Spreading, encapsulation and transition to arrested shapes during drop impact onto hydrophobic powders

T. Supakar, M. Moradiafrapoli, G. F. Christopher, J. O. Marston

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We present findings from an experimental study of the impact of liquid droplets onto powder surfaces, where the particulates are hydrophobic. We vary both the size of the drop and impact speed coupled with the size range of the powder in order to assess the critical conditions for the formation of liquid marbles, where the drop becomes completely encapsulated by the powder, and arrested shapes where the drop cannot regain its spherical shape.By using different hydrophobization agents we find that a lower particle mobility may aid in promoting liquid marble formation at lower impact kinetic energies. From observations of the arrested shape formations, we propose that simple surface tensions may be inadequate to describe deformation dynamics in liquid marbles.

Original languageEnglish
Pages (from-to)10-20
Number of pages11
JournalJournal of Colloid And Interface Science
Volume468
DOIs
StatePublished - Apr 15 2016

Keywords

  • Armored interface
  • Drop impact
  • High-speed imaging
  • Liquid marbles
  • Maximum deformation

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