Zwitterion-based materials by virtue of their special physical and chemical characteristics have attracted researchers to utilize them for fabricating functional coatings. The simultaneous presence of positive and neg...Zwitterion-based materials by virtue of their special physical and chemical characteristics have attracted researchers to utilize them for fabricating functional coatings. The simultaneous presence of positive and negative charges renders the zwitterion-based materials with electrostatically induced hydration properties, which enables a high resistance towards oily pollutants, nonspecific protein adsorption, bacterial adhesion and biofilm formation. This review starts from the working mechanism of zwitterions and covers the fabrication strategies of zwitterion-based functional coatings, namely the zwitterion-bearing binder route, the zwitterion-bearing additive route and the post-generation of coatings containing zwitterionic precursors. The applications of zwitterion-based functional coatings are discussed, including medical implants, marine antifouling and oil-resistant coatings, with focus on the relevant mechanisms of the zwitterion-containing coatings for a specific performance. Finally, some comments and perspectives on the current situation and future development of zwitterion-based functional coatings are given.展开更多
High salinity and high oil content present major challenges to the effectiveness of foam in enhanced oil recovery(EOR).This study introduces RCS,a novel oil-resistant foam system designed for reservoirs with salinity ...High salinity and high oil content present major challenges to the effectiveness of foam in enhanced oil recovery(EOR).This study introduces RCS,a novel oil-resistant foam system designed for reservoirs with salinity levels reaching 2.1×10^(5)mg/L.RCS forms stable foams at oil-water ratios up to 60%and is effective across a wide crude oil viscosity range(10.8-7890 mPa·s).We investigated the film properties of oil-containing foam and the co-permeation behavior of the crude oil-N_(2)-foam system to elucidate the mechanisms underlying foam stability and steady-state flow.RCS emulsified high-viscosity crude oil into stable,large droplets that accumulated within the plateau borders,reducing drainage.Even at concentrations as low as 0.01 wt%,RCS formed stable pseudoemulsion films that prevented intrusion into the gas-water interface,allowing the foam half-life to be mainly controlled by the dilatational viscoelasticity of the interface.With increasing oil-water ratios,both drainage resistance and dilatational modulus increased,extending the drainage and foam half-lives.Coreflood experiments showed that co-injection of RCS with N_(2) and crude oil produced stable foams and in-situ emulsions.At 5%oil fractional flow,the critical foam quality(f_(g)^(*))remained unchanged compared to oil-free conditions,although the maximum apparent viscosity decreased by 29.8%.At 10%oil fractional flow,f_(g)^(*)shifted to a lower value,while the apparent viscosity in the low-quality regime increased markedly—exceeding that of the oil-free condition.These findings highlight that while crude oil more strongly impairs foam stability in porous media than in bulk,the formation of in-situ emulsions can partially offset or even enhance mobility control through a synergistic Jamin effect.Therefore,in-situ emulsification should be emphasized in foam applications within oil-containing environments.展开更多
Bio-based elastomer poly(diethyl itaconate-co-isoprene)(PDEII) was designed and synthesized by redox-initiated emulsion polymerization from diethyl itaconate and isoprene with mass ratio of 20:80, 40:60, 60:40 and 80:...Bio-based elastomer poly(diethyl itaconate-co-isoprene)(PDEII) was designed and synthesized by redox-initiated emulsion polymerization from diethyl itaconate and isoprene with mass ratio of 20:80, 40:60, 60:40 and 80:20. The number-average molecular weights of PDEII exceeded 140000 with relatively high yields. The physical properties of PDEII, such as glass transition temperatures and thermostability, were comparable with conventional synthetic elastomers and can be readily tuned by varying the ratio of diethyl itaconate to isoprene. The interaction between silica and PDEII macromolecules was effectively enhanced with the increase of diethyl itaconate content by endowing high polarity. The oil-resistance relevant properties of silica/PDEII80(80% diethyl itaconate, 20% isoprene) such as retention of tensile strength, retention of elongation at break and change in volume even surpass those of silica/NBR 240 S after soaked in ASTM 3# oil at different temperatures.展开更多
基金Sponsored by the National Key Research and Development Program of China(Grant No.2020YFE0100300)the National Natural Science Foundation of China(Grant No.51973036)。
文摘Zwitterion-based materials by virtue of their special physical and chemical characteristics have attracted researchers to utilize them for fabricating functional coatings. The simultaneous presence of positive and negative charges renders the zwitterion-based materials with electrostatically induced hydration properties, which enables a high resistance towards oily pollutants, nonspecific protein adsorption, bacterial adhesion and biofilm formation. This review starts from the working mechanism of zwitterions and covers the fabrication strategies of zwitterion-based functional coatings, namely the zwitterion-bearing binder route, the zwitterion-bearing additive route and the post-generation of coatings containing zwitterionic precursors. The applications of zwitterion-based functional coatings are discussed, including medical implants, marine antifouling and oil-resistant coatings, with focus on the relevant mechanisms of the zwitterion-containing coatings for a specific performance. Finally, some comments and perspectives on the current situation and future development of zwitterion-based functional coatings are given.
