Programmable shape deformation actuated bilayer hydrogel based on mixed metal ions

文献类型： 外文期刊

第一作者： Liu, Jianzhi

作者： Liu, Jianzhi;Zhang, Zipeng;Liu, Zhibang;Yu, Yueqin;Yu, Yueqin;Miao, Junkui

作者机构：

关键词： Bilayer hydrogel; Mixed metal ions; Programmable deformation; Synergistic effect; Actuators

期刊名称：EUROPEAN POLYMER JOURNAL （ 影响因子：5.546； 五年影响因子：5.006 ）

ISSN： 0014-3057

年卷期： 2022 年 175 卷

页码：

收录情况： SCI

摘要： The intelligent hydrogel actuators that respond to temperature have great application prospects in many fields. At the same time, the intelligent hydrogel actuators still have challenges in driving force, deformation intensity, and programming deformation. Herein, we fabricated a bilayer hydrogel actuator using a two-step photopolymerization method, which consists of a poly(N-isopropylacrylamide)-chitosan-N-2-hydroxypropyl trimethylammonium chloride (PNIPAm-HACC) layer with an LCST-type volume phase change and an alginatepolyacrylamide (SA-PAm) layer. We employed mixed metal ions (trivalent/divalent cations) to cross-link alginate-based hydrogels to construct two-dimensional and three-dimensional cross-linked structure units, resulting in a synergistic effect. The Zn2+/Fe3+(1:1)-SA-PAm/PNIPAm-HACC bilayer-actuated hydrogels have excellent antibacterial properties, shape fixation (85.4 %), fatigue resistance, and reversibility, and showed rapid, reversible, and reproducible thermoresponsive bending/unbending properties, which can be prepared as an actuator, such as a gripper to capture, transport, and release an object, or a temperature-controlled device to turn on and off indicator lights. Overall, this hybrid ion-crosslinked bilayer hydrogel can provide new insights into the design and fabrication of smart actuators.

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