Vapor deposition of a smectic liquid crystal: highly anisotropic, homogeneous glasses with tunable molecular orientation

Soft Matter ◽  
2016 ◽  
Vol 12 (11) ◽  
pp. 2942-2947 ◽  
Author(s):  
Jaritza Gómez ◽  
Jing Jiang ◽  
Ankit Gujral ◽  
Chengbin Huang ◽  
Lian Yu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Vapor Deposition ◽  
Molecular Orientation ◽  
Physical Vapor Deposition ◽  
Smectic A ◽  
Smectic Liquid Crystal

Physical vapor deposition (PVD) has been used to prepare glasses of itraconazole, a smectic A liquid crystal.

scholarly journals Vapor deposition of a nonmesogen prepares highly structured organic glasses

2019 ◽  
Vol 116 (43) ◽  
pp. 21421-21426 ◽  
Author(s):  
Camille Bishop ◽  
Jacob L. Thelen ◽  
Eliot Gann ◽  
Michael F. Toney ◽  
Lian Yu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
X Ray ◽  
Smectic Liquid Crystal ◽  
Nexafs Spectroscopy ◽  
X Ray Scattering ◽  
Organic Glasses ◽  
X Ray Absorption ◽  
Deposited Films

We show that glasses with aligned smectic liquid crystal-like order can be produced by physical vapor deposition of a molecule without any equilibrium liquid crystal phases. Smectic-like order in vapor-deposited films was characterized by wide-angle X-ray scattering. A surface equilibration mechanism predicts the highly smectic-like vapor-deposited structure to be a result of significant vertical anchoring at the surface of the equilibrium liquid, and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy orientation analysis confirms this prediction. Understanding of the mechanism enables informed engineering of different levels of smectic order in vapor-deposited glasses to suit various applications. The preparation of a glass with orientational and translational order from a nonliquid crystal opens up an exciting paradigm for accessing extreme anisotropy in glassy solids.

Optical activity and light scattering in the isotropic and smectic A* phases of a highly chiral smectic liquid crystal

1993 ◽  
Vol 14 (6) ◽  
pp. 1793-1800 ◽  
Author(s):  
Brian D. Yanoff ◽  
Andrew A. Ruether ◽  
Peter J. Collings ◽  
Andrew J. Slaney ◽  
John W. Goodby
Keyword(s):  
Liquid Crystal ◽  
Light Scattering ◽  
Optical Activity ◽  
Smectic A ◽  
Smectic Liquid Crystal

13C NMR Observation of Molecular Motions at the Smectic-A-Smectic-C (Smectic-C*) Transition in a Recemic (Chiral) Smectic Liquid Crystal

1990 ◽  
Vol 29 (Part 2, No. 7) ◽  
pp. L1153-L1156 ◽  
Author(s):  
Atsushi Yoshizawa ◽  
Hiroshi Kikuzaki ◽  
Toshihiro Hirai ◽  
Mamoru Yamane
Keyword(s):  
Liquid Crystal ◽  
13C Nmr ◽  
Molecular Motions ◽  
Smectic A ◽  
Smectic C ◽  
Smectic Liquid Crystal

scholarly journals Inherent structure energy is a good indicator of molecular mobility in glasses

Soft Matter ◽  
2016 ◽  
Vol 12 (27) ◽  
pp. 5898-5904 ◽  
Author(s):  
Julian Helfferich ◽  
Ivan Lyubimov ◽  
Daniel Reid ◽  
Juan J. de Pablo
Keyword(s):  
Molecular Mobility ◽  
Vapor Deposition ◽  
Molecular Orientation ◽  
Physical Vapor Deposition ◽  
Kinetic Stability ◽  
Slow Dynamics ◽  
Liquid Cooling ◽  
Inherent Structure

Glasses produced via physical vapor deposition can display greater kinetic stability and lower enthalpy than glasses prepared by liquid cooling. We show that the inherent structure energy is a good indicator for the slow dynamics in these glasses regardless of molecular orientation.

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