Soft Magnets from the Self-Organization of Magnetic Nanoparticles in Twisted Liquid Crystals

2014 ◽  
Vol 126 (46) ◽  
pp. 12654-12658 ◽  
Author(s):  
Benjamin Matt ◽  
Kirsten M. Pondman ◽  
Sarah J. Asshoff ◽  
Bennie ten Haken ◽  
Benoit Fleury ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Magnetic Nanoparticles ◽  
The Self ◽  
Self Organization ◽  
Soft Magnets

Soft Magnets from the Self-Organization of Magnetic Nanoparticles in Twisted Liquid Crystals

2014 ◽  
pp. n/a-n/a ◽  
Author(s):  
Benjamin Matt ◽  
Kirsten M. Pondman ◽  
Sarah J. Asshoff ◽  
Bennie ten Haken ◽  
Benoit Fleury ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Magnetic Nanoparticles ◽  
The Self ◽  
Self Organization ◽  
Soft Magnets

Liquid Crystal Nanoparticles- LCNANOP: A SONSII Collaborative Research Project

2008 ◽  
Vol 1134 ◽  
Author(s):  
John William Goodby ◽  
Martin Bates ◽  
Isabel Saez ◽  
Ewa Gorecka ◽  
Heinz Kitzerow ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Collaborative Research ◽  
Chemical Properties ◽  
Hierarchical Structures ◽  
The Self ◽  
Nano Particles ◽  
Self Organization ◽  
Nano Particle ◽  
Research Project

AbstractLC-NANOP is an ESF EUROCORES SONS Collaborative Research Project that is addressing an innovative approach to self-organized nanostructures by combination of a variety of organic, inorganic and metal scaffolds with the unique self-organization properties of liquid crystals to obtain liquid crystal nano-particles. LC-NANOP is concerned with the synthesis, analysis, characterization, modeling and physico-chemical properties of super- and supra-molecular systems which are formed from a nano-particle as a central scaffold, surrounded by a layer of liquid crystal. The self-organization properties of the liquid crystal coating is the driving force leading to the self-assembly of the nano-particles into secondary or tertiary hierarchical structures, with emphasis on the systematic variation of nano-particle size, chirality, shape and functionality. This bottom-up approach to nano-structuring is very powerful as it combines the extraordinary variety of morphologies that liquid crystals present with the combination of functional entities, relevant for chemical, biological, optoelectronic, and photonic tasks, etc, to create ordered nano-structures that can be controlled by external stimuli.

scholarly journals Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal

2021 ◽  
Vol 11 (11) ◽  
pp. 5285
Author(s):  
Marcel G. Clerc ◽  
Gregorio González-Cortés ◽  
Paulina I. Hidalgo ◽  
Lucciano A. Letelier ◽  
Mauricio J. Morel ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Phase Modulation ◽  
Order Parameter ◽  
Liquid Crystal Cell ◽  
The Self ◽  
Self Organization ◽  
Experimental Setup ◽  
Coherent Beams ◽  
Light Beams

The use of dye-doped liquid crystals allows the amplification of the coupling of light and liquid crystals. Light can induce the self-organization of the molecular order. The appearance of ring patterns has been observed, which has been associated with phase modulation. However, the morphology and dynamics of the ring patterns are not consistent with self-modulation. Based on an experimental setup with two parallel coherence beams orthogonal to a liquid crystal cell, one of which induces photo-isomerization and the other causes illumination, the formation of ring patterns is studied. To use these two coherent beams, we synthesize methylred methyl ester as a dye-dopant, which is photosensitive only to one of the light beams, and a commercial E7 liquid crystal as a matrix. Based on a mathematical model that accounts for the coupling between the concentration of the cis-state and the order parameter, we elucidate the emergence of the rings as forming patterns in an inhomogeneous medium. The bifurcation diagram is analytically characterized. The emergence, propagation of the rings, and the establishment of the ring patterns are in fair agreement with the experimental observations.

Self-Organization of Nanoscopic Building Blocks into Ordered Assemblies

2004 ◽  
Vol 818 ◽  
Author(s):  
Mark A. Horsch ◽  
Christopher R. Iacovella ◽  
Zhenli Zhang ◽  
Sharon C. Glotzer
Keyword(s):  
Computer Simulation ◽  
Liquid Crystals ◽  
Block Copolymers ◽  
Self Assembly ◽  
Building Blocks ◽  
The Self ◽  
Self Organization

AbstractWe studied the self-assembly of nanoscopic building blocks comprised of polymer-tethered nanoparticles using computer simulation and predict that these building blocks can assemble into mono- and multi-layer sheets and shells. The simulations further demonstrate that for some nanoparticle geometries and tethered nanoparticle topologies, ideas from block copolymers, surfactants and liquid crystals can be used to predict the ordered morphologies attained via self- assembly and that for specific cases the morphologies are consistent with Israelachvili packing rules.

scholarly journals Self-organization of an optomagnetic CoFe2O4–ZnS nanocomposite: preparation and characterization

2015 ◽  
Vol 3 (16) ◽  
pp. 3935-3945 ◽  
Author(s):  
Ali Amiri Zarandi ◽  
Ali A. Sabbagh Alvani ◽  
Reza Salimi ◽  
Hassan Sameie ◽  
Shima Moosakhani ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Magnetic Nanoparticles ◽  
Saturation Magnetization ◽  
The Self ◽  
Self Organization ◽  
Advanced Method ◽  
Luminescence Characteristics

We report an advanced method for the self-organization of an optomagnetic nanocomposite composed of both fluorescent ZnS quantum dots and CoFe2O4 magnetic nanoparticles with acceptable saturation magnetization and satisfactory luminescence characteristics.

scholarly journals Influence of Salt on the Self-Organization in Solutions of Star-Shaped Poly-2-alkyl-2-oxazoline and Poly-2-alkyl-2-oxazine on Heating

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1152
Author(s):  
Tatyana Kirila ◽  
Anna Smirnova ◽  
Alla Razina ◽  
Andrey Tenkovtsev ◽  
Alexander Filippov
Keyword(s):  
Phase Separation ◽  
Salt Concentration ◽  
Monomer Unit ◽  
Salt Content ◽  
The Self ◽  
Self Organization ◽  
Phase Separation Temperature ◽  
The Core ◽  
Separation Temperature ◽  
Water Salt

The water–salt solutions of star-shaped six-arm poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines were studied by light scattering and turbidimetry. The core was hexaaza[26]orthoparacyclophane and the arms were poly-2-ethyl-2-oxazine, poly-2-isopropyl-2-oxazine, poly-2-ethyl-2-oxazoline, and poly-2-isopropyl-2-oxazoline. NaCl and N-methylpyridinium p-toluenesulfonate were used as salts. Their concentration varied from 0–0.154 M. On heating, a phase transition was observed in all studied solutions. It was found that the effect of salt on the thermosensitivity of the investigated stars depends on the structure of the salt and polymer and on the salt content in the solution. The phase separation temperature decreased with an increase in the hydrophobicity of the polymers, which is caused by both a growth of the side radical size and an elongation of the monomer unit. For NaCl solutions, the phase separation temperature monotonically decreased with growth of salt concentration. In solutions with methylpyridinium p-toluenesulfonate, the dependence of the phase separation temperature on the salt concentration was non-monotonic with minimum at salt concentration corresponding to one salt molecule per one arm of a polymer star. Poly-2-alkyl-2-oxazine and poly-2-alkyl-2-oxazoline stars with a hexaaza[26]orthoparacyclophane core are more sensitive to the presence of salt in solution than the similar stars with a calix[n]arene branching center.

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