A simple method for simulating the coffee stain effect
A simple method for simulating the coffee stain effect
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DOI：
10.1016/j.powtec.2014.02.024
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发表时间：
2014-04-01
影响因子：
5.2
通讯作者：
Kraft, Torsten
中科院分区：
文献类型：
--
作者：
Breinlinger, Thomas;Kraft, Torsten
在薄基底上喷墨印刷如微观电子电路路径的结构包括颗粒悬浮液的逐滴施加和干燥。这些液滴的干燥会留下沉积物存款的多种结构，控制这些结构是工艺设计中的主要研究课题。在这项工作中，我们提出了一个简单而有效的模拟方法预测沉积物的三维结构的基础上的布朗动力学的单向耦合方案和Marangoni流存在下的干燥胶体滴内的流体流动的分析建模。针对具有高颗粒浓度（高达20体积%）的微米尺寸的液滴，我们的方法考虑了颗粒扩散和对流、颗粒碰撞以及接触线处的颗粒交错。实验结果验证了该方法的有效性，并将其应用于预测一种新装置的性能。我们发现，从我们的模拟，DLVO力可以忽略一个稳定的悬浮液，该模型在预测咖啡污渍的形成。(C)2014爱思唯尔有限公司版权所有。
Inkjet printing of structures like microscopic electronic circuit paths on thin substrates includes drop wise application and drying of particulate suspensions. The drying of these drops can leave behind a multiplicity of structures of sediment deposit, which to control is a major subject of investigation in the design of the process. In this work we present a simple and efficient simulation method for predicting the three dimensional structure of sediment deposits based on a one way coupled scheme of Brownian dynamics and analytic modeling of the fluid flow inside a drying colloidal drop under presence of Marangoni flow. Aiming for micrometer sized drops with high particle concentrations (up to 20 vol.%), our method takes into account particle diffusion and convection, particle collisions as well as particle staggering at the contact line. The method is validated by experimental results and applied to predict the behavior of a new setup. We find from our simulations that DLVO forces may be neglected for a well stabilized suspension and that the model works well in predicting coffee stain formation. (C) 2014 Elsevier B.V. All rights reserved.