Ferrofluids of magnetic multicore nanoparticles for biomedical applications

Preparation of Core-Shell Hybrid Materials by Producing a Protein Corona Around Magnetic Nanoparticles

“…All prepared nanoparticle suspensions show a stability against sedimentation of several months as described in previous investigations [17,18].…”

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

“…Adding a solvent in which the polymer was insoluble yielded small secondary structures, while adding a solvent in which the polymer is soluble allowed for larger structures embedding a large number of primary nanocrystals to be formed. Different types of molecules, as encapsulating agents of iron oxide nanoparticles, have been used, including polymers/block copolymers ( Figure 6A, B) [24,99,98,101,94], micelles ( Figure 6C) [100], polysaccharides [22,32], or hydrogels [95]. For example, aggregated iron oxide particles with controlled size have been prepared by utilizing methods based on acid/base interactions involving pre-formed nanocrystals in an organic solvent ( Figure 6C) [100].…”

“…Colloidal nanoclusters have been found to be ferromagnetic/ferrimagnetic [21,32,36,80,81,83,89,98] or superparamagnetic [13-16, 22, 24, 31, 33, 35, 77, 79, 82, 84, 85] at ambient conditions. The ferrimagnatic/ferromagnetic behavior of nanoclusters may be attributed either to ferromagnetic incorporated nanoparticles of sufficient large diameter ( > 20 nm) [80,81] or to strong intra-cluster interactions [21].…”

“…Different morphologies, compact or loose structures with diameters ranging from 30 to a few hundred nm have been obtained with the previous synthesis strategies. Colloidal assemblies of inorganic nanocrystals are commonly called nanoclusters [15,[21][22][23][24][25][26][27][28][29], but in the literature, they can also be found as nanoflowers [30], nanoroses [17], multi-core particles [31,32], nanoassemblies [13,14,33,34], porous particles [35], flower-like mesocrystals [36], nanobeads [37,38], and pomegranate-like particles [34]. Furthermore, it is worth noting that these can be delivered with diverse chemical origin, including nanoclusters of ZnO [39,40], Co 3 O 4 [41], CuO [42], In 2 O 3 [40], CoO [40], MnO [40], ZnSe [40], CuCr 2 S 4 [43], PbS [44], and TiO 2 [45].…”

Adiabatic magnetothermia makes possible the study of the temperature dependence of the heat dissipated by magnetic nanoparticles under alternating magnetic fields

“…The SAR of ferromagnetic MNPs can be determined from minor magnetization loops. [4][5][6] This method cannot be, however, applied to superparamagnetic nanoparticles, which do not show hysteresis loops, but SAR can be obtained from the measurement of the out-of-phase ac magnetic susceptibility, Љ, by using the theoretical expressions that relate both magnitudes. 7 One drawback of the latter method is that, due the characteristics of the currently used setups, Љ is often measured with acfield parameters different than those used for MFH.…”