Distribution functions of magnetic moments and relaxation times for magnetic fluids exhibiting controllable microstructure evolution

Иванов, А. С.; Solovyova, Anna Yu.; Zverev, Vladimir S.; Elfimova, Ekaterina A.

doi:10.1016/j.molliq.2022.120550

Cited by 10 publications

(4 citation statements)

References 58 publications

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“…This non-monotonic behaviour was already observed for samples of MNPs by Aslani et al [ 43 ], Sappey et al [ 44 ] and Luo et al [ 45 ]. One possible interpretation of this behaviour can be the formation/decay of aggregates caused by the dipole–dipole interaction [ 10 , 11 ]. Zheng et al [ 46 ] have described it starting by considering nanoparticles with a large dimension distribution.…”

Section: Resultsmentioning

confidence: 99%

“…The properties of magnetic nanoparticles (MNPs) have been widely studied in the last years, and many different techniques are used today for their characterisation [ 1 ]. This is due to the large interest in this type of material in terms of its use for biomedical applications [ 2 , 3 ], including drug delivery [ 4 ] or hyperthermia cancer therapy [ 5 , 6 ], but also for applications such as data [ 7 ] energy storage [ 8 ] and for magnetic fluid preparation, which is a colloidal solution of magnetic nanoparticles coated with a stabiliser dispersed in a carrier liquid [ 9 , 10 , 11 ]. The possibility of MNPs showing a superparamagnetic state above the so-called “blocking temperature” (T B ) is the main reason for their versatility.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of a DC Magnetic Field on the AC Magnetic Properties of Oleic Acid-Coated Fe3O4 Nanoparticles

et al. 2023

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The AC magnetic properties of a sample of Fe3O4 nanoparticles coated with oleic acid have been investigated with the help of AC susceptibility measurements. In particular, several DC magnetic fields have been superimposed on the AC field, and their effect on the magnetic response of the sample has been analysed. The results show the presence of a double peak structure in the imaginary component of the complex AC susceptibility measured as a function of the temperature. A preliminary evaluation of the Mydosh parameter for both peaks gives the information that each one of them is associated with a different state of interaction between nanoparticles. The two peaks evolve both in amplitude and position when the intensity of the DC field is changed. The field dependence of the peak position shows two different trends, and it is possible to study them in the framework of the currently existing theoretical models. In particular, a model of non-interacting magnetic nanoparticles has been used to describe the behaviour of the peak at lower temperatures, whereas the behaviour of the peak at higher temperatures has been analysed in the framework of a spin-glass-like model. The proposed analysis technique can be useful for the characterisation of magnetic nanoparticles used in several types of applications, such as biomedical and magnetic fluids.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of a DC Magnetic Field on the AC Magnetic Properties of Oleic Acid-Coated Fe3O4 Nanoparticles

et al. 2023

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“…In order to account for the impact of magnetic dipole interactions, adjustments to the magnetic field are warranted. The first-order modified mean-field model (MMF1) [22] and the second-order modified mean-field model (MMF2) are commonly used [23]. The MMF1 and MMF2 models are expressed as follows: ( )…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Measurements based on magnetic properties are introduced for the inversion of the magnetic diameter distribution. Commonly used methods include maximum likelihood estimation [19], Bayesian method [20], nonlinear method [21], and regularization method [22], however, noise in the data causes oscillations during parameter estimation. The temperature exerts a significant influence on the volume of the magnetic core, resulting in alterations to the magnetic diameter at both high and low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Inversion of magnetic diameter distribution of magnetic fluids under high and low temperatures

Xue,

Yang,

Zhang

et al. 2024

Nanotechnology

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The magnetic diameter is a crucial factor affecting the magnetic properties of magnetic fluid. The magnetic diameter distribution can be estimated based on the magnetic properties. However, the magnetic dipole interaction of magnetic nanoparticles (MNPs) and the variation of the magnetic diameter with temperature have received relatively little attention in previous research. Hence, this research proposes the AP-MMF1-L method to inverse the magnetic diameter which considers the magnetic dipole interaction and derives the magnetic diameter at different temperatures. Firstly the AP-MMF1-L uses the least square method between the first-order modified mean-field Langevin function (MMF1-L) and the measured magnetization curve as the objective function. Meanwhile, the hybrid Artificial bee colony-Particle swarm (AP) optimization algorithm is introduced to inverse the optimal magnetic diameter distribution. Secondly, the hydrodynamic diameter distribution experimental values are compared with the theoretical values, demonstrating the AP-MMF1-L method obtains accurate inversion results of the magnetic diameter distribution when compared to other models. Finally, the arithmetic mean of the magnetic diameter at different temperatures is investigated, revealing a decreasing trend as the temperature rises, approximately following a linear distribution. The AP-MMF1-L provides a novel and effective tool for accurately determining the magnetic diameter of the MNPs across various temperatures.

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The study of magnetoviscous effect of the ferrofluids considering magnetic dipole interactions

Zhang,

Yang,

Shuang

et al. 2024

J Nanopart Res

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Distribution functions of magnetic moments and relaxation times for magnetic fluids exhibiting controllable microstructure evolution

Cited by 10 publications

References 58 publications

The Effect of a DC Magnetic Field on the AC Magnetic Properties of Oleic Acid-Coated Fe3O4 Nanoparticles

The Effect of a DC Magnetic Field on the AC Magnetic Properties of Oleic Acid-Coated Fe3O4 Nanoparticles

Inversion of magnetic diameter distribution of magnetic fluids under high and low temperatures

The study of magnetoviscous effect of the ferrofluids considering magnetic dipole interactions

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