Long-range ordered graphite oxide liquid crystals

2014 ◽  
Vol 50 (58) ◽  
pp. 7776-7779 ◽  
Author(s):  
Liping Tong ◽  
Wei Qi ◽  
Mengfan Wang ◽  
Renliang Huang ◽  
Rongxin Su ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Long Range ◽  
Graphite Oxide ◽  
Liquid Crystallinity

Liquid crystallinity of graphite oxide prepared without the aid of sonication was observed, which exhibited a spontaneous highly-ordered alignment.

scholarly journals Tailored growth of graphene oxide liquid crystals with controlled polymer crystallization in GO-polymer composites

Nanoscale ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 2720-2727
Author(s):  
Soh Jin Mun ◽  
Yul Hui Shim ◽  
Geon Woong Kim ◽  
Sung Hwan Koo ◽  
Hyungju Ahn ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Liquid Crystals ◽  
Polymer Composites ◽  
Long Range ◽  
Polymer Crystallization ◽  
Liquid Crystallinity ◽  
Range Alignment ◽  
Kinetics Of

Kinetics of polymer crystallization determines the liquid crystallinity of graphene oxide and its long range alignment.

Reversibly photoswitchable alkoxy azobenzenes connected benzenetricarboxamide discotic liquid crystals with perpetual long range columnar assembly

2019 ◽  
Vol 17 (7) ◽  
pp. 1947-1954 ◽  
Author(s):  
Sudha Devi ◽  
Indu Bala ◽  
Santosh Prasad Gupta ◽  
Pravesh Kumar ◽  
Santanu Kumar Pal ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Long Range ◽  
Discotic Liquid Crystals

Reversibly photoswitchable discotic liquid crystals (DLCs) with no change in columnar assembly.

scholarly journals Lyotropic liquid crystals and linear supramolecular polymers of end-functionalized oligosaccharides

2019 ◽  
Vol 55 (78) ◽  
pp. 11739-11742 ◽  
Author(s):  
Teemu T. T. Myllymäki ◽  
Aynur Guliyeva ◽  
Antti Korpi ◽  
Mauri A. Kostiainen ◽  
Ville Hynninen ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Lyotropic Liquid Crystals ◽  
Supramolecular Polymers ◽  
Liquid Crystallinity

Lyotropic liquid crystallinity and fibers were observed from linear supramolecular polysaccharides consisting in permethylated maltoheptaose both end-functionalized with UPy stickers.

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.

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