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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
- Control Number
- 0017164030
- International Standard Book Number
- 9798384095552
- Dewey Decimal Classification Number
- 541
- Main Entry-Personal Name
- Wu, Zhihao.
- Publication, Distribution, etc. (Imprint
- [S.l.] : University of Minnesota., 2024
- Publication, Distribution, etc. (Imprint
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- Physical Description
- 125 p.
- General Note
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- General Note
- Advisor: Massari, Aaron M.
- Dissertation Note
- Thesis (Ph.D.)--University of Minnesota, 2024.
- Summary, Etc.
- 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.
- Subject Added Entry-Topical Term
- Physical chemistry.
- Subject Added Entry-Topical Term
- Chemistry.
- Subject Added Entry-Topical Term
- Applied physics.
- Subject Added Entry-Topical Term
- Optics.
- Index Term-Uncontrolled
- Liquid crystals
- Index Term-Uncontrolled
- Solid-LC interfaces
- Index Term-Uncontrolled
- Spectroscopy
- Index Term-Uncontrolled
- Sum frequency generation
- Index Term-Uncontrolled
- Thermotropic LCs
- Added Entry-Corporate Name
- University of Minnesota Chemical Physics
- Host Item Entry
- Dissertations Abstracts International. 86-03B.
- Electronic Location and Access
- 로그인을 한후 보실 수 있는 자료입니다.
- Control Number
- joongbu:654414
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[S.l.]▼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.
