Journal of Nanoparticle Research

, Volume 6, Issue 5, pp 479–487

Spontaneous formation of large-area monolayers of well-ordered nanoparticles via a wet-coating process

  • Minghui Hu
  • Shigeki Chujo
  • Hiroyuki Nishikawa
  • Yukio Yamaguchi
  • Tatsuya Okubo
Article

Abstract

Monolayers of well-ordered close-packed silica nanoparticles (NPs) with a diameter of 25 nm were spontaneously formed on silicon substrates over a large area and at a high rate via a wet-coating process using a capillary coater. The effects of zeta potential, dispersion solvent, and substrate friction on the NP self-assembly induced by the solvent evaporation were investigated. Experimental results showed that the solvent and the substrate had a larger impact on the order of formed monolayers than the zeta potential did, which are discussed from the viewpoint of the Derjaguin-Landau-Verwey-Overbeek (DLVO) and non-DLVO theories. Based on the above studies, we proposed a solution to fabrication of well-ordered NP monolayers without boundary defects at the surface coverage of ∼1 via the wet-coating process.

Keywords

silica nanoparticles monolayer capillary coater self-assembly zeta potential DLVO forces non-DLVO forces colloids coatings 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Minghui Hu
    • 1
  • Shigeki Chujo
    • 2
  • Hiroyuki Nishikawa
    • 1
  • Yukio Yamaguchi
    • 1
  • Tatsuya Okubo
    • 1
  1. 1.Department of Chemical System EngineeringThe University of TokyoTokyoJapan
  2. 2.Japan Chemical Innovation InstituteTokyoJapan

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