Dynamic Processes in Ferroelectric Liquid Crystals
| Project/Area Number |
60460031
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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, Faculty of Engineering |
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Principal Investigator |
ISHIBASHI Yoshihiro Nagoya University, Faculty of Engineering, 工学部, 教授 (00023052)
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| Co-Investigator(Kenkyū-buntansha) |
ORIHARA Hiroshi Nagoya University, Faculty of Engineering, 工学部, 助手 (30177307)
WADA Mitsuo Shinshu University, Faculty of Liberal Arts, 教養部, 助教授 (20115653)
SAWADA Akikatsu Nagoya University, Faculty of Engineering, 工学部, 助教授 (30023154)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1986: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1985: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | Ferroelectric Liquid Crystals / Switching / Dielectric Anisotropy / Disclinations / Formation of Order / Scaling Rule / TNセル |
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| Research Abstract |
Processes of formation of various orders have been investigated with the image processing system including a video camera.
1. Polarization reversal in ferroelectric liquid crystals.
1) Dependence on temperature and applied voltage (V) of ferroelectric liquid crystal DOBAMBC was studied. It has turned out that the switching time, the number of nuclei and the velocity of wall motion all depend only on V/ <tau> , where <tau> is the temperature difference from the SmA-to-SmC transition temperature. From this, it was concluded that the voltage for activation of defects to nuclei is proportional to <tau> .
2) Anomaly that the switching time becomes longer as the applied voltage increases was found in ferroelectric liquid crystals with negative dielectric anisotropy. It turns out that this anomaly can be well reproduced by the equation of motion with the dielectric anisotropy taken into account.
2. Dynamics of disclinations in TN cell.
1) Motion of disclinations given rise to when TN cell is quenched from the isotropic phase to mesophase was observed and analyzed. It has been found that a dynamic scaling rule holds. It is also found that the u-field theory is applicable to such disclination system.
2) The equation of motion for disclinations in a non-orthogonal TN cell has been derived. By observation of the motion of a circular disclination line the validity of the equation was confirmed. It has turned out that the scaling rule such as found in the orthogonal TN cell does not hold in the non-orthogonal TN cell.
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Report
(1 results)
Research Products
(10 results)
