进动
杰纳斯
传质
旋转(数学)
物理
纺纱
材料科学
纳米流体
工作(物理)
扩散
聚苯乙烯
机械
纳米技术
凝聚态物理
热力学
复合材料
纳米颗粒
聚合物
几何学
数学
作者
Kang Xiong,Jinwei Lin,Qiang Chen,Tianyu Gao,Leilei Xu,Jianguo Guan
出处
期刊:Matter
[Elsevier]
日期:2023-03-01
卷期号:6 (3): 907-924
被引量:5
标识
DOI:10.1016/j.matt.2023.01.005
摘要
Self-driven micro/nanomotors (MNMs) can generate “on-the-fly” mass transfer, significantly advancing micro/nanofluid technologies. However, the presence of at least one symmetric axis regulates them to implement either translation or rotation, confining the enhancement efficiency for mass transfer. Here, we report axis-asymmetric hollow bowl-shaped Janus micromotors that can perform unusual precession like a spinning top and thus intriguingly enhance liquid medium convection in a large area. They are formed by self-collapse of polystyrene (PS)/platinum (Pt) hollow Janus microspheres adjacent to the boundary between the two hemispheres of PS and Pt caused by the osmotic pressure with the assistance of stirring. The synchronistic self-rotation and translation modulated by the fuel concentration and depression degree can multiply solute mixing and diffusion efficiencies by several times compared with conventional Janus counterparts. This work demonstrates a novel motion mode of self-driven MNMs, precession that greatly enhances micro-convection and rapid diffusion of liquid medium.
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