Autostratification in Drying Colloidal Dispersions: Effect of Particle Interactions
Autostratification in Drying Colloidal Dispersions: Effect of Particle Interactions
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DOI：
10.1021/la2039762
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发表时间：
2012-02-07
期刊：
影响因子：
3.9
通讯作者：
Routh, Alexander F.
中科院分区：
文献类型：
--
作者：
Atmuri, Anand K.;Bhatia, Surita R.;Routh, Alexander F.
当不同尺寸或电荷的颗粒混合并流延时，垂直偏析在所生产的膜中是不可避免的现象。除了Peclet数（蒸发与扩散速率的比值）之外，颗粒相互作用在确定颗粒在干燥膜中的分布方面起着至关重要的作用。Trueman等人(1)开发了一个模型，在干燥过程中的颗粒垂直偏析。他们的数值解假设化学势完全由熵决定。我们报告的粒子相互作用在各种系统中的效果：（i）带电粒子与不同的Peclet数和（ii）带电粒子与相同的Peclet数。还对Peclet数跨越1的粒子进行了实验研究，实验结果与理论预测相符。
When particles differing in size or charge are mixed and cast, vertical segregation is an inevitable phenomenon in the produced films. Apart from the Peclet number, which is the ratio of evaporation to diffusion rates, particle interactions play a crucial role in determining the distribution of particles in the dried films. Trueman et al.(1) developed a model for vertical segregation of particles during drying. Their numerical solution assumed that the chemical potentials were determined entirely by entropy. We report the effect of particle interactions in various systems: (i) charged particles with different Peclet numbers and (ii) charged particles with the same Peclet numbers. An experimental study has also been carried out for particles with Peclet numbers straddling unity; the experimental results conform with the behavior predicted theoretically.