Magnetic Properties of Fe 3 O 4 Nanoparticles Synthesized by Coprecipitation Method

Linh, Pham Hoai; Manh, Do Hung; Phong, P.T.; Hong, Le Van; Phuc, N.X.

doi:10.1007/s10948-014-2561-9

Cited by 18 publications

(23 citation statements)

References 11 publications

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“…For clarity, the curves were shifted, and the ZFC curve for x = 1 was zoomed out (upper right picture) around its T B T B , and it overlaps with the ZFC curve above T B . The temperature at which the magnetization data in the ZFC and FC curves starts to bifurcate is defined as the transition [47] or magnetic irreversibility [48,49] temperature. Here, the transition and blocking temperatures in the ZFC and FC curves are similar, except for x = 1.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

Taufiq

Sunaryono

Putra

et al. 2015

J Supercond Nov Magn

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A series of Mn x Fe 3−x O 4 (0 ≤ x ≤ 1) nanoparticles was successfully synthesized via a simple coprecipitation method. The starting material was a natural magnetite purified from local iron sand. Crystallite nanoparticles were produced by drying without using a high calcination temperature. Rietveld analysis of the X-ray diffractometry (XRD) data for all samples demonstrated that the Mn ions partially substituted the Fe ions in the spinel cubic structure of the Fe 3 O 4 to form Mn x Fe 3−x O 4 phases. We applied two lognormal spherical and single mass fractal models to the analysis of the small-angle neutron scattering (SANS) data and revealed that the primary Mn x Fe 3−x O 4 particles ranged in size from 1.5 to 3.8 nm and formed three-dimensional Darminto

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Section: Resultsmentioning

confidence: 99%

Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

Taufiq

Sunaryono

Putra

et al. 2015

J Supercond Nov Magn

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“…The temperature at which such a maximum in the ZFC curve occurs is usually referred to as the blocking temperature, below which the magnetic moments are frozen in fixed directions or "blocked" [53,54]. The blocking of a superparamagnetic particle is related to its magnetic anisotropy energy E a [55].…”

Section: Resultsmentioning

confidence: 99%

Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix

Nikolić¹,

Panjan²,

Blake³

et al. 2015

Journal of the European Ceramic Society

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“…Magnetic Fe 3 O 4 nanoparticles were synthesized by a coprecipitation method according to the reported procedure [30,31] with a minor modification. Briefly, FeCl 3 ∙6H 2 O (2.4 g) and FeCl 2 ∙4H 2 O (0.9 g) were dissolved in deionized water (80 mL), and this solution was purged with nitrogen for 30 min to displace oxygen.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Characterization of Magnetic Molecularly Imprinted Polymer for the Enrichment of Ofloxacin Enantiomers in Fish Samples

et al. 2016

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Abstract:A new method for the isolation and enrichment of ofloxacin enantiomers from fish samples was developed using magnetic molecularly imprinted polymers (MMIPs). These polymers can be easily collected and rapidly separated using an external magnetic field, and also exhibit a high specific recognition for ofloxacin enantiomers. The preparation of amino-functionalized MMIPs was carried out via suspension polymerization and a ring-opening reaction using rac-ofloxacin as a template, ethylenediamine as an active group, glycidyl methacrylate and methyl methacrylate as functional monomers, divinylbenzene as a cross-linker, and Fe 3 O 4 nanoparticles as magnetic cores. The characteristics of the MMIPs were assessed using transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and vibrating sample magnetometer (VSM) measurements. Furthermore, the adsorption properties were determined using Langmuir and Freundlich isotherm models. The conditions for use of these MMIPs as magnetic solid-phase extraction (MSPE) sorbents, including pH, adsorption time, desorption time, and eluent, were investigated in detail. An extraction method using MMIPs coupled with high performance liquid chromatography (HPLC) was developed for the determination of ofloxacin enantiomers in fish samples. The limits of quantitation (LOQ) for the developed method were 0.059 and 0.067 µg¨mL´1 for levofloxacin and dextrofloxacin, respectively. The recovery of ofloxacin enantiomers ranged from 79.2%˘5.6% to 84.4%˘4.6% and ofloxacin enantiomers had good linear relationships within the concentration range of 0.25-5.0 µg¨mL´1 (R 2 > 0.999). The obtained results demonstrate that MSPE-HPLC is a promising approach for preconcentration, purification, and simultaneous separation of ofloxacin enantiomers in biomatrix samples.

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Magnetic Properties of Fe 3 O 4 Nanoparticles Synthesized by Coprecipitation Method

Cited by 18 publications

References 11 publications

Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix

Synthesis and Characterization of Magnetic Molecularly Imprinted Polymer for the Enrichment of Ofloxacin Enantiomers in Fish Samples

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