Synthesis protocol influence on aqueous magnetic fluid properties

Polyacrylic acid-coated iron oxide magnetic nanoparticles: The polymer molecular weight influence

“…NPs of non-toxical reagents at lower temperatures than other methods, such as thermal decomposition preparation process. However, a broad NPs size distribution and poor repeatability was reported for this method [8].…”

Stability and Relaxation Mechanisms of Citric Acid Coated Magnetite Nanoparticles for Magnetic Hyperthermia

“…Steric stabilization includes coating with non-ionic surfactant molecules, polymers, and inorganic layers as silica or some noble metals 11 . Among the routes employed for obtaining the water soluble functionalized iron oxide MNPs, the addition of small biocompatible organic molecules, such as aminoacids 12 , peptides 13 , citric acid 14,15,16 , and cyclodextrin 17 presents the advantages of combining electrostatic and steric stabilization, assuring coating biocompatibility and providing functionality for biomolecule conjugation. Polymeric stabilization comparing with electrostatic one presents the advantage of reversibility from the aggregated state by dilution, but usually involves the binding of a large macromolecule resulting in a coated MNP with a large overall size which strongly modifies its hydrodynamic behavior.…”

H-Field Contribution to the Electromagnetic Energy Deposition in Tissues Similar to the Brain but Containing Ferrimagnetic Particles, During Use of Face-Held Radio Transceivers

“…Such dimensions are smaller than diameters of crystals discovered in the brain. Transmission electron microscopy micrographs indicate that the particles in these samples are spherical [22], which means that they are not of the type of biogenic magnetite [23][24][25], but similar to the geometry of anthropogenic magnetite. Characteristics These two magnetic liquid samples were exposed sequentially, in volumes of V s = 2 ml each, in front of the portable transceiver, at distance D = 10 cm, at the measured incident magnetic field strength H = 0.22 A/m in air.…”

“…We have therefore chosen two water-based magnetic fluid samples (denoted here by S1 and S2) containing magnetic nanoparticles coated by tetramethylammonium hydroxide (N(CH3)4OH) and obtained by a chemical precipitation method [22]. They contain a mixture of magnetite and maghemite particles, with an average diameter d approaching 10 nm (including the surfactant shell of the magnetite core).…”

“…They contain a mixture of magnetite and maghemite particles, with an average diameter d approaching 10 nm (including the surfactant shell of the magnetite core). The average size of the magnetic core diameter -d M , volume fraction of solid phase in suspension -Φ, fraction of pherrophase in suspension -Φ M , particles' concentrations -n, and fluid density -ρ F are specified in Table 1 [22].…”