determined by numerical inversion of small angle scattering and isothermal magnetisation data. The investigated particles consist of iron oxide nanoparticle cores (9 nm) embedded in poly(styrene) spheres (160 nm). A thorough physical characterisation of the particles included transmission electron microscopy, X-ray diffraction and asymmetrical flow field-flow fractionation. Their structure was ultimately disclosed by an indirect Fourier transform of static light scattering, small angle X-ray scattering and small angle neutron scattering data of the colloidal dispersion. The extracted pair distance distribution functions clearly indicated that the cores were mostly accumulated in the outer surface layers of the poly(styrene) spheres. To investigate the magnetic properties, the isothermal magnetisation curves of the multi-core particles (immobilised and dispersed in water) were analysed. The study stands out by applying the same numerical approach to extract the apparent moment distributions of the particles as for the indirect Fourier transform. It could be shown that the main peak of the apparent moment distributions correlated to the expected intrinsic moment distribution of the cores. Additional peaks were observed which signaled deviations of the isothermal magnetisation behavior from the non-interacting case, indicating weak dipolar interactions.

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Ferrimagnetic nanocrystal assemblies as versatile magnetic particle hyperthermia mediators

Cited by 74 publications

References 42 publications

Monocorevs.multicore magnetic iron oxide nanoparticles: uptake by glioblastoma cells and efficiency for magnetic hyperthermia

Monocorevs.multicore magnetic iron oxide nanoparticles: uptake by glioblastoma cells and efficiency for magnetic hyperthermia

Colloidal magnetic nanocrystal clusters: variable length-scale interaction mechanisms, synergetic functionalities and technological advantages

Structural and magnetic properties of multi-core nanoparticles analysed using a generalised numerical inversion method

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