Linear dielectric spectroscopy of a polymer network stabilizing a ferroelectric liquid crystal

IF 2.2 4区物理与天体物理 Q4 CHEMISTRY, PHYSICAL

The European Physical Journal E Pub Date : 2025-08-07 DOI:10.1140/epje/s10189-025-00504-4

Mohammed Hanine, Abdelylah Daoudi, Jamal Hemine

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Abstract

In this study, the linear dielectric characterization of a ferroelectric liquid crystal (FLC) stabilized by an anisotropic polymer network (PSFLC) was investigated. The liquid crystal employed in the PSFLC composites exhibited the chiral smectic C phase (SmC*), with a short helical pitch, a high tilt angle, and a high degree of spontaneous polarization. Dielectric spectroscopy was preceded by polarizing optical microscopy, as well as structural and electro-optical studies on pure FLC and PSFLC composites at different polymer concentrations. These studies enabled the determination of the pitch of the helix, the tilt angle, and the spontaneous polarization as a function of temperature and electric field. In the absence of a DC voltage, the dielectric response indicated the relaxation of the Goldstone mode as well as a reduction in tilt angle, spontaneous polarization and relaxation amplitude as the polymer density increased. By integrating the experimental data with the Landau model, the physical parameters, including the torsional elastic constant and rotational viscosity, were identified for pure FLC and PSFLC films. In addition, the impact of polymer density on these physical parameters was explored.

Graphic Abstract

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稳定铁电液晶的聚合物网络的线性介电光谱。

本文研究了各向异性聚合物网络稳定铁电液晶（FLC）的线性介电特性。PSFLC复合材料的液晶表现为手性近晶C相（SmC*），具有较短的螺旋节距、较大的倾斜角度和较高的自发极化程度。在电介质光谱研究之前，进行了偏光显微镜研究，并对不同聚合物浓度下纯FLC和PSFLC复合材料进行了结构和电光研究。这些研究能够确定螺旋的螺距，倾斜角，以及自发极化作为温度和电场的函数。在没有直流电压的情况下，随着聚合物密度的增加，介质响应显示出Goldstone模式的弛豫以及倾角、自发极化和弛豫幅度的减小。通过将实验数据与朗道模型相结合，确定了纯FLC和PSFLC薄膜的扭转弹性常数和旋转粘度等物理参数。此外，还探讨了聚合物密度对这些物理参数的影响。

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

The European Physical Journal E CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

2.60

自引率

5.60%

发文量

审稿时长

3 months

期刊介绍： EPJ E publishes papers describing advances in the understanding of physical aspects of Soft, Liquid and Living Systems. Soft matter is a generic term for a large group of condensed, often heterogeneous systems -- often also called complex fluids -- that display a large response to weak external perturbations and that possess properties governed by slow internal dynamics. Flowing matter refers to all systems that can actually flow, from simple to multiphase liquids, from foams to granular matter. Living matter concerns the new physics that emerges from novel insights into the properties and behaviours of living systems. Furthermore, it aims at developing new concepts and quantitative approaches for the study of biological phenomena. Approaches from soft matter physics and statistical physics play a key role in this research. The journal includes reports of experimental, computational and theoretical studies and appeals to the broad interdisciplinary communities including physics, chemistry, biology, mathematics and materials science.