Magnesium and its alloys have gained relevance for their light-weight combined with a high value of strength-to-weight ratio,which makes them useful in fields such as aerospace,automotive as well as biomedical enginee...Magnesium and its alloys have gained relevance for their light-weight combined with a high value of strength-to-weight ratio,which makes them useful in fields such as aerospace,automotive as well as biomedical engineering.Unfortunately,the poor corrosion resistance of Mg-alloys limits their wide acceptance.Advanced composite coatings which are self-healing,superhydrophobic anti corrosive,and wear resistant are new synthetic materials for abating these challenges.The superimposed superhydrophobic surfaces help in minimizing their water contact,thus slowing down the electrochemical reactions on the surface of the alloys,while their self-healing characteristics autonomously aid in the repair of any induced micro-crack,defect or damage towards ensuring the metal's long-term protection.In addition,the integration of wear-resistant materials further improves the durability of coatings under mechanical stress.The most recent research efforts have been directed towards the preparation of multifunctional composites,with an emphasis on nanomaterials,functional polymers,and state-of-the-art fabrication techniques in order to take advantage of their synergistic effects.Some of the methods that have so far exhibited promising potentials in fabricating these materials include the sol-gel method,layer-by-layer assembly,and plasma treatments.However,most of the fabricated products are still faced with significant challenges ranging from long-term stability to homogeneous adhesion of the coatings and their scalability for industrial applications.This review discusses the recent progress and the relationship between corrosion inhibition and self-healing efficiencies of wear resistant polymer nanocomposite coatings.Some challenges related to optimizing coating performance were also discussed.In addition,future directions ranging from the consideration of bioinspired designs,novel hybrid nanocomposite materials,and environmentally sustainable solutions integrated with smart protective coatings were also proposed as new wave technologies that can potentially revolutionize the corrosion protection offered by Mg alloys while opening up prospects for improved performance and sustainability.展开更多
Superhydrophobic surface is a promising strategy for antibacterial and corrosion protection.However,the use of harmful fluorine-containing materials,poor mechano-chemical stability,the addition of fungicides and poor ...Superhydrophobic surface is a promising strategy for antibacterial and corrosion protection.However,the use of harmful fluorine-containing materials,poor mechano-chemical stability,the addition of fungicides and poor corrosion resistance often limit its practical application.In this paper,a high-robustness pho-tothermal self-healing superhydrophobic coating is prepared by simply spraying a mixture of hydropho-bically modified epoxy resin and two kinds of modified nanofillers(carbon nanotubes and SiO2)for long-term anticorrosion and antibacterial applications.Multi-scale network and lubrication structures formed by cross-linking of modified carbon nanotubes and repeatable roughness endow coating with high ro-bustness,so that the coating maintains superhydrophobicity even after 100 Taber abrasion cycles,20 m sandpaper abrasion and 100 tape peeling cycles.The synergistic effect of antibacterial adhesion and pho-tothermal bactericidal activity endows coating with excellent antibacterial efficiency,which against Es-cherichia coli(E.coli)and Staphylococcus aureus(S.aureus)separately reaches 99.6% and 99.8%.Moreover,the influence of modified epoxy resin,superhydrophobicity,organic coating and coating thicknesses on the anticorrosion of magnesium(Mg)alloy is systematically studied and analyzed.More importantly,the prepared coating still exhibits excellent self-cleaning,anticorrosion and antibacterial abilities after 20 m abrasion.Furthermore,the coating exhibits excellent adhesion(level 4B),chemical stability,UV radiation resistance,high-low temperature alternation resistance,stable heat production capacity and photother-mal self-healing ability.All these excellent performances can promote its application in a wider range of fields.展开更多
As one of the lightest engineering materials,magnesium(Mg)alloy possesses excellent mechanical performance,meeting the needs of versatile engineering fields and holding the potential to address cutting-edge issues in ...As one of the lightest engineering materials,magnesium(Mg)alloy possesses excellent mechanical performance,meeting the needs of versatile engineering fields and holding the potential to address cutting-edge issues in aerospace,electronics,biomedicine.The design of superhydrophobic(SHB)surfaces with micro and nanostructures can endow Mg alloys with multiple functionalities,such as self-cleaning,self-healing,antibacterial,and corrosion resistance.Over the past decade,researchers have drawn inspiration from nature to implement biomimetic design principles,resulting in the rapid development of micro/nanostructured SHB surfaces on Mg alloys,which hold great promise for biomedical applications.This review comprehensively introduces the biomimetic design principles of micro/nanostructured SHB surfaces on Mg alloys,discusses the challenges along with advantages and disadvantages of current preparation methods,and explores the future perspectives for preparing these SHB surfaces,providing strategies to enhance their performance in biomedical applications.展开更多
Separating oil/water mixtures via superhydrophobic stainless steel mesh(SSM)is a kind of efficient methods of treating oily wastewater,and the superhydrophobic SSM with a low cost,simple fabrication process and robust...Separating oil/water mixtures via superhydrophobic stainless steel mesh(SSM)is a kind of efficient methods of treating oily wastewater,and the superhydrophobic SSM with a low cost,simple fabrication process and robust usability remains a challenge.Herein,urushiol-based benzoxazine(U-D)with a strong substrate adhesion and low surface free energy was used to anchor SiO_(2) particles on the SSM surface to obtain a durable superhydrophobic SSM(PU-D/SiO_(2)/SSM)through a simple dip-coating process,meanwhile,epoxy resin was also introduced to further improve the adhesion between coating and SSM.PU-D/SiO_(2)/SSM could successfully separate various immiscible oil-water mixtures with a separation efficiency of over 96%and a flux up to 27100 L/m^(2) h only by gravity,respectively.Especially,the modified SSM could effectively remove water from water-in-oil emulsion with a separation efficiency of 99.7%.Moreover,PU-D/SiO_(2)/SSM had an outstanding reusability,whose water contact angle and separation efficiency only slightly decreased after 20 cycles of separating oil/water mixture.In addition,the modified SSM also displayed a satisfactory abrasion resistance,chemical stability and self-cleaning property.Thereby,the robust PU-D/SiO_(2)/SSM prepared by cheap raw materials and facile dip-coating method exhibits a high potential for separating oil/water mixtures.展开更多
Cu–Ni and Cu–Co–Ni superhydrophobic films were constructed on the surface of B10 copper–nickel alloy welded joints using a two-step process of electrodeposition and stearic acid modification.The chemical compositi...Cu–Ni and Cu–Co–Ni superhydrophobic films were constructed on the surface of B10 copper–nickel alloy welded joints using a two-step process of electrodeposition and stearic acid modification.The chemical composition of the film surface was determined using surface characterization techniques.The corrosion resistance of the films was characterized using electrochemical impedance spectroscopy,potentiodynamic polarization,and scanning Kelvin probe microscopy at multiple scales.The thermal stability,mechanical stability,and self-cleaning properties of the films were also characterized.It was determined that the Cu–Co–Ni superhydrophobic film exhibited the best performance,with a static water contact angle of 159.3°,a roll-off angle of 2.3°,a charge transfer resistance 3300 times higher than the substrate,a self-corrosion current density nearly three orders of magnitude lower,and a surface Kelvin potential increase of 420 mV.The film demonstrated good thermal stability,excellent mechanical stability,and outstanding self-cleaning properties.Combining with previous studies,it was found that Co elements in the film contribute to the formation of a uniform and dense film,Ni elements enhance the adhesion and corrosion resistance between the films,and the combination of Co and Ni elements promotes uniform surface potential and further improves the corrosion resistance and interfilm adhesion of the films.展开更多
