Capillary force on particles near a drop edge resting on a substrate and a criterion for contact line pinning

Ashok S. Sangani, Changhsin Lu, Kenghsien Su, James A. Schwarz

Research output: Contribution to journalArticle

58 Scopus citations

Abstract

When a drop of liquid containing particles is allowed to evaporate from a substrate, the flow induced by the liquid evaporating from the drop edge carries the particles to the edge. If these particles prevent the drop edge from receding as the evaporation proceeds, then more particles will be accumulated near the drop edge resulting in the formation of a deposit that resembles coffee rings. We determine the capillary force on the particles near a drop edge and the effect of the particles on the gas-liquid-substrate contact angle to derive a condition that must be satisfied for particles to form the ringlike pattern.

Original languageEnglish (US)
Article number011603
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume80
Issue number1
DOIs
StatePublished - Aug 6 2009

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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