Effect of Sonication on Phase Transition Temperature of Cholesteryl Oleyl Carbonate
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https://doi.org/10.59287/ijanser.1439Keywords:
Liquid Crystals, Cholesteryl Oleyl Carbonate, Sonication, Isentropic Compressibility, Phase TransitionAbstract
Cholesteryl oleyl carbonate (COC) was dissolved in chloroform and sonicated at different times (60, 120, 300, 900 and 1500 s). In order to calculated isentropic compressibility (s) of prepared solutions, the density () and speed of sound (u) values were measured using a density and sound velocity meter at different temperatures (between 288.0 and 318.0 K). COC liquid crystals (LCs) were coated onto glass substrates by spin coating technique using the prepared un-sonicated and sonicated COC solutions. The images of all the COC LCs were by a polarizing optical microscopy (POM) with integrating temperature apparatus in range of 288.0 and 318.0 K. The phase transition temperatures (Tp) of the prepared COC were determined by means of the plotted s vs. T graphs and POM images. The phase transition behavior was analyzed by the comparison of these results in terms of sonication time. It was observed that low sonication times (60 and 120 s) caused to the high up value.
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