2020年8月13日
Mixed Columnar Assembly of Ferroelectric and Antiferroelectric Benzene Derivatives Bearing Multiple-CONHC14H29 Chains
Journal of Physical Chemistry B
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- ,
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- 巻
- 124
- 号
- 32
- 開始ページ
- 7067
- 終了ページ
- 7074
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.jpcb.0c03365
The discotic hexagonal columnar (Colh) liquid crystalline phases of simple benzene derivatives bearing-CONHC14H29 chains at the 1-, 3-, and 5-positions (3BC) and 1-, 2-, 4-, and 5-positions (4BC) display ferroelectricity and antiferroelectricity, respectively. The phase transition behavior, molecular assembly structures, dielectric response, and ferroelectric properties of their mixed crystals [(3BC)1-x(4BC)x] were evaluated to clarify the nanoscaling effect on the collective inversion of the one-dimensional (1D) N-H···O= hydrogen bonding interaction observed in the (3BC)∞ chain. A small quantity of 4BC doped into 3BC (x ≤ 0.03) maintained the ferroelectric polarization-electric field response (P-E) in the (3BC)1-x(4BC)x chains, where the antiferroelectric 4BC molecules in the ferroelectric 3BC column act as a pinning potential site for dipole inversion. On the contrary, a relatively large amount of 4BC doping (x ≥ 0.1) forms a domain separation state between the hydrogen-bonded (3BC)∞ and (4BC)∞ columns, in which the ferroelectric P-E hysteresis completely disappeared. The correlation length for the appearance of ferroelectricity in the 1D column was estimated to be ∼40 nm in the Colh liquid crystalline phase of 3BC.
- ID情報
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- DOI : 10.1021/acs.jpcb.0c03365
- ISSN : 1520-6106
- eISSN : 1520-5207