Smectic monolayer confined on a sphere: topology at the particle scale

Soft Matter ◽  
2017 ◽  
Vol 13 (44) ◽  
pp. 8120-8135 ◽  
Author(s):  
Elshad Allahyarov ◽  
Axel Voigt ◽  
Hartmut Löwen
Keyword(s):  
Spherical Surface ◽  
Topological Defects ◽  
Packing Fraction ◽  
Smectic Layer ◽  
Hard Spherocylinders

High packing fraction smectic layer of hard spherocylinders with isotropic caps on a spherical surface. This structure is stable and free from topological defects.

scholarly journals Length segregation in mixtures of spherocylinders induced by imposed topological defects

Soft Matter ◽  
2018 ◽  
Vol 14 (44) ◽  
pp. 8962-8973 ◽  
Author(s):  
Elshad Allahyarov ◽  
Hartmut Löwen
Keyword(s):  
Binary Mixtures ◽  
Spherical Surface ◽  
Topological Defects

We explore length segregation in binary mixtures of spherocylinders of lengths L1 and L2 which are tangentially confined on a spherical surface of radius R.

scholarly journals Topological defects in nematic droplets of hard spherocylinders

2000 ◽  
Vol 62 (4) ◽  
pp. 5081-5091 ◽  
Author(s):  
Joachim Dzubiella ◽  
Matthias Schmidt ◽  
Hartmut Löwen
Keyword(s):  
Topological Defects ◽  
Hard Spherocylinders

Topological defects of tetratic liquid-crystal order on a soft spherical surface

Soft Matter ◽  
2013 ◽  
Vol 9 (48) ◽  
pp. 11461 ◽  
Author(s):  
Yao Li ◽  
Han Miao ◽  
Hongru Ma ◽  
Jeff Z. Y. Chen
Keyword(s):  
Liquid Crystal ◽  
Spherical Surface ◽  
Topological Defects

scholarly journals ZnO1−xSxNanosphere in Ferroelectric Liquid Crystal Matrix: The Effect of Aggregation and Defects on the Dielectric and Electro-Optical Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Dharmendra Pratap Singh ◽  
Swadesh Kumar Gupta ◽  
Rajiv Manohar
Keyword(s):  
Liquid Crystal ◽  
Dopant Concentration ◽  
Topological Defects ◽  
Localized Surface Plasmon ◽  
Smectic Layer ◽  
Ferroelectric Liquid Crystal ◽  
High Concentration ◽  
Crystal Matrix ◽  
Liquid Crystal Matrix ◽  
High Dopant Concentration

High concentration (5 wt %) ofZnO1−xSxnanosphere (NS) has been dispersed in the ferroelectric liquid crystal (FLC) to analyze the effect of high dopant concentration in the FLC matrix. The FLC molecules actively interact with the NS. The presence of NS enhances the photoluminescence of the pure FLC material due to the coupling of localized surface plasmon resonance from NS with FLC molecules. The high concentration of NS causes an aggregation in the FLC matrix and creates topological defects. The defects and aggregation cause the change in electro-optical and dielectric properties of the pure FLC material. The bigger size of NS as compared to the smectic layer separation causes the warping in the smectic layer. Semiconducting nature of NS also affects the conductivity of the pure FLC.

scholarly journals Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5717
Author(s):  
Vladimíra Novotná ◽  
Lubor Lejček ◽  
Věra Hamplová ◽  
Jana Vejpravová
Keyword(s):  
Liquid Crystals ◽  
Magnetic Nanoparticles ◽  
Hybrid System ◽  
Topological Defects ◽  
Elastic Interaction ◽  
Critical Dimension ◽  
Smectic Layer ◽  
Dislocation Loops ◽  
Smectic A ◽  
Linear Defects

