Evaporation Induced Spontaneous Micro-Vortexes via Engineering Marangoni Flow.,Angewandte Chemie International Edition

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Evaporation Induced Spontaneous Micro-Vortexes via Engineering Marangoni Flow.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-09-14 , DOI: 10.1002/anie.202008477
Zheren Cai _{1,

2} , Zhandong Huang ₃ , Zheng Li ₁ , Meng Su ₁ , Zhipeng Zhao _{1,

2} , Feifei Qin ₄ , Zeying Zhang _{1,

2} , Jun Yang ₃ , Yanlin Song _{1,

2}

Affiliation

Vortex flow fields are widely used to manipulate objects at the microscale in microfluidics. Previous approaches to produce the vortex flow field mainly focused on inertia flows. It remains a challenge to create vortexes in Stokes flow regime. Here we reported an evaporation induced spontaneous vortex flow system in Stokes flow regime by engineering Marangoni flow in a micro‐structured microfluidic chip. The Marangoni flow is created by nonuniform evaporation of surfactant solution. Various vortexes are constructed by folding the air–water interface via microstructures. Patterns of vortexes are programmable by designing the geometry of the microstructures and are predictable using numerical simulations. Moreover, rotation of micro‐objects and enrichment of micro‐particles using vortex flow is demonstrated. This approach to create vortexes will provide a promising platform for various microfluidic applications such as biological analysis, chemical synthesis, and nanomaterial assembly.

中文翻译：

通过工程Marangoni流动蒸发诱导的自发微涡流。

涡流场被广泛用于微流控中的微观尺度上的物体操纵。产生涡流场的先前方法主要集中在惯性流上。在斯托克斯流态中产生涡旋仍然是一个挑战。在这里，我们报道了通过在微结构微流控芯片中工程化Marangoni流动而在Stokes流动状态下蒸发诱发的自发涡流系统。Marangoni流是由表面活性剂溶液的不均匀蒸发产生的。通过微结构折叠空气-水界面可以构造出各种旋涡。通过设计微结构的几何形状，可以对涡旋图形进行编程，并且可以使用数值模拟来预测涡旋图形。此外，还演示了微物体的旋转和利用涡流的富集。

更新日期：2020-09-14

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