Anchoring transition of bent-rod liquid crystal dimers on different surfaces

Guksik Lee Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2–12–1, O-okayama, Meguro–ku, Tokyo, 152–8552, Japan

Hyeon-cheol Jeong Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2–12–1, O-okayama, Meguro–ku, Tokyo, 152–8552, Japan; Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, San 30, Jangjeon–dong, Guemjeong–gu, Pusan, 609–735, Korea

Fumito Araoka Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2–12–1, O-okayama, Meguro–ku, Tokyo, 152–8552, Japan

Ken Ishikawa Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2–12–1, O-okayama, Meguro–ku, Tokyo, 152–8552, Japan

Jong Gun Lee Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, San 30, Jangjeon–dong, Guemjeong–gu, Pusan, 609–735, Korea

Kyung-Tae Kang Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, San 30, Jangjeon–dong, Guemjeong–gu, Pusan, 609–735, Korea

Mojca Cepic Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia

Hideo Takezoe Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2–12–1, O-okayama, Meguro–ku, Tokyo, 152–8552, JapanCorrespondence[email protected]

show all

Abstract

Non-symmetrical dimers have been synthesised, in which bent- and rod-shaped mesogenic molecules are linked by a flexible polymethylene spacer –(CH₂)_n–. It has been shown that compounds in which n = 5, 6 or 7 exhibit one (nematic), two (nematic and smectic), and no mesogenic phases, respectively. These exhibit a variety of anchoring transition behaviours depending on the mesogenic molecules (n = 5 or 6) and surfaces (polyimide surfaces for homeotropic and planar alignment, or a perfluoropolymer surface). Discontinuous and continuous planar-to-homeotropic orientational changes take place with decreasing temperature. These differences may originate from different dielectric anisotropy, and steric interactions caused by the directional relationship of bent and rod mesogens, depending on the length of the spacer. A possible explanation is suggested on the basis of surface–molecule interactions.

Keywords:

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Order Reprints Request Corporate Permissions

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

Request Academic Permissions

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.

Anchoring transition of bent-rod liquid crystal dimers on different surfaces

Related Research Data

Information for

Open access

Opportunities

Help and information

Anchoring transition of bent-rod liquid crystal dimers on different surfaces

Abstract

Reprints and Corporate Permissions

Academic Permissions

Related Research Data

Related research

To cite this article:

Download citation

Information for

Open access

Opportunities

Help and information

Keep up to date

Your download is now in progress and you may close this window

Login or register to access this feature