Assembly of nanoparticles at the contact line of a drying droplet under the influence of a dipped tip

Kemal Keseroĝlu, Mustafa Çulha

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The manipulation of colloidal nanoparticles (NPs) in a drying droplet has critical importance not only for several industrial applications but also their assembly into patterns on surfaces. The influence of a tip with hydrophilic or hydrophobic surfaces dipped into a drying droplet on hydrophilic or hydrophobic surfaces on the behavior of 98. nm latex NPs was investigated. The formation of concentric rings on hydrophilic glass surfaces regardless of the surface chemistry of the dipped tip was observed. On the other hand, no pattern formation on hydrophobic surfaces was observed with the insertion of the tip. With a hydrophilic tip, the concentric rings were formed due to stick-slip motion of the solvent contact line resulting from competition between pinning and capillary forces while the capillary effect was not effective until the surface of the tip was changed by adherent NPs making the tip surface available for water adherence with a hydrophobic tip, which results in the pulling of droplet towards the tip. It is also found that the tip thickness and suspension concentration significantly influences the formation of concentric rings on surfaces. This simple procedure can be used to influence the distribution or assembly of NPs in the droplet area.

Original languageEnglish (US)
Pages (from-to)8-14
Number of pages7
JournalJournal of Colloid and Interface Science
Volume360
Issue number1
DOIs
StatePublished - Aug 1 2011
Externally publishedYes

Keywords

  • Contact line pinning
  • Droplet
  • Nanoparticles
  • Self-assembly

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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