Synthesis and magnetic properties of monodisperse Fe3O4 nanoparticles

Parvin, K.; Ma, Jinzhu; Ly, Jimmy; Sun, Xiangcheng; Nikles, David E.; Sun, Kai; Wang, L. M.

doi:10.1063/1.1682783

Cited by 33 publications

(20 citation statements)

References 6 publications

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“…In all three cases, it can be noticed a decrease in Néel relaxation time with increasing volume fraction of nanoparticles. This behaviour is confirmed by the scientific literature, in theoretical as well as experimental works [34,35]. This happens because the local magnetic field increases and the energy barriers decrease with increasing concentration.…”

Section: Resultssupporting

confidence: 77%

The Néel Magnetic Relaxation Dynamics in Nanoparticle Systems - Phenomenological Approach versus Stochastic Approach

Osaci

2016

Acta Phys. Pol. A

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In nanomagnetism, the studies of magnetic nanoparticle systems are of particular interest from both experimental and theoretical points of view. Experimentally, the measurements made on such a system are hard to interpret. It is very difficult to distinguish the effect of the magnetic dipole interactions from the effects of size distribution or effective magnetic anisotropy constants. In this respect, the simulation models can help. This paper presents a study comparing the two conventional approaches, using simulation models for the magnetic relaxation dynamics of nanoparticle systems, i.e. a phenomenological Ising-type approach, on two levels, and a stochastic approach. The paper also shows a way of using these approaches in creating a model to simulate the Néel magnetic relaxation time for aligned magnetic nanoparticle systems.

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Section: Resultssupporting

confidence: 77%

The Néel Magnetic Relaxation Dynamics in Nanoparticle Systems - Phenomenological Approach versus Stochastic Approach

Osaci

2016

Acta Phys. Pol. A

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“…At ~1.6 mmol COOH/g CA addition the extrapolated value of Fe dissolution is ~30 mg Fe/g and the loss of Fe 3 O 4 is ~42 mg/g. For particle size calculation we used the value of magnetite density, ρ = 5.046 g/cm 3 [46]. Due to the effect of surface spin disorder [45,47], the size of the magnetic mass of MNPs is ~2 nm smaller than the physical particle size (a ~1 nm thick interfacial layer of the particles has an altered magnetic moment or cannot be magnetized at all); thus, the size of the effective magnetic core is ~5.2 nm.…”

Section: Resultsmentioning

confidence: 99%

Chemical and Colloidal Stability of Carboxylated Core-Shell Magnetite Nanoparticles Designed for Biomedical Applications

Szekeres

Tóth

Illés

et al. 2013

IJMS

104

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Despite the large efforts to prepare super paramagnetic iron oxide nanoparticles (MNPs) for biomedical applications, the number of FDA or EMA approved formulations is few. It is not known commonly that the approved formulations in many instances have already been withdrawn or discontinued by the producers; at present, hardly any approved formulations are produced and marketed. Literature survey reveals that there is a lack for a commonly accepted physicochemical practice in designing and qualifying formulations before they enter in vitro and in vivo biological testing. Such a standard procedure would exclude inadequate formulations from clinical trials thus improving their outcome. Here we present a straightforward route to assess eligibility of carboxylated MNPs for biomedical tests applied for a series of our core-shell products, i.e., citric acid, gallic acid, poly(acrylic acid) and poly(acrylic acid-co-maleic acid) coated MNPs. The discussion is based on physicochemical studies (carboxylate adsorption/desorption, FTIR-ATR, iron dissolution, zeta potential, particle size, coagulation kinetics and magnetization measurements) and involves in vitro and in vivo tests. Our procedure can serve as an example to construct adequate physico-chemical selection strategies for preparation of other types of core-shell nanoparticles as well.

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“…They behave superparamagnetically and can be modeled by a single Langevin function. 15 A second Langevin function is added to the mLM model for the antiferromagnetic particles to account for the magnetite/maghemite phase. This summation model ͚͑M͒ is expressed as…”

Section: Modelmentioning

confidence: 99%

Modeling the magnetic behavior of horse spleen ferritin with a two-phase core structure

Brem¹,

Stamm²,

Hirt³

2006

Journal of Applied Physics

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The growth of the nanotechnology industry has led to an increased interest in characterizing magnetic nanoparticles. A natural material with well-defined grain size in the nanoparticle range is commercially available—horse spleen ferritin, an iron storage protein. Modeling of the magnetic properties of commercial horse spleen ferritin is often based on the assumption of a single-phase core of ferrihydrite (5Fe2O3∙9H2O). Low temperature hysteresis measurements indicate, however, that the ferritin cores contain at least two magnetic phases. Initial magnetization curves measured at temperatures between 50 and 300K have been modeled using four methods. A model that used a sum of two Langevin functions fitted the data 70% better on average than a model that used a single Langevin function. It was also superior to both a random mean orientation model and a model that takes account of crystalline anisotropy. The two-phase model consists of a phase with a high coercivity that does not undergo saturation and a second phase with a low coercivity and a saturation field of 300mT. The high-coercivity phase is compatible with antiferromagnetic ferrihydrite, while the low-coercivity phase could be magnetite, maghemite, or a mixture of both. The results from this study are consistent with earlier microscopic studies that characterize horse spleen ferritin as a multiphase system with up to 30% of magnetite-maghemitelike cores.

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Synthesis and magnetic properties of monodisperse Fe3O4 nanoparticles

Cited by 33 publications

References 6 publications

The Néel Magnetic Relaxation Dynamics in Nanoparticle Systems - Phenomenological Approach versus Stochastic Approach

The Néel Magnetic Relaxation Dynamics in Nanoparticle Systems - Phenomenological Approach versus Stochastic Approach

Chemical and Colloidal Stability of Carboxylated Core-Shell Magnetite Nanoparticles Designed for Biomedical Applications

Modeling the magnetic behavior of horse spleen ferritin with a two-phase core structure

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