Preparation and Physicochemical Performance Evaluation of Amphiphilic Janus Nanosheets
We used hexadecyltrimethoxysilane and 3-aminopropyltrimethoxysilane(APTMS)as modifi-ers.Thermal expansion microspheres(TEMS)were used as templates.APTMS was adsorbed on the surface of thermal expansion microspheres(TEMS)and Janus spheres(TEMS@SiO2)were obtained through sol-gel processing.Hexadecyltrimethoxysilane(HDTMS)was used to modify TEMS@SiO2,and the thermal expansion of TEMS caused the Janus sphere's shell to rupture,resulting in amphiphilic Janus nanosheets.The amphiphilic Janus nanosheets were analyzed using FT-IR,TG,and TEM.Sub-sequently,the prepared amphiphilic Janus nanosheets were dispersed in simulated formation water to prepare a nanofluid.The stability,oil-water interfacial tension,emulsification capability,and en-hanced oil recovery performance were evaluated.The results showed that the nanofluid(0.1%,mass score,same below)did not exhibit phase separation after 10 d of storage,and it had good stability with a Zeta potential of 31.2 mV at pH=7.The nanofluid(0.1%)demonstrated excellent emulsifica-tion capability with a 100%emulsification index after 10 days.Additionally,the nanofluid(0.1%)could reduce the oil-water interfacial tension to 3.2 mN/m.The nanofluid(0.1%)drive significantly improved the enhanced oil recovery,particularly achieving a 21.5%increase in recovery at a permea-bility of 8.9×10-3 μm2.
amphiphilic janus nanoparticlethermally expandable microspherenanofluidinterfacial propertieoilfield chemical
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维普
