Dynamics of the stratification process in drying colloidal dispersions studied by terahertz time-domain spectroscopy.
Dynamics of the stratification process in drying colloidal dispersions studied by terahertz time-domain spectroscopy.
复制标题
通过太赫兹时域光谱研究干燥胶体分散体中分层过程的动力学。
DOI：
10.1021/la503322v
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发表时间：
2014
期刊：
影响因子：
3.9
通讯作者：
J. V. Mechelen
中科院分区：
文献类型：
--
作者：
J. V. Mechelen
我们提出了一种光学研究，揭示了干燥胶体分散体分层过程的整体动力学。太赫兹时域光谱分析已被用于原位测量溶剂型和水性漆层随干燥时间的变化。干燥顶层和湿底层厚度以及散体厚度的动态行为反映了所建立的干燥机理的主要过程。此外，结果表明，只有当干燥过程处于蒸发控制区域时，涂层才会分层，而扩散控制干燥时，涂层仍保持单层结构。
We present an optical study that reveals the bulk dynamics of the stratification process in drying colloidal dispersions. Terahertz time-domain spectroscopy has been used to measure in situ solventborne and waterborne paint layers as a function of drying time. The dynamic behavior of the dry top layer and wet bottom layer thickness, as well as the bulk thickness, reflect the principal processes of the established drying mechanism. In addition, the results demonstrate stratification only when the drying process is in the evaporation controlled regime, whereas the coating is shown to remain a single layer for diffusion controlled drying.