Spreading of triple line and dynamics of bubble growth inside nanoparticle dispersions on top of a substrate plate

Saeid Vafaei, Dongsheng Wen

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

This work investigates the feasibility of engineering surface wettability by using different nanoparticles. As an illustration, detailed formation of gas bubbles on top of a stainless steel substrate plate in a quiescent pool of aqueous gold and alumina nanofluids is studied. The presence of nanoparticles is shown to be able to modify the dynamics of triple line and bubble growth significantly. An early pinning of the bubble triple line is observed and a larger bubble contact angle is found for bubbles growing in a gold nanofluid, whereas an opposite phenomenon is observed for bubbles growing in an alumina nanofluid compared to those of pure water. Other bubble parameters such as departure volume, bubble frequency, and waiting time of bubble formation are also affected by the presence of nanoparticles. The variation of solid surface tensions due to the existence of nanoparticles and the resultant force at the triple line should be responsible for such differences. Such results illustrate the big potential of nanoparticle in engineering surface wettability of a solid-liquid-gas system.

Original languageEnglish
Pages (from-to)285-291
Number of pages7
JournalJournal of Colloid and Interface Science
Volume362
Issue number2
DOIs
StatePublished - 15 Oct 2011
Externally publishedYes

Keywords

  • Alumina nanofluids
  • Boiling
  • Bubble
  • Bubble contact angle
  • Critical heat flux
  • Droplet contact angle
  • Gold nanofluids
  • Solid surface tensions
  • Surface tension
  • Surface wettability

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