Dielectric spectroscopy of liquid crystal doped with Fe3O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" display="inline" overflow="scroll"><mml:msub><mml:mrow/><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:math> nanoparticles

Kopčanský, P.; Koval’chuk, A. V.; Gornitska, Olga; Vovk, V. E.; Kovalchuk, T.M.; Tomašovičov, Natália; Koneracká, M.; Τimko, M.; Závišová, V.; Jadżyn, Jan; Éber, Nándor; Studenyak, I. P.

doi:10.1016/j.phpro.2010.11.010

Cited by 12 publications

(6 citation statements)

References 4 publications

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“…where n o and n e are the refractive indices of the ordinary and the extraordinary rays, respectively. Using condition (14), reduced phase lag (36) in ferronematic distorted by applied magnetic and electric fields can be written as…”

Section: Optical Phase Lagmentioning

confidence: 99%

“…Here g 0 h g(4 0 , j 0 ) is the distribution function of magnetic particles, 4 0 h 4(0) and j 0 h j(0) are angles of director and magnetization orientation in the middle of the layer, respectively. Integration of eqn (14) for z > 0 with boundary conditions (10) gives ð 4ðzÞ…”

Section: Orientational Equilibrium Equationsmentioning

confidence: 99%

“…In recent years there have been many experimental [11][12][13][14][15][16] and theoretical [17][18][19] works on the physical properties of magnetic suspensions based on liquid crystals and the peculiarities of their behavior in external fields. A detailed review of the history of research, classification, the most interesting experimental and theoretical results, as well as numerous applications of liquid-crystalline nanocolloids can be found in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Interplay between dipole and quadrupole modes of field influence in liquid-crystalline suspensions of ferromagnetic particles

Makarov

Zakhlevnykh

2012

Soft Matter

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In the framework of continuum theory we study orientational transitions induced by electric and magnetic fields in ferronematics, i.e., in liquid-crystalline suspensions of ferromagnetic particles. We have shown that in a certain electric field range the magnetic field can induce a sequence of re-entrant orientational transitions in ferronematic layer: nonuniform phase -uniform phasenonuniform phase. This phenomenon is caused by the interplay between the dipole (ferromagnetic) and quadrupole (dielectric and diamagnetic) mechanisms of the field influence on a ferronematic structure. We have found that these re-entrant Freedericksz transitions exhibit tricritical behavior, i.e., they can be of the first or the second order. The character of the transitions depends on a degree of redistribution of magnetic admixture in the sample exposed to uniform magnetic field (magnetic segregation). We demonstrate how electric and magnetic fields can change the order of orientational transitions in ferronematics. We show that electric Freedericksz transitions in ferronematics subjected to magnetic field have no re-entrant nature. Tricritical segregation parameters for the transitions induced by electric or magnetic fields are obtained analytically. We demonstrate the re-entrant behavior of ferronematic by numerical simulations of the magnetization and optical phase lag.

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Section: Optical Phase Lagmentioning

confidence: 99%

Section: Orientational Equilibrium Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interplay between dipole and quadrupole modes of field influence in liquid-crystalline suspensions of ferromagnetic particles

Makarov

Zakhlevnykh

2012

Soft Matter

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“…These special liquid crystal properties make them well utilized in practical applications. [14][15][16][17] Supramolecular liquid crystal materials are assembled from supramolecules and liquid crystals by noncovalent interactions such as van der Waals forces, hydrogen bonding, halogen bonding, coordination bonding, and ionic dipole distance. 18,19 Not only do they possess the stimulus responsiveness of liquid crystals, but also the physical and chemical properties associated with grafted groups.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of liquid crystal Fe₃O₄ composites and their magnetorheological properties

Wang,

Chang,

Diao

et al. 2024

Polymers for Advanced Techs

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Some supramolecular polyacrylate‐based liquid crystal polymers (PLCPs) were prepared by polyacrylic acid, a liquid crystal monomer and 3,5‐pyridinedicarboxylic acid. Series of magnetic liquid crystal particles (Fe3O4@PLCPs) with core‐shell structure were prepared by modifying surface of magnetic nanoparticles Fe3O4 by the PLCPs. The Fe3O4@PLCPs showed a saturation magnetization strength above 51.17 emu/g, which is similar to pure magnetic Fe3O4, indicating good magnetism and magnetic field dependence. Series of magnetorheological fluids were fabricated by Fe3O4@PLCPs (using as dispersed phase) and silicone oil (using as carrier liquid). The effects of mesogen, magnetic particle, and the polymer matrix on magnetorheological performance and settling stability were investigated. The magnetorheological fluid based on 10% Fe3O4@PLCP‐1 showed the best performance at an applied magnetic field of 100 mT in this study. Furthermore, the magnetorheological fluids showed excellent settling stability because the density of Fe3O4@PLCPs was lower than that of Fe3O4. The Fe3O4@PLCPs‐based fluids presented certain application potential in the field of magnetic fluid due to the excellent magnetorheological effect and settling stability.

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“…Легирование нематика небольшим количеством ферроэлектрических наночастиц сильно влияло на диэлектрические свойства системы [7,12,13]. Статическая диэлектрическая проницаемость и диэлектри-ческая анизотропия суспензии были в два раза больше, чем у чистого нематического жидкого кристалла (НЖК).…”

Section: Introductionunclassified

Permittivity dispersion features of a nematic liquid crystal with quantum dots

Павлович¹,

Анатольевна²,

Анатольевна³

2015

Naučno-teh. vestn. inf. tehnol. meh. opt.

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Dielectric spectroscopy of liquid crystal doped with Fe3O4 nanoparticles

Cited by 12 publications

References 4 publications

Interplay between dipole and quadrupole modes of field influence in liquid-crystalline suspensions of ferromagnetic particles

Interplay between dipole and quadrupole modes of field influence in liquid-crystalline suspensions of ferromagnetic particles

Fabrication of liquid crystal Fe₃O₄ composites and their magnetorheological properties

Permittivity dispersion features of a nematic liquid crystal with quantum dots

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Dielectric spectroscopy of liquid crystal doped with Fe3O4 nanoparticles

Cited by 12 publications

References 4 publications

Interplay between dipole and quadrupole modes of field influence in liquid-crystalline suspensions of ferromagnetic particles

Interplay between dipole and quadrupole modes of field influence in liquid-crystalline suspensions of ferromagnetic particles

Fabrication of liquid crystal Fe3O4 composites and their magnetorheological properties

Permittivity dispersion features of a nematic liquid crystal with quantum dots

Contact Info

Product

Resources

About

Fabrication of liquid crystal Fe₃O₄ composites and their magnetorheological properties