2024年 04期

Motion Behaviors of Palladium-Platinum Based Janus Micromotors


摘要(Abstract):

为了研究双金属基微马达的驱动机制,利用磁控溅射技术制备聚苯乙烯(PS)@钯Pd-铂Pt双面神微马达,采用扫描电子显微镜和光学显微镜表征该微马达的结构、形貌和运动行为,并通过对比实验和数值模拟推测验证该微马达驱动机制。结果表明:PS@Pd-Pt微马达由Pd、 Pt双金属层在PS微球表面半包覆形成,具有双面神结构,直径约为2μm; PS@Pd-Pt双面神微马达在过氧化氢H_2O_2溶液中一开始朝着PS侧正向运动,随后速度逐渐减小,然后发生自发转向朝着Pd-Pt双金属侧反向运动;该微马达正向运动的驱动机制为Pt催化H_2O_2产生的非离子型自扩散泳以及Pt层厚度不均匀导致的自电泳共同作用,反向运动的机制为外部Pt与内部Pd双金属形成的自电泳作用。

关键词(KeyWords): 微马达;双面神结构;驱动机制;自电泳;自扩散泳

基金项目(Foundation): 国家自然科学基金项目(21975195)

作者(Author): 魏敬武,张铭辉,林金卫,许蕾蕾,官建国

DOI: 10.13349/j.cnki.jdxbn.20240530.003

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