Multicomponent Droplet Evaporation on Chemical Micro-Patterned Surfaces.
Multicomponent Droplet Evaporation on Chemical Micro-Patterned Surfaces.
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DOI：
10.1038/srep41897
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发表时间：
2017-02-03
影响因子：
4.6
通讯作者：
Qiu H
中科院分区：
文献类型：
--
作者：
He M;Liao D;Qiu H
研究了多组分液滴在加热的化学图案化表面上的蒸发和动力学。与多组分液滴在均质表面上的蒸发过程相比，化学花纹表面不仅可以通过拉长接触线来增强蒸发，而且可以将均匀表面的蒸发过程从恒定接触线(CCL)区、恒定接触角(CCA)区和混合模式(MM)转变为恒定接触线(CCL)区和移动接触线(MCL)区两个区。在微观范围内，详细研究了MCL区接触线阶跃运动的机理。此外，采用改进的接触线局部力模型分析了均匀表面和花纹表面的临界后退接触角。分析结果对两种表面都有很好的一致性，并证实了从CCL到MCL区域的转变表明液滴组成从多组分转变为单组分，为预测和控制使用图案化表面的多组分液滴的动态行为和组成提供了重要的度量。
The evaporation and dynamics of a multicomponent droplet on a heated chemical patterned surface were presented. Comparing to the evaporation process of a multicomponent droplet on a homogenous surface, it is found that the chemical patterned surface can not only enhance evaporation by elongating the contact line, but also change the evaporation process from three regimes for the homogenous surface including constant contact line (CCL) regime, constant contact angle (CCA) regime and mix mode (MM) to two regimes, i.e. constant contact line (CCL) and moving contact line (MCL) regimes. The mechanism of contact line stepwise movement in MCL regimes in the microscopic range is investigated in detail. In addition, an improved local force model on the contact line was employed for analyzing the critical receding contact angles on homogenous and patterned surfaces. The analysis results agree well for both surfaces, and confirm that the transition from CCL to MCL regimes indicated droplet composition changes from multicomponent to monocomponent, providing an important metric to predict and control the dynamic behavior and composition of a multicomponent droplet using a patterned surface.