title: Patterns formed by droplet evaporation from a restricted geometry.
abstract: We show that hundreds of concentric rings, each approximately nanometers high and micrometers wide, form when a drop is allowed to evaporate from a confined geometry, leaving behind a dry, nonvolatile polymer solute. This new preparative strategy offers a simple, versatile, generalizable method to produce patterns of unprecedented high fidelity and regularity, as well as a direction to look to design yet more complex patterns.
authors.affiliation: Departments of Materials Science and Engineering, Chemistry, and Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. zqlin@iastate.edu
authors.forename: Zhiqun
authors.initials: Z
authors.lastname: Lin
authors.forename: Steve
authors.initials: S
authors.lastname: Granick