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Structure-Property Relationships for Nanophase Segregating Groups in SmAP Mesogens
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Structure-Property Relationships for Nanophase Segregating Groups in SmAP Mesogens. |
| 개인저자 | Guzman, Edward. |
| 단체저자명 | University of Colorado at Boulder. Chemistry. |
| 발행사항 | [S.l.]: University of Colorado at Boulder., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 246 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-04B. Dissertation Abstract International |
| ISBN | 9781085797481 |
| 학위논문주기 | Thesis (Ph.D.)--University of Colorado at Boulder, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
Advisor: Walba, David M. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | The SmAPf liquid crystal phase of the bent-core mesogen W586 represents the first reported orthogonal ferroelectric liquid crystal material, designed and prepared in the Walba group, characterized by the Clark group, and first reported in Science in 2011. The design of W586 involved the introduction of a strongly nanophase segregating group terminating the "tail" of an antiferroelectric SmAPA mesogen published by the Sadashiva group. The SmAPF phase demonstrates interesting and potentially useful electro-optic properties, including fast phase-only electrooptic modulation of light, with analog V-shape switching with optical latching. Since the synthesis of W586, the Walba group has continued the study of the SmAPF phase through the synthesis of a variety of isomers, homologs, and derivatives of W586, designed to elucidate structure-property relationships for formation of the phase, and allowing for the design of materials with properties tuned for specific applications. This work revealed a dramatic ferroelectric-antiferroelectric odd-even effect, where homologs of W586 with an odd number of methylene groups in the mesogen tail separating the core and the nanophase segregating tail terminus exhibit the SmAPf phase, while even numbered tails exhibit the SmAPA phase, though the nanophase segregating groups themselves remain identical.Here we report the synthesis and study of new classes of SmAP mesogens which vary the nanophase segregating groups. The new mesogens involve two distinct classes of materials: first involving changes in the structure of the carbosilane nanophase segregating group found in W586, and second, materials possessing polyfluorioinated oligoethylene glycol (PFOEG) tails as the nanophase segregating group in SmAP mesogens. The latter was first reported by Korblova et al. in a system with a very different bent core. In the process, it was discovered that the antiferroelectric SmAPA phase can also exhibit V-shaped switching. This unexpected and remarkable phenomenon is shown to result from the formation of a kinetically trapped SmAP癤풣 state after initial application of an electric field. |
| 일반주제명 | Chemistry. Materials science. Applied physics. Nanotechnology. Nanoscience. |
| 언어 | 영어 |
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