Fast and Slow Dynamics in a Discotic Liquid Crystal with Regions of Columnar Order and Disorder

被引：37

作者：

Hansen, M. R. ^{[1
]}

Feng, X. ^{[1
]}

Macho, V. ^{[1
]}

Muellen, K. ^{[1
]}

Spiess, H. W. ^{[1
]}

Floudas, G. ^{[2
,3
]}

机构：

[1] Max Planck Inst Polymer Res, D-55021 Mainz, Germany

[2] Univ Ioannina, Dept Phys, GR-45110 Ioannina, Greece

[3] Fdn Res & Technol Hellas FORTH, BRI, Ioannina 45110, Greece

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 25期

关键词：

HEXA-PERI-HEXABENZOCORONENES; SOLID-STATE; X-RAY; NMR; ELECTRONICS; RHEOLOGY; SYSTEMS; STRANDS;

D O I：

10.1103/PhysRevLett.107.257801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Aromatic disk-shaped molecules tend to self-organize into a herringbone packing where the disks are inclined at angles +/-theta with respect to the axis of the column. In discotic liquid crystals this can introduce defects between stacks of limited length. In a C(3)-symmetric hexa-peri-hexabenzocoronene, solid-state NMR, x-ray scattering, and rheology identifies such a packing with theta = 43 degrees and stacks of about seven disks. Disordered regions containing defects fill the space in between the ordered stacks. Biaxial intra-and intercolumnar dynamics differing by eight decades are identified.

引用

页数：5

共 27 条

[21] Structure assignment in the solid state by the coupling of quantum chemical-calculations with NMR experiments: A columnar hexabenzocoronene derivative [J].