Macroscopic Properties of Ferronematics Caused by Orientational Interactions on the Particle Surfaces. II. Behavior of Real Ferronematics in External Fields

Бурылов, С. В.; Raǐkher, Yu. L.

doi:10.1080/10587259508034553

Cited by 58 publications

(32 citation statements)

References 7 publications

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“…We note that this nondimensionalization scheme differs from that in a number of previous papers [10,11,13,14]. In the previous normalization scheme, it turns out not to be possible to remove the magnetic segregation in a regular way.…”

Section: Fig 1 Schematic Of the Fn Cell The Total Magnetic Field Imentioning

confidence: 56%

“…This point has been addressed briefly by Burylov and Raikher [10,11]. However, a detailed discussion of this point goes beyond the scope of this paper.…”

Section: Fig 1 Schematic Of the Fn Cell The Total Magnetic Field Imentioning

confidence: 88%

“…Equation (14b) is the bonding equation of Burylov and Raikher [10,11]. It is apparent that so long as the ratio h w 1, we can expect that θ ≈ ψ.…”

Section: Finite Ferronematic Couplingmentioning

confidence: 99%

“…Burylov and Raikher [10,11] have derived an effective soft homeotropic anchoring energy W p per colloidal particle due to the nematic-ferroparticle surface interaction. We do not discuss the microscopic derivation of the magnitude of this interaction here but simply note that in our discussion it is a measurable parameter which enters the theory.…”

Section: Fig 1 Schematic Of the Fn Cell The Total Magnetic Field Imentioning

confidence: 99%

“…The initial continuum theory [1] has been generalized by Burylov and Raikher [10,11] to the case of a finite anchoring energy of the nematic at the ferroparticle surface. This provided an explanation for the absence of coalignment of the nematic directorn and the averaged local magnetization M in the FN, as had been found experimentally [12].…”

Section: Introduction In 1970 Brochard and De Gennesmentioning

confidence: 99%

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The Frederiks Effect and Related Phenomena in Ferronematic Materials

Zadorozhnii¹,

Sluckin²,

Reshetnyak³

et al. 2008

SIAM J. Appl. Math.

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Abstract. Using continuum and statistical mechanical theories, we study the switching properties of a ferronematic in a nematic liquid crystal cell subject to homeotropic boundary conditions at the cell and particle walls. An external magnetic field normal to the cell plane is also imposed. At low fields we find thresholdless switching of the nematic director, consistent with experimental data. At higher fields, there are three regimes, depending on the strength of the anchoring interaction between the director and the ferroparticle orientation. For low anchoring strengths, there is an inverse Frederiks effect, and the nematic reorientation reduces and then disappears continuously at a critical magnetic field. At intermediate fields, the degree of reorientation reduces at high fields but remains finite. For high fields, however, the director switching saturates. The dimensionless temperature scale in the problem involves the temperature, the mean nematic elastic constant, the colloidal density, and the cell dimension. If this quantity is sufficiently low, then high magnetic fields can cause magnetic segregation. The segregation order parameter is coupled to the director distortion, and this can change the inverse Frederiks transition into a first order transition, leading to bistability in an intermediate field regime. These features are perturbed but not changed structurally by the effect of a small bias magnetic field (< 10 Oe) normal to the unperturbed director. Subject to suitable choice of parameters, the theory is also quantitatively consistent with the results of the classic experiment of Chen and Amer in 1983.

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Section: Fig 1 Schematic Of the Fn Cell The Total Magnetic Field Imentioning

confidence: 56%

“…This point has been addressed briefly by Burylov and Raikher [10,11]. However, a detailed discussion of this point goes beyond the scope of this paper.…”

Section: Fig 1 Schematic Of the Fn Cell The Total Magnetic Field Imentioning

confidence: 88%

“…Equation (14b) is the bonding equation of Burylov and Raikher [10,11]. It is apparent that so long as the ratio h w 1, we can expect that θ ≈ ψ.…”

Section: Finite Ferronematic Couplingmentioning

confidence: 99%

Section: Fig 1 Schematic Of the Fn Cell The Total Magnetic Field Imentioning

confidence: 99%

Section: Introduction In 1970 Brochard and De Gennesmentioning

confidence: 99%

See 3 more Smart Citations

The Frederiks Effect and Related Phenomena in Ferronematic Materials

Zadorozhnii¹,

Sluckin²,

Reshetnyak³

et al. 2008

SIAM J. Appl. Math.

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Magnetic Tilting in Nematic Liquid Crystals Driven by Self‐Assembly

Hähsler

Nádasi

Feneberg

et al. 2021

Adv Funct Materials

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Self‐assembly is one of the crucial mechanisms allowing the design multifunctional materials. Soft hybrid materials contain components of different natures and exhibit competitive interactions which drive self‐organization into structures of a particular function. Here a novel type of a magnetic hybrid material where the molecular tilt can be manipulated through a delicate balance between the topologically‐assisted colloidal self‐assembly of magnetic nanoparticles and the anisotropic molecular interactions in a liquid crystal matrix is demonstrated.

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