21 May 2015 Relaxation phenomena in nematic liquid crystals with multiwall carbon nanotubes adding
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Abstract
Theoretical and experimental studies about the influence of an external magnetic field on a nematic liquid crystal with carbon nanotubes adding are presented. Planar oriented cells filled with a mixture of MCL-6601 (Merck) nematic and multi-walled carbon nanotubes were subjected to a magnetic field higher than the critical one for the magnetic Freedericksz transition. A laser beam was used to observe the molecular director distortion. Dynamical measurements of the transmitted light intensity were performed when the magnetic field was switched on and off. The results were used to evaluate the relaxation times of the mixture and to show the influence of the carbon nanotubes on these parameters. We also present a theoretical model to explain the experimental results.
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Cristina Cîrtoaje, Victor Stoian, Emil Petrescu, Cornelia Moţoc, "Relaxation phenomena in nematic liquid crystals with multiwall carbon nanotubes adding", Proc. SPIE 9517, Smart Sensors, Actuators, and MEMS VII; and Cyber Physical Systems, 95171G (21 May 2015); doi: 10.1117/12.2178333; https://doi.org/10.1117/12.2178333
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