Clarke, MJ and Musgrave, B and Coles, MJ and Blatch, AE and Coles, HJ (2004) Comparison of relative flexoelectric coefficients measured by different techniques. Proceedings of SPIE - The International Society for Optical Engineering, 5289. pp. 182-187. ISSN 0277-786XFull text not available from this repository.
While it is well known that it is possible to determine the effective flexoelectric coefficient of nematic liquid crystals using hybrid cells , this technique can be difficult due to the necessity of using a D.C. field. We have used a second method, requiring an A.C. field, to determine this parameter and here we compare the two techniques. The A.C. method employs the linear flexoelectrically induced linear electro-optic switching mechanism observed in chiral nematics. In order to use this second technique a chiral nematic phase is induced in an achiral nematic by the addition of a small amount of chiral additive (∼3% concentration w/w) to give helix pitch lengths of typically 0.5-1.0 μm. We note that the two methods can be used interchangeably, since they produce similar results, and we conclude with a discussion of their relative merits.
|Uncontrolled Keywords:||Chiral Flexoelectric Nematic|
|Divisions:||Div B > Photonics|
|Depositing User:||Cron job|
|Date Deposited:||04 Feb 2015 22:17|
|Last Modified:||01 May 2015 19:16|