| Project/Area Number |
59540178
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性
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| Research Institution | Nagoya University |
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Principal Investigator |
FUKUI Minoru Nagoya University, 工学部, 教授 (40093067)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1985: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1984: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | liquid crystal / ferroelectrics / スメクチック相 |
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| Research Abstract |
Many ferroelectric liquid crystals are being synthesized and their physical properties have been investigated by methods of the microscope,DSC,the dielectric measurements and etc.. In the ferroelectric (chiral smectic C) phase the liquid crystal is in a screw structure. i.e. the director of molecules of the liquid crystal in a layer tilt from the normal to the layer and the director in the next layer rotates around the normal with the fixed tilt angle. The angles of tilt and rotation behave critically at the <S_C> *- <S_A> and <S_C> *- <S_C> phase transitions. The behavior of angles has been studied as an excitation of soliton by the theory of incommensurate - commensurate(IC-C) phase transition. It has been revealed that ESR is a powerful method for the study IC-C phase transition of the ferroelectrics. In this study we intend to observe the texture of the liquid crystal by ESR and the microscope and study the variation of the texture by the concept of solitons. Phase transitions of liquid crystals,HS-927SO and HS-928SO, were measured by DSC and monotropic transitions of <S_A> - <S_C> * were observed. The temperature dependence of dielectric constants were measured in the various AC frequencies. The variation of the texture in the phase transition was observed by the microscope and VTR system controlled by the microcomputer.
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