As an efficient passive anti-icing method,the superhydrophobic surface can reduce icing process on metals in low temperatures.However,the usual organic low-surface-energy decorations are often prone to age especially ...As an efficient passive anti-icing method,the superhydrophobic surface can reduce icing process on metals in low temperatures.However,the usual organic low-surface-energy decorations are often prone to age especially in harsh environments,leading to a decrease or complete failure of the anti-icing performance.Here,we adopt a fabrication method of femtosecond laser element-doping microstructuring to achieve inor-ganic superhydrophobic aluminum alloys surfaces through simultaneously modifying the surface profile and compositions of aluminum alloys.The obtained bionic anthill tribe structure with the low thermal conductiv-ity,exhibits the superior delayed freezing time(803.3 s)and the low ice adhesion(16μN)in comparison to the fluorosilane modified and bare Al surfaces.Moreover,such an inherently superhydrophobic metal sur-face also shows the exceptional environmental durability in anti-icing performance,which confirms the ef-fectiveness of our superhydrophobic surface without the need for organic coatings.展开更多
Superhydrophobicity endows various substrates with astonishing multifunctional properties and has received widespread praise in industrial production.However,the fragile connection between the coating and the substrat...Superhydrophobicity endows various substrates with astonishing multifunctional properties and has received widespread praise in industrial production.However,the fragile connection between the coating and the substrate not only limits the service life of superhydrophobic coatings,but also poses limitations.To address this issue,this study used 3-(perfluorooctyl)propanol and organic polysilazane(OPSZ)with universal anchoring properties as starting materials to obtain fluorine modified OPSZ through a one-step synthesis method,and then doped SiO_(2)micro nano particles to produce superhydrophobic coatings that can be widely applied to various substrates.Investigating the relationship between the hydrophobic properties of the coatings and the amounts of SiO_(2)microparticles and nanoparticles used to create the microscopic rough structure of the superhydrophobic coatings,it was discovered that the hydrophobic properties of the coatings tended to increase as the number of nanoparticles increased.The water contact angle of prepared coatings was still over 157°after 48 h of UV exposure or 180 days of exposure to air.The heat resistance of the created superhydrophobic coatings was tested in a muffle furnace at 400℃ for 2 h.The results revealed that the coatings maintained their water contact angle of 155.1°±3.01°and water sliding angle of 6.4°±1.98°,demonstrating their excellent heat resistance and suitability for use in a variety of high-temperatu re environme nts.The work provided a practical way for creating superhydrophobic composite coatings with excellent mechanical stability,acid and alkali corrosion resistance,and heat resistance,and had potential application in antifouling and anti-corrosion.展开更多
Surface modification is found to be an effective way to control the initial degradation of Mg based biomedical alloys.The present study focuses on the modulation of in vitro and in vivo degradation behavior of Mg-Ce a...Surface modification is found to be an effective way to control the initial degradation of Mg based biomedical alloys.The present study focuses on the modulation of in vitro and in vivo degradation behavior of Mg-Ce alloy through a stearic acid-treated polypyrrole coating,which developed superhydrophobic surface(contact angle∼153°)that drastically enhanced the corrosion resistance(more than 85%efficacy).Cerium addition to Mg alloy results basal texture strengthening and grain refinement,resulting in improved mechanical properties.All the specimens exhibited excellent antibacterial performance against gram-negative E.Coli(DH5α)and gram positive S.aureus bacteria.The oligodynamic effect of polypyrrole coating leads to complete bacterial mitigation.Non-toxic nature of the specimens was studied by MC3T3-E1 cell proliferation and differentiation in indirect cell culture method.Improved corrosion resistance of the coated specimen leads to enhanced cell proliferation and osteogenic differentiation.Hard tissue histology and micro-CT analysis exhibited higher fraction of newly formed callus tissues and highest bone-implant integration across the coated specimen,when implanted in rabbit femur.Efficacy of the material in fracture healing was evaluated by implanting bone plate and screw in a clinically fractured goat tibia.At 3 months,complete fracture healed with no vital organ toxicity was observed for the coated specimen.The present results suggest that Ce addition and polypyrrole coating are effective ways to modulate the corrosion and biocompatibility behavior making it a potential candidate for fracture fixation applications.展开更多
A two-step approach was employed to create a composite coating consisting of TiO_(2)nanoparticles and extremely elastic polydimethylsiloxane(PDMS).The TiO_(2)-PDMS composite coating demonstrates exceptional superhydro...A two-step approach was employed to create a composite coating consisting of TiO_(2)nanoparticles and extremely elastic polydimethylsiloxane(PDMS).The TiO_(2)-PDMS composite coating demonstrates exceptional superhydrophobicity and antifouling efficacy,as evidenced by the static contact angle,contact angle hysteresis,and antifouling tests.The electron microscopic analysis reveals that the composite coating consists of TiO_(2)particles and agglomerates,which forms a dual-level roughness structure at the nanometer and micron scales.This unique structure promotes the Cassie-Baxter state of the coating when in contact with the liquid,resulting in an increased static contact angle and a reduced contact angle hysteresis.The PDMS primer facilitates the attachment of TiO_(2)particles,resulting in a composite coating with excellent scratch-resistant characteristics.Additionally,the PDMS primer possesses the capacity to retain low surface energy modifiers.Simultaneously,the PDMS primer serves as a reservoir for a low surface energy modifier,enhancing the self-repairing properties of the TiO_(2)-PDMS composite coating.This composite coating exhibits effective self-cleaning capabilities against many forms of contaminants,including liquids,solids,and slurries.展开更多
Superhydrophobic glass has inspiring development prospects in endoscopes,solar panels and other engineering and medical fields.However,the surface topography required to achieve superhydrophobicity will inevitably aff...Superhydrophobic glass has inspiring development prospects in endoscopes,solar panels and other engineering and medical fields.However,the surface topography required to achieve superhydrophobicity will inevitably affect the surface transparency and limit the application of glass materials.To resolve the contradiction between the surface transparency and the robust superhydrophobicity,an efficient and low-cost laser-chemical surface functionalization process was utilized to fabricate superhydrophobic glass surface.The results show that the air can be effectively trapped in surface micro/nanostructure induced by laser texturing,thus reducing the solid-liquid contact area and interfacial tension.The deposition of hydrophobic carbon-containing groups on the surface can be accelerated by chemical treatment,and the surface energy is significantly reduced.The glass surface exhibits marvelous robust superhydrophobicity with a contact angle of 155.8°and a roll-off angle of 7.2°under the combination of hierarchical micro/nanostructure and low surface energy.Moreover,the surface transparency of the prepared superhydrophobic glass was only 5.42%lower than that of the untreated surface.This superhydrophobic glass with high transparency still maintains excellent superhydrophobicity after durability and stability tests.The facile fabrication of superhydrophobic glass with high transparency and robustness provides a strong reference for further expanding the application value of glass materials.展开更多
