Giant electro-viscous effects in polar fluids with paraelectric–modulated antiferroelectric–ferroelectric phase sequence

IF 5.4 1区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

GIANT Pub Date : 2025-04-01 DOI:10.1016/j.giant.2025.100356

Hiroya Nishikawa , Péter Salamon , Marcell Tibor Máthé , Antal Jákli , Fumito Araoka

引用次数: 0

Abstract

The recently discovered ferroelectric nematic liquid-crystal material DIO exhibits an antiferroelectric (AF) phase, characterized by a sinusoidally modulated structure between the paraelectric (P) and ferroelectric (F) nematic phases. Although these sinusoidal modulated structures associated with the P–AF–F phase sequence is commonly observed in solid ferroelectrics, their presence in soft matter systems is scarce. This study is aimed at examining the macroscopic properties of DIO, identifying unique rheological properties, such as switching between shear thinning and shear thickening behaviors at certain shear rate in the ferroelectric nematic phase. Additionally, a significant electroviscous effect is observed, with the viscosity increasing by 70 times under an ultra-low electric field of 0.15 V µm⁻¹ at the AF–F transition.

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具有准电调制反铁电-铁电相序的极性流体中的巨电粘滞效应

最近发现的铁电向列液晶材料DIO表现出反铁电（AF）相，其特征是在准电(P)和铁电(F)向列相之间的正弦调制结构。虽然这些与P-AF-F相序列相关的正弦调制结构通常在固体铁电体中观察到，但它们在软物质系统中的存在却很少。本研究旨在研究DIO的宏观性质，确定其独特的流变特性，如在铁电向列相中，在一定剪切速率下，在剪切变薄和剪切增厚行为之间切换。此外，还观察到明显的电粘性效应，在0.15 Vµm−1的超低电场下，在AF-F转变过程中，粘度增加了70倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

GIANT Multiple-

CiteScore

8.50

自引率

8.60%

发文量

审稿时长

42 days

期刊介绍： Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.