Functional Janus-SiO2 Nanoparticles Prepared by a Novel “Cut the Gordian Knot” Method and Their Potential Application for Enhanced Oil Recovery

Surface Modification Janus Particles Brine
DOI: 10.1021/acsami.0c01593 Publication Date: 2020-04-23T19:23:25Z
ABSTRACT
Currently available methods (e.g., interfacial protection and phase separation) for preparing Janus nanoparticles are often complex expensive. Furthermore, the preparation of with a particle size below 10 nm is challenging. In this work, we combine an in situ surface-modification route chemical etching to establish novel "cut Gordian knot" method functional Janus-SiO2 nanoparticles. Hydrophobic SiO2 three-dimensional network structure prepared via were dispersed NaOH solution containing surfactant or ethanol enable corrosion close modifier–nanoparticle interface relatively low content surface modifiers. Thus, amphipathic hydrophilic Si–OH species hydrophobic −CH3 fragments generated. The as-prepared 4–9 specific area up 612.9 m2/g can be easily water, they also transfer from water oil by tuning polarity. Moreover, tuned achieve bidirectional regulation wettability plus reduction oil/water tension. Hence, significant (by 33∼50%) injection pressure enhanced recovery (EOR) 21.1% ∼ 26.6%) achieved. Apart that, able increase viscosity partially hydrolyzed polyacrylamide 282.9% significantly decrease its loss ratio brine, causing EOR about 36.6%. With simple, low-cost, scalable procedures, following approach could well applicable fabricating high potential augmented as low-permeability reservoirs.
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