Related Experiment Video
Updated: Jul 6, 2026

Applying Permanent, Robust Stenciled Patterns of Fine Particles to Elastomeric Surfaces
Published on: July 8, 2025
Coupling between precipitation and contact-line dynamics: multiring stains and stick-slip motion
Siddharth Maheshwari1, Lu Zhang, Yingxi Zhu
1Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA.
Abstract:
The contact line in an evaporating drop can stay pinned to form a single ring or can shrink in a discontinuous stepwise manner and generate multiple rings. We demonstrate the latter with DNA solutions and attribute it to a pinning-depinning cycle that generates new contact lines. The new contact line recedes after depinning and is repinned at an internal precipitate ring that determines the location of the next contact line. Each precursor ring is formed when DNAs are trapped by an internal microstagnation flow and precipitation dynamics hence control this unsteady drop motion.
Related Concept Videos
Precipitation Processes
Precipitation and Co-precipitation
Types of Coprecipitation
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Streamlines, Streaklines, and Pathlines
Precipitation Gravimetry
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Precipitation Titration Curve: Analysis
