Study on the choresteric-smectic isothermal phase transition inducedby application of electric field

• Project/Area Number: 19350096
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Functional materials/Devices
• Research Institution: Tokyo University of Science
• Principal Investigator: SASAKI Takeo Tokyo University of Science, 理学部, 准教授 (80261501)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥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)
• 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

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.

Research Products

• [Journal Article] "Two-stage Grafting" to Polyethylene Fiber by Radiation-induced Graft Polymerization and ATRP (2010)
  • Author(s): M.Komatsu, T.Kawakami, J.Kanno, T.Sasaki
  • Journal Title: J.Appl.Polym.Sci. 115 Pages: 3369-3375
  • Peer Reviewed
• [Journal Article] Photorefractive Effect of Polymer-Stabilized Ferroelectric Liquid Crystals (2009)
  • Author(s): T. Sasaki, Y. Nakazawa
  • Journal Title: J. Phys. Chem. C 113 Pages: 5792-5798
• [Journal Article] Photorefractive Effect of Polymer-Stabilized Ferroelectric Liquid Crystals (2009)
  • Author(s): T.Sasaki, Y.Nakazawa
  • Journal Title: J.Phys.Chem.C 113 Pages: 5792-5798
  • Peer Reviewed
• [Journal Article] Photorefractive Effect of Ferroelectric Liquid Crystals with Application of a Biased Alternating Electric Field (2008)
  • Author(s): N. Moriya, T. Sasaki
  • Journal Title: Mol. Cryst. Liq. Cryst. 482 Pages: 33-41
• [Journal Article] Photorefractive Effect of Ferroelectric Liquid Crystals with Application of a Biased Alternating Electric Field (2008)
  • Author(s): N. Moriya, and T. Sasaki
  • Journal Title: Mol. Cryst. Liq. Cryst. 482 Pages: 33-41
  • Peer Reviewed
• [Journal Article] Influence of Rubbing Condition of Polyimide Alignment Layer on Optical Anisotropy of Immobilized Liquid Crystal Film (2007)
  • Author(s): M. Yamahara, M. Nakamura, N. Koide, T. Sasaki
  • Journal Title: Liq. Cryst. 34 Pages: 381-387
• [Journal Article] Relationship between Molecular Orientation of Rubbed Polyimide Alignment Layer and Immobilized Liquid Crystal Film Coated on The Alignment Layer (2007)
  • Author(s): M. Yamahara, M. Nakamura, N. Koide, T. Sasaki
  • Journal Title: Mol. Cryat. Liq. Cryst. 466 Pages: 39-52
• [Journal Article] Relationship between Optical Properties of Immobilized Liquid Crystal Film and that of Polyimide Alignment Layer (2007)
  • Author(s): M. Yamahara, M. Nakamura, N. Koide, T. Sasaki
  • Journal Title: Mol. Cryat. Liq. Cryst. 473 Pages: 3-14
• [Journal Article] Photorefractive Effect of Ferroelectric Liquid Crystals with Application of Alternating Electric field (2007)
  • Author(s): T. Sasaki, N. Moriya, Y. Iwasaki
  • Journal Title: J. Phys. Chem. C 111 Pages: 17646-17652
• [Journal Article] Photorefractive Effect of Ferroelectric Liquid Crystals with Application of Alternating Electric field (2007)
  • Author(s): T. Sasaki, N. Moriya, and Y. Iwasaki
  • Journal Title: J. Phys. Chem. C 111 Pages: 17646-17652
  • Peer Reviewed
• [Journal Article] Photoinduced Depolymerization of Poly(olefin sulfone)s Possessing Photo-base Generating Groups in the Side-chain (2007)
  • Author(s): H. Yaguchi, and T. Sasa
  • Journal Title: Macromolecules 40 Pages: 9332-9338
  • Peer Reviewed
• [Presentation] 高分子安定化コレステリック液晶のplaner/focalconic転移における電界応答挙動の解析 (2009)
  • Author(s): 鳥海裕貴、佐々木健夫
  • Organizer: 日本液晶学会討論会
  • Place of Presentation: 東京農工大
  • Year and Date: 2009-09-16
• [Presentation] 高分子安定化コレステリック液晶の planer/fbcalconic 転移における電界応答挙動の解析 (2009)
  • Author(s): 鳥海裕貴, 佐々木健夫
  • Organizer: 日本液晶学会討論会
  • Place of Presentation: 東京農工大
  • Year and Date: 2009-09-14
• [Presentation] キラルネマチック相の電界応答に及ぼす配向処理条件 (2008)
  • Author(s): 浜本浩史, 佐々木健夫
  • Organizer: 日本液晶学会討論会
  • Place of Presentation: キャンパスプラザ京都
  • Year and Date: 2008-09-17
• [Presentation] コレステリック液晶のフレクソエレクトリック効果に及ぼす配向条件の影響 (2008)
  • Author(s): 浜本浩史、佐々木健夫
  • Organizer: 第57回高分子学会年次大会
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2008-05-29
• [Presentation] コレステリック液晶のフレクソェレクトリック効果に及ぼす配向条件の影響 (2008)
  • Author(s): 浜本浩史, 佐々木健夫
  • Organizer: 第57回高分子学会年次大会
  • Place of Presentation: パシフイコ横浜
  • Year and Date: 2008-05-29
• [Presentation] N*相における特異的電界挙動 (2007)
  • Author(s): 赤堀陽介、佐々木健夫
  • Organizer: 日本液晶学会討論会
  • Place of Presentation: 東工大
  • Year and Date: 2007-09-12
• [Presentation] キラルネマチック相の電界応答に及ぼす配向処理の影響 (2007)
  • Author(s): 浜本浩史、佐々木健夫
  • Organizer: 日本液晶学会討論会
  • Place of Presentation: 東工大
  • Year and Date: 2007-09-12
• [Presentation] キラルネマチック相の電界応答に及ぼす配向処理の影響 (2007)
  • Author(s): 浜本浩史、佐々木健夫
  • Organizer: 日本液晶学会討論会
  • Place of Presentation: 東京工業大学
  • Year and Date: 2007-09-12
• [Presentation] コレステリック相において電界応答に及ぼす分子構造の影響 (2007)
  • Author(s): 黒川友昭、佐々木健夫
  • Organizer: 日本液晶学会討論会
  • Place of Presentation: 東京工業大学
  • Year and Date: 2007-09-12
• [Presentation] N*相における特異的電界挙動 (2007)
  • Author(s): 赤堀陽介、佐々木健夫
  • Organizer: 日本液晶学会討論会
  • Place of Presentation: 東京工業大学
  • Year and Date: 2007-09-12
• [Presentation] 等温的コレステリックースメクチック電界誘起相転移 (2007)
  • Author(s): 赤堀陽介、佐々木健夫
  • Organizer: 第56回高分子学会年次大会
  • Place of Presentation: 京都国際会館
  • Year and Date: 2007-05-29
• [Book] 自己組織化ハンドブック複合材料-有機フォトリフラクティブマテリアル (2009)
  • Author(s): 佐々木健夫
  • Total Pages: 937
  • Publisher: NTS
• [Book] 光機能性高分子材料の新たな潮流 (2008)
  • Author(s): 佐々木健夫
  • Total Pages: 357
  • Publisher: 液晶系フォトリフラクティブ材料
• [Remarks]
  • URL: http://www.rs.kagu.tus.ac.jp/~photoref/index.htm