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Spontaneous Twist of Ferroelectric Smectic Blocks in Polar Fluids
Advanced Materials ( IF 27.4 ) Pub Date : 2025-03-25 , DOI: 10.1002/adma.202501946
Hiroya Nishikawa 1 , Yasushi Okumura 2 , Dennis Kwaria 1 , Atsuko Nihonyanagi 1 , Fumito Araoka 1
Affiliation  

In soft matter, the polar orientational order of molecules can facilitate the coexistence of structural chirality and ferroelectricity. The ferroelectric nematic (NF) state, exhibited by achiral calamitic molecules with large dipole moments, serves as an ideal model for the emergence of spontaneous structural chirality. This chiral ground state arises from a left‐ or right‐handed twist of polarization due to depolarization effects. In contrast, the ferroelectric smectic state, characterized by a polar lamellar structure with lower symmetry, experiences significantly higher energy associated with layer‐twisting deformations and the formation of domain walls, thus avoiding a continuously twisted layered structure. In this study, two types of achiral molecules (BOE‐NO2 and DIOLT) are reported that possess different molecular structures but exhibit a NF–ferroelectric smectic phase sequence. It is demonstrated that the chiral ground state of NF is inherited in the ferroelectric smectic phases of BOE‐NO2, which features larger dipole moments and a steric hindrance moiety, thereby triggering the formation of the twisted polar smectic blocks.

中文翻译:


极性流体中铁电 Smectic Block 的自发扭曲



在软物质中,分子的极性取向顺序可以促进结构手性和铁电性的共存。铁电向列 (NF) 状态由具有大偶极矩的手性 calamitic 分子表现出来,是自发结构手性出现的理想模型。这种手性基态是由于去极化效应引起的左旋或右旋极化扭曲引起的。相比之下,铁电 smectic 状态以对称性较低的极性层状结构为特征,与层扭曲变形和畴壁形成相关的能量明显更高,从而避免了连续扭曲的层状结构。在这项研究中,报道了两种类型的非手性分子 (BOE-NO2 和 DIOLT),它们具有不同的分子结构,但表现出 NF-铁电 smectic 相序列。结果表明,NF 的手性基态是在 BOE-NO2 的铁电 smectic 相中遗传的,其具有较大的偶极矩和空间位阻部分,从而触发扭曲的极性 smectic 块的形成。
更新日期:2025-03-25
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