Elastic properties of bimesogenic liquid crystals

摘要: The second nematic phase found in some bimesogenic liquid crystals with an odd flexible spacer has aroused considerable interest due to many unusual properties exhibited by them. However, the reason for such molecules exhibit transitions modulated is still unclear. Dozov [Europhys Lett. 2001;56:247] predicted that negative K 33 can lead a where director either splay-bend or twist-bend distribution. Though various theoretical studies have suggested this scenario may be valid, no experimental evidence so far been given. In order study influence of elastic constants, we measured splay and bend constants ordinary dimer material, CBC11CB, temperatures down 0.6°C above Nx–Nu transition. Our results show constant reduced factor 2 compared closer I-Nu transition but positive trend does not seem will extrapolate zero fall below it t...