Drying-mediated assembly of colloidal nanoparticles into large-scale microchannels

Wei Han, Bo Li, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

Large-scale highly ordered microchannels were spontaneously and rapidly created by simply drying the colloidal nanoparticle suspension on a rigid substrate. Interestingly, free evaporation of colloidal suspension yielded radially aligned microchannels, while constrained evaporation that was rendered by the use of confined geometries composed of either two nearly parallel plates or a slide placed perpendicular to a rigid substrate imparted the formation of periodic arrays of parallel microchannels in a controllable manner. The microchannels were formed as a result of the competition between stress relaxation due to crack opening that ruptured the film and stress increase due to the loss of solvent. Quite intriguingly, these patterned microchannels can be exploited as templates to craft well-ordered metallic stripes. This facile and scalable approach may offer a new paradigm of producing microscopic patterns over large areas with unprecedented regularity at low cost that can serve as scaffolds for use in microelectronics and microfluidic-based biochips, among other areas.

Original languageEnglish
Pages (from-to)6079-6085
Number of pages7
JournalACS Nano
Volume7
Issue number7
DOIs
StatePublished - 23 Jul 2013

Keywords

  • colloidal suspension
  • cracks
  • drying-mediated assembly
  • microchannels

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