1996 年度実績報告書

液晶における反強誘電相の発現機構に関する分子運動論的研究

研究課題

研究課題/領域番号	06102005
研究機関	東京工業大学
研究代表者	福田敦夫東京工業大学, 工学部, 教授 (10013484)
研究分担者	高西陽一東京工業大学, 工学部, 助手 (80251619) 石川謙東京工業大学, 工学部, 助教授 (10176159) 竹添秀男東京工業大学, 工学部, 教授 (10108194)
キーワード	液晶 / 反強誘電性 / 無閾反強誘電性 / 赤外分光 / NMR / CD分光 / V字型スイッチング / ディスプレイ
研究概要	研究実施計画にしたがい下記の9点を明らかにするとともに,成果報告書をまとめ,公開シンポジウムを開催した. 1.H7(1995)年度購入したCD分光計により,SC_α^相の螺旋構造が動的なものであることを明らかにし,SC_α^はC-配向ベクトル場の転傾が熱的に励起されている相であると結論した. 2.温度や周波数を変えるとスイッチングが3安定からV字型に移り変わる系を見出し,V字スイッチングが界面誘起の無閾反強誘電性に起因することを明らかにした. 3.界面の影響が少ない自己保持膜を用いて福次相を系統的に研究し,山下のANNI+J_3モデルが妥当なことを明らかにして,その無秩序相が固有の無閾反強誘電性を示す可能性を示唆した. 4.重水素化試料を用いた偏光ラマン・赤外により,キラルアルキル鎖ばかりでなくキラル部-CH_3,-CF_3も骨格部分子長軸から約マジック角で突出していることを明らかにし,またキラルアルキル鎖の束縛回転を確認した. 5.^<13>CでラベルしたTFMHPOBC試料を用い,偏光赤外によりキラル部および骨格部カルボニル基の束縛回転をそれぞれ独立に確認した. 6.重水素化試料を用いたNMRにより,キラルアルキル鎖の運動状態がアキラルアルキル鎖とは全く異なっており,SA相においてさえも平均的鎖軸まわりに2軸性であること明らかにした. 7.^<13>C NMRによりキラルアルキル鎖の歳差運動が集団的ではないかと考えられるに至り,詳細は今後の課題である. 8.キラルアルキル鎖を連結したダイマーを使い,SC_A^*相発現に双極子-双極子間の電気的相互作用が重要であることを示した. 9.5T超電導マグネットにより導入し配向セルの作製を容易にするとともに,配向機構の解明,配向を乱す欠陥構造について研究した.

研究成果
(20件)

すべてその他

すべて文献書誌 (20件)

