Determination of the liquid crystals phase transition temperatures using optical rotation effect |
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| Authors: | Xiao-ling Niu Peng Liu Chang-long Cai |
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| Affiliation: | 1. College of Chemistry and Material Science , Shaanxi Normal University , Xi’an, Shaanxi 710062, China;2. College of Materials and Chemical Engineering , Xi’an Technological University , Xi’an 710032, China;3. College of Chemistry and Material Science , Shaanxi Normal University , Xi’an, Shaanxi 710062, China;4. School of Optoelectronical Engineering , Xi’an Institute of Technology , Xi’an 710072, China |
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| Abstract: | Using optical rotation effect, a sensitive, simple optical analytical system is developed for determining the phase transition temperatures of liquid crystals (LCs). When a monochromatic polarized light passes through LCs sample and analyzer, the light intensity changes with temperature. Especially, during the phase transition process, the intensity varies greatly due to optical rotation effect. The variation of light intensity versus variation of temperature curve shows the phase transition temperatures of LCs clearly. The phase transition temperatures of three cholesteric liquid crystals (ChLCs) and a nematic liquid crystals (NLCs) were detected by this method, and compared with those of the differential scanning calorimetry (DSC) and polarized light microscope (PLM) methods. |
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| Keywords: | optical rotation light intensity cholesteric liquid crystals phase transition temperatures |
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