Synthesis of new U-shaped azobenzene liquid crystals for photoswitching properties

RSC Advances ◽  
2015 ◽  
Vol 5 (106) ◽  
pp. 87019-87029 ◽  
Author(s):  
Md Lutfor Rahman ◽  
Shaheen M. Sarkar ◽  
Mashitah M. Yusoff ◽  
Sandeep Kumar ◽  
Carsten Tschierske
Keyword(s):  
Liquid Crystals ◽  
Optical Storage ◽  
Isotropic Phase ◽  
Storage Devices ◽  
Green Area ◽  
Gray Circle

New U-shaped azobenzene liquid crystals can be used for creation of optical storage devices. Gray circle in the middle is the UV irradiated area to form disordered isotropic phase whereas blue-green area is protected from the light by mask remains.

Synthesis and photoswitching properties of liquid crystals derived from myo-inositol

RSC Advances ◽  
2014 ◽  
Vol 4 (66) ◽  
pp. 35089-35098 ◽  
Author(s):  
Md Lutfor Rahman ◽  
Mashitah Mohd Yusoff ◽  
Sandeep Kumar
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Optical Storage ◽  
Isotropic Phase ◽  
Storage Devices ◽  
The Creation ◽  
Bright Area

A new myo-inositol-based liquid crystal can be used for the creation of optical storage devices. The dark area is the UV-irradiated area forming a disordered isotropic phase, whereas the bright area protected from the light by using a mask remains in the ordered phase.

Effective tuning of optical storage devices using photosensitive bent-core liquid crystals

2020 ◽  
Vol 304 ◽  
pp. 112719 ◽  
Author(s):  
B.N. Sunil ◽  
M.K. Srinatha ◽  
G. Shanker ◽  
Gurumurthy Hegde ◽  
M. Alaasar ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Optical Storage ◽  
Storage Devices

Light shutters and electro-optical storage devices from antiferroelectric liquid crystals of bent-shape molecules

2003 ◽  
Author(s):  
Antal Jakli ◽  
Liang-Chi Chien ◽  
Daniel Kruerke ◽  
Sebastian Rauch ◽  
Hans Sawade ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Optical Storage ◽  
Storage Devices ◽  
Antiferroelectric Liquid Crystals

HIGH RESOLUTION CALORIMETRIC STUDIES AT PHASE TRANSITIONS OF ALKYLCYANOBIPHENYL LIQUID CRYSTALS CONFINED TO SUBMICRON SIZE CYLINDRICAL CAVITIES

1995 ◽  
Vol 09 (18n19) ◽  
pp. 2247-2283 ◽  
Author(s):  
DANIELE FINOTELLO ◽  
GERMANO S. IANNACCHIONE
Keyword(s):  
Phase Transitions ◽  
Liquid Crystals ◽  
High Resolution ◽  
Specific Heat ◽  
Pore Wall ◽  
Isotropic Phase ◽  
First Order ◽  
Smectic A ◽  
Nematic Director ◽  
Scalar Order Parameter

We review results of a high resolution systematic study of the specific heat for alkyl-cyanobiphenyl liquid crystals confined to the 0.2µm diameter cylindrical pores Anopore membranes. The nematic director alignment at the pore wall is varied from homeotropic to tangential by pore surface treatment. Several phenomena are uncovered by these studies which probed the weakly first order nematic to isotropic, the continuous smectic-A to nematic and the first order smectic-A to isotropic phase transitions. The specific heat is strongly dependent on the nematic director configuration, and confinement effects are remarkably distinct according to the order of the phase transition. The influence of elastic distortions and surface ordering and disordering effects are evident. Despite considerable departures from bulk behavior with regards to specific heat peaks size, rounding and width, and transition temperature shifts, a bulk-like critical behavior appears to be retained. The formation of smectic translational order within the pores is hindered for those liquid crystals that also possess a nematic phase. The average scalar order parameter temperature dependence is extracted from the specific heat results using a simplified Landau-de Gennes type of model, and is shown to be consistent with nuclear magnetic resonance results.

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