Wetting Kinetics of Thin Films of Dilute Polymer Solutions
Coating surfaces with very thin polymer films requires the knowledge of wetting kinetics. Previous experiments have shown that drops containing polymer solutions spread on glass surfaces with rates appropriate for a wetting liquid, but stop abruptly. Calculations are provided here for the spreading of a thin film pinned to a slot. The film contains a dissolved polymer and the solvent is wetting and does not evaporate. The driving forces are the Laplace pressure and the disjoining pressure due to the presence of polymers. The latter is due in parts to the entropic effect and in parts due to steric exclusion. It will be shown that if the uncertainty in linear measurements is significant, as in microscopy, then the experimental observations are readily explained.
P. Neogi and S. Saritha, "Wetting Kinetics of Thin Films of Dilute Polymer Solutions," The 2005 Annual Meeting (AICHE), American Institute of Chemical Engineers (AIChE), Nov 2005.
The 2005 Annual Meeting (AICHE)
Chemical and Biochemical Engineering
Keywords and Phrases
Glass; Laplace Transforms; Reaction Kinetics; Thin Films; Wetting
Article - Conference proceedings
© 2005 American Institute of Chemical Engineers (AIChE), All rights reserved.
01 Nov 2005