The Influence of Single-Walled Carbon Nanotubes on the Dynamic Properties of Nematic Liquid Crystals in Magnetic Field

Cîrtoaje, Cristina; Petrescu, Emil

doi:10.3390/ma12244031

Cited by 8 publications

(4 citation statements)

References 34 publications

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“…The effects of applied electric fields on the alignment of CNTs in LCs have been intensively discussed in many recent theoretical and experimental studies [122][123][124][125][126][127][128][129][130][131].…”

Section: Nematic Liquid Crystalsmentioning

confidence: 99%

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Effects of Dispersed Carbon Nanotubes and Emerging Supramolecular Structures on Phase Transitions in Liquid Crystals: Physico-Chemical Aspects

Lisetski

Bulavin

Lebovka

2023

Liquids

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The current state of the study of different liquid crystalline (LC) systems doped with carbon nanotubes (CNTs) is discussed. An attempt is endeavored to outline the state-of-the-art technology that has emerged after two past decades. Systematization and analysis are presented for the integration of single- and multi-walled carbon nanotubes in thermotropic (nematic, smectic, cholesteric, ferroelectric, etc.) and lyotropic LCs. Special attention is paid to the effects of alignment and supramolecular organization resulting from orientational coupling between CNTs and the LC matrix. The effects of the specific inter-molecular and inter-particle interactions and intriguing microstructural, electromagnetic, percolation, optical, and electro-optical properties are also discussed.

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Section: Nematic Liquid Crystalsmentioning

confidence: 99%

“…The dynamic behavior of CNT-nematic LC composites in the electric and magnetic fields has been analyzed both theoretically and experimentally [124,[127][128][129][130][131]. A theoretical model based on elastic continuum theory allowed the evaluation of the relaxation times [124].…”

Section: Nematic Liquid Crystalsmentioning

confidence: 99%

Effects of Dispersed Carbon Nanotubes and Emerging Supramolecular Structures on Phase Transitions in Liquid Crystals: Physico-Chemical Aspects

Lisetski

Bulavin

Lebovka

2023

Liquids

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“…Свойства ЖКкомпозитов дополняются набором специфических особенностей, связанных со свойствами материала наночастиц-допантов: металлическими, полупроводниковыми, ферромагнитными или сегнетоэлектрическими и т.д. Стоит отметить новые типы дипольных или квадрупольных частиц, внедряемых в нематические ЖК: магнитные дискообразные частицы [5,7,8], углеродные нанотрубки (УНТ) [16][17][18], в том числе допированные и функционализированные ферромагнетиком УНТ [3,6], веретенообразные частицы [10], а также наностержни гетита [14,15], которые заслуживают особого внимания. Частицы гетита обладают собственным магнитным моментом, направленным вдоль длинной оси частицы.…”

Section: Introductionunclassified

Field-Induced Stratification of Goethite Particles in Nematic Matrix

Petrov¹,

Khannanov²

2022

Liq. Cryst. and their Appl.

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Within the continuum theory, the stratification of colloidal goethite particles in a nematic matrix induced by magnetic and gravitational fields has been studied. The case of a magnetically compensated suspension, which is a liquid crystal analogue of an antiferromagnet, is considered. For a twist structure, the spatial distributions of the fields of the director of the liquid crystal medium and the dispersed phase are studied. The distributions of goethite impurity particles over the layer thickness are calculated for different values of the magnetic field. The obtained equations of orientational and magnetic equilibrium of suspensions of goethite particles in a nematic have a general form and, in limiting cases, can be used to describe liquid crystal suspensions of anisometric ferromagnetic particles and carbon nanotubes.

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“…The combined effect of magnetic and elastic torques on these CPs is used to estimate their magnetic dipole moment and to control their self-assembly along small chains [ 16 ]. Understanding the dynamics of anisotropic nematic colloids under magnetic fields is an important scientific challenge with additional applications in the use of nanoparticles for tuning the Freedericksz transition threshold and orientation relaxation times in liquid crystal cells [ 43 ].…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium Dynamics of a Magnetic Nanocapsule in a Nematic Liquid Crystal

Armendáriz¹,

Híjar²

2021

Materials

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Colloidal particles in nematic liquid crystals show a beautiful variety of complex phenomena with promising applications. Their dynamical behaviour is determined by topology and interactions with the liquid crystal and external fields. Here, a nematic magnetic nanocapsule reoriented periodically by time-varying magnetic fields is studied using numerical simulations. The approach combines Molecular Dynamics to resolve solute–solvent interactions and Nematic Multiparticle Collision Dynamics to incorporate nematohydrodynamic fields and fluctuations. A Saturn ring defect resulting from homeotropic anchoring conditions surrounds the capsule and rotates together with it. Magnetically induced rotations of the capsule can produce transformations of this topological defect, which changes from a disclination curve to a defect structure extending over the surface of the capsule. Transformations occur for large magnetic fields. At moderate fields, elastic torques prevent changes of the topological defect by tilting the capsule out from the rotation plane of the magnetic field.

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The Influence of Single-Walled Carbon Nanotubes on the Dynamic Properties of Nematic Liquid Crystals in Magnetic Field

Cited by 8 publications

References 34 publications

Effects of Dispersed Carbon Nanotubes and Emerging Supramolecular Structures on Phase Transitions in Liquid Crystals: Physico-Chemical Aspects

Effects of Dispersed Carbon Nanotubes and Emerging Supramolecular Structures on Phase Transitions in Liquid Crystals: Physico-Chemical Aspects

Field-Induced Stratification of Goethite Particles in Nematic Matrix

Nonequilibrium Dynamics of a Magnetic Nanocapsule in a Nematic Liquid Crystal

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