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Controlling the drying-induced peeling of colloidal films.
Soft Matter ( IF 2.9 ) Pub Date : 2020-07-28 , DOI: 10.1039/d0sm00252f
Abdulkadir Osman 1 , Lucas Goehring 2 , Hugh Stitt 3 , Nima Shokri 4
Affiliation  

In this work, we investigated the effect of the suspension properties on the drying dynamics and the resulting film peeling instability. To do so, a comprehensive series of experiments were conducted using drops of aqueous mixtures of colloidal silica dispersions and polyethylene oxide (PEO) additives. Time-lapse digital microscope images of the evaporating droplets show that film peeling can be discouraged and eventually eliminated with an increase in PEO concentration and molecular weight. This is due to the additives modifying the suspension properties which in turn modify the drying front length across the evaporating surface. Our result extends the understanding of the physics of film failure which is relevant information for various industrial processes such as in inkjet printing and coating applications.

中文翻译:

控制干燥引起的胶体膜剥离。

在这项工作中,我们研究了悬浮性能对干燥动力学的影响以及由此产生的膜剥离不稳定性。为此,使用胶态二氧化硅分散体和聚环氧乙烷(PEO)添加剂的水性混合物滴进行了一系列综合实验。随时间流逝的蒸发液滴数字显微镜图像显示,随着PEO浓度和分子量的增加,可以防止并最终消除薄膜剥离。这是由于添加剂改变了悬浮性能,进而改变了整个蒸发表面的干燥前沿长度。我们的结果扩展了对胶片故障物理学的理解,这是与各种工业过程(如喷墨印刷和涂料应用)相关的信息。
更新日期:2020-09-23
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