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Printing small dots from large drops.

Emma L Talbot1, Huai N Yow, Lisong Yang

  • 1Department of Chemistry and ‡School of Engineering and Computing Sciences, Durham University , South Road, Durham, DH1 3LE, U. K.

ACS Applied Materials & Interfaces
|January 24, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed two strategies to prevent particle spreading during solvent droplet drying. By adding clay or polymer, they created compact particle disks, reducing deposit size by up to 90% and controlling particle distribution.

Keywords:
depletion flocculationdroplet depositiondryingink-jet printingsol−gel transition

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Fluid dynamics

Background:

  • Droplet evaporation typically causes particle deposition at the contact line, forming a ring stain.
  • Volatile solvent mixtures can create surface tension gradients, driving particle migration to the droplet center.
  • Further drying stages can still lead to particle redistribution, hindering controlled deposition.

Purpose of the Study:

  • To investigate methods for controlling particle distribution in drying droplets.
  • To achieve compact particle deposits significantly smaller than the initial droplet footprint.
  • To inhibit particle migration during the final stages of solvent evaporation.

Main Methods:

  • Utilizing volatile solvent mixtures to induce internal convection cells.
  • Incorporating nanoparticulate clay to trigger an evaporation-driven sol-gel transition.
  • Adding a non-adsorbing polymer to induce depletion flocculation.

Main Results:

  • Two distinct strategies were successfully implemented to fix particle distribution.
  • The addition of nanoparticulate clay inhibited convective flow during later drying stages.
  • Depletion flocculation effectively restricted particle motion after central concentration.
  • Resulting particle deposits occupied as little as 10% of the initial droplet area.

Conclusions:

  • Controlled particle deposition in evaporating droplets is achievable.
  • Sol-gel transitions and depletion flocculation are effective mechanisms for particle fixation.
  • These methods offer significant reduction in deposit size and precise control over particle distribution.