Study on the choresteric-smectic isothermal phase transition inducedby application of electric field
| Project/Area Number |
19350096
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials/Devices
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
SASAKI Takeo Tokyo University of Science, 理学部, 准教授 (80261501)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥19,630,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥4,530,000)
Fiscal Year 2009: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2008: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2007: ¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
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| Keywords | 液晶材料 / 素子 / 強誘電性液晶 / コレステリック相 / 電界誘起相転移 / 自発分極 / 3状態間スイッチング / 高分子安定化 |
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| Research Abstract |
A series of cholesteric liquid crystals possessing three ring structure as a mesogenic unit was synthesized. The liquid crystal exhibited an isothermal phase transition from planer phase to focal conic phase when an electric field was applied to the LC. The focal conic phase showed electro optical switching. The response time of the electro optical switching was about 600 micro s. The focal conic phase exhibited a spontaneous polarization of 5nC/cm^2. Those results indicate that the focal conic phase was a ferroelectric phase. Thus, It was shown that the cholesteric LC synthesized in this study exhibits isothermal phase transition from cholesteric phase to ferroelectric phase. The cholesteric LC shows three-states electro optical switching under application of electric field.
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Report
(4 results)
Research Products
(25 results)
