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Evaluation of dynamics of liquid crystalline structures by time-resolved X-ray diffraction

通过时间分辨 X 射线衍射评估液晶结构的动力学

基本信息

批准号：
16350070
负责人：
TAKANISHI Yoichi
金额：
$ 9.86万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16350070/
关键词：
Liquid Crystals X-ray diffraction Structure analysis Dynamics Chirality

项目摘要

The purposes of this research are (1) the determination of the structures of novel liquid crystalline phases by powerful and small bema X-ray diffraction using the confocal X-ray source, and (2) the evaluation of the layer dynamics of smectic liquid crystals by time-resolved x-ray diffraction using the image intensifier and CCD camera.In the first year, I introduced confocal mirror in order to increase the incident X-ray intensity and to decrease the beam size. In the second year, I introduced the image intensifier and CCD camera in order to measure time resolved x-ray diffraction. At the same time, I measured the x-ray diffraction of the B4 and Bx phases of binary mixture of P-8-0PIMB and 5CB, and the determined the mixing ratio dependence of the structures for two years.In the last year, I measured the terminal chain dependence of the layer structure of bent-shaped dimers. It was found that the structure changes from a single layer to the 2D frustrated one with increasing the terminal chain. Previously, the structure was considered to be bilayer in the compound in which the carbon number of the terminal chain length is 16, but it was found to form frustrated layer even in this compound.With respect to the optically isotropic mesophase called SmBPiso, it has been already found that the selective reflection band was shifted by the laser irradiation. In order to study-the layer response at this process, I measured time-resolved x-ray diffraction of this phase. As a result, the layer response was found to be several hundreds of msec, which is longer than the optical response (several msec).

这项研究的目的是(1)利用共焦X射线源的强而小的贝玛X射线衍射来确定新型液晶相的结构，以及(2)利用像增强器和CCD相机的时间分辨X射线衍射来评价近晶液晶的层动力学。第一年，我引入了共焦镜，以增加入射X射线的强度，减小光束尺寸。第二年，我引入了像增强器和ccd相机来测量时间分辨的x射线衍射。同时，我测量了P-8-0PIMB和5CB二元混合物的B4和Bx相的X射线衍射，并测定了两年来结构的混合比依赖关系。结果表明，随着末端链的增加，其结构由单层转变为二维受阻结构。对于光学各向同性的中间相SmBPiso，已经发现激光照射使其选择反射带发生了移动，但在这种化合物中，端链碳数为16的化合物的结构被认为是双层结构。为了研究这一过程中的层响应，我测量了这一相的时间分辨x射线衍射。结果，层响应被发现是几百毫秒，这比光学响应(几毫秒)要长。

项目成果

期刊论文数量（11）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Intralayer molecular orientation in the B1 phase of a prototype bent-core molecule P-6-O-PIMB studied by X-ray microbeam diffraction

通过 X 射线微束衍射研究原型弯核分子 P-6-O-PIMB 的 B1 相中的层内分子取向

DOI：
发表时间：
2006
期刊：
J. Mater. Chem. 16
影响因子：
0
作者：
Yoichi Takanishi;Hideo Takezoe;Junji Watanabe;Yumiko Takahashi and Atsuo Iida
通讯作者：
Yumiko Takahashi and Atsuo Iida

Terahertz spectroscopy in smectic phases of banana-shaped molecule

香蕉形分子近晶相的太赫兹光谱

DOI：
发表时间：
2005
期刊：
Phys.Rev.E 71
影响因子：
0
作者：
Y.Takanishi;K.Ishikawa;J.Watanabe;H.Takezoe;M.Yamashita;K.Kawase
通讯作者：
K.Kawase

Organic field-effect transistors based on new TTF-based liquid crystalline materials

DOI：
10.1016/j.synthmet.2005.01.005
发表时间：
2005-03
期刊：
Synthetic Metals
影响因子：
4.4
作者：
M. Katsuhara;Isao Aoyagi;H. Nakajima;Takehiko Mori;T. Kambayashi;M. Ofuji;Y. Takanishi;K. Ishikawa;H. Takezoe;H. Hosono
通讯作者：
M. Katsuhara;Isao Aoyagi;H. Nakajima;Takehiko Mori;T. Kambayashi;M. Ofuji;Y. Takanishi;K. Ishikawa;H. Takezoe;H. Hosono

Frustrated smectic layer structures in bent-shaped dimer liquid crystals

弯曲二聚体液晶中的受挫近晶层结构

DOI：
发表时间：
2006
期刊：
Phys. Rev. E 74
影响因子：
0
作者：
Y.Takanishi;M.Toshimitsu;M.Nakata;N.Takada;T.Izumi;K.Ishikawa;H.Takezoe;J.Watanabe;Y.Takahashi;A.Iida
通讯作者：
A.Iida

Intralayer molecular orientation in the B1 phase of a proto-type bent-core molecule P-6-O-PIMB studies by X-ray microbeam diffraction

通过 X 射线微束衍射研究原型弯核分子 P-6-O-PIMB B1 相的层内分子取向