Functional superhydrophobic coatings have attracted considerable attention because of their potential for a wide range of applications.In this study,a novel cyclotetrasiloxane-based hybrid superhydrophobic modifier(F-...Functional superhydrophobic coatings have attracted considerable attention because of their potential for a wide range of applications.In this study,a novel cyclotetrasiloxane-based hybrid superhydrophobic modifier(F-D_(4))was prepared for the first time using a mild thiolene click reaction of 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane(Vi-D_(4))with perfluorohexylethanethiol(PFOT)and mercaptopropyltrimethoxysilane(MPTMS)as the raw materials.Then,F-D_(4) was introduced into the fabric via a sol-gel process,resulting in a superhydrophobic fabric(F-D_(4)-Fabric).The surface characteristics of the modified fabric were determined using scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),and water contact angle(WCA).The coated fabrics have outstanding mechanical,physical,and chemical stability,and exhibit excellent self-cleaning and anti-fouling properties.Owing to its superhydrophobicity,FD_(4)-Fabric could efficiently separate a range of oil/water mixtures with a separation efficiency of up to 99.99%.The study showed that the modification strategy used in the dip-coating process greatly affected the superhydrophobicity of the cotton fabric,which is useful for oil/water separation and self-cleaning applications.展开更多
On-demand droplet manipulation plays a critical role in microfluidics,bio/chemical detection and microreactions.Acoustic droplet manipulation has emerged as a promising technique due to its non-contact nature,biocompa...On-demand droplet manipulation plays a critical role in microfluidics,bio/chemical detection and microreactions.Acoustic droplet manipulation has emerged as a promising technique due to its non-contact nature,biocompatibility and precision,circumventing the complexities associated with other methods requiring surface or droplet pretreatment.Despite their promise,existing methods for acoustic droplet manipulation often involve complex hardware setups and difficulty for controlling individual droplet amidst multiple ones.Here we fabricate simple yet effective acoustic tweezers for in-surface and out-of-surface droplet manipulation.It is found that droplets can be transported on the superhydrophobic surfaces when the acoustic radiation force surpasses the friction force.Using a two-axis acoustic tweezer,droplets can be maneuvered along arbitrarily programmed paths on the surfaces.By introducing multiple labyrinthine structures on the superhydrophobic surface,individual droplet manipulation is realized by constraining the unselected droplets in the labyrinthine structures.In addition,a three-axis acoustic tweezer is developed for manipulating droplets in three-dimensional space.Potential applications of the acoustic tweezers for micro-reaction,bio-assay and chemical analysis are also demonstrated.展开更多
To improve the practical application of carbon steel,developing a superhydrophobic coating with outstanding mechanical properties is essential for effective corrosion resistance protection.Here,we obtained a robust su...To improve the practical application of carbon steel,developing a superhydrophobic coating with outstanding mechanical properties is essential for effective corrosion resistance protection.Here,we obtained a robust superhydrophobic anti-corrosion coating with a cauliflower structure by co-depositing the lauric acid with Ni ions and Mn ions onto a carbon steel through electrodeposition method.As demonstrated by the results,superhydrophobic Ni/Mn alloy(SNMAmit)displays a multi-hierarchical micro/nano cauliflower structure under the synergy of optimal parameters,exhibiting superb superhydrophobicity with contact angle of 161.9°and sliding angle of 6.2°.Surprisingly,the Tafel polarization curves in 3.5%NaCl showed that the corrosion potential of SNMAmit coating was 476 mV,and the corrosion current density was reduced from 1.39×10^(−5)to 5.89×10^(−7)A/cm^(2).The reduced corrosion current density of superhydrophobic Ni/Mn alloy(SNMA)indicates that SNMA coating can significantly enhance the anti-corrosion properties of carbon steel.In addition,after being subjected to various damages such as blade scraping,tape cyclic peeling,acid and alkalis,sandpaper cyclic abrasion,high temperatures,ultrasound,and graphite contaminant,SNMA showed good mechanical stability,interference resistance,heat resistance,and self-cleaning properties,which made it suitable for hostile conditions.展开更多
Effective antifouling coatings are critical for protecting marine infrastructure from biofouling and environmental degradation;however,achieving long-term antifouling performance along with environmental stability rem...Effective antifouling coatings are critical for protecting marine infrastructure from biofouling and environmental degradation;however,achieving long-term antifouling performance along with environmental stability remains a major challenge.In this study,a multifunctional bio-based epoxy coating is developed by integrating a dual-action antifouling system.Cinnamic acid(CA),which is known for its antibacterial and UV-shielding properties,was chemically grafted into ethylene glycol diglycidyl ether(EGDE)to provide intrinsic antifouling and anti-UV functions.Simultaneously,the KH560-modified silica aerogel was incorporated to create a dense hydrophobic surface that repels microorganism adhesion.The resulting coating exhibited a superhydrophobic contact angle of 154.3°,an ultralow surface energy,and exceptional resistance to protein and algal adhesion.Additionally,it achieves 99%bactericidal efficiency against Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)while maintaining high transparency and ease of processing.These results highlight a promising strategy for designing durable and ecofriendly antifouling coatings suitable for demanding marine environments.展开更多
Extracting ethanol from aqueous solutions is important but challenging in industry.Pervaporation membranes show great promise for separating ethanol from water,with the design of their structure being crucial for enha...Extracting ethanol from aqueous solutions is important but challenging in industry.Pervaporation membranes show great promise for separating ethanol from water,with the design of their structure being crucial for enhancing performance.In this study,we developed an oriented bimetallic metal-organic framework(MOF)membrane,designated as ZIF-CoZn,for the pervaporation separation of ethanol from water.During crystal growth,bimetallic salts provide specific nucleation sites,and the competitive coordination between Co and Zn ions shifts the energetically favorable(100)plane to the(211)plane.This orientation enables precise molecular-level control over hydrophobic ligand arrangement,effectively repelling water molecules.Meanwhile,bimetallic competition enlarges pore sizes,facilitating ethanol permeation.When compared to single-metal MOF membranes made of cobalt or zinc,the separation factor of the ZIF-CoZn membrane for ethanol/water mixtures increased by 127%and 160%,respectively.Benefiting from the high roughness and increased exposure of hydrophobic ligands due to the preferential(211)orientation,ZIF-CoZn exhibits superhydrophobicity after vinyl-polydimethylsiloxane coating.The oriented ZIF-CoZn membrane was also scaled up to an area of 1 m^(2).This work provides valuable insights into optimizing MOF membrane structure and lays the foundation for its promotion and application in the industry.展开更多
In low-temperature environments,the condensation and icing phenomena of water molecules on material sur-faces may adversely affect the functionality and durability of various products,so it is critical to improve the ...In low-temperature environments,the condensation and icing phenomena of water molecules on material sur-faces may adversely affect the functionality and durability of various products,so it is critical to improve the antiicing properties of material surfaces.In this study,the anti-icing mechanism of superhydrophobic coatings was analyzed based on the surface wettability theory,and SiO_(2)/PDMS/EP superhydrophobic coating was fabricated by the spraying method.The surface wettability,surface micro-morphology,and surface chemical composition of the coating was characterized,and the stability of the coating as well as the anti-icing properties were investi-gated.The results show that the SiO_(2)/PDMS/EP superhydrophobic coating sprayed on the Al-based surface has a contact angle of 163.3° and a sliding angle of 4°,and the coating maintains excellent superhydrophobicity at a low temperature of-15°.This coating can significantly delay the freezing time and temperature of droplets on its surface,reduce the shear force and natural deicing time required to remove surface ice,and exhibit excellent anti-icing performance.The excellent anti-icing durability of the coating was demonstrated by the icing-deicing cycle experiment.Subsequently,the anti-frosting performance was further investigated,and the results showed that it effectively slowed down the speed of frost formation.Therefore,the superhydrophobic coating fabricated in this study is suitable for a wide range of working conditions and has potential practicality.It also provides experimental guidance for the application of anti-icing coatings on Al surfaces.展开更多
