Interfacial Structure in Thermotropic Liquid Crystals as Studied by Vibrational Sum Frequency Generation Spectroscopy
Interfacial Structure in Thermotropic Liquid Crystals as Studied by Vibrational Sum Frequency Generation Spectroscopy
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152823
- ISBN
- 9798384095552
- DDC
- 541
- 저자명
- Wu, Zhihao.
- 서명/저자
- Interfacial Structure in Thermotropic Liquid Crystals as Studied by Vibrational Sum Frequency Generation Spectroscopy
- 발행사항
- [Sl] : University of Minnesota, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 125 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Massari, Aaron M.
- 학위논문주기
- Thesis (Ph.D.)--University of Minnesota, 2024.
- 초록/해제
- 요약Liquid crystals (LCs) are widely used in many optoelectronic devices. The study of LC interfaces is critical for understanding the molecular interactions within the LC devices and improving the device performance. Air-LC, liquid-LC, and polymer-LC interfaces have been extensively studied in the literature, however, the molecular orientation and ordering of the thermotropic LCs and solid interfaces remain underexplored. Emerging LC alignment techniques, such as nanopatterning, oblique evaporation, and photo-induced alignment, show the need for in-depth studies of solid-LC interfaces. In this work vibrational sum frequency generation spectroscopy (VSFG), a second-order nonlinear optical technique, was used to study the orientation of the interfacial LC molecules on solid substrates. Chapter 1 introduces the basics of LCs and LC devices, discussing the importance of solid-LC interfaces. Chapter 2 covers the theoretical background and experimental setup of VSFG. Chapter 3 discusses the design of sample cells and the considerations necessary for conducting temperature-controlled and voltage-controlled VSFG experiments. Chapter 4 presents a detailed study of the solid-LC interfaces of thermotropic 8CB LCs using VSFG and X-ray reflectivity (XRR), comparing the bulk and interfacial LC behaviors across different phases. Chapter 5 explores the interfacial molecular behavior of nematic LCs 5CB under an applied voltage in a working LC sample cell. Nickel ultra-thin metallic film (UTMF) was used as transparent electrode for the first time in a VSFG experiment.
- 일반주제명
- Physical chemistry
- 일반주제명
- Chemistry
- 일반주제명
- Applied physics
- 일반주제명
- Optics
- 키워드
- Liquid crystals
- 키워드
- Spectroscopy
- 키워드
- Thermotropic LCs
- 기타저자
- University of Minnesota Chemical Physics
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798384095552
■035 ▼a(MiAaPQ)AAI31559754
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a541
■1001 ▼aWu, Zhihao.
■24510▼aInterfacial Structure in Thermotropic Liquid Crystals as Studied by Vibrational Sum Frequency Generation Spectroscopy
■260 ▼a[Sl]▼bUniversity of Minnesota▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a125 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Massari, Aaron M.
■5021 ▼aThesis (Ph.D.)--University of Minnesota, 2024.
■520 ▼aLiquid crystals (LCs) are widely used in many optoelectronic devices. The study of LC interfaces is critical for understanding the molecular interactions within the LC devices and improving the device performance. Air-LC, liquid-LC, and polymer-LC interfaces have been extensively studied in the literature, however, the molecular orientation and ordering of the thermotropic LCs and solid interfaces remain underexplored. Emerging LC alignment techniques, such as nanopatterning, oblique evaporation, and photo-induced alignment, show the need for in-depth studies of solid-LC interfaces. In this work vibrational sum frequency generation spectroscopy (VSFG), a second-order nonlinear optical technique, was used to study the orientation of the interfacial LC molecules on solid substrates. Chapter 1 introduces the basics of LCs and LC devices, discussing the importance of solid-LC interfaces. Chapter 2 covers the theoretical background and experimental setup of VSFG. Chapter 3 discusses the design of sample cells and the considerations necessary for conducting temperature-controlled and voltage-controlled VSFG experiments. Chapter 4 presents a detailed study of the solid-LC interfaces of thermotropic 8CB LCs using VSFG and X-ray reflectivity (XRR), comparing the bulk and interfacial LC behaviors across different phases. Chapter 5 explores the interfacial molecular behavior of nematic LCs 5CB under an applied voltage in a working LC sample cell. Nickel ultra-thin metallic film (UTMF) was used as transparent electrode for the first time in a VSFG experiment.
■590 ▼aSchool code: 0130.
■650 4▼aPhysical chemistry
■650 4▼aChemistry
■650 4▼aApplied physics
■650 4▼aOptics
■653 ▼aLiquid crystals
■653 ▼aSolid-LC interfaces
■653 ▼aSpectroscopy
■653 ▼aSum frequency generation
■653 ▼aThermotropic LCs
■690 ▼a0494
■690 ▼a0485
■690 ▼a0215
■690 ▼a0752
■71020▼aUniversity of Minnesota▼bChemical Physics.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0130
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164030▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
