Arresting dissolution by interfacial rheology design [Engineering]
A strategy to halt dissolution of particle-coated air bubbles in water based on interfacial rheology design is presented.
Whereas previously a dense monolayer was believed to be required for such an “armored bubble” to resist dissolution, in fact
engineering a 2D yield stress interface suffices to achieve such performance at submonolayer particle coverages. We use a
suite of interfacial rheology techniques to characterize spherical and ellipsoidal particles at an air–water interface as
a function of surface coverage. Bubbles with varying particle coverages are made and their resistance to dissolution evaluated
using a microfluidic technique. Whereas a bare bubble only has a single pressure at which a given radius is stable, we find
a range of pressures over which bubble dissolution is arrested for armored bubbles. The link between interfacial rheology
and macroscopic dissolution of
𝝁m bubbles coated with
𝝁m particles is presented and discussed. The generic design rationale is confirmed by using nonspherical particles, which develop
significant yield stress at even lower surface coverages. Hence, it can be applied to successfully inhibit Ostwald ripening
in a multitude of foam and emulsion applications.
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