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Viscoelastic properties of liquid crystals are very important for applications like display technology. Certain molecules do not show a single phase transition from the crystalline to the liquid state on heating, but rather a series of transformations involving new phases possessing a state of aggregation intermediate bctwcen those of highly ordered crystals and of isotropic liquids. For this reason they are termed as liquid crystals (LC) or mesogens. Liquid crystals can be roughly categorized as lyotropic or thennotropic liquid crystals. Heating such crystalline solids or cooling them from their isotropic liquid phase can give rise to liquid crystalline phases. Several materials exist in the LC phase at room temperature, and many other room temperature LC materials can be produced by using mixtures of compounds. All components of the mixture need not necessarily be individually capable of forming LC phases in the latter case. An essential requirement for liquid crystalline or mesomorphic behaviour is that the molecules must be geometrically anisotropic in shape. The ultrasonic velocity measurement is a unique tool in characterizing the structure and properties of the system and provides significant information on the arrangement of matter in solutions and also finds an extensive application in studying the nature of intermolecular forces. In the present work, attempts have been made to investigate the behavior of cholesteryl oleyl carbonate at various concentrations also at different temperatures. The Ultrasonic velocity, viscosity and density are measured experimentally. In order to get more information on the nature and strength of molecular interaction, we have calculated the viscosity of cholestryl oleyl carbonate is done according to the statistical calculations (19,20).

Viscosity variation of Cholesteryl oleyl carbonate at various temperature with Acoustic parametres