Building a superhydrophobic coating on a carbon steel substrate is an effective strategy for enhancing metal protection.A practical approach to producing a series of superhydrophobic Ni/SiO_(2)composite coatings(SSN)u...Building a superhydrophobic coating on a carbon steel substrate is an effective strategy for enhancing metal protection.A practical approach to producing a series of superhydrophobic Ni/SiO_(2)composite coatings(SSN)using one-step electrodeposition method is shown.The effect of processing parameters on surface structure and wettability was thoroughly explored,resulting in the identification of three typical surface morphologies.The prepared coating with petal-like structure(SSN-3)obtained under the optimum parameters exhibited the best water repellency,achieving a contact angle of 162.7°and a sliding angle of 4.1°.The droplet bouncing behavior on SSN coatings surface was studied,and the delayed icing time was recorded.Meanwhile,the mechanical stability and chemical corrosion resistance of SSN coatings were focused.The superhydrophobic SSN-3 coating with unique surface structure exhibited excellent reliability.The anticorrosion mechanism of SSN-3 coating was discussed,and its corrosion protection efficiency was up to 98.5%.The superior properties of the superhydrophobic SSN-3 coating make it suitable for diverse applications.展开更多
The corrosion resistance of magnesium alloys is a significant concern in industries seeking to use these materials for lightweight structures.Plasma electrolytic oxidation(PEO)is a process that forms a ceramic oxide f...The corrosion resistance of magnesium alloys is a significant concern in industries seeking to use these materials for lightweight structures.Plasma electrolytic oxidation(PEO)is a process that forms a ceramic oxide film on Mg alloy surfaces,effectively enhancing their corrosion performance in the short term.In this regard,optimizing PEO process parameters is crucial for creating a stable oxide layer.An improved level of corrosion resistance is ensured by applying superhydrophobic coating(SHC)on top of the PEO layer to prevent moisture infiltration,creating air pockets on the surface.Various methods are employed to fabricate SHC on Mg alloys,including techniques like electrophoretic deposition(EPD),Hydrothermal(HT),dip,and spray coating.The synergistic combination of PEO and SHC coatings has demonstrated encouraging outcomes in enhancing the corrosion performance of Mg alloys.This study offers an extensive overview of recent progress in the preparation,characterization,and corrosion behavior of Mg alloys by employing PEO coatings and SHC treatment processes.展开更多
Inspired by the layered structure of dental enamel in the human body,a superhydrophobic coating with an elastic gradient was developed and placed on the inner wall of a gas transmission pipeline to reduce erosion and ...Inspired by the layered structure of dental enamel in the human body,a superhydrophobic coating with an elastic gradient was developed and placed on the inner wall of a gas transmission pipeline to reduce erosion and corrosion.The coating comprises a hard bionic superhydrophobic top coating and a hydrogel layer underneath for buffering and self-repair.To improve the impact resistance of the top coating,layered structures with different viscoelasticities were constructed by controlling the content of lauric acid(LA)@TiO_(2) particles and carbon nanotubes(CNTs).The amylose hydrogel underlayer not only acts as a shock absorber but also restores potential damage in the top layer,bringing an additional benefit to the corrosion resistance of the coating.Thanks to these three cooperative approaches,the coating exhibits excellent mechanical durability(800 cycles with 600-mesh sandpaper under a 49 kPa load)and corrosion resistance(with a corrosion potential of-0.21 V).Moreover,it maintains its superhydrophobicity after sanding,bending,soaking,and scratching,demonstrating its potential for application to protect transmission pipelines from erosion and corrosion.展开更多
We report a simple preparation method of a renewable superhydrophobic surface by thermally induced phase separation （TIPS） and mechanical peeling. Porous polyvinylidene fluoride （PVDF） membranes with hierarchical ...We report a simple preparation method of a renewable superhydrophobic surface by thermally induced phase separation （TIPS） and mechanical peeling. Porous polyvinylidene fluoride （PVDF） membranes with hierarchical structures were prepared by a TIPS process under different cooling conditions, which were confirmed by scanning electron microscopy and mercury intrusion porosimetry. After peeling off the top layer, rough structures with hundreds of nanometers to several microns were obtained. A digital microscopy determines that the surface roughness of peeled PVDF membranes is much higher than that of the original PVDF membrane, which is important to obtain the superhydrophobicity. Water contact angle and sliding angle measurements demonstrate that the peeled membrane surfaces display super- hydrophobicity with a high contact angle （152°） and a low sliding angle （7.2°）. Moreover, the superhydrophobicity can be easily recovered for many times by a simple mechanical peeling, identical to the original superhydrophobicity. This simple preparation method is low cost, and suitable for large-scale industrialization, which may offer more opportunities for practical applications.展开更多
文摘Magnesium and its alloys have gained relevance for their light-weight combined with a high value of strength-to-weight ratio,which makes them useful in fields such as aerospace,automotive as well as biomedical engineering.Unfortunately,the poor corrosion resistance of Mg-alloys limits their wide acceptance.Advanced composite coatings which are self-healing,superhydrophobic anti corrosive,and wear resistant are new synthetic materials for abating these challenges.The superimposed superhydrophobic surfaces help in minimizing their water contact,thus slowing down the electrochemical reactions on the surface of the alloys,while their self-healing characteristics autonomously aid in the repair of any induced micro-crack,defect or damage towards ensuring the metal's long-term protection.In addition,the integration of wear-resistant materials further improves the durability of coatings under mechanical stress.The most recent research efforts have been directed towards the preparation of multifunctional composites,with an emphasis on nanomaterials,functional polymers,and state-of-the-art fabrication techniques in order to take advantage of their synergistic effects.Some of the methods that have so far exhibited promising potentials in fabricating these materials include the sol-gel method,layer-by-layer assembly,and plasma treatments.However,most of the fabricated products are still faced with significant challenges ranging from long-term stability to homogeneous adhesion of the coatings and their scalability for industrial applications.This review discusses the recent progress and the relationship between corrosion inhibition and self-healing efficiencies of wear resistant polymer nanocomposite coatings.Some challenges related to optimizing coating performance were also discussed.In addition,future directions ranging from the consideration of bioinspired designs,novel hybrid nanocomposite materials,and environmentally sustainable solutions integrated with smart protective coatings were also proposed as new wave technologies that can potentially revolutionize the corrosion protection offered by Mg alloys while opening up prospects for improved performance and sustainability.
