scholarly journals A connection between living liquid crystals and electrokinetic phenomena in nematic fluids

Soft Matter ◽  
2018 ◽  
Vol 14 (22) ◽  
pp. 4641-4648 ◽  
Author(s):  
Christopher Conklin ◽  
Jorge Viñals ◽  
Oriol T. Valls
Keyword(s):  
Liquid Crystals ◽  
Topological Defects ◽  
Electrokinetic Phenomena ◽  
Formal Analogy

We develop a formal analogy between configurational stresses in physically distinct systems, and study the flows that they induce when the configurations of interest include topological defects.

scholarly journals Properties of twisted topological defects in 2D nematic liquid crystals

Soft Matter ◽  
2021 ◽  
Author(s):  
Daniel Pearce ◽  
Karsten Kruse
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Topological Defects ◽  
Two Dimensional

Topological defects are one of the most conspicuous features of liquid crystals. In two dimensional nematics, they have been shown to behave effectively as particles with both, charge and orientation,...

scholarly journals Derivation of coarse-grained force fields for buckling-induced topological defects of liquid crystals

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Michiaki Sakamoto ◽  
Itsuo Hanasaki
Keyword(s):  
Liquid Crystals ◽  
Force Fields ◽  
Topological Defects ◽  
Coarse Grained

scholarly journals Pair creation, motion, and annihilation of topological defects in two-dimensional nematic liquid crystals

2018 ◽  
Vol 97 (2) ◽  
Author(s):  
Dario Cortese ◽  
Jens Eggers ◽  
Tanniemola B. Liverpool
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Topological Defects ◽  
Pair Creation ◽  
Two Dimensional

Gradient free energy of nematic liquid crystals with topological defects

1986 ◽  
Vol 19 (7) ◽  
pp. 937-942 ◽  
Author(s):  
H R Brand ◽  
K Kawasaki
Keyword(s):  
Free Energy ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Topological Defects

Defect Nucleation and Annihilation in Sheared Polymeric Liquid Crystals

2002 ◽  
Vol 734 ◽  
Author(s):  
Dana Grecov ◽  
Alejandro D. Rey
Keyword(s):  
Liquid Crystals ◽  
Shear Rate ◽  
Long Range ◽  
Short Range ◽  
Practical Importance ◽  
Topological Defects ◽  
Annihilation Rate ◽  
Shear Rates ◽  
Parallel Array ◽  
Defect Nucleation

ABSTRACTShear–induced nucleation and annihilation of topological defects due to hydrodynamic instability in nematic liquid crystals is a phenomenon of both scientific interest and practical importance. We use a complete generalized non-linear second order tensor Landau-de Gennes model that takes into account short range order elasticity, long-range elasticity and viscous effects, to simulate the nucleation and annihilation of twist inversion walls in flow-aligning nematic polymers subjected to shear flow. Shearing a homogeneous nematic sample perpendicular to the director results in an linear instability that maybe symmetric at low shear rates, and antisymmetric at higher shear rates. At even higher shear rates the onset of nonlinearities results in the nucleation of a parallel array of twist inversion walls, such that asymmetry prevails. By increasing the shear rate the following director symmetry transition cascade is observed: symmetric → antisymmetric → asymmetric → symmetric. The nucleation of the parallel array of twist inversion walls in the asymmetric mode is due to the degeneracy in reorientation towards the shear plane. The annihilation of twist walls is mediated by twist waves along the velocity gradient direction. Twist walls annihilate by three mechanisms: wall-wall annihilations, wall-wall coalescence, and wall-bounding surface coalescence. The annihilation rate increases with increasing shear rate and at sufficiently high rates the layered structure is replaced by a homogeneously aligned system. The role of short range and long range elasticity on defect nucleation and annihilation is characterized in terms of the Deborah and Ericksen numbers. Close form solutions to approximated equations are used to explain the numerical results of the full Landau-de Gennes equations of nematodynamics.

scholarly journals Shape-Dependent Oriented Trapping and Scaffolding of Plasmonic Nanoparticles by Topological Defects for Self-Assembly of Colloidal Dimers in Liquid Crystals

Nano Letters ◽  
2012 ◽  
Vol 12 (2) ◽  
pp. 955-963 ◽  
Author(s):  
Bohdan Senyuk ◽  
Julian S. Evans ◽  
Paul J. Ackerman ◽  
Taewoo Lee ◽  
Pramit Manna ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Self Assembly ◽  
Topological Defects ◽  
Plasmonic Nanoparticles

Electrically controlled topological defects in liquid crystals as tunable spin-orbit encoders for photons

2011 ◽  
Vol 36 (5) ◽  
pp. 719 ◽  
Author(s):  
Etienne Brasselet ◽  
Charles Loussert
Keyword(s):  
Liquid Crystals ◽  
Topological Defects ◽  
Spin Orbit ◽  
Defects In Liquid Crystals
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