What is Calamitic liquid crystal?
What is Calamitic liquid crystal?
Calamitic liquid crystals usually exhibit several mesophases: nematic, smectic, and cholesteric phases. Forming these liquid crystalline states enables these compounds to exhibit characteristic functions such as optical anisotropy and ferroelectricity.
What is a liquid crystal material?
Liquid crystals (LCs) are a state of matter which has properties between those of conventional liquids and those of solid crystals. For instance, a liquid crystal may flow like a liquid, but its molecules may be oriented in a crystal-like way. Within a domain, however, the molecules are well ordered.
What are the uses of liquid crystals?
Liquid crystals are everywhere. They are used in all kinds of display devices including computer monitors and laptop screens, TVs, clocks, visors, and navigation systems. Each pixel in a monitor is an assembly of liquid crystals controlled by its own electromagnetic field.
How liquid crystal are formed?
Liquid crystals are formed mostly by rod-like molecules. They are sometimes addressed as mesomorphic phases. Materials that can form such phases are called mesogens. An ordinary fluid is called isotropic, i.e., its properties are independent of direction.
What are the characteristics of liquid crystals?
Liquid crystal materials generally have several common characteristics. Among these are a rod-like molecular structure, rigidness of the long axis, and strong dipoles and/or easily polarizable substituents.
What is the director of a calamitic liquid crystal?
In calamitic liquid crystals the director is defined as being along the axis of the moment of inertia of the molecules. In nematic liquid crystals the director is perpendicular to the average plane of all the liquid crystals. In nematic discotics phases there is no positional order between the molecules, only orientational order.
Why do calamitic liquid crystals have a flexible tail?
These calamitic liquid crystals have a rigid polarizable core and have a flexible aliphatic tail on one of the sides. The cores makes them want to line up and be more crystalline, while the flexible tail lowers the degree of order so they can flow.
How are nematic liquid crystals different from calamitic liquid crystals?
There is a difference in the definition of the director between calamitic and nematic liquid crystals. In calamitic liquid crystals the director is defined as being along the axis of the moment of inertia of the molecules. In nematic liquid crystals the director is perpendicular to the average plane of all the liquid crystals.
Which is the best classification of liquid crystals?
Classification and Examples of Liquid Crystals 1 Classification of Liquid Crystals. Liquid crystals can be first organized into thermotropic (temperature dependent) and lyotropic (concentration dependent). 2 Calamitic Liquid Crystals. 3 Discotic Liquid Crystals. 4 Charge Transport in Liquid Crystals. 5 Summary of Phases and Order.