Superhydrophobic aluminum surfaces with a high water contact angle and low sliding angle on aluminum plate substrate were fabricated by means of surface etching with sodium hydroxide under ultrasonic bathing and then ...Superhydrophobic aluminum surfaces with a high water contact angle and low sliding angle on aluminum plate substrate were fabricated by means of surface etching with sodium hydroxide under ultrasonic bathing and then modification with fluorosilane. Scanning electron microscopy（SEM） showed a honeycomb-like structure on aluminum substrate surface after etching under ultrasonic bathing. And the surface was rendered from superhydrophilicity to superhydrophobicity after further modification with fluorosilane.展开更多
Oil-based drilling fluids possess excellent properties such as shale inhibition, cuttings suspension, and superior lubrication, making them essential in the development of unconventional oil and gas reservoirs.However...Oil-based drilling fluids possess excellent properties such as shale inhibition, cuttings suspension, and superior lubrication, making them essential in the development of unconventional oil and gas reservoirs.However, wellbore instability, caused by the invasion of drilling fluids into shale formations, remains a significant challenge for the safe and efficient extraction of shale oil and gas. This work reports the preparation of mesoporous SiO2nanoparticles with low surface energy, utilized as multifunctional agents to enhance the performance of oil-based drilling fluids aimed at improving wellbore stability. The results indicate that the coating prepared from these nanoparticles exhibit excellent hydrophobicity and antifouling properties, increasing the water contact angle from 32°to 146°and oil contact angle from 24°to134.8°. Additionally, these nanoparticles exhibit exceptional chemical stability and thermal resistance.Incorporating these nanoparticles into oil-based drilling fluids reduced the surface energy of the mud cake from 34.99 to 8.17 m J·m-2and increased the roughness of shale from 0.26 to 2.39 μm. These modifications rendered the mud cake and shale surfaces amphiphobic, effectively mitigating capillary infiltration and delaying the long-term strength degradation of shale in oil-based drilling fluids. After 28days of immersion in oil-based drilling fluid, shale cores treated with MF-SiO2exhibited a 30.5% increase in compressive strength compared to untreated cores. Additionally, these nanoparticles demonstrated the ability to penetrate and seal rock pores, reducing the API filtration volume of the drilling fluid from11.2 to 7.6 m L. This study introduces a novel approach to enhance the development of shale gas and oil resources, offering a promising strategy for wellbore stabilization in oil-based drilling fluid systems.展开更多
The lotus leaf,paradigmatic in superhydrophobic research,exhibits a water contact angle ofθ=160.4˚±1.5˚and a sliding angle of 2˚±1˚,enabled by its micro-/nano-hierarchical architecture.Herein,we report a fa...The lotus leaf,paradigmatic in superhydrophobic research,exhibits a water contact angle ofθ=160.4˚±1.5˚and a sliding angle of 2˚±1˚,enabled by its micro-/nano-hierarchical architecture.Herein,we report a facile two-step protocol—micro-texture replication followed by fluorination—to fabricate flexible,low-adhesion,superhydrophobic films.Using polydimethylsiloxane(PDMS,part A)and curing agent(part B)as the matrix,biomimetic micro-cones were faithfully duplicated from a master mold,with matched elastic modulus,thermal stability which can withstand extreme conditions of 300℃,as well as inert chemical stability(100% ethanol resistance).Subsequent va-por-phase grafting of 1H,1H,2H,2H-perfluorodecyltriethoxysilane(PFDS)yielded robust fluorocarbon chains oriented outward,minimizing surface en-ergy.The resulting film possesses a static water contact angle of 158.3˚±1.2˚and a sliding angle of 3.1˚±0.4˚,surpassing the conventional benchmarks(WCA≥150˚,SA≤10˚).The material demonstrates significant potential for self-cleaning solar panels,anti-icing aircraft coatings,and corrosion-resistant marine surfaces.展开更多
文摘Superhydrophobic aluminum surfaces with a high water contact angle and low sliding angle on aluminum plate substrate were fabricated by means of surface etching with sodium hydroxide under ultrasonic bathing and then modification with fluorosilane. Scanning electron microscopy（SEM） showed a honeycomb-like structure on aluminum substrate surface after etching under ultrasonic bathing. And the surface was rendered from superhydrophilicity to superhydrophobicity after further modification with fluorosilane.
基金support from the National Natural:Science Foundation of China(NO.52174014)the National Natural Science Foundation Basic Science Center(NO.52288101).
文摘Oil-based drilling fluids possess excellent properties such as shale inhibition, cuttings suspension, and superior lubrication, making them essential in the development of unconventional oil and gas reservoirs.However, wellbore instability, caused by the invasion of drilling fluids into shale formations, remains a significant challenge for the safe and efficient extraction of shale oil and gas. This work reports the preparation of mesoporous SiO2nanoparticles with low surface energy, utilized as multifunctional agents to enhance the performance of oil-based drilling fluids aimed at improving wellbore stability. The results indicate that the coating prepared from these nanoparticles exhibit excellent hydrophobicity and antifouling properties, increasing the water contact angle from 32°to 146°and oil contact angle from 24°to134.8°. Additionally, these nanoparticles exhibit exceptional chemical stability and thermal resistance.Incorporating these nanoparticles into oil-based drilling fluids reduced the surface energy of the mud cake from 34.99 to 8.17 m J·m-2and increased the roughness of shale from 0.26 to 2.39 μm. These modifications rendered the mud cake and shale surfaces amphiphobic, effectively mitigating capillary infiltration and delaying the long-term strength degradation of shale in oil-based drilling fluids. After 28days of immersion in oil-based drilling fluid, shale cores treated with MF-SiO2exhibited a 30.5% increase in compressive strength compared to untreated cores. Additionally, these nanoparticles demonstrated the ability to penetrate and seal rock pores, reducing the API filtration volume of the drilling fluid from11.2 to 7.6 m L. This study introduces a novel approach to enhance the development of shale gas and oil resources, offering a promising strategy for wellbore stabilization in oil-based drilling fluid systems.
文摘The lotus leaf,paradigmatic in superhydrophobic research,exhibits a water contact angle ofθ=160.4˚±1.5˚and a sliding angle of 2˚±1˚,enabled by its micro-/nano-hierarchical architecture.Herein,we report a facile two-step protocol—micro-texture replication followed by fluorination—to fabricate flexible,low-adhesion,superhydrophobic films.Using polydimethylsiloxane(PDMS,part A)and curing agent(part B)as the matrix,biomimetic micro-cones were faithfully duplicated from a master mold,with matched elastic modulus,thermal stability which can withstand extreme conditions of 300℃,as well as inert chemical stability(100% ethanol resistance).Subsequent va-por-phase grafting of 1H,1H,2H,2H-perfluorodecyltriethoxysilane(PFDS)yielded robust fluorocarbon chains oriented outward,minimizing surface en-ergy.The resulting film possesses a static water contact angle of 158.3˚±1.2˚and a sliding angle of 3.1˚±0.4˚,surpassing the conventional benchmarks(WCA≥150˚,SA≤10˚).The material demonstrates significant potential for self-cleaning solar panels,anti-icing aircraft coatings,and corrosion-resistant marine surfaces.
