Solvent-responsive actuators have been produced from the bilayer of crosslinked soft agar/calcium alginate (Ag/CA) and agar/calcium alginate/polyacrylamide (Ag/CA/PAAm) hydrogels via casting method. The volume of Ag/CA/PAAm hydrogels shrinks drastically in acetone/water mixture and swells massively in deionized (DI) water due to the internally heterogeneous structure. However, there was no observed response of the Ag/CA hydrogels within acetone/water and DI water. Therefore, the Ag/CA-Ag/CA/PAAm composite bilayer hydrogel (bi-gel) bent dramatically with solvent transformation due to internal stress. Furthermore, the bi-gel demonstrated high connection and structure stability within ten repeated swelling/deswelling cycles. The deformations and stress distributions were simulated by the Finite Element Method (FEM). The simulation results indicated the method was excellent to express the bi-gel deformation performance because of the percentage deviations were lower than 5%. Based on the simulation results, the potential of utilization of the designed bi-gel to be gel switcher and cross structured bi-gel was demonstrated and varied. In summary, repeated applicable and solvent sensitive bi-gel with bending angle ±125° were simulated and designed. The exceptional bi-gel with high solvent/volume sensitivity and structure/swelling/deswelling stability showed great application potential to be environmental detectors or sensors.

已通过浇铸法从交联的软琼脂/藻酸钙（Ag / CA）和琼脂/藻酸钙/聚丙烯酰胺（Ag / CA / PAAm）水凝胶的双层中产生了溶剂响应型致动器。由于内部的异质结构，在丙酮/水混合物中，Ag / CA / PAAm水凝胶的体积急剧收缩，而在去离子（DI）水中则大量膨胀。但是，在丙酮/水和去离子水中没有观察到Ag / CA水凝胶的反应。因此，由于内部应力，Ag / CA-Ag / CA / PAAm复合双层水凝胶（bi-gel）随着溶剂转化而急剧弯曲。此外，该双凝胶在十次重复的溶胀/溶胀循环中表现出高连接性和结构稳定性。变形和应力分布通过有限元方法（FEM）进行模拟。仿真结果表明，该方法可以很好地表达双凝胶变形性能，因为其百分比偏差小于5％。基于仿真结果，证明并改变了所设计的双凝胶作为凝胶切换剂和交叉结构化双凝胶的潜力。总之，对可重复使用且对溶剂敏感的弯曲角度为±125°的双凝胶进行了仿真和设计。具有高溶剂/体积敏感性和结构/溶胀/去溶胀稳定性的优异双凝胶显示出其作为环境检测器或传感器的巨大应用潜力。展示和改变了将设计的双胶用作凝胶转换剂和交叉结构双胶的潜力。总之，对可重复使用且对溶剂敏感的，弯曲角度为±125°的凝胶进行了仿真和设计。具有高溶剂/体积敏感性和结构/溶胀/去溶胀稳定性的优异双凝胶显示出其作为环境检测器或传感器的巨大应用潜力。展示和改变了将设计的双胶用作凝胶转换剂和交叉结构双胶的潜力。总之，对可重复使用且对溶剂敏感的弯曲角度为±125°的双凝胶进行了仿真和设计。具有高溶剂/体积敏感性和结构/溶胀/去溶胀稳定性的优异双凝胶显示出其作为环境检测器或传感器的巨大应用潜力。