Coalescence driven self-organization of growing nanodroplets around a microcap†,Soft Matter

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Coalescence driven self-organization of growing nanodroplets around a microcap†
Soft Matter ( IF 2.9 ) Pub Date : 2018-03-07 00:00:00 , DOI: 10.1039/c7sm02490h
Brendan Dyett _{1,

2,

3,

4,

5} , Hao Hao _{3,

4,

5,

6} , Detlef Lohse _{7,

8,

9,

10,

11} , Xuehua Zhang _{12,

13,

14,

15,

16}

Affiliation

Soft Matter & Interfaces Group
School of Engineering
RMIT University
Melbourne
Australia
Electrical and Biomedical Engineering
Physics of Fluids Group
Department of Science and Engineering
Mesa+ Institute
J. M. Burgers Centre for Fluid Dynamics and the Max Planck Center Twente for Complex Fluid Dynamics
University of Twente
Department of Chemical & Materials Engineering
Faculty of Engineering
University of Alberta
Edmonton
Canada

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.

中文翻译：

凝聚驱动微帽周围生长的纳米液滴的自组织†

生长液滴之间的结合对于液滴的表面覆盖和表面上的空间排列很重要。在这项工作中，利用全内反射荧光（TIRF）显微镜原位研究了在聚合物微帽的边缘周围形成具有纳米级空间和毫秒级时间分辨率的纳米液滴的方法。我们观察到液滴之间的聚结在通过溶剂交换的生长过程中经常发生。我们的实验结果表明，来自两个合并液滴的液滴位置与母体液滴的大小有关。聚结的液滴的位置和父液滴大小的比率遵循缩放定律，反映了基于大小不等式的聚结偏好。液滴聚结的结果是，两个相邻液滴的质心之间的角度随时间增加，服从不同时间间隔的液滴几乎对称的排列。从生长的液滴的聚结位置和数量的演变进行了建模。凝聚驱动的自组织生长液滴的机制是通用的，适用于不同大小的微囊和不同液体的液滴。这项工作的理解对于不使用模板通过成核和生长来定位纳米液滴可能是有价值的。

更新日期：2018-03-07

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