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Research Article

Pattern Formation in Draining Thin Film Suspensions

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M. Buchanan,*^†^‡ D. Molenaar,^† S. de Villiers,^† and R. M. L. Evans^§

Physics of Geological Processes, University of Oslo, Blindern, 0316 Oslo, Norway, Department of Physics, University of Oslo, Blindern, 0316 Oslo, Norway. and School of Physics & Astronomy, University of Leeds, Leeds LS2 9JT, U.K.

Langmuir, 2007, 23 (7), pp 3732–3736

DOI: 10.1021/la063282a

Publication Date (Web): February 23, 2007

Section:

Unit Operations and Processes

Abstract

We demonstrate the emergence of complexity from remarkably simple and ubiquitous systems: draining thin-film suspensions exhibiting a striking transition between two classes of self-organizing patterns. Vertical channels form when attractive forces lead to transient gelation, while horizontal bands result from granular mixtures. We propose an explanation whereby the generic physical mechanisms require only the existence of viscous and excluded-volume couplings among the particles, solvent, and substrate. System-specific, small inhomogeneities trigger large-scale pattern formation, through collective dynamics, where jamming plays a crucial role. Our results shed light on emergent complexity in bio- and geophysical processes and have implications for coatings and food industries.

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History

Published In Issue March 27, 2007
Received November 9, 2006
Revised January 9, 2007

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Research Article

Pattern Formation in Draining Thin Film Suspensions

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Metal Film over Nanosphere (MFON) Electrodes for Surface-Enhanced Raman Spectroscopy (SERS): Improvements in Surface Nanostructure Stability and Suppression of Irreversible Loss

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Killer Whales (Orcinus orca) Face Protracted Health Risks Associated with Lifetime Exposure to PCBs

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