TY - JOUR
T1 - Controlling the Columnar Order in a Discotic Liquid Crystal by Kinetic Arrest of Disc Tumbling
AU - Chen, Zhenxuan
AU - Bishop, Camille
AU - Thoms, Erik
AU - Bock, Harald
AU - Ediger, M. D.
AU - Richert, Ranko
AU - Yu, Lian
N1 - Funding Information:
We thank the NSF (DMR-1904601) for supporting this work. Additional support was received from NSF through the University of Wisconsin Materials Research Science and Engineering Center (DMR-1720415).
Publisher Copyright:
©
PY - 2021/6/22
Y1 - 2021/6/22
N2 - By cooling at different rates, the discotic liquid crystal (LC) phenanthro[1,2,3,4-ghi]perylene-1,6,7,12,13,16-hexacarboxylic 6,7,12,13-tetraethyl, 1,16-dimethyl ester (PNP) can form glasses of widely different columnar orders, including zero order. The temperature at which the columnar order is frozen at a given cooling rate corresponds to a slow relaxation mode revealed by dielectric spectroscopy and attributed to disc tumbling within the column. The control of the columnar order in this discotic LC is analogous to the control of the smectic order in calamitic LCs reported earlier. In both cases, kinetic arrest of a slow molecular rotation above the calorimetric Tg freezes the LC order. This principle can be applied to predict and control molecular packing in the fabrication of organic electronics.
AB - By cooling at different rates, the discotic liquid crystal (LC) phenanthro[1,2,3,4-ghi]perylene-1,6,7,12,13,16-hexacarboxylic 6,7,12,13-tetraethyl, 1,16-dimethyl ester (PNP) can form glasses of widely different columnar orders, including zero order. The temperature at which the columnar order is frozen at a given cooling rate corresponds to a slow relaxation mode revealed by dielectric spectroscopy and attributed to disc tumbling within the column. The control of the columnar order in this discotic LC is analogous to the control of the smectic order in calamitic LCs reported earlier. In both cases, kinetic arrest of a slow molecular rotation above the calorimetric Tg freezes the LC order. This principle can be applied to predict and control molecular packing in the fabrication of organic electronics.
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U2 - 10.1021/acs.chemmater.1c01331
DO - 10.1021/acs.chemmater.1c01331
M3 - Article
AN - SCOPUS:85108666708
SN - 0897-4756
VL - 33
SP - 4757
EP - 4764
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 12
ER -