A bioinspired layered hydrogel actuator vial-ascorbic acid-triggered interfacial self-growth from a stiff hydrogel†

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Rongnian Xu , Yuxin Gao , Yingying Lai , Chengyan Zhang , Wenbo Jia , Qiangbing Wei
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引用次数: 0

Abstract

Stimuli-responsive layered hydrogel actuators are highly attractive for broad applications in soft robots, intelligent devices, etc., owing to their softness, asymmetric responsiveness and deformability. However, current layered hydrogel actuators suffer from serious challenges such as tedious preparation, uncontrollable layer thickness and weak interfacial bonding force. Herein, we put forward a facile and highly efficient self-growing method to prepare a layered hydrogel actuator from a stiff hydrogel substrate by crafting l-ascorbic acid (Vc)-triggered interfacial radical polymerization. The redox reaction between Vc and confined Fe3+ in the stiff hydrogel substrate could produce Fe2+ catalysts, resulting in surface catalytically initiated radical polymerization (SCIRP) at room temperature. Various layered hydrogels were prepared rapidly and the thickness of the grown hydrogel layer can be accurately controlled. The obtained layered hydrogel exhibits asymmetric structural layers consisting of a dense layer and a porous layer, as well as a strong interfacial bonding force of about 250 N m−1 between the porous layer and the stiff substrate. Furthermore, a thermo-responsive layered hydrogel actuator was developed, which showed reversible underwater bending ability in response to temperature changes and can also be designed as a smart manipulator to capture objects underwater. This work provides a novel and feasible approach for the highly efficient and controllable preparation of layered hydrogel actuators, which will find promising applications in the fields of soft robots, intelligent devices, sensors and so on.

Abstract Image

通过 L-抗坏血酸触发硬水凝胶界面自生长实现生物启发式分层水凝胶致动器
由于具有柔软性、非对称响应性和可变形性,刺激响应层状水凝胶致动器在软机器人、智能设备等广泛应用中极具吸引力。然而,目前的层状水凝胶致动器存在制备繁琐、层厚不可控、界面结合力弱等问题。在此,我们提出了一种简便、高效的自生长方法,利用 L-抗坏血酸(Vc)触发的界面自由基聚合,从刚性水凝胶基底制备层状水凝胶致动器。Vc 与硬质水凝胶基底中封闭的 Fe3+ 之间的氧化还原反应可产生 Fe2+ 催化剂,从而在室温下实现表面催化引发的自由基聚合(SCIRP)。各种层状水凝胶均可快速制备,且生长的水凝胶层厚度可精确控制。制备出的层状水凝胶具有由致密层和多孔层组成的不对称结构层,多孔层与坚硬基底之间的界面结合力约为 250 N/m。此外,还开发出了一种热响应层状水凝胶致动器,它具有随温度变化而可逆的水下弯曲能力,还可设计成智能机械手,在水下捕捉物体。这项研究为高效、可控地制备层状水凝胶致动器提供了一种新颖、可行的方法,在软机器人、智能设备、传感器等领域具有广阔的应用前景。
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来源期刊
Polymer Chemistry
Polymer Chemistry POLYMER SCIENCE-
CiteScore
8.60
自引率
8.70%
发文量
535
审稿时长
1.7 months
期刊介绍: Polymer Chemistry welcomes submissions in all areas of polymer science that have a strong focus on macromolecular chemistry. Manuscripts may cover a broad range of fields, yet no direct application focus is required.
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