Impingement-assisted self-assembly of ferrofluid droplets under magnetic field
Impingement-assisted self-assembly of ferrofluid droplets under magnetic field
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DOI：
10.1063/5.0059420
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发表时间：
2021-07
影响因子：
4
通讯作者：
Zhaoyi Wang;R. Tao;Jun Wu;Bing Li;Chonglei Hao
中科院分区：
文献类型：
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作者：
Zhaoyi Wang;R. Tao;Jun Wu;Bing Li;Chonglei Hao
铁磁流体独特的液体性质和强大的磁响应能力使得液滴能够分裂并自组装成可重构的三维结构。虽然在静态或准静态状态下的磁流体液滴的操纵已经得到了很好的研究，在动态状态下的磁流体的分裂和自组装仍然是未知的。在这里，我们报告的冲击辅助超疏水表面上的铁磁流体的自组装，从而大大降低了所需的磁场。特别是，磁场强度和韦伯数之间的耦合赋予了一个精确的调节的铁磁流体的冲击后的动力学，这有利于自组装行为的优化。最后，我们证明了冲击辅助自组装的铁磁流体可以推广到各种表面上具有不同的润湿性。对液滴撞击过程中自组装的基本理解和能力可以为铁磁流体液滴的动力学以及在多功能分析和流体装置中的适用性提供重要的见解。
The unique liquid nature and strong magnetic response ability enable ferrofluid droplets to split and self-assemble into reconfigurable three-dimensional structures. Although the manipulation of a ferrofluid droplet in a static or quasi-static state has been well studied, the splitting and self-assembly of ferrofluids in a dynamic state remain unexplored. Here, we report the impingement-assisted self-assembly of ferrofluids on superhydrophobic surfaces, whereby the required magnetic field is greatly reduced. In particular, the coupling between the magnetic field strength and Weber number endows a precise regulation of the ferrofluid post-impact dynamics, which facilitates the optimization of the self-assembly behavior. Finally, we demonstrate that the impingement-assisted self-assembly of ferrofluids can be generalized on various surfaces with different wettability. The fundamental understanding and the ability to self-assembly during droplet impingement can provide important insight into the dynamics of ferrofluid droplets as well as the applicability in multifunctional analytical and fluidic devices.