2024-03-29T05:12:05Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00023224
2023-01-16T04:12:52Z
320:321:322
Evaluations of Mesogen Orientation in Thin Films of Polyacrylate with Cyanobiphenyl Side Chain
Tanaka, Daisuke
68853
Mizuno, Tasuku
68854
Hara, Mitsuo
68855
Nagano, Shusaku
68856
Saito, Itsuki
68857
Yamamoto, Katsuhiro
68858
Seki, Takahiro
68859
The orientation behavior of mesogens in a polyacrylate with cyanobiphenyl (CB) side chain in thin films was investigated in detail by UV–vis absorption spectroscopy and grazing incidence small-angle X-ray scattering (GI-SAXS) measurements using both high-energy X-rays of Cu Kα line (λ = 0.154 nm) and low-energy synchrotron X-rays (λ = 0.539 nm). By changing the film thickness ranging 7–200 nm, it is concluded that the planar orientation is predominant for thin films with thickness below 10–15 nm. This planar mesogen orientation near the substrate surface coexists with the homeotropically aligned CB mesogens in films thicker than 30 nm. For the thinnest 7 nm film, the planar orientation is unexpectedly lost, which is in consort with a disordering of smectic layer structure. Peculiar orienting characteristics of CB mesogen are suggested, which probably stem from the tendency to form an antiparallel arrangement of mesogens due to the strong dipole moment of the terminal cyano group.
journal article
ACS Publications
2016-03-31
application/pdf
application/pdf
Langmuir
15
32
3737
3745
http://doi.org/10.1021/acs.langmuir.6b00538
http://hdl.handle.net/2237/25418
0743-7463
https://nagoya.repo.nii.ac.jp/record/23224/files/SN_Langmuir2016-1a-SI.pdf
https://nagoya.repo.nii.ac.jp/record/23224/files/SN_Langmuir2016-1a.pdf
eng
https://doi.org/10.1021/acs.langmuir.6b00538
“This document is the Accepted Manuscript version of a Published Work that appeared in final form in [Langmuir], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [http://pubsdc3.acs.org/articlesonrequest/AOR-bDmMvp98HX5BEMUGaDcZ].”