Osman Abdulkadir, Goehring Lucas, Stitt Hugh, Shokri Nima
Department of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, M13 9PL, UK.
School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK.
Soft Matter. 2020 Sep 23;16(36):8345-8351. doi: 10.1039/d0sm00252f.
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.
在这项工作中，我们研究了悬浮特性对干燥动力学以及由此产生的薄膜剥离不稳定性的影响。为此，我们使用胶体二氧化硅分散体和聚环氧乙烷（PEO）添加剂的水性混合物液滴进行了一系列全面的实验。蒸发液滴的延时数字显微镜图像显示，随着PEO浓度和分子量的增加，薄膜剥离可以得到抑制并最终消除。这是由于添加剂改变了悬浮特性，进而改变了蒸发表面上的干燥前沿长度。我们的结果扩展了对薄膜破裂物理过程的理解，这对于诸如喷墨打印和涂层应用等各种工业过程来说是相关信息。
