Evaporation of pinned droplets containing polymer - an examination of the important groups controlling final shape
Evaporation of pinned droplets containing polymer - an examination of the important groups controlling final shape
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DOI：
10.1002/aic.14777
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发表时间：
2015-05-01
期刊：
影响因子：
3.7
通讯作者：
Goddard, Simon
中科院分区：
文献类型：
--
作者：
Eales, Adam D.;Routh, Alexander F.;Goddard, Simon
在喷墨打印制备P-OLED显示器中，控制由于含有聚合物的钉扎液滴的蒸发而产生的最终形状是重要的。通常，由于钉扎和相关的向外毛细管流，会出现咖啡环状。出于操作上的原因，这是不可取的--需要平坦的地形。这项工作的目的是了解支配形状的重要群体，为油墨的选择提供实用指南。该理论是建立在薄膜润滑模型基础上的。控制方程数值求解，连续跟踪液体/凝胶锋面的横向发展。较大的毛细管数或较大的初始聚合物体积分数与最大聚合物体积分数之比会抑制咖啡环的形成。白光干涉法被用来从实验上证实这些发现。(C)2015美国化学工程师学会学报，61：1759-1767,2015
Controlling the final shape resulting from evaporation of pinned droplets containing polymer, is important in the fabrication of P-OLED displays by inkjet printing. Typically, a coffee - ring shape arises, due to the pinning and associated outward capillary flow. For operational reasons, this is undesirable - a flat topography is required. The aim of this work is to understand the important groups governing the shape, to provide a practical guide to ink selection. The theory presented is based on a thin-film lubrication model. The governing equations are solved numerically and continuously track the lateral progression of a liquid/gel front. A large capillary number or large ratio of initial to maximal polymer volume fraction can suppress the coffee-ring. White light interferometry is used to confirm these findings experimentally. (c) 2015 American Institute of Chemical Engineers AIChE J, 61: 1759-1767, 2015