Structure and orientation control of liquid crystal defects by physical and chemical surface treatments = 물리화학적 표면처리를 이용한 액정 결함구조의 구조 및 배향 제어에 관한 연구

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Liquid crystal (LC) materials as one of soft building blocks possessing both anisotropy and fluidity have superior advantages such as rapid formation of structures, easy deformation by change of external environments including surface treatments, electric and magnetic fields. Despite of their unique properties, it is still difficult to apply to new applications except for liquid crystal displays (LCDs). Recently, smectic LC defect structures have been proposed as a new type of bottom-up lithographic templates. Especially, well ordered hexagonal array of toric focal conic domains (TFCDs) have shown various useful applications including particle trapping, soft lithographic templates, microlens array and photomask. However, closed-packed hexagonal arrangement of TFCDs by the circular defect line is a limitation as the lithographic template and decrease availability of applications. In this thesis, we introduce simple and cost-effective surface treatment methods for controlling the structures and orientation of LC defects. Physical surface treatments by multi-directional rubbing and physical stamping methods create linear ridges that affect the LC alignment in the polymeric alignment layers. Chemical surface treatment is achieved by printing metal salts on the substrate that influence the orientation of LC molecules with the patterned stamps. We believe that simple and easy approaches facilitate the use of LC structures, one of the lithographic templates, and enable applications to new optoelectronic devices.
Advisors
Jung, Hee Taeresearcher정희태researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2017.8,[vi, 95 p. :]

Keywords

liquid crystal▼asoft building block▼afocal conic domain▼asurface treatment▼alithographic template; 액정물질▼a소프트 빌딩블록▼a결함구조▼a표면처리▼a리소그래픽 주형

URI
http://hdl.handle.net/10203/241894
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=718842&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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