Bai Jingyuan, Wang Xuejiao, Zhang Meilin, Zhang Jin, Chen Xiaolin, An Yanan, Guan Renguo
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.
Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, Dalian 116028, China.
Materials (Basel). 2022 Feb 14;15(4):1412. doi: 10.3390/ma15041412.
Novel porous magnetic soft materials (pMSMs) based on a poly (vinyl alcohol) (PVA) porous matrix filled with CuNi nanoparticles (NPs) of around 70 nm were synthesized. Initially, magnetic CuNi NPs were fabricated by the reduction of Ni and Cu ions with hydrazine hydrate in ethylene glycol medium in the absence of other capping agents. The pMSMs are subsequently fabricated by mixing CuNi NPs and PVA through freezing-drying process. The as-obtained pMSMs can respond to a magnetic field, i.e., the compressive modulus increase under a magnetic field of 0.23 T. The experimental results indicate that CuNi NPs can easily move to form chain-like structures under the application of a magnetic field. A combination of direct observation and finite element modeling has shown that under the influence of a magnetic field, chain-like aggregates of CuNi NPs lead to self-reinforcement of the pMSMs and, thus, to the increased compressive modulus. From a technological point of view, these materials with good magnetic responsiveness and moderate mechanical strength have potential applications in artificial muscle, soft actuators and drug release, to name a few.
合成了一种新型的多孔磁性软材料（pMSMs），其基于填充有直径约70nm的CuNi纳米颗粒（NPs）的聚乙烯醇（PVA）多孔基质。首先，在没有其他封端剂的情况下，通过在乙二醇介质中用水合肼还原Ni和Cu离子来制备磁性CuNi NPs。随后，通过冷冻干燥过程将CuNi NPs和PVA混合来制备pMSMs。所获得的pMSMs能够对磁场做出响应，即在0.23T的磁场下压缩模量增加。实验结果表明，在施加磁场时，CuNi NPs能够轻松移动以形成链状结构。直接观察和有限元建模相结合表明，在磁场的影响下，CuNi NPs的链状聚集体导致pMSMs的自增强，从而使压缩模量增加。从技术角度来看，这些具有良好磁响应性和适度机械强度的材料在人工肌肉、软致动器和药物释放等方面具有潜在应用。