基金the National Natural Science Foundation of China(Nos.U2106226,52105297)the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(No.52021003)the Science and Technology Development Project of Jilin Province(Nos.20210203022SF,20210508029RQ).
文摘Superhydrophobic surface is a promising strategy for antibacterial and corrosion protection.However,the use of harmful fluorine-containing materials,poor mechano-chemical stability,the addition of fungicides and poor corrosion resistance often limit its practical application.In this paper,a high-robustness pho-tothermal self-healing superhydrophobic coating is prepared by simply spraying a mixture of hydropho-bically modified epoxy resin and two kinds of modified nanofillers(carbon nanotubes and SiO2)for long-term anticorrosion and antibacterial applications.Multi-scale network and lubrication structures formed by cross-linking of modified carbon nanotubes and repeatable roughness endow coating with high ro-bustness,so that the coating maintains superhydrophobicity even after 100 Taber abrasion cycles,20 m sandpaper abrasion and 100 tape peeling cycles.The synergistic effect of antibacterial adhesion and pho-tothermal bactericidal activity endows coating with excellent antibacterial efficiency,which against Es-cherichia coli(E.coli)and Staphylococcus aureus(S.aureus)separately reaches 99.6% and 99.8%.Moreover,the influence of modified epoxy resin,superhydrophobicity,organic coating and coating thicknesses on the anticorrosion of magnesium(Mg)alloy is systematically studied and analyzed.More importantly,the prepared coating still exhibits excellent self-cleaning,anticorrosion and antibacterial abilities after 20 m abrasion.Furthermore,the coating exhibits excellent adhesion(level 4B),chemical stability,UV radiation resistance,high-low temperature alternation resistance,stable heat production capacity and photother-mal self-healing ability.All these excellent performances can promote its application in a wider range of fields.
基金supported by the National Natural Science Found for Distinguished Young Scholars(52225101)the Fundamental Research Funds for the Central Universities(WUT:104972024RSCbs0018 and 2023CDJYXTD-002)+1 种基金the Natural Science Foundation of Chongqing(CSTB2023NSCQ-MSX0527)the Chongqing Academician Special Fund(2022YSZXJCX0014CSTB).
文摘As one of the lightest engineering materials,magnesium(Mg)alloy possesses excellent mechanical performance,meeting the needs of versatile engineering fields and holding the potential to address cutting-edge issues in aerospace,electronics,biomedicine.The design of superhydrophobic(SHB)surfaces with micro and nanostructures can endow Mg alloys with multiple functionalities,such as self-cleaning,self-healing,antibacterial,and corrosion resistance.Over the past decade,researchers have drawn inspiration from nature to implement biomimetic design principles,resulting in the rapid development of micro/nanostructured SHB surfaces on Mg alloys,which hold great promise for biomedical applications.This review comprehensively introduces the biomimetic design principles of micro/nanostructured SHB surfaces on Mg alloys,discusses the challenges along with advantages and disadvantages of current preparation methods,and explores the future perspectives for preparing these SHB surfaces,providing strategies to enhance their performance in biomedical applications.
基金Funded by the National Natural Science Foundation of China(No.22165019)。
文摘Separating oil/water mixtures via superhydrophobic stainless steel mesh(SSM)is a kind of efficient methods of treating oily wastewater,and the superhydrophobic SSM with a low cost,simple fabrication process and robust usability remains a challenge.Herein,urushiol-based benzoxazine(U-D)with a strong substrate adhesion and low surface free energy was used to anchor SiO_(2) particles on the SSM surface to obtain a durable superhydrophobic SSM(PU-D/SiO_(2)/SSM)through a simple dip-coating process,meanwhile,epoxy resin was also introduced to further improve the adhesion between coating and SSM.PU-D/SiO_(2)/SSM could successfully separate various immiscible oil-water mixtures with a separation efficiency of over 96%and a flux up to 27100 L/m^(2) h only by gravity,respectively.Especially,the modified SSM could effectively remove water from water-in-oil emulsion with a separation efficiency of 99.7%.Moreover,PU-D/SiO_(2)/SSM had an outstanding reusability,whose water contact angle and separation efficiency only slightly decreased after 20 cycles of separating oil/water mixture.In addition,the modified SSM also displayed a satisfactory abrasion resistance,chemical stability and self-cleaning property.Thereby,the robust PU-D/SiO_(2)/SSM prepared by cheap raw materials and facile dip-coating method exhibits a high potential for separating oil/water mixtures.
基金fnancial support by the National Natural Science Foundation of China(Grant No.42176209)the Natural Science Foundation of Shandong Province(Grant No.ZR2021MD064).
文摘Cu–Ni and Cu–Co–Ni superhydrophobic films were constructed on the surface of B10 copper–nickel alloy welded joints using a two-step process of electrodeposition and stearic acid modification.The chemical composition of the film surface was determined using surface characterization techniques.The corrosion resistance of the films was characterized using electrochemical impedance spectroscopy,potentiodynamic polarization,and scanning Kelvin probe microscopy at multiple scales.The thermal stability,mechanical stability,and self-cleaning properties of the films were also characterized.It was determined that the Cu–Co–Ni superhydrophobic film exhibited the best performance,with a static water contact angle of 159.3°,a roll-off angle of 2.3°,a charge transfer resistance 3300 times higher than the substrate,a self-corrosion current density nearly three orders of magnitude lower,and a surface Kelvin potential increase of 420 mV.The film demonstrated good thermal stability,excellent mechanical stability,and outstanding self-cleaning properties.Combining with previous studies,it was found that Co elements in the film contribute to the formation of a uniform and dense film,Ni elements enhance the adhesion and corrosion resistance between the films,and the combination of Co and Ni elements promotes uniform surface potential and further improves the corrosion resistance and interfilm adhesion of the films.
