Investigation of magneto-optical properties of ferrofluids by laser light scattering techniques

Nepomnyashchaya, Elina; Prokofiev, A. V.; Velichko, Elena; Плешаков, И. В.; Kuz’min, Yu. I.

doi:10.1016/j.jmmm.2016.10.002

Cited by 32 publications

(10 citation statements)

References 10 publications

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“…The diameter of solid phase nanoparticles was about 10 nm, which is typical of magnetic fluids prepared by the methods described in [ 71 ]. Their spontaneous clustering (still present in insignificant quantities in the systems similar to that considered in [ 72 ]) was prevented by the formation of an electric double layer by decreasing pH and inducing a positive charge at the oxide surface. The required parameters of the aqueous medium were achieved by adding hydrochloric acid until reaching a concentration of H + ions approximately equal to 10 −5 mol/L, which corresponded to pH ≈ 5.…”

Section: Methodsmentioning

confidence: 99%

Aggregation Properties of Albumin in Interacting with Magnetic Fluids

Velichko

Nepomnyashchaya

Baranov

et al. 2021

IJMS

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In this study, interactions of Fe3O4 magnetic nanoparticles with serum albumin biomolecules in aqueous solutions were considered. The studies were conducted with the laser correlation spectroscopy and optical analysis of dehydrated films. It was shown that the addition of magnetite to an albumin solution at low concentrations of up to 10−6 g/L led to the formation of aggregates with sizes of up to 300 nm in the liquid phase and an increase in the number of spiral structures in the dehydrated films, which indicated an increase in their stability. With a further increase in the magnetite concentration in the solution (from 10−4 g/L), the magnetic particles stuck together and to albumin, thus forming aggregates with sizes larger than 1000 nm. At the same time, the formation of morphological structures in molecular films was disturbed, and a characteristic decrease in their stability occurred. Most stable films were formed at low concentrations of magnetic nanoparticles (less than 10−4 g/L) when small albumin–magnetic nanoparticle aggregates were formed. These results are important for characterizing the interaction processes of biomolecules with magnetic nanoparticles and can be useful for predicting the stability of biomolecular films with the inclusion of magnetite particles.

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Section: Methodsmentioning

confidence: 99%

Aggregation Properties of Albumin in Interacting with Magnetic Fluids

Velichko

Nepomnyashchaya

Baranov

et al. 2021

IJMS

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“…Water is of frequent use as a carrier liquid (see, e.g., Refs. [57][58][59]). The dielectric permittivity of water along the imaginary frequency axis is well described in the oscillator representation [60] ε c (iξ) = 1…”

Section: The Case Of Water-based Interlayermentioning

confidence: 99%

Impact of magnetic nanoparticles on the Casimir pressure in three-layer systems

2019

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The Casimir pressure is investigated in three-layer systems where the intervening stratum possesses magnetic properties. This subject is gaining in importance in connection with ferrofluids and their use in various microelectromechanical devices. We present general formalism of the Lifshitz theory adapted to the case of ferrofluid sandwiched between two dielectric walls. The Casimir pressure is computed for the cases of kerosene-and water-based ferrofluids containing a 5% fraction of magnetite nanoparticles with different diameters between silica glass walls. For this purpose, we have found the dielectric permittivities of magnetite and kerosene along the imaginary frequency axis employing the available optical data and used the familiar dielectric properties of silica glass and water, as well as the magnetic properties of magnetite. We have also computed the relative difference in the magnitudes of the Casimir pressure which arises on addition of magnetite nanoparticles to pure carrier liquids. It is shown that for nanoparticles of 20 nm diameter at 2 micrometer separation between the walls this relative difference exceeds 140% and 25% for kerosene-and water-based ferrofluids, respectively. An interesting effect is found that at a fixed separation between the walls an addition of magnetite nanoparticles with some definite diameter makes no impact on the Casimir pressure. The physical explanation for this effect is provided.Possible applications of the obtained results are discussed.

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“…The principle of operation of these devices was based on a physical phenomenon that a magnetic field applied to FF changes its optical characteristics, including the refractive index n. The mechanisms of these changes in the material parameters are mainly associated with the formation of structures-agglomerates composed of nanoparticles of the solid phase of the substance. The agglomerates' size and their growth dynamics are governed by the field [17]. There are, probably, other contributions to this effect determined by the properties of individual nanoparticles [18].…”

Section: Introductionmentioning

confidence: 99%

Ferrofluidic sensitive element in fiber optics

Плешаков

Agruzov

2021

Supl. Rev. Mex. Fis.

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This article discusses problems related to the use of ferrofluid, infiltrated in a microstructured optical fiber and controlled by an external magnetic field. It summarizes the results obtained by the authors on a fiber filled with this substance and subjected to harmonic or impulse field action. It is shown that magneto-optical effects are observed here, which significant for designing tunable fiber elements.

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Investigation of magneto-optical properties of ferrofluids by laser light scattering techniques

Cited by 32 publications

References 10 publications

Aggregation Properties of Albumin in Interacting with Magnetic Fluids

Aggregation Properties of Albumin in Interacting with Magnetic Fluids

Impact of magnetic nanoparticles on the Casimir pressure in three-layer systems

Ferrofluidic sensitive element in fiber optics

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