The Cotton-Mouton effect in ferrofluids containing rod-like magnetite particles

Badescu, V.; Udrea, L. E.; Rotariu, Ovidiu; Bădescu, Rodica; Apreotesei, Gabriela

doi:10.1088/1742-6596/149/1/012101

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…Some nanofiber suspensions have also been found to show lower off-field viscosity compared to nanosphere suspensions, which provides a possible way to solve the problem of large off-field viscosity of present nanoparticle based ER fluids. Especially, it should be noted that the theoretical and experimental investigations performed recently on MR fluids also showed that suspensions containing magnetic fibers or nanofibers gave rise to an enhanced magnetorheology when compared with conventional MR fluids made up of spherical particles [ 153 - 163 ]. Therefore, it is reasonable to point out that employing anisotropic nanostructured particles to improve ER performances is a very interesting topic.…”

Section: Discussionmentioning

confidence: 99%

Electrorheology of nanofiber suspensions

Yin

Zhao

2011

Nanoscale Res Lett

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Electrorheological (ER) fluid, which can be transformed rapidly from a fluid-like state to a solid-like state under an external electric field, is considered to be one of the most important smart fluids. However, conventional ER fluids based on microparticles are subjected to challenges in practical applications due to the lack of versatile performances. Recent researches of using nanoparticles as the dispersal phase have led to new interest in the development of non-conventional ER fluids with improved performances. In this review, we especially focus on the recent researches on electrorheology of various nanofiber-based suspensions, including inorganic, organic, and inorganic/organic composite nanofibers. Our goal is to highlight the advantages of using anisotropic nanostructured materials as dispersal phases to improve ER performances.

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Section: Discussionmentioning

confidence: 99%

Electrorheology of nanofiber suspensions

Yin

Zhao

2011

Nanoscale Res Lett

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“…The recent works were motivated by possibility to improve the dielectric and thermal properties of high performance insulating fluids and the knowledge transfer to modern power technologies. Regarding ultrasonics in MFs, one can find studies on external thermal and magnetic field influence on MF structure [4], the particle size distribution and aggregates in MF [5,6] and basic sonic characterization of MFs, too [7,8]. * corresponding author; e-mail: juraj.kurimsky@tuke.sk…”

Section: Introductionmentioning

confidence: 99%

Ultrasound Frequency Analysis of a Magnetic Fluid in Low-Intensity External Magnetic Field

et al. 2017

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This work deals with an interaction of a magnetic fluid of a dielectric nature with a magnetic field by means of ultrasound waves measurements and analysis. Ultrasound analysis is known as a non-destructive inspection tool often used in technical diagnostics, moreover, it has numerous applications in medicine and biology, too. We report the low-frequency ultrasound analysis of a dielectric magnetic fluid in a low-intensity external static magnetic field. The studied magnetic fluid was composed of a transformer oil and dispersed magnetite nanoparticles coated with oleic acid. Experiments were carried out by using an ultrasonic testing cell. The cell was exposed to a magnetic field of 50 mT in both parallel and perpendicular direction to the waves propagation. A through-transmission mode measurement was applied, where two fixed narrow-band transducers with completely shielded crystal for maximum RFI/EMI immunity (Physical Acoustic R15I-AST, the resonant frequency 150 kHz) served as a transmitter and a receiver. In this way we carried out the measurement of the frequency-dependent ultrasonic response to a rectangle calibrating signal of 5 µs pulse width. Digitized signals were recorded for further analysis. We present the frequency domain analysis of the low-frequency ultrasound in magnetic fluid. The frequency spectrum in magnetic fluid colloidal system was calculated by the Fourier transformation method. Results show that there is a frequency shift in the amplitude-frequency spectrum caused by the step-up magnetic field. The higher the magnetic field, the higher the frequency of the peaks. The effect of particle aggregation in magnetic field on the ultrasound wave propagation is discussed in the paper.

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“…When a magnetic fluid, a liquid suspension of small magnetic particles, is exposed to an external magnetic field, the particles tend to orient themselves in the field, which affects the optical properties of the suspension. [1][2][3][4][5][6][7][8][9][10] In particular, colloidal systems, consisting of oriented anisotropic particles, display linear dichroism, i.e. the optical absorption is determined by orientation of the electric field vector of the incident light relative to orientation of the particle.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of colloidal solutions of SrFe12O19 plate-like nanoparticles featuring extraordinary magnetic-field-dependent optical transmission

et al. 2012

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Hard-magnetic plate-like nanoparticles of SrFe 12 O 19 were synthesised hydrothermally. The particles, fixed in a polymer, exhibited a coercivity in the range 0.9-1.8 kOe, and the saturation magnetization values reached 64 emu g À1 . Electrostatically stabilized aqueous colloidal solutions of the plate-like particles with average thickness of 5-8 nm and average diameter of 30-80 nm were prepared. The nanoparticles readily oriented when applying a weak magnetic field as low as a few Oe, and due to the linear dichroism phenomena a strong change in the optical transmittance of the solution took place. The extinction coefficient ratio for the perpendicular and the parallel light's electric field vector relative to the magnetic field direction was found to be up to 4.5. The experimental results were compared with a theoretical model, in which the optical absorption of the nanoparticles was calculated from the polarizability of oblate ellipsoids.

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The Cotton-Mouton effect in ferrofluids containing rod-like magnetite particles

Cited by 3 publications

References 16 publications

Electrorheology of nanofiber suspensions

Electrorheology of nanofiber suspensions

Ultrasound Frequency Analysis of a Magnetic Fluid in Low-Intensity External Magnetic Field

Synthesis of colloidal solutions of SrFe12O19 plate-like nanoparticles featuring extraordinary magnetic-field-dependent optical transmission

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