Effect of ultrasonic treatment on dispersibility of Fe3O4 nanoparticles and synthesis of multi-core Fe3O4/SiO2 core/shell nanoparticles

Abstract

Ultrasonic treatment was employed to improve the dispersibility of the Fe 3 O 4 nanoparticles dispersed in aqueous solutions. Electrophoresis and XPS spectra indicate that the ultrasonic treatment can induce the generation of chemisorbed hydroxyl groups and the oxidation of Fe 2+ ions on the surface of the magnetic nanoparticles, thus resulting in improved dispersibility of the magnetic nanoparticles. After growth of silica protection layers on the Fe 3 O 4 nanoparticles with different times of ultrasonic treatment, Fe 3 O 4 /SiO 2 core/shell nanoparticles with different amounts of the magnetic cores were successfully prepared.

Targeted delivery of tissue plasminogen activator by binding to silica-coated magnetic nanoparticle

“…19 The second method is based on the Stöber process, in which silica is formed by the hydrolysis and condensation of TEOS in an ethanol-ammonia mixture. 20,21 The Stöber process is the prevailing choice for coating Fe 3 O 4 -MNP with silica, and has been proved to be an easy and efficient way to acquire silica-coated magnetic spheres. 19 Myocardial infarction and venous thromboembolism are the major causes of cardiovascular mortality, which results in over 1 million deaths each year in the US.…”

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

“…The Fe element increases when the samples are synthesized using ultrasonic irradiation compared with the co-precipitation method amounted to 90.35%, although impurities such as Ti (more than 5%) and other elements making up less than 1% still exist. Yang et al revealed that the use of ultrasound for the synthesis of Fe 3 O 4 is able to increase the amount of Fe 3+ ions from Fe 2+ that are oxidized [33]. According to the XRD spectra as shown in Figure (1), the ultrasonic irradiation does not change the structure of Fe 3 O 4 .…”

Sonochemical synthesis of Fe3O4/ZnO magnetic nanocomposites and their application in photo-catalytic degradation of various organic dyes

“…are produced on the particle surface and the as-formed Fe 3? chemisorb hydroxyl groups, which their concentration is increasing with ultrasonic time [26]. Recently, Küçük et al [27] showed that ultrasonic agitation decreased the size of PMAA-coated Fe 3 O 4 agglomerates significantly.…”