Imaging the drying of a colloidal suspension
Imaging the drying of a colloidal suspension
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DOI：
10.1039/c0sm00323a
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发表时间：
2010-01-01
期刊：
影响因子：
3.4
通讯作者：
Leng, Jacques
中科院分区：
文献类型：
--
作者：
Bodiguel, Hugues;Leng, Jacques
我们对充满二氧化硅纳米颗粒胶体溶胶的固着液滴内部的干燥动力学进行了实验研究。我们使用快速双色共焦显微镜成像，一方面定量提取罗丹明标记的纳米溶胶的浓度场，另一方面定量提取大型荧光素标记示踪剂的速度场和迁移率场。通过改变液滴干燥时的初始浓度，我们提出了一种获得溶胶流变学的自洽方法。基于这些结果，我们从以下方面分析了干燥动力学：(i) 流动模式，包括竞争确定最终浓度分布的蒸发流和马兰戈尼流；以及 (ii) 与溶胶流变学定量相关的截断动力学。
We present an experimental investigation of the drying kinetics seen from inside a sessile droplet laden with a colloidal sol of silica nanoparticles. We use fast, two-color confocal microscopy imaging to quantitatively extract on the one hand the concentration field of the rhodamine-tagged nanosol and on the other hand the velocity field and the mobility field of large, fluorescein-tagged tracers. By changing the initial concentration at which the drop dries up, we propose a method that yields a self-consistent way to obtain the rheology of the sol. Based on these results, we analyse the drying kinetics in terms (i) of flow patterns that include evaporating and Marangoni flows which compete to determine the final concentration profile and (ii) of truncated dynamics that we quantitatively relate to the rheology of the sol.