The wetting behavior of slag–coke is a crucial factor influencing the permeability of the lower part of the blast furnace.However,a systematic understanding of the wetting behavior and underlying mechanisms between t...The wetting behavior of slag–coke is a crucial factor influencing the permeability of the lower part of the blast furnace.However,a systematic understanding of the wetting behavior and underlying mechanisms between titanium-containing slag and tuyere coke remains lacking.The sessile drop method was employed to explore the effects of temperature,binary basicity,FeO,and TiO_(2) contents on the wetting behavior of titanium-containing slag and tuyere coke.The results indicate that increasing the temperature enhances the adhesion and wettability of the droplet,reducing the contact angle.Meanwhile,it accelerates the chemical reactions between slag and coke,leading to faster equilibrium.Conversely,increasing slag basicity elevates the contact angle by inhibiting chemical reactions at the slag–coke interface.This inhibition reduces both contact area and depth,thereby hindering slag droplet spreading on the coke surface.The contact angle decreases as the FeO content in the slag increases.Notably,the increase in TiO_(2) content has a dual effect on slag–coke wettability.Initially,it promotes wetting by reducing surface tension and lowering the contact angle.While the TiO_(2) content exceeds 20 wt.%,Ti(C,N)forms a barrier layer at the slag–coke interface,hindering the contact between slag and coke and resulting in an increased contact angle.展开更多
Based on the fact that rubbed groove patterns also affect the anchoring of liquid crystals at substrates,a quartic coupling is included in constructing the surface energy for a liquid crystal cell.The phase diagram an...Based on the fact that rubbed groove patterns also affect the anchoring of liquid crystals at substrates,a quartic coupling is included in constructing the surface energy for a liquid crystal cell.The phase diagram and the wetting behaviors of the liquid crystal cell,bounded by surfactant-laden interfaces in a magnetic field perpendicular to the substrate are discussed by taking the quartic coupling into account.The nematic order increases at the surface while it decreases in the bulk as a result of the introduction of quartic substrate-liquid crystal coupling,indicating that the groove anchoring makes the liquid crystal molecules align more orderly near the substrate than away from it.This causes a different wetting behavior：complete wetting.展开更多
The effects of the substrate-water interaction on the wetting behavior in water-oil and surfactant-water-oil systems confined by one substrate which has the preferential interaction to one species of particles have be...The effects of the substrate-water interaction on the wetting behavior in water-oil and surfactant-water-oil systems confined by one substrate which has the preferential interaction to one species of particles have been investigated by using the free energy analysis and discontinuous molecular dynamic simulations. As the preferential interaction between the substrate and water particles varies from small repulsion to large attraction, the partial drying, partial wetting and complete wetting state are observed in sequence. In addition, the wetting behavior of surfactant aqueous solution on the substrate is not only dependent on the interaction, but also limited by the maximum equilibrium concentration of surfactants at the interface.展开更多
Alkaline slag is vital in rare earth steel refining,making it crucial to study the wetting and penetration mechanisms between refractory materials and slag.The effect of Eu_(2)O_(3) doping on the sintering properties ...Alkaline slag is vital in rare earth steel refining,making it crucial to study the wetting and penetration mechanisms between refractory materials and slag.The effect of Eu_(2)O_(3) doping on the sintering properties of MgO-MgAl_(2)O_(4) refractory materials was investigated while simulating the wetting behavior between the refractory and the CaO-Al_(2)O_(3)-SiO_(2)-MgO quaternary alkaline slag during rare earth steel smelting to improve the material’s resistance to alkaline slag corrosion.The doping of Eu_(2)O_(3) can alter the crystal structure parameters of MgAl_(2)O_(4) and MgO,causing lattice distortion.This lattice activation promotes interionic mass and diffusion,helping reduce porosity and promote densification of the material,further improving sintering properties.At the equilibrium wetting temperature(1723 K),Eu_(2)O_(3) doping increases the interfacial free energy between the slag and refractory material,reducing the spreading coefficient of the molten slag.The contact angle increases from 32.1°to 42.2°,and the residual slag volume increases from 17.9%to 23.5%.The results of thermodynamic analysis show that MgAl_(2)O_(4) and EuAlO3 formed at the interface block the penetration of molten slag at high temperatures,improving the resistance of MgO-MgAl_(2)O_(4) refractories to alkaline slag corrosion.Based on the capillary theory model,it was calculated that the capillary tension of the slag gradually increases with the addition of Eu_(2)O_(3),while the theoretical penetration depth of the slag gradually decreases.The experimental results showed that the slag erosion depth of the sample decreased from 102.54 to 68.28μm.展开更多