[文献書誌] K.Shirota,M.Yaginuma,T.Sakai,K.Ishikawa,H.Takezoe and A.Fukuda: "Orientation Relationship among Polyimide Alignment Layer,Liquid Crystal Monolayer,and Bulk Pretilt Angle" Appl.Phys.Lett.,. 69. 164-166 (1996)
[文献書誌] S.S.Seomun,T.Gouda,T.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda: "Electrooptic Property of a Binary Mixt;ure of Ferroelectric and Antiferroelectric Chiral Compounds Showing Thresholdless V-Shaped Switching" Extended Abstracts of The Third International Display Workshops.(1996)
[文献書誌] S.Inui,N.Iimura,T.Suzuki,H.Iwane,K.Miyachi,Y.Takanishi and A.Fukuda: "Thresholdless Antiferroelectricity in Liquid Crystals and its Application to Displays" J.Mater.Chem.6. 671-673 (1996)
[文献書誌] Y.Suzuki,T.Isozaki,S.Hashimoto,T.Kusumoto,T.Hiyama,Y.Takanishi,H.Takezoe and A.Fukuda: "Stability of the Antiferroelectric Phase in Dimeric Liquid Crystals Having Two Chiral Centres with CF_3 or CH_3 Groups ; Evaluation of Conformational and Electric Interactions" J.Mater.Chem.6. 753-760 (1996)
[文献書誌] Y.Takanishi,A.Iida,K.Ishikawa,H.Takezoe and A.Fukuda: "Spontaneous Layer Twist in a Stripe Texture of Chiral Ferroelectric Smectics Observed by Synchrotron X-Ray Microdiffraction" Jpn.J.Appl.Phys.35. 683-687 (1996)
[文献書誌] K.Shirota,M.Yaginuma,T.Sakai,K.Ishikawa,H.Takezoe and A.Fukuda: "Surface Orientation of Cyanobiphenyl Liquid Crystal Monolayer and Pretilt Angle under Various Rubbing Strengths" Jpn.J.Appl.Phys.35. 2275-2279 (1996)
[文献書誌] T.Sakai,K.Shirota,T.Yamada,H.Hoshi,K.Ishikawa,H.Takezoe and A.Fukuda: "Orientation of Liquid Crystal Molecules on Side-Chain Polyimide Alignment Layer Studied by Second-Harmonic Generation Interferometry" Jpn.J.Appl.Phys.35. 296-299 (1996)
[文献書誌] S.Yoshida,B.Jin,Y.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda and S.Miyajima: "Orientational Change of the Trifluoromethyl Group at the Ferroelectric-Antiferroelectric Transition Observed by NMR Spectrocscopy" Mol.Cryst.Liq.Cryst.C1P,ILCC16. (in press). 128 (1996)
[文献書誌] S.S.Seomun,Y.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda,C.Tanaka,T.Fujiyama,T.Maruyama and 〜: "Thresholdless Switching in Homogeneous Cells and Antiferroelectric Conoscopic Figures in Free-Standing Films as Observed in a Binary SC^*-Like Mixture" Mol.Cryst.Liq.Cryst.C1P,ILCC16. (in press). 131 (1996)
[文献書誌] H.Yin,B.Jin,Y.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda and M.Kakimoto: "Synthesis and Physical Properties of TFMHPNCBC-d" Mol.Cryst.Liq.Cryst.C3P,ILCC16. (in press). 211 (1996)
[文献書誌] B.Jin,H.Yin,S.Yoshida,Y.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda and M.Kakimoto: "Synthesis of Deuterated MHPOBC-d_<43> and MHPOBC-d_3 and Behavior of Methyl Group near Chiral Carbon as Observed by Polarized FT-IR and NMR Spectroscopy" Mol.Cryst.Liq.Cryst.D3P,ILCC16. (in press). 218 (1996)
[文献書誌] A.Fukuda,S.S.Seomun,T.Kakahashi,Y.Takanishi and K.Ishikawa: "Tilting Correlation in Adjacent Layers and Possible Thresholdless Antiferroelectricity in SC^*-like Liquid Crystals" Mol.Cryst.Liq.Cryst.E2.I,ILCC16. (in press). 155 (1996)
[文献書誌] B.Jin,Z.Ling,Y.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda,M.Kakimoto and T.Kitazume: "Obliquely Projecting Chiral Alkyl Chains and Their Precession around the Long Core Axes in the Smectic-A Phase of an Antiferroelectric Liquid Crystal" Phys.Rev.E,. 53. R4298-R4295 (1996)
[文献書誌] K.Ema,H.Yao,A.Fukuda,Y.Takanishi and H.Takezoe: "Non-Landau Critical Behavior of Heat Capacity at the Smectic-A-Smectic-C_α^* Transition of the Antiferroelectric Liquid Crystal Methylheptyloxycarbonylphenyl Octyloxycalbonylbiphenyl Carboxylate" Phys.Rev.E,. 54. 4450-4453 (1996)
[文献書誌] K.Itoh,M.Kabe,K.Miyachi,Y.Takanishi,K.Ishikawa,H.Takezoe and A.Fukuda: "Devil's Staircase between antiferroelectric SC_A^* and Ferroelectric SC^* in Liquid Crystals Observed in Free-Standing Films under Temperature Gradients" J.Mater.Chem.(in press). (1997)
[文献書誌] S.S.Seomun,Y.Takanishi,K.Ishikawa,H.Takezoe and A.Fukuda: "Evolution of Switching Characteristics from Tristable to V-Shaped in an Antiferroelectric Liquid Crystal" Jpn.J.Appl.Phys.(submitted). (1997)
[文献書誌] .Hiraoka,Y.Uematsu,H.Takezoe and A.Fukuda: "Molecular Fluctuations in Smectic Phases Possessing Antiferroeletric Ordering" Jpn.J.Appl.Phys.35. 6157-6161 (1997)
[文献書誌] S.Asahina,M.Sorai,A.Fukuda,H.Takezoe,K.Furukawa,K.Terashima,Y.Suzuki and 〜: "Heat Capacities and Phase Transitions of the Antiferroelectric Liquid Crystala MHPOBC and MHPOCBC" Liq.Cryst.(in press). (1997)
[文献書誌] K.Miyachi,Y.Takanishi,K.Ishikawa,H.Takezoe,and A.Fukuda: "Relaxation Time of Molecular Rotation about its Long Axis in the Smectic-A Phase of Ferroelectric and Antiferroelectric Liquid Crystals as Observed by Picosecond Optical Kerr Effect" Phys.Rev.E,. 55(in press). (1997)
[文献書誌] K.Yamada,Y.Takanishi,H.Takezoe and A.Fukuda: "Helical Structure in the Smectic C_α^* Phase Studied by Circular Dichroism" Phys.Rev.E,. 56(submitted). (1997)

1996 年度 実績報告書

液晶における反強誘電相の発現機構に関する分子運動論的研究

研究代表者

福田 敦夫 東京工業大学, 工学部, 教授 (10013484)

研究成果

[文献書誌] K.Shirota,M.Yaginuma,T.Sakai,K.Ishikawa,H.Takezoe and A.Fukuda: "Orientation Relationship among Polyimide Alignment Layer,Liquid Crystal Monolayer,and Bulk Pretilt Angle" Appl.Phys.Lett.,. 69. 164-166 (1996)

[文献書誌] S.S.Seomun,T.Gouda,T.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda: "Electrooptic Property of a Binary Mixt;ure of Ferroelectric and Antiferroelectric Chiral Compounds Showing Thresholdless V-Shaped Switching" Extended Abstracts of The Third International Display Workshops.(1996)

