Shibaev Andrey V, Smirnova Maria E, Kessel Darya E, Bedin Sergey A, Razumovskaya Irina V, Philippova Olga E
Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russia.
Institute of Physics, Technology and Informational Systems, Moscow Pedagogical State University, 119435 Moscow, Russia.
Nanomaterials (Basel). 2021 May 12;11(5):1271. doi: 10.3390/nano11051271.
The development of actuators with remote control is important for the construction of devices for soft robotics. The present paper describes a responsive hydrogel of nontoxic, biocompatible, and biodegradable polymer carboxymethyl hydroxypropyl guar with dynamic covalent cross-links and embedded cobalt ferrite nanoparticles. The nanoparticles significantly enhance the mechanical properties of the gel, acting as additional multifunctional non-covalent linkages between the polymer chains. High magnetization of the cobalt ferrite nanoparticles provides to the gel a strong responsiveness to the magnetic field, even at rather small content of nanoparticles. It is demonstrated that labile cross-links in the polymer matrix impart to the hydrogel the ability of self-healing and reshaping as well as a fast response to the magnetic field. In addition, the gel shows pronounced pH sensitivity due to pH-cleavable cross-links. The possibility to use the multiresponsive gel as a magnetic-field-triggered actuator is demonstrated.
具有远程控制功能的致动器的开发对于软机器人设备的构建至关重要。本文描述了一种由无毒、生物相容且可生物降解的聚合物羧甲基羟丙基瓜尔胶制成的响应性水凝胶，其具有动态共价交联并嵌入了钴铁氧体纳米颗粒。这些纳米颗粒显著增强了凝胶的机械性能，充当聚合物链之间额外的多功能非共价连接。钴铁氧体纳米颗粒的高磁化率使凝胶即使在纳米颗粒含量相当低的情况下也能对磁场产生强烈响应。结果表明，聚合物基质中不稳定的交联赋予水凝胶自我修复和重塑的能力以及对磁场的快速响应。此外，由于pH可裂解交联，该凝胶表现出明显的pH敏感性。展示了将这种多响应凝胶用作磁场触发致动器的可能性。
