scholarly journals Oriented Gold Nanorods and Gold Nanorod Chains within Smectic Liquid Crystal Topological Defects

ACS Nano ◽  
2017 ◽  
Vol 11 (7) ◽  
pp. 6728-6738 ◽  
Author(s):  
Brigita Rožič ◽  
Jérôme Fresnais ◽  
Celine Molinaro ◽  
Joseph Calixte ◽  
Shivakumar Umadevi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Gold Nanorods ◽  
Topological Defects ◽  
Gold Nanorod ◽  
Smectic Liquid Crystal

scholarly journals Topological Defect-Guided Regular Stacking of Focal Conic Domains in Hybrid-Aligned Smectic Liquid Crystal Shells

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 913
Author(s):  
JungHyun Noh ◽  
Jan P. F. Lagerwall
Keyword(s):  
Liquid Crystal ◽  
Topological Defects ◽  
Solid Particles ◽  
Aqueous Interfaces ◽  
Smectic Liquid Crystal ◽  
Self Organized ◽  
Local Reduction ◽  
Spherical Topology ◽  
Hybrid Configuration ◽  
Reduced Density

We study liquid crystal (LC) shells in hybrid configuration (director tangential to the inside but normal to the outside) as they slowly undergo a transition from a nematic (N) to a smectic-A (SmA) phase. Every shell has two antipodal +1 topological defects, at the thinnest and thickest points, respectively. On cooling from N to SmA, the symmetry axis connecting the defects gradually reorients from along gravity to perpendicular to it, reversibly and continuously, if the LC and aqueous phase are density matched at the N-SmA transition. This suggests reduced density near the defects—reflecting a local reduction in order—under the strong confinement with antagonistic boundary conditions. In the SmA phase, a regular array of focal conic domains (FCDs) develops, templated in position and orientation by the +1 defect at the thinnest point. Around this defect, a single complete toroidal FCD always develops, surrounded by incomplete FCDs. In contrast to similar FCD arrangements on flat aqueous interfaces, this is a stable situation, since the two +1 defects are required by the spherical topology. Our results demonstrate how the topological defects of LC shells can be used to template complex self-organized structures. With a suitable adaption of the LC chemistry, shells might serve as a basis for producing solid particles with complex yet highly regular morphologies.

scholarly journals Effective replacement of cetyltrimethylammonium bromide (CTAB) by mercaptoalkanoic acids on gold nanorod (AuNR) surfaces in aqueous solutions

Nanoscale ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 658-668 ◽  
Author(s):  
Rafael del Caño ◽  
Jose M. Gisbert-González ◽  
Jose González-Rodríguez ◽  
Guadalupe Sánchez-Obrero ◽  
Rafael Madueño ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Gold Nanorods ◽  
Ligand Exchange ◽  
Cetyltrimethylammonium Bromide ◽  
Gold Nanorod ◽  
Experimental Conditions ◽  
Seed Mediated ◽  
The Stability

The highly packed cetyltrimethylammonium bromide bilayer on the surface of gold nanorods synthesized by the seed-mediated procedure hampers the complete ligand exchange under experimental conditions that preserves the stability of the dispersions.

Electromechanical Vibration Study in Freely Suspended Smectic Liquid Crystal

2000 ◽  
Vol 347 (1) ◽  
pp. 111-120
Author(s):  
Toshiyasu Oue ◽  
Hidetaka Nambu ◽  
Keizo Nakayama ◽  
Masanori Ozaki ◽  
Katsumi Yoshino ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Smectic Liquid Crystal ◽  
Freely Suspended

A new pathway for the formation of radial nematic droplets within a lipid-laden aqueous-liquid crystal interface

RSC Advances ◽  
2014 ◽  
Vol 4 (36) ◽  
pp. 18889-18893 ◽  
Author(s):  
Sumyra Sidiq ◽  
Dibyendu Das ◽  
Santanu Kumar Pal
Keyword(s):  
Liquid Crystal ◽  
Topological Defects ◽  
Soft Materials ◽  
Stimuli Responsive ◽  
First Time ◽  
Crystal Interface

A new pathway for the formation of liquid crystal (LC) droplets with radial LC ordering is reported for the first time in the presence of surfactants and lipids. Interactions of an enzyme with the topological defects in the LC mediate the response of these droplets and thus provide new designs for stimuli-responsive soft materials.

scholarly journals Hydrogen-bonded silica gels dispersed in a smectic liquid crystal: A random fieldXYsystem

2002 ◽  
Vol 65 (5) ◽  
Author(s):  
S. Park ◽  
R. L. Leheny ◽  
R. J. Birgeneau ◽  
J.-L. Gallani ◽  
C. W. Garland ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Silica Gels ◽  
Smectic Liquid Crystal ◽  
Hydrogen Bonded

scholarly journals Liquid crystal display modes in a nontilted bent-core biaxial smectic liquid crystal

2010 ◽  
Vol 97 (21) ◽  
pp. 213505 ◽  
Author(s):  
Mamatha Nagaraj ◽  
Y. P. Panarin ◽  
J. K. Vij ◽  
C. Keith ◽  
C. Tschierske
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Smectic Liquid Crystal
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