Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (2): 20220442.doi: 10.7503/cjcu20220442

• Polymer Chemistry • Previous Articles     Next Articles

Magnetic Gradient Slippery Surfaces with Shape Memory Property for Smart Sliding Control of Superparamagnetic Droplet

HU Dongdong1, LAI Hua1(), LIU Yuyan1, SONG Yingbin1, LUO Xin1, ZHANG Dongjie1, FAN Zhimin1, XIE Zhimin2, CHENG Zhongjun1()   

  1. 1.State Key Laboratory of Urban Water Resource & Environment,School of Chemistry and Chemical Engineering
    2.National Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Harbin 150001,China
  • Received:2022-06-22 Online:2023-02-10 Published:2022-09-21
  • Contact: LAI Hua, CHENG Zhongjun E-mail:laihuahit@163.com;chengzhongjun@iccas.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(22075061);the State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology), China(2022TS37)

Abstract:

A kind of magnetic material with gradient shape was prepared, which is composed of magnetic particles and shape memory polymers. After further coating the dimethyl silane lubricant, we obtained a magnetic gradient slippery surface. A superparamagnetic droplet can self-transport directionally on the surface under the effect of magnetic gradient. Meanwhile, reversible control of surface morphology can be achieved based on the shape memory effect, which is favorable for on/off control of droplet sliding. Based on the above two merits, the combination of directional self-transportation and on/off sliding control was successfully achieved. In addition, we also investigated the influence of magnetic particles content on the shape memory property of materials in detail and the relationship between the deformation size of surface morphology and superparamagnetic droplet sliding performance. The mechanism analysis further demonstrates that the self-transportation of superparamagnetic droplet is driven by the directional force provided by magnetic field gradient, the resistance can be increased/eliminated during droplet self-transportation by the reversible control of the morphology of the surface. The synergistic effect of these two factors endows the surface with excellent manipulation of superparamagnetic droplet.

Key words: Slippery surface, Shape memory polymer, Superparamagnetic droplet, Self-transportation, Reversible control

CLC Number: 

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