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Heterogeneous magnetic micropillars for regulated bending actuation
Extreme Mechanics Letters ( IF 4.7 ) Pub Date : 2020-04-15 , DOI: 10.1016/j.eml.2020.100734
Zhengzhi Wang , Kun Wang , Xuhai Tang

Magnetic micropillars that can dynamically and reversibly bend actuated by external magnetic field have been widely studied for surface engineering and micromanipulation applications. However, current micropillars usually exhibit uniform distribution of the magnetic media inside and thus respond essentially the same way to external stimuli. Here we report a new concept and a corresponding experimental technique for heterogeneous magnetic micropillars with the placement of the inside magnetic nanoparticles being precisely controlled. By manipulating the spatial distribution of the magnetic nanoparticles from the base region to the tip region within the micropillars, we show that the actuated bending deformation can be tuned by as large as one order of magnitude under the same actuation condition. The different bending responses are enabled by the resulting different distributions of the local stiffness and the actuation force along the micropillars, in consistent with the fundamental bending principles for cantilever beams. The heterogeneous magnetic micropillars reported here provide a prototype for regulated and on-demand actuations using stimuli-responsive materials/structures.



中文翻译:

异质磁性微柱,用于可调节的弯曲驱动

可以通过外部磁场动态地和可逆地弯曲的磁性微柱已被广泛研究用于表面工程和微操纵应用。但是,当前的微柱通常在内部显示出磁性介质的均匀分布,因此对外部刺激的反应基本相同。在这里,我们报告了异质磁性微柱的新概念和相应的实验技术,其中精确控制了内部磁性纳米颗粒的位置。通过操纵磁性纳米粒子在微柱内从基部区域到尖端区域的空间分布,我们显示了在相同的驱动条件下,可将弯曲的弯曲变形调整一个数量级。与沿悬臂梁的基本弯曲原理相一致,通过沿微柱产生的局部刚度和致动力的不同分布,可以实现不同的弯曲响应。本文报道的异质磁性微柱提供了使用刺激响应性材料/结构进行调节和按需驱动的原型。

更新日期:2020-04-15
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