Preparation of superparamagnetic magnetite nanoparticles by reverse precipitation method: Contribution of sonochemically generated oxidants

Mizukoshi, Yoshiteru; Shuto, Tatsuya; Masahashi, Naoya; Tanabe, Shuji

doi:10.1016/j.ultsonch.2008.12.017

Cited by 60 publications

(30 citation statements)

References 31 publications

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“…Although co-precipitation is very convenient for mass production, it requires molar ratio control of Fe 2+ and Fe 3+ and the careful adjustment for pH value of the solution, as well as deoxygenated condition. There are two methods of adding precursors in the process of co-precipitation to synthesize magnetite: (I) normal co-precipitation [19] and (II) reverse co-precipitation [18,20]. In the first case, alkali solution is added into the metal salt solution and the pH value of the reaction medium increases gradually.…”

Section: Introductionmentioning

confidence: 99%

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Effect of ferric ions on the morphology and size of magnetite nanocrystals synthesized by ultrasonic irradiation

Cheng

Chen

et al. 2011

Cryst. Res. Technol.

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Two-dimensional plate-like Fe 3 O 4 nanocrystals and nanoparticles could be synthesized by a simple one-step sonochemical method through ultrasonic irradiation in reverse co-precipitation solution at low temperature. This technique provided a facile and rapid way to prepare Fe 3 O 4 nanocrystals with different morphology and size. Magnetite nanoplates were synthesized with only ferrous salt adding into alkali solution, and adding ferric ions with low molar ratio in the metal salts solution would lead to the formation of very small magnetite nanoparticles (~10 nm). The size of as-prepared magnetite nanoparticles increased with increasing reaction temperature and showed narrow size distribution, the standard deviation less than 2 nm. This investigation indicated that ferric ions had significant influence on the morphology of Fe 3 O 4 nanocrystals.

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Section: Introductionmentioning

confidence: 99%

“…Ultrasonic irradiation in a solution during the chemical reaction may accelerate the rate of the reaction and enhance the crystallization [22,23]. Sonochemical technique has been proved to be an effective method to synthesize magnetic nanoparticles [20,[22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Effect of ferric ions on the morphology and size of magnetite nanocrystals synthesized by ultrasonic irradiation

Cheng

Chen

et al. 2011

Cryst. Res. Technol.

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“…Under these conditions, uniform layers of chitosan-based polymers can be assembled on IONPs to stabilize each discrete nanoparticle. The chitosan-coated IONPs prepared through this in situ method are monodispersed, and surface modified with a uniform coat of chitosan polymers [86].…”

Section: In Situ Coating Approachesmentioning

confidence: 99%

Chitosan-Coated Iron Oxide Nanoparticles for Molecular Imaging and Drug Delivery

Arami

Stephen

Veiseh

et al. 2011

Advances in Polymer Science

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Iron oxide nanoparticles (IONPs) are a new class of nanomaterials which have attracted extensive interest for application in in vivo magnetic resonance imaging (MRI) due to their intrinsic superparamagnetic and biodegradable properties. Performance of the IONPs is largely dependent upon the properties of their surface coatings, which serve to prevent nanoparticle agglomeration, reduce the risk of immunogenicity, and limit nonspecific cellular uptake. Among the coating materials studied to date, chitosan has drawn considerable attention. Commonly derived from crustacean shells, chitosan is a natural linear polysaccharide and has ample reactive functional groups that can serve as anchors for conjugation of therapeutics, targeting ligands, and imaging agents. Because of these unique attributes, chitosan-coated IONPs are becoming more desirable for cancer imaging and therapy applications. This chapter discusses the current advances and challenges in synthesis of chitosan-coated IONPs, and their subsequent surface modifications for applications in cancer diagnosis and therapy.

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“…The reason for the different structure of 140-CO is still not clear, but is believed to be related to the oxidation state of iron oxide. In other words, the transformation to Au□Fe precursor by precipitation [25,26]. Most of the Fe 3 O 4 particles formed through the precipitation method are on a micrometer scale because the particle growth after the nucleation of hydroxides cannot be controlled in the liquid phase synthesis.…”

Section: Characterizations Of the Catalyst After Pre-reductionmentioning

confidence: 99%

Pre-Reduction of Au/Iron Oxide Catalyst for Low-Temperature Water-Gas Shift Reaction Below 150 °C

et al. 2011

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Low-temperature water-gas shift reaction (WGS) using gold catalyst is expected to be an attractive technique to realize an efficient on-site hydrogen production process. In this paper, Au/Fe 3 O 4 catalysts for promoting the WGS below 150 °C were developed by a preliminary reduction of Au/iron oxide (Fe 3+ ) catalyst utilizing high reactivity of Au nano-particles. The reduction was conducted under a CO, H 2 , or CO/H 2 O stream at either 140 or 200 °C, and the effect of reduction conditions on the characteristics of the Au/Fe 3 O 4 catalyst and on the catalytic activity in WGS at 80 °C was investigated. The reaction progress during the pre-reduction treatment was qualitatively analyzed, and it was found that the iron oxide in Au/Fe 2 O 3 calcined at 200 °C was easily reduced to Fe 3 O 4 phase in all reduction conditions. The reduction conditions affected the characteristics of both Au and iron oxide, but all of the reduced catalysts had small Fe 3 O 4 particles of less than 20 nm with Au particles on the surface. The surface area and content of cationic Au were high in the order of CO, H 2 , CO/H 2 O, and 140, 200 °C. In the WGS test at 80 °C using the developed catalysts, the activities of the catalysts pre-reduced by CO at 140 or 200 °C and by H 2 at 140 °C were very high with 100% CO conversion even at such a low temperature. These results indicated that factors such as higher surface area, crystallized Fe 3 O 4 , and cationic Au content contributed to the catalytic activity. OPEN ACCESSCatalysts 2011, 1 176

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Preparation of superparamagnetic magnetite nanoparticles by reverse precipitation method: Contribution of sonochemically generated oxidants

Cited by 60 publications

References 31 publications

Effect of ferric ions on the morphology and size of magnetite nanocrystals synthesized by ultrasonic irradiation

Effect of ferric ions on the morphology and size of magnetite nanocrystals synthesized by ultrasonic irradiation

Chitosan-Coated Iron Oxide Nanoparticles for Molecular Imaging and Drug Delivery

Pre-Reduction of Au/Iron Oxide Catalyst for Low-Temperature Water-Gas Shift Reaction Below 150 °C

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