Physical and Chemical Properties of Magnetite and Magnetite-Polymer Nanoparticles and Their Colloidal Dispersions

Hydrothermal synthesis of magnetite nanoparticlesviasequential formation of iron hydroxide precipitates

“…The ZFC and FC curves for the samples were separated even above room temperature, suggesting the presence of even stronger interactions between the adjacent Fe 3 O 4 grains [25]. The samples exhibited a ferromagnetic behaviour with a high saturation magnetisation, which was higher than that of -Fe 2 O 3 (56 emu/g), but a little bit lower than that of the corresponding bulk (92 emu/g) due to their smaller size [26]; this result was similar to those reported by Zaitsev et al [27] and Yu et al [28]. It was expected that the sample of Run No.…”

Synthesis and characterization of the core–shell magnetic molecularly imprinted polymers (Fe3O4@MIPs) adsorbents for effective extraction and determination of sulfonamides in the poultry feed

“…6) respectively. The theoretical value of saturation magnetization for bulk magnetite is reported to be 92 emu g −1 [48,49]. The decrease in magnetization value can be attributed to the small particle surface effect such as magnetically inactive layer containing spins that are not collinear with the magnetic field [50].…”

Modified chemical coprecipitation of magnetic magnetite nanoparticles using linear–dendritic copolymers

“…To overcome these limitations, several coprecipitation techniques were used such as interfacial coprecipitation (12), ultrasonic coprecipitation (11), microwave coprecipitation (22), mechanochemical coprecipitation (13), and coprecipitation with fast stirring (14). Furthermore, other research has utilized surfactants (23), macromolecules (24), or dilute acids (25) Linear-dendritic copolymers are hybrid macromolecules containing linear polymers and dendrimers (26,27). Poly (citric acid) (PCA)-poly (ethylene glycol) (PEG)-PCA copolymers containing hyperbranched dendritic citric acid parts (with a large number of OH functional groups in their structures) and linear PEG as flexible part (which enhances the solubility) could be effective as a template and stabilizer in water for the synthesis of NPs (28,29).…”