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Manipulating the Coffee-Ring Effect: Interactions at Work.

Manos Anyfantakis1,2,3, Damien Baigl1,2,3

  • 1Ecole Normale SupĂ©rieure-PSL Research University, Department of Chemistry, 24 rue Lhomond, 75005, Paris (France).

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
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Summary
This summary is machine-generated.

Controlling the coffee-ring effect (CRE) in colloidal suspensions is key. Interactions at interfaces and between particles, not just flow, significantly impact deposit patterns, offering new formulation and diagnostic strategies.

Keywords:
aggregationcoffee-ring effectcolloidsevaporationinterfaces

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Area of Science:

  • Colloid and Interface Science
  • Materials Science
  • Fluid Dynamics

Background:

  • The coffee-ring effect (CRE) describes particle deposition in a ring after solvent evaporation.
  • While flow patterns are studied, colloid interactions' role in CRE is less understood.

Purpose of the Study:

  • To review and synthesize recent research on colloid interactions influencing the CRE.
  • To establish rules for controlling CRE morphology by tuning interactions.
  • To provide guidelines for formulating colloidal suspensions for desired particle patterns.

Main Methods:

  • Literature review of studies on colloid-interface and colloid-colloid interactions.
  • Analysis of how these interactions affect deposit morphology.
  • Synthesis of findings to establish control principles.

Main Results:

  • Colloid interactions with liquid-solid and liquid-gas interfaces significantly alter deposit morphology.
  • Bulk particle-particle interactions also play a crucial role in CRE.
  • Tuning these interactions allows for control over particle deposition patterns.

Conclusions:

  • Interactions are critical for controlling the coffee-ring effect, complementing flow dynamics.
  • This understanding enables rational formulation of colloidal suspensions for precise particle patterning.
  • New applications for CRE in diagnostics and interface patterning are proposed.