Fabrication of fibrous dielectric elastomer with enhanced electromechanical performance by incorporating La-doped barium titanate encapsulated carbon nanotubes

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-10-17 DOI:10.1016/j.coco.2025.102620

Xiaofeng Zhang , Sai Wang , Chao Teng , Junyi Liu , Yanfen Zhou , Xinyu Feng , Qiuping Xie , Shuo Luan , Feng-lei Zhou , Liang Jiang , Stephen Jerrams

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引用次数: 0

Abstract

One-dimensional fibrous dielectric elastomers (DEs) can experience uniaxial displacement when electrical signals are applied to them and in consequence, they can imitate the contraction and elongation of artificial muscles. However, it is still a challenge to obtain fibrous DEs possessing high electric field induced deformations. In this work, the fabrication of high dielectric lanthanum-doped barium titanate (La-BTO) encapsulated multiwall carbon nanotubes (MWCNTs) (La-BTO@MWCNTs) incorporated in styrene-ethylene-butylene-styrene copolymer (SEBS) is described. The outcome of this process is a DE with excellent electromechanical performance. The results obtained from testing demonstrated that La doping effectively enhanced the dielectric constant of La-BTO@MWCNTs. A high dielectric constant of 2.77 was achieved for a low amount of La doping (the molar ratio of Ba:La was 100:1). The DE actuator (DEA) containing 2.0 % La-BTO@MWCNTs exhibited a maximum actuated longitudinal strain of 23.12 % and a maximum output force of 25.85 mN for an electric field of 50 V/μm. Furthermore, the SEBS/La-BTO@MWCNTs based DEA provided reliable working stability over 100 voltage cycles from 0 to 5 kV. This text describes a simple and effective new method for developing high performance DEAs to realize applications in the fields of soft robotics, biomedical devices and adaptive systems.

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掺杂镧钛酸钡包封碳纳米管制备具有增强机电性能的纤维介质弹性体

一维纤维介电弹性体（DEs）在电信号作用下可以发生单轴位移，从而可以模拟人工肌肉的收缩和伸长。然而，获得具有高电场致变形的纤维性DEs仍然是一个挑战。在本工作中，描述了在苯乙烯-乙烯-丁烯-苯乙烯共聚物（SEBS）中掺入高介电镧掺杂钛酸钡（La-BTO）封装多壁碳纳米管（MWCNTs）（La-BTO@MWCNTs）的制备。该工艺的结果是机电性能优异的DE。测试结果表明，La掺杂有效地提高了La-BTO@MWCNTs的介电常数。在少量La掺杂（Ba:La的摩尔比为100:1）的情况下，获得了2.77的高介电常数。当电场为50 V/μm时，含有2.0 % La-BTO@MWCNTs的DE致动器（DEA）的最大致动纵向应变为23.12%，最大输出力为25.85 mN。此外，基于SEBS/La-BTO@MWCNTs的DEA在0至5 kV的100个电压周期内提供了可靠的工作稳定性。本文描述了一种简单有效的开发高性能dea的新方法，以实现在软机器人、生物医学设备和自适应系统等领域的应用。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.