Drying crack patterns of sessile drops with tuned contact line
Drying crack patterns of sessile drops with tuned contact line
复制标题
具有调谐接触线的坐滴干燥裂纹图案
DOI：
10.1016/j.colsurfa.2021.126780
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发表时间：
2021-09
期刊：
影响因子：
--
通讯作者：
Jing Guangyin
中科院分区：
文献类型：
--
作者：
Yan Ningzhe;Luo Hao;Yu Haiping;Liu Yanan;Jing Guangyin
在薄膜、油漆和涂料的沉积物中形成的干燥裂纹使沉积物失效并限制相应的应用。人们已经进行了大量的实验尝试和理论理解，以发现潜在的机制，并避免在均匀膜的情况下出现裂纹。然而，由于接触线的存在，质量、内部流动和几何收缩的强耦合，导致存款厚度的不均匀性，干燥液滴的裂纹形成非常复杂。有趣的是，胶体颗粒、溶液、环境等复杂的物理化学影响可以通过接触线的运动几何地反映出来，而对裂纹形成的影响尚缺乏研究。因此，在本文中，我们提出了一个模型系统来检查接触线的动态运动和相关的裂纹形成的相应机制。支持基板的润湿性被成功地调整，以控制具有不同接触角的液滴形状，即从亲水性到疏水性。通过调节接触线的流动性，确定了三种干燥方式：固定、粘滑和后退。发现裂纹间距与接触线附近局部沉积物厚度之间近似呈线性关系，并在标度律分析中定性地讨论了这一关系。最后，抑制的裂纹沉积物实际上实现了自由移动的接触线上的光滑的基板在后退的情况下，具有广泛的悬浮液浓度。
Drying cracks formed in the deposits of films, paints, and coatings make the deposits failure and limit the corresponding applications. Extensive experimental attempts and theoretical understanding have been made to discover the underlying mechanisms and avoid cracks in the cases of uniform films. However, crack formation from drying drops is greatly complicated due to the strong coupling of the mass, internal flow and geometry constriction by the presence of the contact line, resulting in the heterogeneity of the deposit thickness. Interestingly, the complex physicochemical influences from colloidal particle, solution, surroundings can be geometrically reflected by the motion of the contact line, while the effect on crack formation is still lack of investigations. Hence, in this paper, we propose a model system to examine the dynamical motion of the contact line and correlate the corresponding mechanism of crack formation. The wettability of supporting substrates are successfully tuned in order to control the drop shapes with different contact angles, i.e. from hydrophilic to hydrophobic. Three drying regimes are recognized as pinned, stick-slip and receding by tuning the mobility of the contact line. The correlation between the crack spacing and the local thickness of deposits near the contact line is found as approximately linear, which is qualitatively discussed in the analysis of the scaling law. Finally, suppression of the cracks deposits are practically realized by freely moving contact line on the slippery substrates in receding cases with a wide range of suspension concentration.
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影响因子：
5.6
作者：
D. Mal;S. Sinha;T. Middya;S. Tarafdar
通讯作者：
D. Mal;S. Sinha;T. Middya;S. Tarafdar
DOI：
10.1103/physreve.94.012618
发表时间：
2016-07
期刊：
Physical review. E
影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
Glenn M. Channell;C. Zukoski
影响因子：
3.7
作者：
Murisic, N.;Kondic, L.
通讯作者：
Kondic, L.
DOI：
10.1021/acs.langmuir.6b01986
发表时间：
2016-08
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Chiyu Xie;Guangzhi Liu;Moran Wang
通讯作者：
Chiyu Xie;Guangzhi Liu;Moran Wang