Ultrasonic-assisted in situ synthesis and characterization of superparamagnetic Fe3O4 nanoparticles

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

“…As demonstrated in Figure 2, magnetic performance of the modified NPs is better than NPs without modification. Because the remanence (Mr) value of unmodified Fe 3 O 4 is about 1.25 emu/g; while, that of the modified Fe 3 O 4 NPs is less than 0.65 emu/g that this could be attributed to the fact that, the NPs with modification were so small that they might be considered to have a single magnetic domain (10). From the magnetization curve, we can also see that the saturation magnetization (Ms) of the NPs increase from 62.76 to 66.54 emu/g when the sizes of Fe 3 O 4 increase from 15-30 to 5-10 nm, which can be attributed to the increase of crystallinity of the modified NPs.…”

“…For future highly sensitive magnetic nanostructures and biological and pharmacological applications, Fe 3 O 4 NPs with controlled size, shape, and a narrow size distribution are needed. Recently, research on the synthesis and application of Fe 3 O 4 NPs in chemistry and pharmaceuticals has received particular attention (10). Several methods have been developed for the synthesis of magnetic Fe 3 O 4 NPs, including chemical coprecipitation (10)(11)(12)(13)(14), the hydrothermal process (15), the solvothermal method (16), the sol-gel technique (17,18), microemulsion (19,20), etc.…”

Preparation of Fe3O4 magnetic nanoparticles coated with gallic acid for drug delivery

“…Previous study has shown that when pH is ,11, the grain size is slightly decreased with increasing pH values; however, when pH is .11, the grain size stays almost unchanged. 30 A previous study suggested that the optimum pH to produce pure magnetic nanoparticles must be within the range of 9.7-10.6. pH values below 8.5 may cause side reactions, namely production of goethite maghamite. 31 MTT cytotoxicity assay MCF-7, 3T3, and HT29 cell lines were obtained from the American Tissue Culture Collection (Manassas, VA) and maintained in RPMI 1640 medium supplemented with 10% fetal bovine serum, L-glutamine 15 mmol/L, penicillin 100 U/mL, and streptomycin 100 µg/mL, and incubated at 37°C in humidified 5% CO 2 /95% air.…”

Synthesis of Magnetite (Fe 3 O 4 ) Nanoparticles from Iron sands by Co - precipitation - U ltrasonic Irradiation Methods

“…The amount of such magnetic coercivity (Hc), remanent magnetization (Mr), and saturation magnetization (Ms) becomes the basis for the analysis of magnetic properties of the Fe 3 O 4 sample, as shown in Table (2). [35,36]. This low saturation magnetization value of the samples is due to the many impurities in the iron sands.…”