scholarly journals Nematic colloids, topology and photonics

2013 ◽  
Vol 371 (1988) ◽  
pp. 20120266 ◽  
Author(s):  
I. Muševič
Keyword(s):  
Liquid Crystals ◽  
Recent Progress ◽  
Colloidal Particles ◽  
Topological Defects ◽  
Chiral Nematic

We review and discuss recent progress in the field of nematic colloids, with an emphasis on possible future applications in photonics. The role of the topology is described, based on experimental manipulations of the topological defects in nematic colloids. The topology of the ordering field in nematics provides the forces between colloidal particles that are unique to these materials. We also discuss recent progress in the new field of active microphotonic devices based on liquid crystals (LCs), where chiral nematic microlasers and tuneable nematic microresonators are just two of the recently discovered examples. We conclude that the combination of topology and microphotonic devices based on LCs provides an interesting platform for future progress in the field of LCs.

scholarly journals Introduction to Colloidal and Microfluidic Nematic Microstructures

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 956
Author(s):  
Simon Čopar ◽  
Miha Ravnik ◽  
Slobodan Žumer
Keyword(s):  
Soft Matter ◽  
Liquid Crystalline ◽  
Colloidal Particles ◽  
Topological Defects ◽  
Crystalline Materials ◽  
Inherent Anisotropy ◽  
Metastable Structures ◽  
Liquid Crystalline Materials ◽  
Mesoscopic Theory

In this brief review, we give an introduction to selected colloidal and microfluidic nematic microstructures, as enabled by the inherent anisotropy and microscopic orientational ordering in complex liquid crystalline materials. We give a brief overview of the mesoscopic theory, for equilibrium and dynamics, of nematic fluids, that provides the framework for understanding, characterization, and even prediction of such microstructures, with particular comment also on the role of topology and topological defects. Three types of nematic microstructures are highlighted: stable or metastable structures in nematic colloids based on spherical colloidal particles, stationary nematic microfluidic structures, and ferromagnetic liquid crystal structures based on magnetic colloidal particles. Finally, this paper is in honor of Noel A. Clark, as one of the world pioneers that helped to shape this field of complex and functional soft matter, contributing at different levels to works of various groups worldwide, including ours.

scholarly journals Topological Defect Arrays in Nematic Liquid Crystals Assisted by Polymeric Pillar Arrays: Effect of the Geometry of Pillars

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 314 ◽  
Author(s):  
MinSu Kim ◽  
Francesca Serra
Keyword(s):  
Liquid Crystals ◽  
Topological Defect ◽  
Condensed Matter ◽  
Topological Defects ◽  
Spatial Arrangement ◽  
Photonic Devices ◽  
Elastic Response ◽  
Structured Fluids ◽  
Pillar Arrays

Topological defects that spontaneously occur in condensed matter and structured fluids such as liquid crystals are useful for their elastic and optical properties, but often the applicability of defect arrays to optics and photonic devices relies on the regularity and tunability of the system. In our recent work [Adv. Opt. Mater. 8, 1900991 (2020)], we showed the formation of regular, reconfigurable, and scalable patterns by exploiting the elastic response of a defect array in liquid crystals in the presence of a polymeric pillar array. In this work, we experimentally investigate the role of size and shape of the pillars on the defect array. We find that the pillar size and geometry provide additional means to regulate the response time, the threshold voltage for the defects’ formation, and the spatial arrangement of the defects.

scholarly journals Dual electrically and thermally responsive broadband reflectors based on polymer network stabilized chiral nematic liquid crystals: the role of crosslink density

2016 ◽  
Vol 52 (66) ◽  
pp. 10109-10112 ◽  
Author(s):  
Hitesh Khandelwal ◽  
Gilles H. Timmermans ◽  
Michael G. Debije ◽  
Albertus P. H. J. Schenning
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystal ◽  
Crosslink Density ◽  
Nematic Liquid Crystals ◽  
Polymer Network ◽  
Thermally Responsive ◽  
Chiral Nematic ◽  
Polymer Stabilized

An adjustable broadband reflector based on a polymer stabilized chiral nematic liquid crystal has been fabricated.

scholarly journals Impact of Dispersion of Nanoscale Particles on the Properties of Nematic Liquid Crystals

Crystals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 475 ◽  
Author(s):  
Singh
Keyword(s):  
Quantum Dots ◽  
Liquid Crystals ◽  
Recent Progress ◽  
Nematic Liquid Crystals ◽  
Spectroscopic Properties ◽  
Host Matrix ◽  
Nanoscale Particles ◽  
Composite Systems ◽  
Made In

This work reviews the recent progress made in last decade in understanding the role of dispersion ofnanoparticles and quantum dots into host nematic liquid crystals. There are two important ingredients of this work: Even a minute concentration of these non-mesogenic materials in host matrix can have reflective impact on the dielectric, electro-optical, and spectroscopic properties of host nematics and the nematic-nanoparticles composite systems become suitable for the use in nematic based display and other devices.

Role of miRNA in circadian rhythmicity: recent progress

2011 ◽  
Vol 31 (10) ◽  
pp. 1137-1139
Author(s):  
Qing-min WANG ◽  
Hui WAN ◽  
Fen-zhou SHI ◽  
Jun SHEN ◽  
Qiu-hong LIU
Keyword(s):  
Recent Progress ◽  
Circadian Rhythmicity

Recent Progress in the Therapeutic Role of Serelaxin in Vascular Dysfunction

2018 ◽  
Vol 19 (11) ◽  
pp. 1079-1087 ◽  
Author(s):  
Ghulam Murtaza ◽  
Adeel Siddiqui ◽  
Izhar Hussain
Keyword(s):  
Recent Progress ◽  
Vascular Dysfunction ◽  
Therapeutic Role

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,...

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