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    Synergy between Composite Nanoparticles and Saponin beta-Escin to Produce Long-Lasting Foams

    Year: 2020

    Journal: Ind. Eng. Chem. Res., Volume 59, APR 22, page 7495–7501

    Authors: Yu, Kai; Li, Bin; Wang, Zhentao; Zhang, Wei; Wang, Dongbao; Xu, Haojie; Wang, Junfeng; Harbottle, David

    Organizations: Senior Talent Foundation of Jiangsu University [19JDG029]

    A synergy between poly(vinylpyrrolidone) (PVP)-coated silica nanoparticles (CPs) and saponin beta-escin was exploited to develop long-lasting foams using low component concentrations. Individually, foams stabilized by either CPs or saponin beta-escin suffered from bubble coarsening and bubble coalescence, respectively. In contrast, the successful synergy of CPs and saponin beta-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 beta-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 -escin (added at 0.01 wt %) saturating the pore space in the CP interfacial network to retard bubble coarsening. Adding saponin beta-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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