Effect of gelation on the Frank elastic constants in a liquid crystalline mixture exhibiting a twist bend nematic phase

Soft Matter ◽  
2019 ◽  
Vol 15 (48) ◽  
pp. 9982-9990 ◽  
Author(s):  
Vimala Sridurai ◽  
Madhu B. Kanakala ◽  
C. V. Yelamaggad ◽  
Geetha G. Nair
Keyword(s):  
Elastic Constants ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Crystalline Mixture ◽  
Gel Network

The random gel network fibers formed in the nematic phase develop into directional microstructures in the twist bend nematic.

scholarly journals Pretransitional behavior of viscoelastic parameters at the nematic to twist-bend nematic phase transition in flexible n-mers

2019 ◽  
Vol 21 (24) ◽  
pp. 13078-13089 ◽  
Author(s):  
Zeinab Parsouzi ◽  
Greta Babakhanova ◽  
Mojtaba Rajabi ◽  
Rony Saha ◽  
Prabesh Gyawali ◽  
...  
Keyword(s):  
Phase Transition ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Elastic Constants ◽  
Homologous Series ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Viscoelastic Parameters ◽  
Scattering Measurements

We report dynamic light scattering measurements of the orientational (Frank) elastic constants and associated viscosities among a homologous series of a liquid crystalline dimer, trimer, and tetramer exhibiting a uniaxial nematic (N) to twist-bend nematic (NTB) phase transition.

Hydrogen bonding liquid crystalline benzoic acids with alkylthio groups: phase transition behavior and insights into the cybotactic nematic phase

2017 ◽  
Vol 41 (14) ◽  
pp. 6514-6522 ◽  
Author(s):  
Yuki Arakawa ◽  
Yukito Sasaki ◽  
Kazunobu Igawa ◽  
Hideto Tsuji
Keyword(s):  
Phase Transition ◽  
Hydrogen Bonding ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Benzoic Acids ◽  
Phase Transition Behavior ◽  
Transition Behavior

A novel class of hydrogen bonding liquid crystalline benzoic acids with alkylthio groups was established and their phase transition behavior was investigated in detail.

scholarly journals Order Parameters, Orientational Distribution Functions and Heliconical Tilt Angles of Oligomeric Liquid Crystals

2019 ◽  
Author(s):  
Richard Mandle ◽  
John W. Goodby
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Tilt Angle ◽  
Order Parameter ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Thermal Evolution ◽  
Order Parameters ◽  
Distribution Functions ◽  
Orientational Distribution

We compare the order parameters, orientational distribution functions (ODF) and heliconical tilt angles of the TB phase exhibited by a liquid-crystalline dimer (CB7CB) to a tetramer (O47) and hexamer (O67) by SAXS/WAXS. Following the N-TB phase transition we find that all order parameters decrease, and while 〈P2 〉 remains positive 〈P4 〉 becomes negative. For all three materials the order parameter 〈P6 〉 is near zero in both phases. The ODF is sugarloaf-like in the nematic phase and volcano-like in the TB phase, allowing us to estimate the heliconical tilt angle of each material and its thermal evolution. The heliconical tilt angle appears to be largely independent of the material studied despite the differing number of mesogenic units.

Helical twisting power and compatibility in twisted nematic phase of new chiral liquid crystalline dopants with various liquid crystalline matrices

2019 ◽  
Vol 46 (12) ◽  
pp. 1769-1779 ◽  
Author(s):  
Łukasz Duda ◽  
Maciej Czajkowski ◽  
Bartłomiej Potaniec ◽  
Petra Vaňkátová
Keyword(s):  
Nematic Phase ◽  
Liquid Crystalline ◽  
Twisted Nematic ◽  
Helical Twisting Power
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