文摘As an efficient passive anti-icing method,the superhydrophobic surface can reduce icing process on metals in low temperatures.However,the usual organic low-surface-energy decorations are often prone to age especially in harsh environments,leading to a decrease or complete failure of the anti-icing performance.Here,we adopt a fabrication method of femtosecond laser element-doping microstructuring to achieve inor-ganic superhydrophobic aluminum alloys surfaces through simultaneously modifying the surface profile and compositions of aluminum alloys.The obtained bionic anthill tribe structure with the low thermal conductiv-ity,exhibits the superior delayed freezing time(803.3 s)and the low ice adhesion(16μN)in comparison to the fluorosilane modified and bare Al surfaces.Moreover,such an inherently superhydrophobic metal sur-face also shows the exceptional environmental durability in anti-icing performance,which confirms the ef-fectiveness of our superhydrophobic surface without the need for organic coatings.
基金supported by the National Key Research and Development Program of China(2022YFC3004901-3)the National Natural Science Foundation of China(21908109)+2 种基金the Open Project of Key Laboratory of Fire Emergency Rescue Equipment of Ministry of Emergency Management of People's Republic of China(2020XFZB05)the Fundamental Research Funds for the Central Universities(30919011272)the Natural Science Foundation of Jiangsu Province(BK20180816)。
文摘Superhydrophobicity endows various substrates with astonishing multifunctional properties and has received widespread praise in industrial production.However,the fragile connection between the coating and the substrate not only limits the service life of superhydrophobic coatings,but also poses limitations.To address this issue,this study used 3-(perfluorooctyl)propanol and organic polysilazane(OPSZ)with universal anchoring properties as starting materials to obtain fluorine modified OPSZ through a one-step synthesis method,and then doped SiO_(2)micro nano particles to produce superhydrophobic coatings that can be widely applied to various substrates.Investigating the relationship between the hydrophobic properties of the coatings and the amounts of SiO_(2)microparticles and nanoparticles used to create the microscopic rough structure of the superhydrophobic coatings,it was discovered that the hydrophobic properties of the coatings tended to increase as the number of nanoparticles increased.The water contact angle of prepared coatings was still over 157°after 48 h of UV exposure or 180 days of exposure to air.The heat resistance of the created superhydrophobic coatings was tested in a muffle furnace at 400℃ for 2 h.The results revealed that the coatings maintained their water contact angle of 155.1°±3.01°and water sliding angle of 6.4°±1.98°,demonstrating their excellent heat resistance and suitability for use in a variety of high-temperatu re environme nts.The work provided a practical way for creating superhydrophobic composite coatings with excellent mechanical stability,acid and alkali corrosion resistance,and heat resistance,and had potential application in antifouling and anti-corrosion.
基金the financial assistance from Science and Engineering Research Board(SERBCRG/2020/002818/MMM).
文摘Surface modification is found to be an effective way to control the initial degradation of Mg based biomedical alloys.The present study focuses on the modulation of in vitro and in vivo degradation behavior of Mg-Ce alloy through a stearic acid-treated polypyrrole coating,which developed superhydrophobic surface(contact angle∼153°)that drastically enhanced the corrosion resistance(more than 85%efficacy).Cerium addition to Mg alloy results basal texture strengthening and grain refinement,resulting in improved mechanical properties.All the specimens exhibited excellent antibacterial performance against gram-negative E.Coli(DH5α)and gram positive S.aureus bacteria.The oligodynamic effect of polypyrrole coating leads to complete bacterial mitigation.Non-toxic nature of the specimens was studied by MC3T3-E1 cell proliferation and differentiation in indirect cell culture method.Improved corrosion resistance of the coated specimen leads to enhanced cell proliferation and osteogenic differentiation.Hard tissue histology and micro-CT analysis exhibited higher fraction of newly formed callus tissues and highest bone-implant integration across the coated specimen,when implanted in rabbit femur.Efficacy of the material in fracture healing was evaluated by implanting bone plate and screw in a clinically fractured goat tibia.At 3 months,complete fracture healed with no vital organ toxicity was observed for the coated specimen.The present results suggest that Ce addition and polypyrrole coating are effective ways to modulate the corrosion and biocompatibility behavior making it a potential candidate for fracture fixation applications.
基金Funded by the National Science and Technology Major Project(No.J2019-VII-0015-0155)the National Natural Science Foundation of China(No.51705533)。
文摘A two-step approach was employed to create a composite coating consisting of TiO_(2)nanoparticles and extremely elastic polydimethylsiloxane(PDMS).The TiO_(2)-PDMS composite coating demonstrates exceptional superhydrophobicity and antifouling efficacy,as evidenced by the static contact angle,contact angle hysteresis,and antifouling tests.The electron microscopic analysis reveals that the composite coating consists of TiO_(2)particles and agglomerates,which forms a dual-level roughness structure at the nanometer and micron scales.This unique structure promotes the Cassie-Baxter state of the coating when in contact with the liquid,resulting in an increased static contact angle and a reduced contact angle hysteresis.The PDMS primer facilitates the attachment of TiO_(2)particles,resulting in a composite coating with excellent scratch-resistant characteristics.Additionally,the PDMS primer possesses the capacity to retain low surface energy modifiers.Simultaneously,the PDMS primer serves as a reservoir for a low surface energy modifier,enhancing the self-repairing properties of the TiO_(2)-PDMS composite coating.This composite coating exhibits effective self-cleaning capabilities against many forms of contaminants,including liquids,solids,and slurries.
基金Projects(52105175,52305149)supported by the National Natural Science Foundation of ChinaProject(2242024RCB0035)supported by the Zhishan Young Scholar Program of Southeast University,China+5 种基金Project(BK20210235)supported by the Natural Science Foundation of Jiangsu Province,ChinaProject(2023MK042)supported by the State Administration for Market Regulation,ChinaProject(KJ2023003)supported by the Jiangsu Administration for Market Regulation,ChinaProjects(KJ(Y)202429,KJ(YJ)2023001)supported by the Jiangsu Province Special Equipment Safety Supervision Inspection Institute,ChinaProject(JSSCBS20210121)supported by the Jiangsu Provincial Innovative and Entrepreneurial Doctor Program,ChinaProject(1102002310)supported by the Technology Innovation Project for Returnees in Nanjing,China。
文摘Superhydrophobic glass has inspiring development prospects in endoscopes,solar panels and other engineering and medical fields.However,the surface topography required to achieve superhydrophobicity will inevitably affect the surface transparency and limit the application of glass materials.To resolve the contradiction between the surface transparency and the robust superhydrophobicity,an efficient and low-cost laser-chemical surface functionalization process was utilized to fabricate superhydrophobic glass surface.The results show that the air can be effectively trapped in surface micro/nanostructure induced by laser texturing,thus reducing the solid-liquid contact area and interfacial tension.The deposition of hydrophobic carbon-containing groups on the surface can be accelerated by chemical treatment,and the surface energy is significantly reduced.The glass surface exhibits marvelous robust superhydrophobicity with a contact angle of 155.8°and a roll-off angle of 7.2°under the combination of hierarchical micro/nanostructure and low surface energy.Moreover,the surface transparency of the prepared superhydrophobic glass was only 5.42%lower than that of the untreated surface.This superhydrophobic glass with high transparency still maintains excellent superhydrophobicity after durability and stability tests.The facile fabrication of superhydrophobic glass with high transparency and robustness provides a strong reference for further expanding the application value of glass materials.
