Synergy between Composite Nanoparticles and Saponin β-Escin to Produce Long-Lasting Foams
2020
A synergy
between poly(vinylpyrrolidone) (PVP)-coated silica nanoparticles
(CPs) and saponin β-escin was exploited to develop long-lasting
foams using low component concentrations. Individually, foams stabilized
by either CPs or saponin β-escin suffered from bubble coarsening
and bubble coalescence, respectively. In contrast, the successful
synergy of CPs and saponin β-escin was shown to provide excellent
foamability and foam stability, with no direct interaction between
the two components. The CPs aggregated strongly in 0.55 M Na2SO4 and formed a porous stabilizing network, hindering
bubble coalescence but not bubble coarsening. However, in foams stabilized
by saponin β-escin and CPs, the bubble interface was saturated
by the two components, with CPs forming thick liquid lamellae between
bubbles, hindering liquid drainage and bubble coalescence, and saponin
β-escin (added at 0.01 wt %) saturating the pore space in the
CP interfacial network to retard bubble coarsening. Adding saponin
β-escin as a co-foaming agent, the foamability and foam lifetime
were increased by ∼2.5 and ∼4 times, respectively, compared
to CP-stabilized foams.
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