Motion of a deformable drop of magnetic fluid on a solid surface in a rotating magnetic field

Zakinyan, Arthur; Nechaeva, O. A.; Dikansky, Yuri

doi:10.1016/j.expthermflusci.2012.01.003

Cited by 38 publications

(23 citation statements)

References 13 publications

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“…When subjected to a rotating magnetic field circularly polarized in the ( x , z ) plane H ( t ) = H 0 (cos (2 πft ) e x − sin (2 πft ) e z ), the LRM tends to spin to follow the field because the rotating magnetic field generates torques on the suspended magnetic nanoparticles in the ferrofluid, together with the viscous coupling between the particles and the surrounding carriers cause the droplet to follow externally rotate H . [ 35 ] If closed to the substrate, the rotating LRM will become a surface walker, as shown in Figure 2d. Usually, because the Reynolds coefficient (Re) is much smaller than 1, which is about 10 −3 or less at the micrometer scale, the inertial force of the LRM can be neglected, and its kinematic equation degenerates into a first‐order model.…”

Section: Resultsmentioning

confidence: 99%

Ferrofluid Droplets as Liquid Microrobots with Multiple Deformabilities

Fan

Sun

et al. 2020

Adv Funct Materials

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Developing microrobots with multiple deformabilities has become extremely challenging due to the lack of materials that are soft enough at the microscale level and the inability to be reconfigured after fabrication. In this study, it is aimed to prove that liquid microrobots composed of ferrofluid droplets are inherently deformable and they can be controlled, individually or in aggregate, with multiple programmable deformabilities. For example, the liquid‐microrobot monomer (LRM) can pass through narrow channels via elongation and achieve scaling via splitting and coalescence. LRMs can also reassemble into various kinds of functional liquid‐robot aggregates, such as microsticks, micropies, microtrains, microkayaks, and microrollingpins. Thus, they can respond to multi‐terrain surfaces or perform various complex tasks. Moreover, the authors' physics‐based theoretical model demonstrates dynamic self‐assembly and group behavior of a multiple LRM system, which is conducive to investigating the mechanisms behind it. These ferrofluid droplet robots provide novel solutions for some potential applications, such as untethered micromanipulation and targeted cargo delivery.

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Section: Resultsmentioning

confidence: 99%

Ferrofluid Droplets as Liquid Microrobots with Multiple Deformabilities

Fan

Sun

et al. 2020

Adv Funct Materials

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“…For frequencies up to 40 Hz, an s-shape, or spiral, formation of the ferrofluid has also been investigated [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…e basis for the construction of an RMF was taken from [13] and [15][16][17] and modified in such a way that magnetic fields could be generated suitable for medical hyperthermia.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Fluids’ Heating Power Exposed to a High‐Frequency Rotating Magnetic Field

Beković

Trbušić

Trlep

et al. 2018

Advances in Materials Science and Engineering

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Magnetic fluids are superparamagnetic materials that have recently been the subject of extensive research because of their unique properties. Among them is the heating effect when exposed to an alternating magnetic field, wherein the objective is to use this property in medicine as an alternative method for the treatment of tumors in the body. e heating effect characterization for the alternating magnetic field (AMF) has been studied widely, whilst for the rotational magnetic field (RMF), no systematic study has been done yet. In this article, we present the characterization of the heating power of magnetic fluids in a high-frequency rotational magnetic field. e results show similar behavior of heating power or specific absorption rate characteristics as in AMF.

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“…Moreover, they offer a broad range of application prospectives such as in medicine [11][12][13] and technology [14][15][16][17]. However, whereas such ferrofluids, i.e., colloidal suspensions of magnetic particles in isotropic liquids, display fascinating behaviors in the presence of an external magnetic field, actual systems exhibit only zero net magnetization once the external field is switched off, i.e., there is no occurrence of spontaneous symmetry breaking [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effective Landau theory of ferronematics

Zarubin

Bier

Dietrich

2018

The Journal of Chemical Physics

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An effective Landau-like description of ferronematics, i.e., suspensions of magnetic colloidal particles in a nematic liquid crystal (NLC), is developed in terms of the corresponding magnetization and nematic director fields. The study is based on a microscopic model and on classical density functional theory. Ferronematics are susceptible to weak magnetic fields and they can exhibit a ferromagnetic phase, which has been predicted several decades ago and has recently been found experimentally. Within the proposed effective Landau theory of ferronematics, one has quantitative access, e.g., to the coupling between the magnetization of the magnetic colloids and the nematic director of the NLC. On mesoscopic length scales, this generates complex response patterns.

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Motion of a deformable drop of magnetic fluid on a solid surface in a rotating magnetic field

Cited by 38 publications

References 13 publications

Ferrofluid Droplets as Liquid Microrobots with Multiple Deformabilities

Ferrofluid Droplets as Liquid Microrobots with Multiple Deformabilities

Magnetic Fluids’ Heating Power Exposed to a High‐Frequency Rotating Magnetic Field

Effective Landau theory of ferronematics

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