Block copolymer lithography is emerging as one of the leading technologies for patteming nanoscale dense features. In almost all potential applications of this technology, control over the orientation of cylindrical a...Block copolymer lithography is emerging as one of the leading technologies for patteming nanoscale dense features. In almost all potential applications of this technology, control over the orientation of cylindrical and lamellar domains is required for pattern transfer from the block copolymer film. This review highlights the state-of-art development of brushes to modify the substrates to control the assembly behaviors of block copolymers in films. Selected important contributions to the development of self-assembled monolayers, polymer brushes and mats, and chemically patterned brushes are discussed.展开更多
Volcanic ashes are posing increasingly severer threats to the aviation safety.As the operation temperature of the turbine engine elevates,molten volcanic ash leads to the degradation of the thermal barrier coatings(TB...Volcanic ashes are posing increasingly severer threats to the aviation safety.As the operation temperature of the turbine engine elevates,molten volcanic ash leads to the degradation of the thermal barrier coatings(TBCs)and eventually catastrophic engine failure.However,the physical and chemical properties of volcanic ashes vary due to the distinct chemical compositions,rendering it extremely challenging to evaluate the effects of each ash material on the failure of TBC.Here,we proposed a new metric termed Basicity to investigate the influence of chemical composition on the melting temperature and viscosity of volcanic ashes.Artificial CaO-MgO-Al_(2)O_(3)-SiO_(2) materials(CMAS)were synthesized to simulate the wetting,spreading and corrosion behavior of volcanic ashes at 1300 ℃ on(Gd_(0.9)Yb_(0.1))2Zr_(2)O_(7)(GYbZ),a model TBC material.Our results reveal that the synthetic CMAS does not fully capture the damage caused by volcanic ash due to the difference in compositions.The viscosity and characteristic temperatures decrease as the Basicity value increases,indicating its significant impact on the fusion properties of ashes.Notably,distinct from CMAS,the unexpected presence of Fe_(2)O_(3) in volcanic ashes promotes the formation of garnet phase,conversely impedes the formation of apatite dense layer.These findings provide valuable insights into the corrosion mechanisms caused by TBC and strategies for TBC protection against volcanic ashes.展开更多
Wetting-dewetting behavior is a universal phenomenon for fluids on solid surfaces,for instance,the liquid on spider silk and lotus leaves[1].Controlling the wetting-dewetting behavior of fluids in a predictable and ge...Wetting-dewetting behavior is a universal phenomenon for fluids on solid surfaces,for instance,the liquid on spider silk and lotus leaves[1].Controlling the wetting-dewetting behavior of fluids in a predictable and generalizable manner is of broad interest in various applications,such as anti-corrosion,antifogging,medicine,oil-water separation,self-cleaning,and water harvesting[2].展开更多
A controlled wrinkled structure is a simple and effective approach to achieve unique properties and has been widely used in flexible materials.In this study,we reported a substrate prestrain method for fabricating wri...A controlled wrinkled structure is a simple and effective approach to achieve unique properties and has been widely used in flexible materials.In this study,we reported a substrate prestrain method for fabricating wrinkle-structured Zr52Ti34Nb14 multiplebasis-element(MBE)alloy films as biocompatible materials.Variations in the film thickness and substrate prestraining enabled a precise control of the amplitude and wavelength of the wrinkled structures,ranging from micrometers to nanometers.Moreover,owing to the flexibility of the wrinkled structures,the wrinkle-structure pattern could be adjusted by simply relaxing or further stretching of the substrate,leading to dynamically tunable transmittance and wetting behaviors.This result not only reveals Zr52Ti34Nb14 MBE alloy films as a potential flexible material,but also provides a new structural design approach for other MBE alloy systems.展开更多
基金supported by the Postdoctor Project of Hubei Province(2024HBBHCXA074)National Natural Science Foundation of China(51974212)+2 种基金China Baowu Low Carbon Metallurgy Innovation Foundation(BWLCF202116)Foundation of Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking(NPISlab25-03)Science and Technology Major Project of Wuhan(2023020302020572).