Topological defects in anisotropic fluids like liquid crystals serve as a playground for the research of various effects. In this study, we concentrated on a hybrid system of chiral rod-like molecules doped by magnetic nanoparticles. In textures of the smectic A phase, we observed linear defects and found that clusters of nanoparticles promote nucleation of smectic layer defects just at the phase transition from the isotropic to the smectic A (SmA) phase. In different geometries, we studied and analysed creation of defects which can be explained by attractive elastic forces between nanoparticles in the SmA phase. On cooling the studied hybrid system, clusters grow up to the critical dimension, and the smectic texture is stabilised. The presented effects are theoretically described and explained if we consider the elastic interaction of two point defects and stabilisation of prismatic dislocation loops due to the presence of nanoparticles.

scholarly journals Topological defects of dipole patchy particles on a spherical surface

Soft Matter ◽  
2020 ◽  
Vol 16 (33) ◽  
pp. 7667-7675
Author(s):  
Uyen Tu Lieu ◽  
Natsuhiko Yoshinaga
Keyword(s):  
Spherical Surface ◽  
Orientational Order ◽  
Topological Defects ◽  
Patchy Particles

The interplay between the positional order and orientational order of dipole patchy particles on a sphere.

A Pseudo Five-Fold Symmetrical Ligand Drives Geometric Frustration in Porous Metal-Organic and Hydrogen Bonded Frameworks

2020 ◽  
Author(s):  
Frederik Haase ◽  
Gavin Craig ◽  
Mickaele Bonneau ◽  
kunihisa sugimoto ◽  
Shuhei Furukawa
Keyword(s):  
Topological Defects ◽  
Porous Metal ◽  
Building Blocks ◽  
Structural Features ◽  
Equilibrium Structure ◽  
Sorption Behavior ◽  
Building Unit ◽  
Geometric Frustration ◽  
Secondary Building Units ◽  
Hydrogen Bonded

Reticular framework materials thrive on designability, but unexpected reaction outcomes are crucial in exploring new structures and functionalities. By combining “incompatible” building blocks, we employed geometric frustration in reticular materials leading to emergent structural features. The combination of a pseudo C<sub>5</sub> symmetrical organic building unit based on a pyrrole core, with a C<sub>4</sub> symmetrical copper paddlewheel synthon led to three distinct frameworks by tuning the synthetic conditions. The frameworks show structural features typical for geometric frustration: self-limiting assembly, internally stressed equilibrium structures and topological defects in the equilibrium structure, which manifested in the formation of a hydrogen bonded framework, distorted and broken secondary building units and dangling functional groups, respectively. The influence of geometric frustration on the CO<sub>2</sub> sorption behavior and the discovery of a new secondary building unit shows geometric frustration can serve as a strategy to obtain highly complex porous frameworks.

A Pseudo Five-Fold Symmetrical Ligand Drives Geometric Frustration in Porous Metal-Organic and Hydrogen Bonded Frameworks

2020 ◽  
Author(s):  
Frederik Haase ◽  
Gavin Craig ◽  
Mickaele Bonneau ◽  
kunihisa sugimoto ◽  
Shuhei Furukawa
Keyword(s):  
Topological Defects ◽  
Porous Metal ◽  
Building Blocks ◽  
Structural Features ◽  
Equilibrium Structure ◽  
Sorption Behavior ◽  
Building Unit ◽  
Geometric Frustration ◽  
Secondary Building Units ◽  
Hydrogen Bonded

Reticular framework materials thrive on designability, but unexpected reaction outcomes are crucial in exploring new structures and functionalities. By combining “incompatible” building blocks, we employed geometric frustration in reticular materials leading to emergent structural features. The combination of a pseudo C<sub>5</sub> symmetrical organic building unit based on a pyrrole core, with a C<sub>4</sub> symmetrical copper paddlewheel synthon led to three distinct frameworks by tuning the synthetic conditions. The frameworks show structural features typical for geometric frustration: self-limiting assembly, internally stressed equilibrium structures and topological defects in the equilibrium structure, which manifested in the formation of a hydrogen bonded framework, distorted and broken secondary building units and dangling functional groups, respectively. The influence of geometric frustration on the CO<sub>2</sub> sorption behavior and the discovery of a new secondary building unit shows geometric frustration can serve as a strategy to obtain highly complex porous frameworks.

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