Boulogne F, Giorgiutti-Dauphiné F, Pauchard L
UPMC Univ Paris 06, Univ Paris-Sud, CNRS, F-91405. Lab FAST, Bat 502, Campus Univ, Orsay, F-91405, France.
Soft Matter. 2015 Jan 7;11(1):102-8. doi: 10.1039/c4sm02106a.
We report an experimental study on the drying of silica colloidal dispersions. Here we focus on surface instability occurring in a drying paste phase before crack formation which affects the final film quality. Observations at macroscopic and microscopic scales reveal the occurrence of instability, and the morphology of the film surface. Furthermore, we show that the addition of adsorbing polymers on silica particles can be used to suppress the instability under particular conditions of molecular weight and concentration. We relate this suppression to the increase of the paste elastic modulus.
我们报告了一项关于二氧化硅胶体分散体干燥的实验研究。在这里，我们关注在裂纹形成之前的干燥糊相阶段发生的表面不稳定性，这种不稳定性会影响最终的薄膜质量。宏观和微观尺度的观察揭示了不稳定性的发生以及薄膜表面的形态。此外，我们表明，在二氧化硅颗粒上添加吸附性聚合物可用于在特定的分子量和浓度条件下抑制不稳定性。我们将这种抑制与糊体弹性模量的增加联系起来。