基金financial support of National Natural Science Foundation of China(52474049)Oil&Gas Major Project(2025ZD1407202)+1 种基金Natural Science Foundation of Sichuan Province(2024NSFSC0198)the Tianfu Yongxing Laboratory Organized Research Project Funding(2023KJGG17)。
文摘High salinity and high oil content present major challenges to the effectiveness of foam in enhanced oil recovery(EOR).This study introduces RCS,a novel oil-resistant foam system designed for reservoirs with salinity levels reaching 2.1×10^(5)mg/L.RCS forms stable foams at oil-water ratios up to 60%and is effective across a wide crude oil viscosity range(10.8-7890 mPa·s).We investigated the film properties of oil-containing foam and the co-permeation behavior of the crude oil-N_(2)-foam system to elucidate the mechanisms underlying foam stability and steady-state flow.RCS emulsified high-viscosity crude oil into stable,large droplets that accumulated within the plateau borders,reducing drainage.Even at concentrations as low as 0.01 wt%,RCS formed stable pseudoemulsion films that prevented intrusion into the gas-water interface,allowing the foam half-life to be mainly controlled by the dilatational viscoelasticity of the interface.With increasing oil-water ratios,both drainage resistance and dilatational modulus increased,extending the drainage and foam half-lives.Coreflood experiments showed that co-injection of RCS with N_(2) and crude oil produced stable foams and in-situ emulsions.At 5%oil fractional flow,the critical foam quality(f_(g)^(*))remained unchanged compared to oil-free conditions,although the maximum apparent viscosity decreased by 29.8%.At 10%oil fractional flow,f_(g)^(*)shifted to a lower value,while the apparent viscosity in the low-quality regime increased markedly—exceeding that of the oil-free condition.These findings highlight that while crude oil more strongly impairs foam stability in porous media than in bulk,the formation of in-situ emulsions can partially offset or even enhance mobility control through a synergistic Jamin effect.Therefore,in-situ emulsification should be emphasized in foam applications within oil-containing environments.
基金supported by the National Basic Research Program of China (2015CB654700)the National Natural Science Foundation of China (50933001)+2 种基金the State Key Program of National Natural Science of China (51333004)the Innovative Research Groups of the Natural Science Foundation of China (51221002)the Goodyear Tire & Rubber Company
文摘Bio-based elastomer poly(diethyl itaconate-co-isoprene)(PDEII) was designed and synthesized by redox-initiated emulsion polymerization from diethyl itaconate and isoprene with mass ratio of 20:80, 40:60, 60:40 and 80:20. The number-average molecular weights of PDEII exceeded 140000 with relatively high yields. The physical properties of PDEII, such as glass transition temperatures and thermostability, were comparable with conventional synthetic elastomers and can be readily tuned by varying the ratio of diethyl itaconate to isoprene. The interaction between silica and PDEII macromolecules was effectively enhanced with the increase of diethyl itaconate content by endowing high polarity. The oil-resistance relevant properties of silica/PDEII80(80% diethyl itaconate, 20% isoprene) such as retention of tensile strength, retention of elongation at break and change in volume even surpass those of silica/NBR 240 S after soaked in ASTM 3# oil at different temperatures.
