TY - GEN
T1 - Pre-organized liquid crystals
T2 - Emerging Liquid Crystal Technologies VII
AU - Nishiyama, Isa
AU - Tabe, Yuka
AU - Yamamoto, Jun
AU - Takanishi, Yoichi
AU - Ishii, Yoko
AU - Yokoyama, Hiroshi
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - Biaxial nematic liquid crystals have attracted much attention from both fundamental and application points of view, because the fast response based on the rotation of the minor director is expected. So far, different molecular designs have been proposed for the emergence of the biaxial nematic phase. Among that, we have been interested in applying "preorganization" concept on generating the biaxiality. Dimeric liquid crystal compounds have been prepared in line with this concept in which two mesogenic parts are linked by the biphenyl connecting group. The pre-organized dimmer shows an anomalous textural change, for vertically-aligned and free-standing film samples, at the smectic C (SmC)- nematic (N) phase transition, in which the Schlieren texture of the SmC changes into the other Schlieren texture of the N phase. There are two possible explanations for this textural change, i.e., the occurrence of the director change at the SmC-N phase transition or the emergence of biaxiality in the N phase. The electric-field-induced birefringence has also been measured in detail for investigating the biaxial nature of the sample.
AB - Biaxial nematic liquid crystals have attracted much attention from both fundamental and application points of view, because the fast response based on the rotation of the minor director is expected. So far, different molecular designs have been proposed for the emergence of the biaxial nematic phase. Among that, we have been interested in applying "preorganization" concept on generating the biaxiality. Dimeric liquid crystal compounds have been prepared in line with this concept in which two mesogenic parts are linked by the biphenyl connecting group. The pre-organized dimmer shows an anomalous textural change, for vertically-aligned and free-standing film samples, at the smectic C (SmC)- nematic (N) phase transition, in which the Schlieren texture of the SmC changes into the other Schlieren texture of the N phase. There are two possible explanations for this textural change, i.e., the occurrence of the director change at the SmC-N phase transition or the emergence of biaxiality in the N phase. The electric-field-induced birefringence has also been measured in detail for investigating the biaxial nature of the sample.
KW - biaxiality
KW - electric-field-induced birefringence
KW - molecular design
KW - nematic
KW - pre-organization
KW - texture
UR - http://www.scopus.com/inward/record.url?scp=84857604481&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84857604481&partnerID=8YFLogxK
U2 - 10.1117/12.913573
DO - 10.1117/12.913573
M3 - Conference contribution
AN - SCOPUS:84857604481
SN - 9780819489227
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Emerging Liquid Crystal Technologies VII
Y2 - 22 January 2012 through 25 January 2012
ER -