Comment on ‘‘Quadrupolar glass freezing in solid hydrogen: Distribution functions for the orientational order parameters’’

1995 ◽  
Vol 51 (6) ◽  
pp. 3965-3965
Author(s):  
K. Walasek
Keyword(s):  
Orientational Order ◽  
Solid Hydrogen ◽  
Order Parameters ◽  
Distribution Functions ◽  
Hydrogen Distribution ◽  
Quadrupolar Glass

scholarly journals Order parameters, orientational distribution functions and heliconical tilt angles of oligomeric liquid crystals

2019 ◽  
Vol 21 (13) ◽  
pp. 6839-6843 ◽  
Author(s):  
Richard J. Mandle ◽  
John W. Goodby
Keyword(s):  
Liquid Crystals ◽  
Orientational Order ◽  
Helical Structure ◽  
Order Parameters ◽  
Distribution Functions ◽  
X Ray ◽  
X Ray Scattering ◽  
Orientational Distribution ◽  
Pitch Length ◽  
Ray Scattering

Twist-bend (TB) phases possess a local helical structure with a pitch length of a few nanometers. X-ray scattering experiments on aligned samples of dimeric and oligomeric materials allows the orientational order parameters, orientational distribution functions and heliconical tilt angles to be calculated.

scholarly journals Liquid Crystal Ordering in the Hexagonal Phase of Rod-Coil Diblock Copolymers

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1262
Author(s):  
Mikhail A. Osipov ◽  
Maxim V. Gorkunov ◽  
Alexander A. Antonov
Keyword(s):  
Liquid Crystal ◽  
Order Parameter ◽  
Density Functional ◽  
Diblock Copolymers ◽  
Microphase Separation ◽  
Hexagonal Phase ◽  
Orientational Order ◽  
Order Parameters ◽  
Copolymer Composition ◽  
Rigid Rod

Density functional theory of rod-coil diblock copolymers, developed recently by the authors, has been generalised and used to study the liquid crystal ordering and microphase separation effects in the hexagonal, lamellar and nematic phases. The translational order parameters of rod and coil monomers and the orientational order parameters of rod-like fragments of the copolymer chains have been determined numerically by direct minimization of the free energy. The phase diagram has been derived containing the isotropic, the lamellar and the hexagonal phases which is consistent with typical experimental data. The order parameter profiles as functions of temperature and the copolymer composition have also been determined in different anisotropic phases. Finally, the spatial distributions of the density of rigid rod fragments and of the corresponding orientational order parameter in the hexagonal phase have been calculated.

Magnetoviscosity and orientational order parameters of dilute ferrofluids

2002 ◽  
Vol 116 (20) ◽  
pp. 9078-9088 ◽  
Author(s):  
Patrick Ilg ◽  
Martin Kröger ◽  
Siegfried Hess
Keyword(s):  
Orientational Order ◽  
Order Parameters

Orientational order parameters of nematogenic trans-4-propyl cyclohexyl-4 (trans-4-alkyl cyclohexyl) benzoates

Pramana ◽  
1982 ◽  
Vol 19 (4) ◽  
pp. 349-355 ◽  
Author(s):  
Srinivasa ◽  
M M M Abdoh ◽  
N C Shivaprakash ◽  
J Shashi-Dhara Prasad
Keyword(s):  
Orientational Order ◽  
Order Parameters

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.

Comparison of the orientational order parameters determined from X-ray diffraction and13C NMR studies of a hockey stick-shaped compound

2009 ◽  
Vol 82 (6) ◽  
pp. 433-443 ◽  
Author(s):  
Gautam Sarkar ◽  
Malay Kumar Das ◽  
Ranjit Paul ◽  
Banani Das ◽  
Wolfgang Weissflog
Keyword(s):  
Orientational Order ◽  
Order Parameters ◽  
X Ray Diffraction ◽  
Nmr Studies ◽  
Hockey Stick ◽  
X Ray

Calculation of the order parameter of solid hydrogen in the quadrupolar-glass phase

1994 ◽  
Vol 49 (14) ◽  
pp. 9460-9468 ◽  
Author(s):  
K. Walasek ◽  
K. Lukierska-Walasek
Keyword(s):  
Order Parameter ◽  
Glass Phase ◽  
Solid Hydrogen ◽  
Quadrupolar Glass
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