Emsley James W, Lesot Philippe, Luckhurst Geoffrey R, Meddour Abdelkrim, Merlet Denis
School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Apr;87(4):040501. doi: 10.1103/PhysRevE.87.040501. Epub 2013 Apr 3.
The twist-bend nematic, an enantiomorphic liquid-crystalline phase, exhibited by the structurally symmetric liquid-crystal dimer CB7CB is induced to form a single domain of uniform handedness, in the bulk, by the addition of the dopant chiral solute (S)-1-phenylethanol. Addition of a nonracemic (or scalemic) mixture of both R and S enantiomers of this solute produced equal volumes of P and M chiral domains for the twist-bend nematic phase. This seeding of the domains in an enantiomorphic nematic conglomerate is revealed using deuterium NMR spectroscopy.
结构对称的液晶二聚体CB7CB所呈现的扭曲弯曲向列相，即一种对映形态的液晶相，通过添加掺杂剂手性溶质（S）-1-苯乙醇，在本体中被诱导形成具有均匀旋向性的单畴。添加该溶质的R和S对映体的非外消旋（或非等摩尔）混合物，会为扭曲弯曲向列相产生等体积的P和M手性畴。利用氘核磁共振光谱揭示了这种对映形态向列聚集体中畴的这种晶种形成。
