In‐depth investigation of incremental layer build‐up from dried deposited droplets
In‐depth investigation of incremental layer build‐up from dried deposited droplets
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DOI：
10.1002/aic.17445
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发表时间：
2021-09
期刊：
影响因子：
3.7
通讯作者：
M. Janocha;E. Tsotsas
中科院分区：
文献类型：
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作者：
M. Janocha;E. Tsotsas
本研究提出了一种密切研究对流干燥的无根液滴累积层的过程的方法。以一滴一滴的方式，将三层苯甲酸钠溶液滴滴连续地涂在玻璃基板上，并在实验室规模的干燥室中依次干燥。在每次添加新液滴后，通过白光干涉法分析了从单个沉积物逐渐形成的简化层结构的形态。此外，对沉积物进行了互补的X射线微层析成像测量，以监测内部结构的发育。在整个实验建立过程中，反复出现的步骤和现象被识别出来，并可以通过这些方法进行表征。此外，这些现象可能与液滴定位和干燥条件的特定组合有关。最后，从形貌和孔隙度方面研究了对流干燥参数和液滴性质对层状形成过程的总体影响。
This study presents an approach to closely investigate the process of incremental layer build‐up from convectively dried sessile droplets. In a droplet‐by‐droplet manner, three layers of sodium benzoate solution droplets are consecutively applied on a glass substrate and successively dried in a laboratory‐scale drying chamber. The morphology of the simplified layer structure that incrementally forms from the individual deposits is analyzed via white‐light interferometry, after every addition of a new droplet. Furthermore, complementary X‐ray micro‐tomography measurements of the deposits were carried out to monitor inner structure development. Recurring steps and phenomena throughout the experimental build‐up process were identified and could be characterized through these methods. Moreover, these phenomena could be linked to specific combinations of droplet positioning and drying conditions. Finally, the overall influence of convective drying parameters as well as droplet properties on the layer formation process was investigated with regard to morphology and porosity.