| Project/Area Number |
19K15625
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 35020:Polymer materials-related
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| Research Institution | Tohoku University |
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Principal Investigator |
ZHU HUIE 東北大学, 工学研究科, 助教 (70754539)
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | Ferroelectric polymers / Langmuir-Blodgett films / Nanoparticles / Crystallization control / Crystal size / Energy storage / Ferroelectric polymer / Nanoconfinement / Interface / 2-Dimensional nanofilm / Crystallization / Energy storage density |
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| Outline of Research at the Start |
Crystallization control of high-k poly(vinylidene fluoride) (PVDF) toward selective crystal form with small domain size is effective on suppression of dielectric loss but remains challenging. The present research will pursue a mechanistic understanding of the selective PVDF crystallization toward β crystals at the air-water interface and clarify how crystal defects such as comonomers in PVDF influence the crystallization and how the crystals respond to the external electric field in 2D-confinement structures.
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| Outline of Final Research Achievements |
In this study, we succeeded in simultaneously controlling nanostructuring and crystallization of ferroelectric polymers at the air-water and liquid-liquid interfaces. From the confinement effect of the interface, it is shown that the prepared ferroelectric polymer ultrathin film and nanoparticles contain about 98% or more of the ferroelectric phase, and the crystal domain is in the range of 3-6 nanometers, which are much smaller than that of polymer bulks. Therefore, the polar ferroelectric domains are easily aligned under the external electric field and return to the original state as soon as the external electric field is turned off. In addition, capacitor devices were prepared and the energy storage behavior was clearly investigated.
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| Academic Significance and Societal Importance of the Research Achievements |
環境に優しく高効率のエネルギー貯蔵が注目されている。圧力、熱、電気に応答する強誘電性高分子は、さまざまな場面でエネルギーを蓄えることができる。デバイスのパフォーマンスを向上させるため、結晶特性を適切に制御し、デバイスのパフォーマンスとの相関関係を深く理解する必要がある。本研究では、界面での強誘電性高分子の結晶化とナノ構造化の制御を同時にでき、デバイス特性との関係を調べた。
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