Controllable directional deformation of micro-pillars actuated by a magnetic field
Controllable directional deformation of micro-pillars actuated by a magnetic field
复制标题
磁场驱动微柱的可控定向变形
DOI：
10.1039/c9sm01672d
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发表时间：
2019-11-21
期刊：
影响因子：
3.4
通讯作者：
Chen, Shaohua
中科院分区：
文献类型：
--
作者：
Chai, Ze;Liu, Ming;Chen, Shaohua
众所周知，可以通过改变微结构表面的形貌来设计特殊的表面功能。本文提出了一种通过旋转磁场控制微柱阵列定向变形的简单而有效的方法。每个微柱的大变形可以通过磁场强度和方向来调节。当磁场强度一定时，微柱的变形方向由磁场方向控制。当磁场方向确定后，微柱的偏转随着磁场强度的增加而增加。基于最小势能原理，进一步建立了理论模型来揭示微柱如此大的变形机制。理论预测的变形柱形貌与实验结果吻合较好。目前的实验技术和理论结果对于可逆粘附、可控润湿性和定向表面传输等典型功能表面的设计和制备应该有用。
It is well known that special surface functions can be designed by varying the topography of micro-structured surfaces. In the present paper, a simple but effective method to control the directional deformation of micro-pillar arrays is proposed through a rotating magnetic field. The large deformation of each micro-pillar can be tuned by the magnetic field strength and direction. When the magnetic field strength is fixed, the deformation direction of micro-pillars is controlled by the direction of magnetic field. When the direction of magnetic field is determined, the deflection of micro-pillars increases with the increase of magnetic field strength. Based on the principle of minimum potential energy, a theoretical model is further established to disclose such a large deformation mechanism of micro-pillars. The theoretically predicted morphology of deformed pillars is well consistent with the experimental results. The present experimental technique and theoretical results should be useful for the design and preparation of typical functional surfaces such as reversible adhesion, controllable wettability and directional surface transport.