Changes in the Thermodynamic Properties of 4-n(Hexyloxy) Benzoic Acid by Li~(+3) Ion Beam Irradiation

摘要

Li ion beam irradiationpersuadedmodificationsin the thermodynamic properties of liquid crystalline material 4-n (hexyloxy) benzoic acid (HOBA) have been investigated. The irradiation has been carried out by a pelletron beam using 3 nA current at fluences (10~(10), 10~(11), 10~(12), 10~(13) ions/cm~2) at room temperature in the crystalline phase of the material. The pure and irradiated liquid crystalline material has a phase sequence of I-N-Cr. The pure and irradiated materials were explored using differential scanning calorimeter (DSC). Thermodynamic studies of the pure and irradiated materials reveal that all the transition temperature is depressed as compared to those of pure materials by the Li ion beam irradiation. The average transition enthalpies and entropies of the irradiated materialare increased as compared to those ofpurematerial.