Liquid crystal has tremendous impact in our day to day life. Many substances can exist in more than one state. For example, water can exist as a solid (ice), liquid, or gas(water vapor). The state of water depends on its temperature. Below 00C, water is a solid. As the temperature rises above 00C, ice melts to liquid water. When the temperature rises above 1000C, liquid water vaporizes completely. Some substances can exist in states other than solid, liquid, and vapor. For example, cholesterol myristate (a derivative of cholesterol) is a crystalline solid below 710C. When the solid is warmed to 710C, it turns into a cloudy liquid. When the cloudy liquid is heated to 860C, it becomes a clear liquid. Cholesterol myristate changes from the solid state to an intermediate state (cloudy liquid) at 710C, and from the intermediate state to the liquid state at 860C. Because the intermediate state exits between the crystalline solid state and the liquid state, it has been called the liquid crystal state. Thus Liquid crystals (LC) are a state of matter that has the property between those of a conventional liquid and those of solid crystal.
Cite this article:
Abhijit Ray. Liquid Crystal- A Review. Asian J. Research Chem. 5(4): April 2012; Page 563-567.