A combined experimental and theoretical approach to study SmC → NcybC phase transition in a four-ring bent-core liquid crystal

2016 ◽  
Vol 40 (8) ◽  
pp. 6834-6847 ◽  
Author(s):  
Swapnil Singh ◽  
Rahul Deb ◽  
Nirmalangshu Chakraborty ◽  
Harshita Singh ◽  
Vineet Gupta ◽  
...  
Keyword(s):  
Phase Transition ◽  
Hydrogen Bonding ◽  
Liquid Crystal ◽  
Theoretical Approach

Spectroscopic evidences for the analysis of phase transition and hydrogen bonding in a newly synthesised four-ring bent-core liquid crystal.

Study of Cr → SmA phase transition and hydrogen bonding in four-ring bent-core liquid crystal

2017 ◽  
Vol 178 ◽  
pp. 142-150 ◽  
Author(s):  
Swapnil Singh ◽  
Harshita Singh ◽  
Poonam Tandon ◽  
Nirmalangshu Chakraborty ◽  
N.V.S. Rao ◽  
...  
Keyword(s):  
Phase Transition ◽  
Hydrogen Bonding ◽  
Liquid Crystal

scholarly journals Short to long range order:Phase transition of one liquid crystal molecule at HP

2014 ◽  
Vol 70 (a1) ◽  
pp. C1475-C1475
Author(s):  
Jey Jau Lee ◽  
Ching-Che Kao
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Hydrogen Bonding ◽  
Liquid Crystal ◽  
Long Range ◽  
Lamellar Structure ◽  
Hydrophobic Interactions ◽  
Amide Group ◽  
Range Order ◽  
Long Range Order

We present the high pressure phase transition behavior of a gold(I) –NHCs complex, in which the NHCs include one long N-alkyl substituent and one N-acetamido group, The amide group is an excellent hydrogen bonding motif to provide interaction force between molecule. The gold (I) – NHC series form metallogel in DMSO at room temperature. PXRD studies show that self-assembly of [Au(C16,amide-imy)2 ][NO3] forms a lamellar structure with tubular architecture around the metal ion head core. Through Coulombic, hydrogen bonding, and hydrophobic interactions between solvent and the amide group under ambient environment. In the high pressure PXRD experiment of [Au(C16,amide-imy)2][NO3] complex , the lamellar structure phase become less and less , but the long range order behavior start to reveal by bragg's Debye ring grown up in the 2-D diffraction pattern when the pressure increased, As pressure up to 2GPa, The indexing shown the long range order with 3-D symmetry by monoclinic Laue symmetry. This is the first example that phase transition from lyotropic liquid crystal gel phase to long range order solid phase. The inter-molecule interaction and structure will be presented in this report.

Reversible microscale assembly of nanoparticles driven by the phase transition of a thermotropic liquid crystal

2017 ◽  
Author(s):  
Niamh Mac Fhionnlaoich ◽  
Stephen Schrettl ◽  
Nicholas B. Tito ◽  
Ye Yang ◽  
Malavika Nair ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Nematic Phase ◽  
Hierarchical Control ◽  
Building Blocks ◽  
Model System ◽  
Microscopic Level ◽  
Reversible Process ◽  
Thermotropic Liquid Crystal

The arrangement of nanoscale building blocks into patterns with microscale periodicity is challenging to achieve via self-assembly processes. Here, we report on the phase transition-driven collective assembly of gold nanoparticles in a thermotropic liquid crystal. A temperature-induced transition from the isotropic to the nematic phase leads to the assembly of individual nanometre-sized particles into arrays of micrometre-sized aggregates, whose size and characteristic spacing can be tuned by varying the cooling rate. This fully reversible process offers hierarchical control over structural order on the molecular, nanoscopic, and microscopic level and is an interesting model system for the programmable patterning of nanocomposites with access to micrometre-sized periodicities.

Competing hydrogen-bonding interactions in a high-Tc organic molecular-ionic crystal with evident nonlinear optical response

CrystEngComm ◽  
2021 ◽  
Vol 23 (13) ◽  
pp. 2509-2512
Author(s):  
Wen-Tao Xu ◽  
Jun-Chao Liu ◽  
Yu-Ling Zeng ◽  
Hua Zhang ◽  
Zhong-Xia Wang
Keyword(s):  
Phase Transition ◽  
Hydrogen Bonding ◽  
Ionic Crystal ◽  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
High Tc ◽  
Hydrogen Bonding Interactions ◽  
Nlo Response

An organic molecular-ionic crystal of (TPPO–H)2SO4 exhibits moderate NLO response which is twice that of KDP and competing hydrogen-bonding interactions triggered high-Tc phase transition.

Characterization of some mesogenic alkyl 1-thioglycosides

2002 ◽  
Vol 80 (8) ◽  
pp. 1162-1165 ◽  
Author(s):  
B Henrissat ◽  
G K Hamer ◽  
M G Taylor ◽  
R H Marchessault
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Solid State ◽  
Solid State Nmr ◽  
Liquid Crystalline ◽  
Liquid Crystal Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Liquid Crystalline Phases

A series of dodecyl 1-thio-β-D-glycosides has been synthesized and characterized (DSC, NMR, CP MAS, X-ray diffraction) as possible new marking materials with liquid-crystalline properties. These compounds undergo solid to liquid crystal phase transitions at various temperatures, which depend on the nature of the carbohydrate part of the structure. Their liquid-crystalline phases show extreme shear thinning behaviour.Key words: liquid crystal, powder X-ray diffraction, phase transition, thioglycoside, solid-state NMR, marking material

Phase Transition Detection in Liquid Crystal Analysis By Mathematical Morphology

2021 ◽  
pp. 117015
Author(s):  
A. Farinha ◽  
F.C. Flores ◽  
A.R. Sampaio ◽  
N.M. Kimura ◽  
F.C.M. Freire
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Mathematical Morphology

Nematic-nematic phase transition in the liquid crystal dimer CBC9CB and its mixtures with 5CB: A high-resolution adiabatic scanning calorimetric study

2011 ◽  
Vol 84 (4) ◽  
Author(s):  
Chandra Shekhar Pati Tripathi ◽  
Patricia Losada-Pérez ◽  
Christ Glorieux ◽  
Alexandra Kohlmeier ◽  
Maria-Gabriela Tamba ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
High Resolution ◽  
Nematic Phase ◽  
Calorimetric Study
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