Magnetic Fluids and Their Complex Systems

Kopčanský, P.; Τimko, M.; Koneracká, M.; Závišová, V.; Kubovčíková, Martina; Molčan, Matúš; Balejčíková, Lucia; Tomašovičová, Natália; Rajňák, Michal; Gdovinová, Veronika

doi:10.1007/978-3-319-61109-9_8

Cited by 3 publications

(2 citation statements)

References 133 publications

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“…Researchers also use dipole-dipole interactions to control physical properties by applying magnetic fields. A typical example is magnetic fluid that is a liquid in which ferromagnetic nanoparticles are highly dispersed [113][114][115]. Applying a magnetic field enhances the interactions between the particles in the fluid, thereby increasing the viscosity.…”

Section: Magnetic Dipole-dipole Interactionmentioning

confidence: 99%

Magnetic Processing of Diamagnetic Materials

Yamato

Kimura

2020

Polymers

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Currently, materials scientists and nuclear magnetic resonance spectroscopists have easy access to high magnetic fields of approximately 10 T supplied by superconducting magnets. Neodymium magnets that generate magnetic fields of approximately 1 T are readily available for laboratory use and are widely used in daily life applications, such as mobile phones and electric vehicles. Such common access to magnetic fields—unexpected 30 years ago—has helped researchers discover new magnetic phenomena and use such phenomena to process diamagnetic materials. Although diamagnetism is well known, it is only during the last 30 years that researchers have applied magnetic processing to various classes of diamagnetic materials such as ceramics, biomaterials, and polymers. The magnetic effects that we report herein are largely attributable to the magnetic force, magnetic torque, and magnetic enthalpy that in turn, directly derive from the well-defined magnetic energy. An example of a more complex magnetic effect is orientation of crystalline polymers under an applied magnetic field; researchers do not yet fully understand the crystallization mechanism. Our review largely focuses on polymeric materials. Research topics such as magnetic effect on chiral recognition are interesting yet beyond our scope.

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Section: Magnetic Dipole-dipole Interactionmentioning

confidence: 99%

Magnetic Processing of Diamagnetic Materials

Yamato

Kimura

2020

Polymers

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“…In a recent publication [18], we have described a new coupling scheme to microconvective motion, exploiting the analogy between thermogravitational buoyancy ρfalse(T,cfalse)bold-italicg and magnetomechanical Kelvin force μ0false(bold-italicMnormal∇false)bold-italicH∝χfalse(T,cfalse)normal∇H2 [19] in nanofluids, which are synthetically modified by addition of suspended ferromagnetic nanoparticles [20]. Here, bold-italicM is fluid magnetization, bold-italicH magnetic field strength, μ0 magnetic constant and χ magnetic susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Optothermal grid activation of microflow with magnetic nanoparticle thermophoresis for microfluidics

Zablotsky

Mezulis

Blums

et al. 2022

Phil. Trans. R. Soc. A.

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We report focused light-induced activation of intense magnetic microconvection mediated by suspended magnetic nanoparticles in microscale two-dimensional optothermal grids. Fully anisotropic control of microflow and mass transport fluxes is achieved by engaging the magnetic field along one or the other preferred directions. The effect is based on the recently described thermal diffusion–magnetomechanical coupling in synthetic magnetic nanofluids. We expect that the new phenomenon can be applied as an efficient all-optical mixing strategy in integrated microfluidic devices. This article is part of the theme issue ‘Transport phenomena in complex systems (part 2)’.

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