Ferrofluids with high dynamic ranges of optical transmission

Sanz-Felipe, Ángel; Martín, José Carlos

doi:10.1117/12.2271794

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…as well as on the measurement conditions (magnetic field intensity and relative orientation, light wavelength). This complexity causes a wide diversity of experimental results reported in the literature, which may present even opposite trends under the same magnetic field orientation: an increase [7][8][9] or a decrease [7,8,10] of the optical transmission after magnetic field application. This variety is even observed with the same sample depending on the magnetostatic field intensity [1,2] or the light wavelength [11].…”

Section: Introductionmentioning

confidence: 99%

Numerical calculation of ferrofluid optical transmission evolution after magnetic field switch-on

Sanz-Felipe

Martín

2021

J. Phys. D: Appl. Phys.

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A method to calculate the optical transmission evolution of a ferrofluid after exposure to an external magnetic field is proposed. In the first part of this work, a simulation program is employed to simulate the nanoparticle rearrangement for different particle concentrations and different magnetic field intensities. In the second part, the simulated particle distributions' optical response is determined by means of a mixture law, which avoids typical huge computational times associated to this stage of the calculation. Experimental and simulated results with both parallel and perpendicular magnetic field orientations with respect to the incident light are compared. A significant correlation is obtained, which proves the usefulness of the proposed method in order to obtain the optical transmission evolution of a ferrofluid.

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Section: Introductionmentioning

confidence: 99%

Numerical calculation of ferrofluid optical transmission evolution after magnetic field switch-on

Sanz-Felipe

Martín

2021

J. Phys. D: Appl. Phys.

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“…A wide variety of magneto-optical responses are reported in the literature. Ferrofluid optical transmission may decrease [11][12][13] or increase [11,13,14] under the same magnetic field orientation with regard to the light beam, or even in the same sample, depending on the magnetic field intensity [1,2]. The high number of parameters involved in these substances (nanoparticle size, magnetization and concentration, surfactant coating, viscosity of the carrier fluid) and also in measurement conditions (light beam wavelength and magnetic field) makes the analysis of these interconnected dependences extremely challenging.…”

Section: Introductionmentioning

confidence: 99%

Application of a paramagnetic gas theory to describe the magneto-optical response in ferrofluids

Sanz-Felipe¹,

Martín²

2020

J. Phys. D: Appl. Phys.

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The magneto-optical response in ferrofluids depends significantly on the orientation and intensity of an applied magnetic field. However, such essential dependence is far from being properly described by a model based on fundamental laws. In this work, the model proposed by Elmore as an extension of the Langevin theory of a paramagnetic gas is checked. Considering the ferrofluid as an ideal paramagnetic gas is not realistic, so some modifications to the model are proposed. The modified Elmore’s model adequately fits the experimental results obtained at different magnetic field intensities and orientations for the two different wavelengths used. Transmission relaxation evolution after magnetic field switch-off is also provided by the model. In addition, the results for magnetic fields parallel to the light beam are in good agreement.

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Kerosene- and Water-Based Magnetic Fluids Stability Studied by Spectral Analysis

Alekseev

Nepomnyashchaya

Velichko

et al. 2022

Springer Proceedings in Physics

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Ferrofluids with high dynamic ranges of optical transmission

Cited by 3 publications

References 11 publications

Numerical calculation of ferrofluid optical transmission evolution after magnetic field switch-on

Numerical calculation of ferrofluid optical transmission evolution after magnetic field switch-on

Application of a paramagnetic gas theory to describe the magneto-optical response in ferrofluids

Kerosene- and Water-Based Magnetic Fluids Stability Studied by Spectral Analysis

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