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Laser monitoring of non‐Newtonian liquids during dip coating
Author(s) -
Michels Alexandre F.,
Lovato Pedro,
Horowitz Flavio
Publication year - 2009
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11834
Subject(s) - coating , dip coating , interferometry , capacitive sensing , work (physics) , non newtonian fluid , materials science , newtonian fluid , laser , process engineering , optics , mechanics , nanotechnology , mechanical engineering , engineering , physics , electrical engineering
Dip coated films, widely used in the coating industry, are usually measured by capacitive methods with micrometric precision. In this work, interferometric determination of thickness evolution in real time, for the first time to our best knowledge, is applied to volatile non‐Newtonian liquids with several viscosities and distinct dip withdrawing speeds. Thickness evolution during the process depends on time as predicted by a power law model. Comparison with measured results (uncertainty of ± 0.007 μm) showed very good agreement after initial steps of the process. © 2009 American Institute of Chemical Engineers AIChE J, 2009