Evaporation-driven colloidal cluster assembly using droplets on superhydrophobic fractal-like structures,Soft Matter

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Evaporation-driven colloidal cluster assembly using droplets on superhydrophobic fractal-like structures
Soft Matter ( IF 2.9 ) Pub Date : 2020-11-24 , DOI: 10.1039/d0sm01346c
Carola Seyfert _{1,

2,

3,

4,

5} , Erwin J. W. Berenschot _{2,

3,

4,

5,

6} , Niels R. Tas _{2,

3,

4,

5,

6} , Arturo Susarrey-Arce _{2,

3,

4,

5,

6} , Alvaro Marin _{1,

2,

3,

4,

5}

Affiliation

Microparticles can be considered building units for functional systems, but their assembly into larger structures typically involves complex methods. In this work, we show that a large variety of macro-agglomerate clusters (“supra-particles”) can be obtained, by systematically varying the initial particle concentration in an evaporating droplet, spanning more than 3 decades. The key is the use of robust superhydrophobic substrates: in this study we make use of a recently discovered kind of patterned surface with fractal-like microstructures which dramatically reduce the contact of the droplet with the solid substrate. Our results show a clear transition from quasi-2D to 3D clusters as a function of the initial particle concentration, and a clear transition from unstable to stable 3D spheroids as a function of the evaporation rate. The origin of such shape transitions can respectively be found in the dynamic wetting of the fractal-like structure, but also in the enhanced mechanical stability of the particle agglomerate as its particle packing fraction increases.

中文翻译：

蒸发驱动的胶体簇组装，使用超疏水的分形结构上的液滴

可以将微粒视为功能系统的构建单元，但是将它们组装成较大的结构通常涉及复杂的方法。在这项工作中，我们表明，通过系统地改变蒸发液滴中的初始粒子浓度（超过3年），可以获得大量的宏观团簇（“超粒子”）。关键是使用坚固的超疏水性基材：在这项研究中，我们使用了一种最近发现的具有分形状微观结构的图案化表面，该结构可显着减少液滴与固体基材的接触。我们的结果表明，从准2D团簇到3D团簇的清晰过渡是初始粒子浓度的函数，而从不稳定的3D球体到稳定的3D球体的清晰过渡是蒸发速率的函数。

更新日期：2020-11-25

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