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Marangoni flow alters wetting: Coffee ring and superspreading
Current Opinion in Colloid & Interface Science ( IF 8.9 ) Pub Date : 2020-09-23 , DOI: 10.1016/j.cocis.2020.08.012
Alex D. Nikolov , Darsh T. Wasan , Pingkeng Wu

Colloidal nano altered wetting is an everyday phenomenon with various applications. It occurs when an aqueous colloidal droplet is placed on a wet solid and evaporates with a pinned contact line (to form a shape similar to a coffee ring) and when a ‘superspreader’ is placed on a partially wet solid surface with an unpinned contact line. This article reviews recent advances on the mechanisms behind these two phenomena. For the coffee ring phenomenon, besides the evaporation flow, the thermal and solutal Marangoni flow are critical to the radial flow as they carry solutes from the droplet's interior to the contact line. The particle self-assembly into a layered structure at the droplet edge involves particle structuring under confinement and the stagnation flow. While superspreading is not fully understood, it is proposed that the Marangoni flow plays an essential role in superspreading.



中文翻译:

Marangoni流动改变润湿性:咖啡环和超级铺展

胶体纳米改变的润湿是各种应用中的日常现象。当将水性胶体液滴放在湿的固体上并通过固定的接触线蒸发(形成类似于咖啡环的形状)时,以及将“超级撒布机”通过未固定的接触线放置在部分湿的固体表面上时,会发生这种情况。本文回顾了这两种现象背后的机制的最新进展。对于咖啡环现象,除了蒸发流,Marangoni热流和溶质Marangoni流对于径向流也很重要,因为它们将溶质从液滴内部传送到接触线。粒子在液滴边缘的自组装成分层结构涉及约束和停滞流下的粒子结构。虽然超级传播尚不完全清楚,

更新日期:2020-10-17
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