Chemically Prepared Magnetic Nanoparticles

Willard, M. A.; Kurihara, Lynn K.; Carpenter, Everett E.; Calvin, S.; Harris, V. G.

doi:10.1002/chin.200447270

Cited by 45 publications

(62 citation statements)

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“…Chemical methods for producing the metal nanoparticles, in mainly based on the reduction reaction of salts and metal complexes [49][50][51]. The synthesis of nanoparticles of noble metals is presented in the reviews [52,53].…”

Section: Nanoparticlesmentioning

confidence: 99%

Substances Formed During Discharges

Коликов

Rutberg

2015

Pulsed Electrical Discharges for Medicine and Biology

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Up to date, there are two methods of producing the hydrated electrons: by means of radiolysis of water and water solutions by irradiation of γ-quanta, or electrons (Hart and Anbar, Hydrated electron 1973; Pikaev, Pulsed radiolysis of water and aqueous solutions 1965). Moreover, hydrated electrons are produced by means of the PED (Gorjachev et al, J Tech Phys Lett 11:16 1991). Since the plasma column of the PED in water has the temperature T = (10-20) × 10 3 K and pressure P = 10-10 3 MPa (Ushakov, Pulsed electrical discharge in gases 1975), it is reasonable to assume that the column is a powerful pulsed source of the UV-irradi- . Nanoclusters behave as quantum dots, i.e., inside them, as well as, in atoms, the free electrons can occupy only certain allowed energy states (Kreibig and Vollmer, Optical properties of metal clusters 1995). There are "magic" numbers of packing of atoms in nanoclusters: 13, 55, 147, 309, and 561 (Teo and Zhang, Magic numbers in clusters 2002). Thus, successes in the nanoparticles synthesis and study of their properties have stimulated explosion of applied researches of nanotechnologies and, first of all: nano-electronics, nano-optic-electronics, nano-electric-chemistry, analytical and biomedical applications of nanoparticles (Drexler, Nanosystems: molecular machinery, manufacturing and computation 1992; Siegel, Nanophase materials: synthesis, structure and properties 1994).

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Section: Nanoparticlesmentioning

confidence: 99%

Substances Formed During Discharges

Коликов

Rutberg

2015

Pulsed Electrical Discharges for Medicine and Biology

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“…Many physical phenomena in both organic and inorganic materials have natural length scales between 1 and 100 nm (10 2 to 10 7 atoms) [1,2]. A nanocomposite is a material composed of two or more phases with at least one phase with nanometer dimensions.…”

Section: Introductionmentioning

confidence: 99%

“…Liquid-phase synthesis is still one of the most commonly used methods to obtain inorganic nanoparticles [7]. Many studies have shown that surface modification, which provides additional functionality to nanoparticles, is easily accomplished after or during synthesis [1]. Recently, we proposed a new method to produce magnetic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Preparation of γ-Fe2O3/ZnFe2O4nanoparticles by enhancement of surface modification with NaOH

Chen

Lin

et al. 2014

Chemistry Central Journal

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BackgroundDuring liquid-phase synthesis of γ-Fe2O3 nanoparticles by chemically induced transition in FeCl2 solution, enhancement of surface modification by adding ZnCl2 was attempted by using NaOH. By using transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectrometry, and vibrating sample magnetometry, the dependence of the synthesis on the amount of additional NaOH was studied.ResultsThe experimental results show that the surface of the γ-Fe2O3 nanoparticles could be modified by adding ZnCl2 to form composite nanoparticles with γ-Fe2O3/ZnFe2O4 ferrite core coated with Zn(OH)2 and adsorbed FeCl3, and that modification could be enhanced by adding NaOH.ConclusionsIn the experimental conditions, when the concentration of additional NaOH was below 0.70 M, the amounts of ZnFe2O4 and Zn(OH)2 phases increased slightly and that of adsorbed FeCl3 was unchanged. When the concentration of NaOH exceeded 0.70 M, the amount of FeCl3, ZnFe2O4, and Zn(OH)2 increased.

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“…in magnetic storage media [1], catalysis [2] and medical applications [1,3]. We are particularly interested in the use of superparamagnetic magnetite nanoparticles in magnetic liquids and as functionalized materials for industrial scale transition and platinum group metal ion extraction [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%