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Published November 1, 2000 | public
Journal Article Open

Selective dip-coating of chemically micropatterned surfaces


We characterize the selective deposition of liquid microstructures on chemically heterogeneous surfaces by means of dip coating processes. The maximum deposited film thickness depends critically on the speed of withdrawal as well as the pattern size, geometry, and angular orientation. For vertically oriented hydrophilic strips, we derive a hydrodynamic scaling relation for the deposited film thickness which agrees very well with interferometric measurements of dip-coated liquid lines. Due to the lateral confinement of the liquid, our scaling relation differs considerably from the classic Landau–Levich formula for chemically homogeneous surfaces. Dip coating is a simple method for creating large area arrays of liquid microstructures for applications involving chemical analysis and synthesis, biochemical assays, or wet printing of liquid polymer or ink patterns.

Additional Information

©2000 American Institute of Physics. (Received 11 May 2000; accepted 17 August 2000) This project is funded by the Electronic Technology Office of the Defense Advanced Research Projects Agency as part of the Molecular Level Printing Program. The authors also gratefully acknowledge the Austrian Fonds zur Förderung der wissenschaftlichen Forschung for a postdoctoral fellowship (AAD) and the Eastman Kodak Corporation for a graduate fellowship (SMM). Dr. N. Pittet and Dr. C. Monnereau assisted with the assembly of the dip-coating apparatus.


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