Binary System Exhibiting the Nematic to Twist-Bend Nematic Transition: Behavior of Permittivity and Elastic Constants

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• 作者：Srividhya Parthasarathi ; D. S. Shankar Rao ; Nani Babu Palakurthy ; C. V. Yelamaggad ; S. Krishna Prasad
• 刊名：Journal of Physical Chemistry B
• 出版年：2016
• 出版时间：June 9, 2016
• 年：2016
• 卷：120
• 期：22
• 页码：5056-5062
• 全文大小：491K
• 年卷期：0
• ISSN：1520-5207

文摘

We describe measurements of the permittivity and Frank elastic constant in the nematic phase of a binary system displaying a transition between the nematic (N) and the recently discovered twist-bend nematic (N_TB) phase. Among the salient features observed are (i) the existence of the N_TB phase even when the system is loaded with a high concentration (∼64 mol %) of a rodlike component; (ii) a clear signature in permittivity of the N–N_TB transition; and (iii) a lower value of the bend elastic constant compared to the splay over a large phase space, with the difference between the two becoming a maximum for an intermediate mixture. These studies further support the surprising idea that the elastic features associated with bent molecules can be further augmented by suitable rodlike additives.