摘要 :
Sodium polyacrylate modified Fe_3O_4 magnetic microspheres (SPMFMs) formed by self-assembly of nanocrystals were synthesized by a solvothermal method in mixed solvents of ethylene glycol and water. The SPMFMs exhibited a quasi-sup...
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Sodium polyacrylate modified Fe_3O_4 magnetic microspheres (SPMFMs) formed by self-assembly of nanocrystals were synthesized by a solvothermal method in mixed solvents of ethylene glycol and water. The SPMFMs exhibited a quasi-superparamagnetic behavior, and the saturation magnetization reached as high as 81.6 emu/g. The potential applications of the SPMFMs in the magnetic resonance imaging (MRI), drug delivery and waste water treatment were investigated. The loading capacity of the SPMFMs for bovine hemoglobin was 95 mg/g, and 33% of the loaded bovine hemoglobin was released in a period of 75 h. The adsorption for methylene blue and fuchsin basic using the SPMFMs as the adsorbent in the waste water treatment was efficient and rapid (within 1 min). The SPMFMs after the adsorption of the organic pollutants could be recycled and reused effectively with a slightly reduced adsorption capacity.
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摘要 :
Nanocomposites with magnetic iron oxide as the hollow core, silica as the middle shell and calcium silicate as the outer shell are the ideal agent for application in medical diagnosis and therapy. In this paper, by sol-gel coating...
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Nanocomposites with magnetic iron oxide as the hollow core, silica as the middle shell and calcium silicate as the outer shell are the ideal agent for application in medical diagnosis and therapy. In this paper, by sol-gel coating the self-assembled nanoparticles of magnetic iron oxide with silica, then reacting with Ca(NO_3)_2 · 4H_2O at 600℃ in inert N_2 atmosphere, the nanocomposite consisting of hollow-core-double-shell magnetic iron oxide/silica/calcium silicate has been successfully synthesized. The components of the hollow core, middle layer and outer layer are Fe_3O_4, SiO_2, CaSiO_4, respectively. The nanocomposite has a superparamagnetic behavior and good drug delivery performance, which are promising for the application in targeted drug delivery.
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