Electrotunable interfacial friction of polyacrylamide composite hydrogels

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

Composites Communications Pub Date : 2025-08-16 DOI:10.1016/j.coco.2025.102562

Zhongnan Wang , Meiqi Zhang , Xu Zhang , Yao Hu , Beiji Gao , Wanxing Xu , Hongjiang He , Xiaolei Li , Zhaoyu Wang , Peisan (Sharel) E , Bo Gao , Bin Wang , Qiuying Chang , Haihui Lan , Tianyi Han , Chenhui Zhang

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Abstract

Hydrogels exhibit the significant application potential in flexible electronics, biomedical engineering, lubrication technology, robotics, and related fields. The electrotunable interfacial friction of hydrogels provides a conceptual framework for developing intelligent materials. Here, the polyacrylamide (PAAm) composite hydrogels were synthesized via photopolymerization using acrylamide as the monomers. The tribological tests under applied electric potential were conducted using PAAm composite hydrogel discs and silicon nitride balls as the friction pairs, showing the effects of sliding velocity and lubricants on the electrotunable interfacial friction behaviors of the PAAm composite hydrogels. The applied electric potential serves as a critical determinant governing the friction coefficient which is primarily attributed to (1) the differential diffusion kinetics of weakly bound water and non-bound water within the cross-linked polymer networks, and (2) the formation of hydrated cationic layers via strong electro-adsorption of hydrated cations at the interfaces. The findings provide the profound insights into the electrically modulated lubrication mechanisms of the soft contact interfaces from a combined perspective of intrinsic polymer network properties and lubricating molecule-surface interactions.

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聚丙烯酰胺复合水凝胶的电可调界面摩擦

水凝胶在柔性电子、生物医学工程、润滑技术、机器人技术等领域具有重要的应用潜力。水凝胶的电可调界面摩擦为智能材料的开发提供了一个概念框架。本文以丙烯酰胺为单体，采用光聚合法制备了聚丙烯酰胺（PAAm）复合水凝胶。以PAAm复合水凝胶盘和氮化硅球为摩擦副，进行了外加电位下的摩擦学试验，揭示了滑动速度和润滑剂对PAAm复合水凝胶电可调界面摩擦行为的影响。施加的电势是控制摩擦系数的关键决定因素，这主要归因于(1)交联聚合物网络中弱结合水和非结合水的微分扩散动力学，以及(2)通过界面处水合阳离子的强电吸附形成水合阳离子层。该研究结果从聚合物固有网络特性和润滑分子-表面相互作用的角度对软接触界面的电调制润滑机制提供了深刻的见解。

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

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.