Particle assembling induced by non-homogeneous magnetic field at transformer oil-based ferrofluid/silicon crystal interface by neutron reflectometry

Nagornyi, A. V.; Петренко, В. И.; Rajňák, Michal; Gapon, I. V.; Авдеев, М. В.; Dolník, Bystrík; Bulavin, L. A.; Kopčanský, P.; Τimko, M.

doi:10.1016/j.apsusc.2018.12.197

Cited by 19 publications

(11 citation statements)

References 39 publications

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“…Note that as we use permanent magnets to generate the magnetic field inhomogeneities cannot be excluded. These may lead to additional self-assembly, as observed in ref ( 36 ), but with the same trend of more pronounced assembly for the larger particles.…”

Section: Resultssupporting

confidence: 67%

Magnetic Particle Self-Assembly at Functionalized Interfaces

et al. 2021

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We study the assembly of magnetite nanoparticles in water-based ferrofluids in wetting layers close to silicon substrates with different functionalization without and with an out-of-plane magnetic field. For particles of nominal sizes 5, 15, and 25 nm, we extract density profiles from neutron reflectivity measurements. We show that self-assembly is only promoted by a magnetic field if a seed layer is formed at the silicon substrate. Such a layer can be formed by chemisorption of activated N -hydroxysuccinimide ester-coated nanoparticles at a (3-aminopropyl)triethoxysilane functionalized surface. Less dense packing is reported for physisorption of the same particles at a piranha-treated (strongly hydrophilic) silicon wafer, and no wetting layer is found for a self-assembled monolayer of octadecyltrichlorosilane (strongly hydrophobic) at the interface. We show that once the seed layer is formed and under an out-of-plane magnetic field further wetting layers assemble. These layers become denser with time, larger magnetic fields, higher particle concentrations, and larger moment of the nanoparticles.

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Section: Resultssupporting

confidence: 67%

Magnetic Particle Self-Assembly at Functionalized Interfaces

et al. 2021

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“…Indeed, according to the literature [ 30 ], this magnetic field intensity is enough to yield long magnetic rods. Since a nonhomogeneous magnetic field may introduce inhomogeneities (e.g., layered structures at the interface between a ferrofluid and a solid [ 56 ]), the magnetic field distribution throughout the sample volume was verified. By obtaining a magnetic field map it was demonstrated that the magnetic field intensity was slightly inhomogeneous across the sample volume (0.45 T near the pole and 0.38 T at the outer side of the vessel).…”

Section: Methodsmentioning

confidence: 99%

Magnetic-field-assisted synthesis of anisotropic iron oxide particles: Effect of pH

Shibaev¹,

Shvets²,

Kessel³

et al. 2020

Beilstein J. Nanotechnol.

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The synthesis of magnetite (Fe3O4) nanorods using reverse co-precipitation of Fe3+ and Fe2+ ions in the presence of a static magnetic field is reported in this work. The phase composition and crystal structure of the synthesized material were investigated using electron diffraction, Raman spectroscopy, and transmission electron microscopy. It was shown that the morphology of the reaction product strongly depends on the amount of OH− ions in the reaction mixture, varying from Fe3O4 nanorods to spherical Fe3O4 nanoparticles. Fe3O4 nanorods were examined using high-resolution transmission electron microscopy proving that they are single-crystalline and do not have any preferred crystallographic orientation along the axis of the rods. According to the data obtained a growth mechanism was proposed for the rods that consists of the dipole–dipole interaction between their building blocks (small hexagonal faceted magnetite nanocrystals), which are formed during the first step of the reaction. The study suggests a facile, green and controllable method for synthesizing anisotropic magnetic nanoparticles in the absence of stabilizers, which is important for further modification of their surfaces and/or incorporation of the nanoparticles into different media.

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“…Thus, to assess the stability and structural properties of magnetic fluids, the experimental methods like UV-VIS and infrared spectroscopies, transmission and scanning electron microscopies, dynamic light scatterings, acoustic measurements, small-angle neutron and X-ray scattering are often utilized. Especially, the application of neutron and X-ray scattering techniques may yield rich information on the morphology, size, concentration, and interaction between the dispersed nanoparticles [7][8][9][10][11][12].…”

Section: Characterization Of Magnetic Fluidsmentioning

confidence: 99%

Modification of Diamagnetic Materials Using Magnetic Fluids

et al. 2020

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Magnetic fluids (ferrofluids) have found many important applications in various areas of biosciences, biotechnology, medicine, and environmental technology. In this review, we have summarized the relevant information dealing with a magnetic modification of diamagnetic materials using different types of ferrofluids. Special attention is focused on a magnetic modification of plant-derived biomaterials, microbial and microalgal cells, eukaryotic cells, biopolymers, inorganic materials, and organic polymers. Derivatization is usually caused by the presence of magnetic iron oxide nanoparticles within the pores of treated materials, on the materials surface or within the polymer gels. The obtained smart materials exhibit several types of responses to an external magnetic field, especially the possibility of the selective magnetic separation from difficult-to-handle environments by means of a magnetic separator. The ferrofluid-modified materials have been especially used as adsorbents, carriers, composite nanozymes or whole-cell biocatalysts.

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Particle assembling induced by non-homogeneous magnetic field at transformer oil-based ferrofluid/silicon crystal interface by neutron reflectometry

Cited by 19 publications

References 39 publications

Magnetic Particle Self-Assembly at Functionalized Interfaces

Magnetic Particle Self-Assembly at Functionalized Interfaces

Magnetic-field-assisted synthesis of anisotropic iron oxide particles: Effect of pH

Modification of Diamagnetic Materials Using Magnetic Fluids

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