The influence of structure and concentration of cyano-terminated and terphenyl dopants on helical pitch and helical twist sense in orthoconic antiferroelectric mixtures |
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| Authors: | Michał Czerwiński Marzena Tykarska Roman Dąbrowski Aleksandra Chełstowska Magdalena Żurowska Rafał Kowerdziej |
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| Institution: | 1. Institute of Chemistry, Military University of Technology , Warsaw , Poland mczerwinski@wat.edu.pl;3. Institute of Chemistry, Military University of Technology , Warsaw , Poland;4. Institute of Applied Physics, Military University of Technology , Warsaw , Poland |
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| Abstract: | A bicomponent mixture in the orthoconic aniferroelectric phase, based on three-ring esters with fluorine atoms and ether group in a nonchiral chain, was doped with a variety of cyano-terminated compounds containing different numbers of phenyl rings in a rigid core and a terminal chain of different chirality. Compounds with two chiral chains were added to the basic mixture. The influence of the structure and concentration of dopant on the temperature-dependence of helical parameters, such as helical pitch and twist sense, were assessed by spectrophotometric and polarimetric methods. Long cyano-terminated compounds were found to be better than the other dopants tested for improving the usable properties of the antiferroelectric mixtures. |
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| Keywords: | antiferroelectric phase helical pitch helical twist sense |
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