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    Influencing foam properties of aqueous bis(2-ethylhexyl)sulfosuccinate solutions by addition of polypropylene-glycol-modified and amino-modified silica nanoparticles

    Year: 2022

    Journal: Colloid Surf. A-Physicochem. Eng. Asp., Volume 655, DEC 20

    Authors: Aono, Keita; Shiba, Hiroya; Suzuki, Furitsu; Yomogida, Yoshihiro; Hasumi, Motomitsu; Kado, Shinpei; Nakahara, Yoshio; Yajima, Setsuko

    Keywords: Air -water interface; Bis(2-ethylhexyl)sulfosuccinate; Silica nanoparticle; Dynamic surface tension; Dilational rheology; Foam property

    The effect of silica nanoparticle (SiO2NP) addition on the air-water interfacial rheology and foam properties was investigated in aqueous solutions of bis(2-ethylhexyl)sulfosuccinate (AOT), an anionic surfactant. Two types of SiO2NPs were prepared: polypropylene-glycol-modified SiO2NPs (PPG-SiO2NPs) and amino-modified SiO2NPs (NH2-SiO2NPs). The addition of SiO2NPs stabilized the foam in the aqueous AOT solution in all cases, but the effect on the air-water interfacial behavior differed depending on the SiO2NP type. Adsorption of NH2-SiO2NPs to the air-water interface improved the air-water interfacial dilational viscoelasticity (E), enhancing foam stability. Although PPG-SiO2NPs did not adsorb to the air-water interface, the movement of AOT molecules to the air -water interface was partially suppressed by hydrophobic interaction with PPG-SiO2NPs in the bulk aqueous solution. This event limited the decrease in E, thereby stabilizing the foam.
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