Odarchenko, Y;
Defaux, M;
Rosenthal, M;
Akhkiamova, A;
Bovsunovskaya, P;
Melnikov, A;
Rodygin, A;
... Ivanov, DA; + view all
(2018)
One Methylene Group in the Side Chain Can Alter by 90 Degrees the Orientation of a Main-Chain Liquid Crystal on a Unidirectional Substrate.
ACS Macro Letters
, 7
(4)
pp. 453-458.
10.1021/acsmacrolett.8b00044.
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Abstract
The mechanisms of orientation of columnar liquid crystals (LCs) on PTFE-rubbed surface are explored on a homologous series of symmetrically-substituted poly(di-n-alkylsiloxanes) (PDAS). It is shown that by increasing the side-chain length in steps of one CH2 group the orientation of PDAS switches back and forth from perpendicular to parallel with respect to PTFE chains. These changes sensitive to the smallest possible variation of the macromolecular structure (i.e., modification of the side chain length by just one CH2 group) reflect the change of the alignment mechanism identified as grapho-epitaxial or epitaxial for the perpendicular and parallel orientation, respectively. The results show that two orthogonal LC orientations are realizable on the same rubbed substrate, which can open new perspectives in the field of organic and printed electronics such as multi-domain LCD technology.
| Type: | Article |
|---|---|
| Title: | One Methylene Group in the Side Chain Can Alter by 90 Degrees the Orientation of a Main-Chain Liquid Crystal on a Unidirectional Substrate |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsmacrolett.8b00044 |
| Publisher version: | http://doi.org/10.1021/acsmacrolett.8b00044 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | alignment, confinement, epitaxy, liquid-crystalline polymer, poly(di-n alkylsiloxane). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10060309 |
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