[文献書誌] S.Inui,N.Iimura,T.Suzuki,H.Iwane,K.Miyachi,Y.Takanishi and A.Fukuda: "Thresholdless Antiferroelectricity in Liquid Crystals and its Application to Displays" J.Mater.Chem.6. 671-673 (1996)

[文献書誌] Y.Takanishi,A.Iida,K.Ishikawa,H.Takezoe and A.Fukuda: "Spontaneous Layer Twist in a Stripe Texture of Chiral Ferroelectric Smectics Observed by Synchrotron X-Ray Microdiffraction" Jpn.J.Appl.Phys.35. 683-687 (1996)

[文献書誌] K.Shirota,M.Yaginuma,T.Sakai,K.Ishikawa,H.Takezoe and A.Fukuda: "Surface Orientation of Cyanobiphenyl Liquid Crystal Monolayer and Pretilt Angle under Various Rubbing Strengths" Jpn.J.Appl.Phys.35. 2275-2279 (1996)

[文献書誌] T.Sakai,K.Shirota,T.Yamada,H.Hoshi,K.Ishikawa,H.Takezoe and A.Fukuda: "Orientation of Liquid Crystal Molecules on Side-Chain Polyimide Alignment Layer Studied by Second-Harmonic Generation Interferometry" Jpn.J.Appl.Phys.35. 296-299 (1996)

[文献書誌] S.Yoshida,B.Jin,Y.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda and S.Miyajima: "Orientational Change of the Trifluoromethyl Group at the Ferroelectric-Antiferroelectric Transition Observed by NMR Spectrocscopy" Mol.Cryst.Liq.Cryst.C1P,ILCC16. (in press). 128 (1996)

[文献書誌] H.Yin,B.Jin,Y.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda and M.Kakimoto: "Synthesis and Physical Properties of TFMHPNCBC-d" Mol.Cryst.Liq.Cryst.C3P,ILCC16. (in press). 211 (1996)

[文献書誌] A.Fukuda,S.S.Seomun,T.Kakahashi,Y.Takanishi and K.Ishikawa: "Tilting Correlation in Adjacent Layers and Possible Thresholdless Antiferroelectricity in SC^*-like Liquid Crystals" Mol.Cryst.Liq.Cryst.E2.I,ILCC16. (in press). 155 (1996)

[文献書誌] B.Jin,Z.Ling,Y.Takanishi,K.Ishikawa,H.Takezoe,A.Fukuda,M.Kakimoto and T.Kitazume: "Obliquely Projecting Chiral Alkyl Chains and Their Precession around the Long Core Axes in the Smectic-A Phase of an Antiferroelectric Liquid Crystal" Phys.Rev.E,. 53. R4298-R4295 (1996)

[文献書誌] K.Ema,H.Yao,A.Fukuda,Y.Takanishi and H.Takezoe: "Non-Landau Critical Behavior of Heat Capacity at the Smectic-A-Smectic-C_α^* Transition of the Antiferroelectric Liquid Crystal Methylheptyloxycarbonylphenyl Octyloxycalbonylbiphenyl Carboxylate" Phys.Rev.E,. 54. 4450-4453 (1996)

[文献書誌] K.Itoh,M.Kabe,K.Miyachi,Y.Takanishi,K.Ishikawa,H.Takezoe and A.Fukuda: "Devil's Staircase between antiferroelectric SC_A^* and Ferroelectric SC^* in Liquid Crystals Observed in Free-Standing Films under Temperature Gradients" J.Mater.Chem.(in press). (1997)

[文献書誌] S.S.Seomun,Y.Takanishi,K.Ishikawa,H.Takezoe and A.Fukuda: "Evolution of Switching Characteristics from Tristable to V-Shaped in an Antiferroelectric Liquid Crystal" Jpn.J.Appl.Phys.(submitted). (1997)

[文献書誌] .Hiraoka,Y.Uematsu,H.Takezoe and A.Fukuda: "Molecular Fluctuations in Smectic Phases Possessing Antiferroeletric Ordering" Jpn.J.Appl.Phys.35. 6157-6161 (1997)

[文献書誌] S.Asahina,M.Sorai,A.Fukuda,H.Takezoe,K.Furukawa,K.Terashima,Y.Suzuki and 〜: "Heat Capacities and Phase Transitions of the Antiferroelectric Liquid Crystala MHPOBC and MHPOCBC" Liq.Cryst.(in press). (1997)

[文献書誌] K.Miyachi,Y.Takanishi,K.Ishikawa,H.Takezoe,and A.Fukuda: "Relaxation Time of Molecular Rotation about its Long Axis in the Smectic-A Phase of Ferroelectric and Antiferroelectric Liquid Crystals as Observed by Picosecond Optical Kerr Effect" Phys.Rev.E,. 55(in press). (1997)

[文献書誌] K.Yamada,Y.Takanishi,H.Takezoe and A.Fukuda: "Helical Structure in the Smectic C_α^* Phase Studied by Circular Dichroism" Phys.Rev.E,. 56(submitted). (1997)

1996 年度実績報告書

福田敦夫東京工業大学, 工学部, 教授 (10013484)