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Direct Observation of Changes in Focal Conic Domains of Cholesteric Films Induced by Ultraviolet Irradiationстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 14 августа 2017 г.
- Авторы: Sinitsyna Olga V., Bobrovsky Alexey Yu, Georgy Borisovich Meshkov, Yaminsky Igor V., Shibaev Valery P.
- Журнал: Journal of Physical Chemistry B
- Том: 121
- Номер: 21
- Год издания: 2017
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 5407
- Последняя страница: 5412
- DOI: 10.1021/acs.jpcb.7b01886
- Аннотация: The helical supramolecular structure of cholesteric liquid crystalline (LC) films predetermines their outstanding optical properties and the unique nanostructure of their surface. The introduction of photochromic dopants in these films opens up an interesting possibility for creation of smart cholesteric materials with photo-controllable optical and photovariable surface properties. Using atomic force microscope (AFM), we performed in situ measurements of the surface topography of cyclosiloxane LC cholesteric oligomer films during the cholesteric helix twisting caused by their preliminary ultraviolet (UV) irradiation. A chiral-photochromic isosorbide-base dopant was included into the films to control the cholesteric helix pitch by UV-irradiation. The initial films are characterized by planar texture with the presence of focal conic domains having the double-spiral relief on their surface. UV-irradiation of these films leads to the cholesteric helix twisting resulting in a decrease in the surface relief period, and the enlargement of defect areas between the domains. The detailed mechanisms of the rearrangement of the films surface structure due to the cholesteric helix twisting are suggested. They include the rotation and displacement of cholesteric layers in the bulk, and the nucleation of new ones at the surface in defect regions.
- Добавил в систему: Мешков Георгий Борисович