Explain difference between three liquid crystals w.r.t the order in arrangement of molecules with the help of diagram. Which property of liquid crystal is used for display?

58views

written 3.3 years ago by

Nematic Phases	Smectic Phases	Cholesteric Phases
In a nematic phase, the calamitic or rod-shaped organic molecules have no positional order, but they self-align to have long-range directional order with their long axes roughly parallel	In the smectic state, the molecules maintain the general orientational order of nematics, but also tend to align themselves in layers or planes	Columnar liquid crystals are shaped like disks instead of long rods. This mesophase is characterized by stacked columns of molecules. The columns are packed together to form a two-dimensional crystalline array. The arrangement of the molecules within the columns and the arrangement of the columns themselves lead to new mesophases
Molecules in this phase do not show a degree of translational order	Molecules in this phase show a degree of translational order	Molecules in this phase do not show a degree of translational order
They are found at lower temperature	They are found at higher temperature	They are found at lower temperature
Nematic columnar liquid crystals have no long-range order and are less organized	They are randomly oriented.	Columnar phases with long-range order are classiﬁed by their two-dimensional
Lattices: Hexagonal, tetragonal, rectangular, and oblique phases.

ADD COMMENT EDIT