聚结驱动的围绕微帽生长的纳米液滴的自组织
Coalescence driven self-organization of growing nanodroplets around a microcap
摘要：
生长液滴之间的聚结对于液滴在表面上的表面覆盖和空间排列是重要的。在这项工作中，全内反射荧光（TIRF）显微镜被用来原位调查周围的聚合物微帽边缘的纳米液滴的形成，具有亚微米的空间和毫秒的时间分辨率。我们观察到液滴之间的聚结经常发生在它们的生长过程中的溶剂交换。我们的实验结果表明，从两个合并的液滴的位置有关的父液滴的大小。聚结液滴的位置和母液滴尺寸的比例服从标度律，反映了基于尺寸不平等的聚结偏好。作为液滴聚结的结果，两个相邻液滴的质心之间的角度随着时间的推移而增加，在不同的时间间隔服从液滴的几乎对称的布置。模拟了生长液滴聚结的位置和数量的演变。聚结驱动的自组织生长液滴的机制是通用的，适用于不同尺寸的微帽和不同液体的液滴。从这项工作的理解可能是有价值的定位nanodrops的成核和生长，而不使用模板。
英文摘要：
The coalescence between growing droplets is important for the surface coverage and spatial arrangements of droplets on surfaces. In this work, total internal reflection fluorescence (TIRF) microscopy is utilized to in-situ investigate the formation of nanodroplets around the rim of a polymer microcap, with sub-micron spatial and millisecond temporal resolution. We observe that the coalescence among droplets occurs frequently during their growth by solvent exchange. Our experimental results show that the position of the droplet from two merged droplets is related to the size of the parent droplets. The position of the coalesced droplet and the ratio of parent droplet sizes obey a scaling law, reflecting a coalescence preference based on the size inequality. As a result of droplet coalescence, the angles between the centroids of two neighbouring droplets increase with time, obeying a nearly symmetrical arrangement of droplets at various time intervals. The evolution of the position and number from coalescence of growing droplets is modelled. The mechanism for coalescence driven self-organization of growing droplets is general, applicable to microcaps of different sizes and droplets of different liquids. The understanding from this work may be valuable for positioning nanodroplets by nucleation and growth without using templates.
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