基金financially supported by the National Key R&D Program of China(No.2022YFE0197000)。
文摘Functional superhydrophobic coatings have attracted considerable attention because of their potential for a wide range of applications.In this study,a novel cyclotetrasiloxane-based hybrid superhydrophobic modifier(F-D_(4))was prepared for the first time using a mild thiolene click reaction of 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane(Vi-D_(4))with perfluorohexylethanethiol(PFOT)and mercaptopropyltrimethoxysilane(MPTMS)as the raw materials.Then,F-D_(4) was introduced into the fabric via a sol-gel process,resulting in a superhydrophobic fabric(F-D_(4)-Fabric).The surface characteristics of the modified fabric were determined using scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),and water contact angle(WCA).The coated fabrics have outstanding mechanical,physical,and chemical stability,and exhibit excellent self-cleaning and anti-fouling properties.Owing to its superhydrophobicity,FD_(4)-Fabric could efficiently separate a range of oil/water mixtures with a separation efficiency of up to 99.99%.The study showed that the modification strategy used in the dip-coating process greatly affected the superhydrophobicity of the cotton fabric,which is useful for oil/water separation and self-cleaning applications.
基金supported by National Natural Science Foundation of China(Nos.12072381,22072185,21805315)Guangdong Basic and Applied Basic Research Foundation(No.2024A1515011812)Science and Technology Innovation Project of Guangzhou(No.202102020263).
文摘On-demand droplet manipulation plays a critical role in microfluidics,bio/chemical detection and microreactions.Acoustic droplet manipulation has emerged as a promising technique due to its non-contact nature,biocompatibility and precision,circumventing the complexities associated with other methods requiring surface or droplet pretreatment.Despite their promise,existing methods for acoustic droplet manipulation often involve complex hardware setups and difficulty for controlling individual droplet amidst multiple ones.Here we fabricate simple yet effective acoustic tweezers for in-surface and out-of-surface droplet manipulation.It is found that droplets can be transported on the superhydrophobic surfaces when the acoustic radiation force surpasses the friction force.Using a two-axis acoustic tweezer,droplets can be maneuvered along arbitrarily programmed paths on the surfaces.By introducing multiple labyrinthine structures on the superhydrophobic surface,individual droplet manipulation is realized by constraining the unselected droplets in the labyrinthine structures.In addition,a three-axis acoustic tweezer is developed for manipulating droplets in three-dimensional space.Potential applications of the acoustic tweezers for micro-reaction,bio-assay and chemical analysis are also demonstrated.
基金the National Natural Science Foundation of China(U21A2057)the Natural Science Foundation of Chongqing(No.cstc2021jcyj-msxmX1139)the Science and Technology Research Program of Chongqing Municipal Education Commission(Nos.KJZD-M202301201 and KJZD-K202304502).
文摘To improve the practical application of carbon steel,developing a superhydrophobic coating with outstanding mechanical properties is essential for effective corrosion resistance protection.Here,we obtained a robust superhydrophobic anti-corrosion coating with a cauliflower structure by co-depositing the lauric acid with Ni ions and Mn ions onto a carbon steel through electrodeposition method.As demonstrated by the results,superhydrophobic Ni/Mn alloy(SNMAmit)displays a multi-hierarchical micro/nano cauliflower structure under the synergy of optimal parameters,exhibiting superb superhydrophobicity with contact angle of 161.9°and sliding angle of 6.2°.Surprisingly,the Tafel polarization curves in 3.5%NaCl showed that the corrosion potential of SNMAmit coating was 476 mV,and the corrosion current density was reduced from 1.39×10^(−5)to 5.89×10^(−7)A/cm^(2).The reduced corrosion current density of superhydrophobic Ni/Mn alloy(SNMA)indicates that SNMA coating can significantly enhance the anti-corrosion properties of carbon steel.In addition,after being subjected to various damages such as blade scraping,tape cyclic peeling,acid and alkalis,sandpaper cyclic abrasion,high temperatures,ultrasound,and graphite contaminant,SNMA showed good mechanical stability,interference resistance,heat resistance,and self-cleaning properties,which made it suitable for hostile conditions.
基金financially supported by the National Natural Science Foundation of China(Nos.U23A20589 and E52307038)China Postdoctoral Science Foundation(No.2023M743622)+3 种基金Zhejiang Provincial Natural Science Foundation of China(No.LQ23E030006)Ningbo 2025 Key Scientific Research Programs(Nos.2022Z111,2022Z160,and 2022Z198)Natural Science Foundation of Ningbo City(Nos.2022J302 and 2024J122)Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(No.2021R01005)。
文摘Effective antifouling coatings are critical for protecting marine infrastructure from biofouling and environmental degradation;however,achieving long-term antifouling performance along with environmental stability remains a major challenge.In this study,a multifunctional bio-based epoxy coating is developed by integrating a dual-action antifouling system.Cinnamic acid(CA),which is known for its antibacterial and UV-shielding properties,was chemically grafted into ethylene glycol diglycidyl ether(EGDE)to provide intrinsic antifouling and anti-UV functions.Simultaneously,the KH560-modified silica aerogel was incorporated to create a dense hydrophobic surface that repels microorganism adhesion.The resulting coating exhibited a superhydrophobic contact angle of 154.3°,an ultralow surface energy,and exceptional resistance to protein and algal adhesion.Additionally,it achieves 99%bactericidal efficiency against Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)while maintaining high transparency and ease of processing.These results highlight a promising strategy for designing durable and ecofriendly antifouling coatings suitable for demanding marine environments.
基金the funding from the National Key Research and Development Program of China(No.2022YFB3804802)the National Natural Science Foundation of China(22125801,22478012)Beijing Natural Science Foundation(Z230023)。
文摘Extracting ethanol from aqueous solutions is important but challenging in industry.Pervaporation membranes show great promise for separating ethanol from water,with the design of their structure being crucial for enhancing performance.In this study,we developed an oriented bimetallic metal-organic framework(MOF)membrane,designated as ZIF-CoZn,for the pervaporation separation of ethanol from water.During crystal growth,bimetallic salts provide specific nucleation sites,and the competitive coordination between Co and Zn ions shifts the energetically favorable(100)plane to the(211)plane.This orientation enables precise molecular-level control over hydrophobic ligand arrangement,effectively repelling water molecules.Meanwhile,bimetallic competition enlarges pore sizes,facilitating ethanol permeation.When compared to single-metal MOF membranes made of cobalt or zinc,the separation factor of the ZIF-CoZn membrane for ethanol/water mixtures increased by 127%and 160%,respectively.Benefiting from the high roughness and increased exposure of hydrophobic ligands due to the preferential(211)orientation,ZIF-CoZn exhibits superhydrophobicity after vinyl-polydimethylsiloxane coating.The oriented ZIF-CoZn membrane was also scaled up to an area of 1 m^(2).This work provides valuable insights into optimizing MOF membrane structure and lays the foundation for its promotion and application in the industry.
