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Preparation of Modified Nano-SiO₂ Oil Dispersion System and the Stability of Its O/W Emulsion
Zhibin Zhou,Jiexiang Wang 한국고분자학회 2016 폴리머 Vol.40 No.2
Nano-SiO₂ was organically modified with silane coupling agent-KH570 to prepare the modified Nano-SiO2 oil dispersion system. By increasing the dosage of KH570, the ζ-potential (absolute value) and the char yield values decreased gradually. When KH570 was 5%, the maximum contact angle with water reached 79.8°. Then, the modified Nano-SiO₂ was composed with petroleum sulfonate (PS) and its ability of reducing the O/W interfacial tension was measured. The results showed that, O/W interfacial tension reduced to about 5.86×10<SUP>-3</SUP> mN/m when the Nano-SiO₂ and petroleum sulfonate composite was mixed with the mass fraction of 0.2:0.3%. The emulsion stability coefficient was 2.15 after 120 min which was the minimum. It indicated that this compounded system had the best emulsifying ability because Nano-SiO₂ particles were dragged onto the O/W interface by the PS molecules to improve the intensity of O/W interface.