MATEC Web Conf.
Volume 333, 2021The 18th Asian Pacific Confederation of Chemical Engineering Congress (APCChE 2019)
|Number of page(s)||4|
|Section||Heat Transfer and Thermal Engineering|
|Published online||08 January 2021|
Effect of Marangoni Convection in a Droplet Containing Surfactant on Thin Film Shape
Department of Chemical Engineering, Graduate School of Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka City, Fukuoka 819-0395, Japan
* Corresponding author: firstname.lastname@example.org
In printed electronics, uniform and solute film formation by the inkjet method is very important. This study aims to clarify the relationship between Marangoni convection generated by adding surfactant and thinning of solute film. First, four types of surfactants were added one by one to the anisole-polystyrene solution with varying concentrations, and then a little amount of fluorescent polymer was added as tracer to each solution. Next, each solution was dropped on a hydrophilic substrate with a droplet diameter of 80 micrometers using an inkjet method, and the flow in the evaporation process and the shape of the solute film after drying were observed. As a result, Marangoni convection occurred when any surfactant was added at a certain concentration or more, and the solute film after drying of the droplets to which two kinds of surfactants were added became thin and approached a uniform shape. In addition, the measurement of surface tension showed that the visualized flow is the Marangoni convection.
© The Authors, published by EDP Sciences, 2021
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