Impact of the induced nematohydrodynamics over the Freedericksz transition limit DOI Open Access

Ramisetti Lalitha,

Sourav Mondal

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(2)

Published: Feb. 1, 2024

Liquid crystals (LC) are highly sensitive to the external field. If any (electric or magnetic) field is applied LC domain beyond a critical strength, reorientation of molecules takes place and attains new equilibrated state, aligning direction field, known as Fréedericksz transition. This phenomenon widely used for optical switching in display devices dynamic field-induced optoelectronic applications. In this work, we investigate role induced (nemato-)hydrodynamics by reorganization on dynamics alignment account The three-dimensional nematic modeled using Beris–Edwards framework, minimizing Landau de-Genes free energy, coupled associated fluid flow profile. Previous studies based relaxation alone without impact hydrodynamics. reasonable approximation limit high elastic (material) constant LC, but not true otherwise. response delayed with increase Ericksen number since local effect significantly influence behavior work results helpful understanding hydrodynamics transition related optimal frequency electrical signals, which affect refresh rate LC-based systems.

Language: Английский

Design and optimization of air-cooled heat dissipation structure of an on-board supercapacitor box DOI
Xing Hu,

Yupeng Tian,

Kuo Yang

et al.

Applied Thermal Engineering, Journal Year: 2024, Volume and Issue: 249, P. 123458 - 123458

Published: May 19, 2024

Language: Английский

Citations

5
Chirality, anisotropic viscosity and elastic anisotropy in three-dimensional active nematic turbulence DOI Creative Commons
Nika Kralj, Miha Ravnik, Žiga Kos

et al.

Communications Physics, Journal Year: 2024, Volume and Issue: 7(1)

Published: July 7, 2024

Abstract Various active materials exhibit strong spatio-temporal variability of their orientational order known as turbulence, characterised by irregular and chaotic motion topological defects, including colloidal suspensions, biofilaments, bacterial colonies.In particular in three dimensions, it has not yet been explored how turbulence responds to changes material parameters chirality.Here, we present a numerical study three-dimensional (3D) nematic examining the influence main constants: (i) flow-alignment viscosity, (ii) magnitude anisotropy elastic deformation modes (elastic constants), (iii) chirality. Specifically, this parameter space covers contractile or extensile, flow-aligning flow tumbling, chiral achiral elastically anisotropic fluids. The results are presented using time- space-averaged fields defect density mean square velocity. also discuss velocity possible effective nematics, distinguishing two states—active blue phase turbulence. This research contributes understanding providing sweep help guide future experimental design use materials.

Language: Английский

Citations

2
Streaming electric field, electroviscous effect, and electrokinetic liquid flows in the induced pressure‐driven transport of active liquids in narrow capillaries DOI
Siddhartha Das, Ghansham Rajendrasingh Chandel

Electrophoresis, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 17, 2024

Abstract In this paper, we develop a theory for studying the electrokinetic effects in charged nanocapillary filled with active liquid. The particles present within liquid are self‐driven, demonstrate vortex defects, and enforce circumferentially arranged polarization field. Under such circumstances, there is development of an induced pressure‐gradient‐driven transport dictated (similar to diffusioosmotic transport) by presence axial gradient activity (or concentration particles). This pressure‐driven has profile different from standard Hagen–Poiseuille flow nanocapillary. Also, drives effects, which characterized generation streaming electric field, associated electroosmotic (EOS) opposing flow, electroviscous effect. We quantify these as functions dimensionless parameters that vary inversely strength activity‐induced salt concentrations. Overall, anticipate paper will draw immense attention toward new type phenomena nanoconfinements.

Language: Английский

Citations

2
Active Fréedericksz Transition in Active Nematic Droplets DOI Creative Commons
Salman Alam, Najma Bibi, Abhinav Singh

et al.

Physical Review X, Journal Year: 2024, Volume and Issue: 14(4)

Published: Oct. 3, 2024

Active nematic liquid crystals have the remarkable ability to spontaneously deform and flow in absence of any external driving force. While living materials with orientational order, such as mitotic spindle, can self-assemble quiescent active phases, reconstituted systems often display chaotic, periodic, or circulating flows under confinement. Quiescent nematics are, therefore, quite rare, despite prediction from hydrodynamic theory that confinement between two parallel plates suppress flows. This spontaneous transition—named Fréedericksz transition by analogy conventional passive a magnetic field—has been cornerstone field matter. Here, we report experimental evidence spherical droplets stabilize otherwise chaotic dynamics 3D extensile nematics, giving rise quiescent—yet still out-of-equilibrium—nematic crystal. The when confined larger droplets. composite nature our model system composed bundles microtubules molecular motors dispersed colloidal crystal allows us demonstrate how interplay activity, elasticity, impacts transition. critical diameter increases motor concentration decreases elasticity increases. Experiments simulations also depends on confining geometry, being than width channels. Biochemical assays reveal neither nor energy-consumption rate, confirming phase is stable out-of-equilibrium predicted theoretically. Further experiments dense arrays monodisperse show fluctuations droplet composition smooth close diameter. In conclusion, work provides validation potential applications human health, ecology, soft robotics. Published American Physical Society 2024

Language: Английский

Citations

1
Impact of the induced nematohydrodynamics over the Freedericksz transition limit DOI Open Access

Ramisetti Lalitha,

Sourav Mondal

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(2)

Published: Feb. 1, 2024

Liquid crystals (LC) are highly sensitive to the external field. If any (electric or magnetic) field is applied LC domain beyond a critical strength, reorientation of molecules takes place and attains new equilibrated state, aligning direction field, known as Fréedericksz transition. This phenomenon widely used for optical switching in display devices dynamic field-induced optoelectronic applications. In this work, we investigate role induced (nemato-)hydrodynamics by reorganization on dynamics alignment account The three-dimensional nematic modeled using Beris–Edwards framework, minimizing Landau de-Genes free energy, coupled associated fluid flow profile. Previous studies based relaxation alone without impact hydrodynamics. reasonable approximation limit high elastic (material) constant LC, but not true otherwise. response delayed with increase Ericksen number since local effect significantly influence behavior work results helpful understanding hydrodynamics transition related optimal frequency electrical signals, which affect refresh rate LC-based systems.

Language: Английский

Citations

0