Methods have been used to generate air bubbles beneath a planar air−water interface, stabilized by
partially hydrophobic quasi-spherical silica particles (primary diameter of 20 nm) in pure water. Particles
tended to aggregate at the planar interface, and all the silica dispersions had low foamability. However,
those bubbles that were formed (with radii of 5−200 μm) were completely stable to disproportionation for
several days, in contrast to similar bubbles stabilized by the best protein foam stabilizers, which typically
shrank and disappeared in 1 or 2 h.
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