基金supported by the National Key R&D Program of China(2022YFB3403304)the National Natural Science Foundation of China(NSFC,Grant No.52275420,U23A20632)the Natural Science Foundation of Hunan Province[Grant No.2022JJ30136].
文摘In low-temperature environments,the condensation and icing phenomena of water molecules on material sur-faces may adversely affect the functionality and durability of various products,so it is critical to improve the antiicing properties of material surfaces.In this study,the anti-icing mechanism of superhydrophobic coatings was analyzed based on the surface wettability theory,and SiO_(2)/PDMS/EP superhydrophobic coating was fabricated by the spraying method.The surface wettability,surface micro-morphology,and surface chemical composition of the coating was characterized,and the stability of the coating as well as the anti-icing properties were investi-gated.The results show that the SiO_(2)/PDMS/EP superhydrophobic coating sprayed on the Al-based surface has a contact angle of 163.3° and a sliding angle of 4°,and the coating maintains excellent superhydrophobicity at a low temperature of-15°.This coating can significantly delay the freezing time and temperature of droplets on its surface,reduce the shear force and natural deicing time required to remove surface ice,and exhibit excellent anti-icing performance.The excellent anti-icing durability of the coating was demonstrated by the icing-deicing cycle experiment.Subsequently,the anti-frosting performance was further investigated,and the results showed that it effectively slowed down the speed of frost formation.Therefore,the superhydrophobic coating fabricated in this study is suitable for a wide range of working conditions and has potential practicality.It also provides experimental guidance for the application of anti-icing coatings on Al surfaces.
基金the Natural Science Foundation of Chongqing of China(Nos.CSTB2024NSCQ-MSX1013 and cstc2021jcyj-msxmX1139)the Science and Technology Research Program of Chongqing Education Commission(Nos.KJZD-K202304502,KJQN202201214,KJQN202001243 and KJZD-M202301201)the Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan province(No.2024CL05).
文摘Building a superhydrophobic coating on a carbon steel substrate is an effective strategy for enhancing metal protection.A practical approach to producing a series of superhydrophobic Ni/SiO_(2)composite coatings(SSN)using one-step electrodeposition method is shown.The effect of processing parameters on surface structure and wettability was thoroughly explored,resulting in the identification of three typical surface morphologies.The prepared coating with petal-like structure(SSN-3)obtained under the optimum parameters exhibited the best water repellency,achieving a contact angle of 162.7°and a sliding angle of 4.1°.The droplet bouncing behavior on SSN coatings surface was studied,and the delayed icing time was recorded.Meanwhile,the mechanical stability and chemical corrosion resistance of SSN coatings were focused.The superhydrophobic SSN-3 coating with unique surface structure exhibited excellent reliability.The anticorrosion mechanism of SSN-3 coating was discussed,and its corrosion protection efficiency was up to 98.5%.The superior properties of the superhydrophobic SSN-3 coating make it suitable for diverse applications.
文摘The corrosion resistance of magnesium alloys is a significant concern in industries seeking to use these materials for lightweight structures.Plasma electrolytic oxidation(PEO)is a process that forms a ceramic oxide film on Mg alloy surfaces,effectively enhancing their corrosion performance in the short term.In this regard,optimizing PEO process parameters is crucial for creating a stable oxide layer.An improved level of corrosion resistance is ensured by applying superhydrophobic coating(SHC)on top of the PEO layer to prevent moisture infiltration,creating air pockets on the surface.Various methods are employed to fabricate SHC on Mg alloys,including techniques like electrophoretic deposition(EPD),Hydrothermal(HT),dip,and spray coating.The synergistic combination of PEO and SHC coatings has demonstrated encouraging outcomes in enhancing the corrosion performance of Mg alloys.This study offers an extensive overview of recent progress in the preparation,characterization,and corrosion behavior of Mg alloys by employing PEO coatings and SHC treatment processes.
基金supported by the National Natural Science Foundation of China(22375047,51972063,and 22075046)the National Key Research and Development Program of China(2022YFB3804905,2022YFB3804900,and 2019YFE0111200)+3 种基金the Natural Science Foundation for Distinguished Young Scholar of Fujian Province(2020J06038)the Natural Science Foundation of Fujian Province(2020J05098 and 2019J01256)111 Project(D17005)China Postdoctoral Science Foundation(2022M723497)。
文摘Inspired by the layered structure of dental enamel in the human body,a superhydrophobic coating with an elastic gradient was developed and placed on the inner wall of a gas transmission pipeline to reduce erosion and corrosion.The coating comprises a hard bionic superhydrophobic top coating and a hydrogel layer underneath for buffering and self-repair.To improve the impact resistance of the top coating,layered structures with different viscoelasticities were constructed by controlling the content of lauric acid(LA)@TiO_(2) particles and carbon nanotubes(CNTs).The amylose hydrogel underlayer not only acts as a shock absorber but also restores potential damage in the top layer,bringing an additional benefit to the corrosion resistance of the coating.Thanks to these three cooperative approaches,the coating exhibits excellent mechanical durability(800 cycles with 600-mesh sandpaper under a 49 kPa load)and corrosion resistance(with a corrosion potential of-0.21 V).Moreover,it maintains its superhydrophobicity after sanding,bending,soaking,and scratching,demonstrating its potential for application to protect transmission pipelines from erosion and corrosion.
基金This work is supported by the National Natural Science Foundation of China （No.51403107）, the Natural Science Foundation of Ningbo （No.2015A610014）, the Key Laboratory of Marine Materials and Related Tech- nologies （No.2016K07）, and K. C. Wong Magna Fund in Ningbo University.
文摘We report a simple preparation method of a renewable superhydrophobic surface by thermally induced phase separation （TIPS） and mechanical peeling. Porous polyvinylidene fluoride （PVDF） membranes with hierarchical structures were prepared by a TIPS process under different cooling conditions, which were confirmed by scanning electron microscopy and mercury intrusion porosimetry. After peeling off the top layer, rough structures with hundreds of nanometers to several microns were obtained. A digital microscopy determines that the surface roughness of peeled PVDF membranes is much higher than that of the original PVDF membrane, which is important to obtain the superhydrophobicity. Water contact angle and sliding angle measurements demonstrate that the peeled membrane surfaces display super- hydrophobicity with a high contact angle （152°） and a low sliding angle （7.2°）. Moreover, the superhydrophobicity can be easily recovered for many times by a simple mechanical peeling, identical to the original superhydrophobicity. This simple preparation method is low cost, and suitable for large-scale industrialization, which may offer more opportunities for practical applications.
