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

Arrested shape formed during the impact of a 2mm water droplet onto hydrophobic 25μm particles. [Display omitted] 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...

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Bibliographic Details
Published in:Journal of colloid and interface science 2016-04, Vol.468, p.10-20
Main Authors: Supakar, T., Moradiafrapoli, M., Christopher, G.F., Marston, J.O.
Format: Article
Language:English
Subjects:
Armored interface
Drop impact
Droplets
Encapsulation
Formations
High-speed imaging
Impact tests
Joining
Kinetic energy
Liquid marbles
Liquids
Maximum deformation
Spreading
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Summary:Arrested shape formed during the impact of a 2mm water droplet onto hydrophobic 25μm particles. [Display omitted] 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.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2016.01.028