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Thin, binary liquid droplets, containing polymer: an investigation of the parameters controlling film shape

Published online by Cambridge University Press:  30 March 2016

A. D. Eales ,
N. Dartnell ,
S. Goddard  and
A. F. Routh
A. D. Eales
Affiliation:
Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, UK
N. Dartnell
Affiliation:
Cambridge Display Technology Ltd (Company Number 02672530), Godmanchester PE29 2XG, UK
S. Goddard
Affiliation:
Cambridge Display Technology Ltd (Company Number 02672530), Godmanchester PE29 2XG, UK
A. F. Routh*
Affiliation:
Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, UK
*
†Email address for correspondence: afr10@cam.ac.uk
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Abstract

For the fabrication of P-OLED displays, using inkjet printing, it is important to control the final shape resulting from evaporation of droplets containing polymer. Due to peripheral pinning and consequent outward capillary flow, a ring-like final shape is typically observed. This is often undesirable, with a spatially uniform film usually required. Several experimental studies have shown that binary liquid inks can prevent ring formation. There is no consensus of opinion on the mechanism behind this improvement. We have developed a model for the drying of thin, binary liquid droplets, based on thin-film lubrication theory, and we solve the governing equations to predict the final shape. White-light interferometry experiments are conducted to verify the findings. In addition, we present the results of a linear stability analysis that identifies the onset of an instability driven by a difference in surface tension. If the more volatile liquid is more abundant, an instability becomes increasingly likely.

JFM classification

Interfacial Flows (free surface): Capillary flows Complex Fluids: Colloids Interfacial Flows (free surface): Thin films
Type
Papers
Information
Journal of Fluid Mechanics , Volume 794 , 10 May 2016 , pp. 200 - 232
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Copyright
© 2016 Cambridge University Press 

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