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• W3000055729 endingPage "1328" @default.
• W3000055729 startingPage "1317" @default.
• W3000055729 abstract "Pickering emulsions show great potential for the petroleum industry, especially those that can realize emulsion inversion in basic conditions. Developing a simple and green approach to control emulsion inversion in basic conditions is highly desirable for harsh conditions and complicated operations. Here we report novel phase inversion of a Pickering emulsion through the controlled wettability of silica nanoparticles (NPs) by N-(2-((2-aminoethyl)amino)ethyl)octadecenamide (C18PDA) with Na2CO3 salt addition. A transitional phase inversion from an oil-in-water (O/W) emulsion to a water-in-oil (W/O) emulsion occurs with increasing C18PDA surfactant concentration for a given amount of Na2CO3 salt. A subsequent phase inversion from a W/O emulsion to an O/W emulsion then occurs with increasing Na2CO3 salt concentration at a low amount of C18PDA surfactant, and demulsification occurs when the Na2CO3 salt concentration is above 94 mM. The stable W/O Pickering emulsions are formed by virtue of adsorption of the C18PDA surfactant onto the silica surfaces, which imparts hydrophobicity to the inherently hydrophilic silica NPs and facilitates strong flocculation of the silica particles in the polar solution. However, the hydrophobicity of the silica NPs is reduced by salinity and is suitable for creating O/W emulsions due to the reduced interactions between the NPs and the C18PDA surfactant. The possible mechanism for emulsion inversion was investigated by characterizing turbidity, surface tension, contact angle, Fourier transform infrared spectroscopy with thermogravimetric analysis, zeta potentials, etc. The rheological properties of the reversible Pickering emulsion show that there is a smooth transition at the transitional inversion point, which differs from conventional surfactant-stabilized emulsions, in which the viscosity decreases to the minimum at the transitional inversion point. The emulsion phase inversion was also found to be conducive to improving the efficiency of filter-cakes cleanup. We anticipate this smart system to be easily operated and environmentally friendly, making it potentially applicable to real oil fields." @default.
• W3000055729 created "2020-01-23" @default.
• W3000055729 creator A5004299496 @default.
• W3000055729 creator A5012791673 @default.
• W3000055729 creator A5023830151 @default.
• W3000055729 creator A5048909193 @default.
• W3000055729 creator A5049264813 @default.
• W3000055729 creator A5066791475 @default.
• W3000055729 date "2020-01-09" @default.
• W3000055729 modified "2023-10-18" @default.
• W3000055729 title "Phase Inversion of Pickering Emulsions by Electrolyte for Potential Reversible Water-in-Oil Drilling Fluids" @default.
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