Controlling the Drying and Film Formation Processes of Polymer Solution Droplets with Addition of Small Amount of Surfactants
Controlling the Drying and Film Formation Processes of Polymer Solution Droplets with Addition of Small Amount of Surfactants
复制标题
DOI：
10.1021/jp9077757
复制
发表时间：
2009-11-26
影响因子：
3.3
通讯作者：
Doi, Masao
中科院分区：
文献类型：
--
作者：
Kajiya, Tadashi;Kobayashi, Wataru;Doi, Masao
我们研究了如何添加表面活性剂改变干燥和膜形成过程的聚合物溶液液滴与接触线强烈固定银行结构。我们发现，即使表面活性剂的量非常小，它也会使聚合物膜的最终轮廓从环状轮廓急剧改变为平坦轮廓。通常观察到这种性质，与聚合物浓度、液滴体积和溶剂类型无关。我们推测，表面活性剂的不均匀分布所造成的外向毛细流动诱导的Marangoni流指向液滴的中心，这抑制了向外流动。本现象暗示了用于在喷墨印刷技术中控制聚合物膜的轮廓的有效方法。
We studied how the addition of surfactants alters the drying and film formation processes of polymer solution droplets with contact lines strongly fixed by bank structures. We found that even if the amount of surfactant is quite small, it drastically changes the final profile of the polymer film from a ring-like profile to a flat profile. This property is observed commonly, irrespective of the polymer concentration, droplet volume, and type of solvent. We conjecture that the inhomogeneous distribution of the surfactant caused by the outward capillary flow induces the Marangoni flow directed toward the center of the droplet, which suppresses the outward flow. The present phenomenon implies an effective method for controlling the profile of the polymer film in inkjet printing technologies.