Controlling Coffee Ring Formation during Drying of Inkjet Printed 2D Inks
Controlling Coffee Ring Formation during Drying of Inkjet Printed 2D Inks
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DOI：
10.1002/admi.201700944
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发表时间：
2017-11-23
影响因子：
5.4
通讯作者：
Derby, Brian
中科院分区：
文献类型：
--
作者：
He, Pei;Derby, Brian
当GO的平均直径低于临界尺寸时，通过喷墨印刷产生的氧化石墨烯（GO）油墨的液滴的形态在干燥后显示出独特的咖啡环。具有较大直径薄片的油墨不显示咖啡环，并且过渡平均薄片直径随着基底温度增加并且当印刷液滴尺寸减小时减小。这种行为可以用一个模型来预测，该模型将悬浮液中高长径比颗粒团聚的特征时间与干燥过程中蒸发液滴开始后退的时间尺度进行比较。该模型被示出为精确地描述从咖啡环到均匀干燥的存款的过渡，使用一系列的GO油墨，平均薄片尺寸在0.68-35.9 μ m的范围内，干燥温度为20-60 ℃，和液滴尺寸与接触直径范围从30到800 μ m。
The morphology of drops of graphene oxide (GO) inks produced by inkjet printing shows a distinctive coffee ring after drying when the mean diameter of the GO is below a critical size. Inks with larger diameter flakes do not show a coffee ring and the transition mean flake diameter decreases as the substrate temperature increases and when the printed drop size decreases. This behavior can be predicted with a model that compares the characteristic time for the agglomeration of high aspect ratio particles in suspension with the time scale for an evaporating liquid drop to begin receding during the drying process. The model is shown to accurately describe the transition from a coffee ring to a uniform dried deposit using a range of GO inks with mean flake size in the range 0.68-35.9 mu m, drying temperatures of 20-60 degrees C, and drop sizes with contact diameter ranging from 30 to 800 mu m.