How are thermotropic liquid crystals formed?
Thermotropic liquid crystalline phases are formed by a change of temperature, whereas lyotropic phases are formed when mixed with aqueous phase. The phase transitions of thermotropic liquid crystal are temperature-dependent, while those of lyotropic liquid crystals depend on both temperature and concentration .
What is thermotropic liquid crystals?
Thermotropic liquid crystals (LC) are anisotropic liquids that possess a mesophase (a phase with crystal and liquid properties) within a certain temperature range. In a spectrometer magnet, LC molecules tend to orient to a common direction which defines the director of the liquid crystal.
What is cholesteric liquid crystal phase?
A cholesteric liquid crystal is a type of liquid crystal with a helical structure and which is therefore chiral. Cholesteric liquid crystals are also known as chiral nematic liquid crystals. They organize in layers with no positional ordering within layers, but a director axis which varies with layers.
How are liquid crystals classified?
Liquid crystals are classified in many ways, molecules within the mesophases (mesogens) can be calamitic (rod-like), discotic (disc-like), amphiphilic, nonamphiphilic, metal containing, non-metal containing and low molecular weight or polymeric.
What are liquid crystals discuss the structure of nematic smectic and cholesteric liquid crystals?
The key difference between nematic smectic and cholesteric liquid crystals is that nematic liquid crystals have no ordered structure of molecules, and smectic liquid crystals have a layered molecular structure, whereas cholesteric liquid crystals have molecules in a twisted and chiral arrangement.
What is liquid crystal discuss the structure of nematic smectic and cholesteric liquid crystal?
What is liquid crystals give its principle and working?
Principle of liquid crystal display A liquid crystal display (LCD) has liquid crystal material sandwiched between two sheets of glass. Without any voltage applied between transparent electrodes, liquid crystal molecules are aligned in parallel with the glass surface.
What is liquid crystal discuss in detail about the classification and applications of liquid crystals?
Liquid crystals can be divided into thermotropic, lyotropic and metallotropic phases. Thermotropic and lyotropic liquid crystals consist mostly of organic molecules, although a few minerals are also known. Thermotropic LCs exhibit a phase transition into the liquid-crystal phase as temperature is changed.