Effect of Sonication on Phase Transition Temperature of Cholesteryl Oleyl Carbonate
Abstract views: 97
/ 
PDF downloads: 81
DOI:
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.
Downloads
References
Carlescu I (Ed.), Liquid Crystals-Self-Organized Soft Functional Materials for Advanced Applications, Intech Open, 2018.
Collings P J, Hird M, Introduction to Liquid Crystals: Chemistry and Physics, 1st Edn, CRC Press, 1997.
Oswald P, Pieranski P, Nematic and Cholesteric Liquid Crystals: Concepts and Physical Properties Illustrated by Experiments, 1st Edn, CRC Press, 2005.
Schenning A, Crawford G P, Broer D J, Liquid Crystal Sensors, 1st Edn, CRC Press, 2017.
Borden H, Mingione J, Nance P, Microelectron Reliab, 11 (1972) 325.
Hanmura H, Kawakami H, Kaneko E, Displays, 2 (1981) 178.
Raynes E P, Nematic Liquid Crystals: Applications, University of Oxford, Oxford, UK, 2016.
Makey G, El-Daher M S, Al-Shufi K, Optik, 126 (2015) 917.
Thoen J, Cordoyiannis G, Glorieux C, Liq Cryst, 36 (2009) 669.
Hiltrop K, Hasse J, Stegemeyer H, Ber Bunsenge Phys Chem, 98 (1994) 209.
Amrutha A S, Achalkumar A S, Li Q, Light-Driven Phase Transitions in Liquid Crystals and Their Applications, Wiley-VCH Verlag GmbH & Co, 2018, Chap. 7.
Lagerwall J P F, Scalia G, Curr Appl Phys, 12 (2012) 1387.
Pisipati V G K M, Rao N V S, Phase Transit, 4 (1984) 91.
Roshi A, Iannacchione G S, Clegg P S, Birgeneau R J, Phys Rev E, 69 (2004) 031703.
Gogoi B A, Int J Adv Res, 4 (2016) 1353.
Lin Y.Y, Chen K S, Lin S Y, J Chin Chem Soc, 42 (1995) 865.
Chuealee R, Wiedmann T S, Srichana T, J Mater Res, 24 (2009) 156.
Martinez-Felipe A, Ballester-Sarrias E, Imrie C T, Ribes-Greus A, J Appl Polym Sci, 115 (2010) 3282.
Lisensky G, Boatman E, J Chem Educ, 82 (2005) 1360A.
Cetin E O, Gundogdu E, Baspinar Y, Karasulu E, Kirilmaz L, Drug Dev Ind Pharm, 39 (2013) 1881.
Lin Y Y, Chen K S, Lin S Y, J Control Release, 41 (1996) 163.
Hyun J K, Kim J S, Kim S D, Yoon H S, Lee J Y, Kim W S, J Chem Eng Jpn, 35 (2002) 1211.
Schaefer D W, Suryawanshi C, Pakdel P, Ilavsky J, Jemian P R, Physica A, 314 (2002) 686.
Velickovic D T, Milenovic D M, Ristic M S, Veljkovic V B, Ultrason Sonochem, 13 (2006) 150.
Cheeke J D N, Fundamentals and Applications of Ultrasonic Waves, 1st Edn, CRC Press: USA, 2002.
Lempriere B M, Ultrasound and Elastic Waves, 1st Edn, Academic Press, 2002.
M. Nakahara, Y. Yoshimura, J. Osugi, A Dilatometric Study of Mesomorphic Transitions in Cholesteryl Oleyl Carbonate and Cholesteryl Oleate, Bulletin of the Chemical Society of Japan, 54 (1981) 99-102
G. Gray, M. Hannant, The crystalline state and the mesophases of cholesteryl oleyl carbonate, Molecular Crystals and Liquid Crystals, 53 (1979) 263-270.
K. Lushington, G. Kasting, C. Garland, A test of tricriticality in cholesteryl oleyl carbonate, Physics Letters A, 74 (1979) 143-145.
P. Pollmann, G. Scherer, Pressure Dependence of the Cholesteric Pitch Below and Above a Tricritical Point. Studies on Cholesteryl Myristate and Cholesteryl Oleyl Carbonate Near the Cholesteric-to-Smectic a Phase Transition, Molecular Crystals and Liquid Crystals, 34 (1976) 189-196.
W. Elser, J.L. Pohlmann, P.R. Boyd, The preparation of high-purity cholesteryl oleyl carbonate, Molecular Crystals and Liquid Crystals, 36 (1976) 279-292.
P. Adamski, A. Dylik-Gromiec, Temperature Range and Optical Properties Investigations of Cholesteryl Oleyl Carbonate, Cholesteryl Nonanoate and Their Mixtures, Molecular Crystals and Liquid Crystals, 25 (1974) 281-286.
P. Keyes, H. Weston, W. Daniels, Tricritical behavior in a liquid-crystal system, Physical Review Letters, 31 (1973) 628.
