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Effects of a chemically heterogeneous island on the dynamic contact angles of droplets

机译：化学异质岛对液滴动态接触角的影响

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摘要

Droplets moving on surfaces are affected by the heterogeneity of the substrates. In the present study, the effects of partial heterogeneity of the substrates on the dynamic contact angles are numerically investigated by using a two-dimensional many-body dissipative particle dynamics (MDPD) model. The results show that for a droplet moving over a chemically heterogeneous island, the effects of the heterogeneity on the advancing and receding contact angles are largely different, although both the advancing and receding contact angles increase firstly when the front contact point reaches the heterogeneous island. In the meantime, the front contact point gets pinned and de-pinned alternately with the shape of the droplet deforming periodically while it is not so apparent for the rear contact point. Both the advancing and receding contact angles experience drastic fluctuation when the front contact point passes the island and it is different for the tail of the droplet passing the island. Also, the kinetic energy of the droplet decreases rapidly. In addition, the energy dissipation increases with the increasing number of stripes in the island region. The results illustrate that the advancing contact angle has higher sensitivity to the heterogeneity of the substrate than the receding one. Our findings can bring an insight on the mechanism of micro-droplets moving on heterogeneous substrates.
机译：在表面上移动的液滴受基材异质性的影响。在本研究中，通过使用二维多体耗散粒子动力学（MDPD）模型，数值研究了基底的部分异质性对动态接触角的影响。结果表明，对于在化学异质岛上移动的液滴，异质性对前进和后退接触角的影响差异很大，尽管当正面接触点到达异质岛时前进和后退接触角都会先增大。同时，前接触点交替地被钉住和去钉住，液滴的形状周期性地变形，而对于后接触点则不是那么明显。当前接触点通过岛时，前进和后退接触角都会经历剧烈的波动，而液滴的尾部通过岛时则有所不同。而且，液滴的动能迅速降低。另外，能量消耗随着岛状区域中条纹数量的增加而增加。结果表明，前进接触角比后退接触角对衬底的异质性具有更高的灵敏度。我们的发现可以为微滴在异质底物上移动的机理提供见解。

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