文摘The wetting behavior of slag–coke is a crucial factor influencing the permeability of the lower part of the blast furnace.However,a systematic understanding of the wetting behavior and underlying mechanisms between titanium-containing slag and tuyere coke remains lacking.The sessile drop method was employed to explore the effects of temperature,binary basicity,FeO,and TiO_(2) contents on the wetting behavior of titanium-containing slag and tuyere coke.The results indicate that increasing the temperature enhances the adhesion and wettability of the droplet,reducing the contact angle.Meanwhile,it accelerates the chemical reactions between slag and coke,leading to faster equilibrium.Conversely,increasing slag basicity elevates the contact angle by inhibiting chemical reactions at the slag–coke interface.This inhibition reduces both contact area and depth,thereby hindering slag droplet spreading on the coke surface.The contact angle decreases as the FeO content in the slag increases.Notably,the increase in TiO_(2) content has a dual effect on slag–coke wettability.Initially,it promotes wetting by reducing surface tension and lowering the contact angle.While the TiO_(2) content exceeds 20 wt.%,Ti(C,N)forms a barrier layer at the slag–coke interface,hindering the contact between slag and coke and resulting in an increased contact angle.
基金supported by the National Natural Science Foundation of China(Grant No.11374243)
文摘Based on the fact that rubbed groove patterns also affect the anchoring of liquid crystals at substrates,a quartic coupling is included in constructing the surface energy for a liquid crystal cell.The phase diagram and the wetting behaviors of the liquid crystal cell,bounded by surfactant-laden interfaces in a magnetic field perpendicular to the substrate are discussed by taking the quartic coupling into account.The nematic order increases at the surface while it decreases in the bulk as a result of the introduction of quartic substrate-liquid crystal coupling,indicating that the groove anchoring makes the liquid crystal molecules align more orderly near the substrate than away from it.This causes a different wetting behavior：complete wetting.
文摘The effects of the substrate-water interaction on the wetting behavior in water-oil and surfactant-water-oil systems confined by one substrate which has the preferential interaction to one species of particles have been investigated by using the free energy analysis and discontinuous molecular dynamic simulations. As the preferential interaction between the substrate and water particles varies from small repulsion to large attraction, the partial drying, partial wetting and complete wetting state are observed in sequence. In addition, the wetting behavior of surfactant aqueous solution on the substrate is not only dependent on the interaction, but also limited by the maximum equilibrium concentration of surfactants at the interface.
基金financially supported by the National Natural Science Foundation of China(Grant Nos.U21A2057 and U1908223)the open research fund for the State Key Laboratory of Advanced Refractories(Grant No.SKLAR202405).
文摘Alkaline slag is vital in rare earth steel refining,making it crucial to study the wetting and penetration mechanisms between refractory materials and slag.The effect of Eu_(2)O_(3) doping on the sintering properties of MgO-MgAl_(2)O_(4) refractory materials was investigated while simulating the wetting behavior between the refractory and the CaO-Al_(2)O_(3)-SiO_(2)-MgO quaternary alkaline slag during rare earth steel smelting to improve the material’s resistance to alkaline slag corrosion.The doping of Eu_(2)O_(3) can alter the crystal structure parameters of MgAl_(2)O_(4) and MgO,causing lattice distortion.This lattice activation promotes interionic mass and diffusion,helping reduce porosity and promote densification of the material,further improving sintering properties.At the equilibrium wetting temperature(1723 K),Eu_(2)O_(3) doping increases the interfacial free energy between the slag and refractory material,reducing the spreading coefficient of the molten slag.The contact angle increases from 32.1°to 42.2°,and the residual slag volume increases from 17.9%to 23.5%.The results of thermodynamic analysis show that MgAl_(2)O_(4) and EuAlO3 formed at the interface block the penetration of molten slag at high temperatures,improving the resistance of MgO-MgAl_(2)O_(4) refractories to alkaline slag corrosion.Based on the capillary theory model,it was calculated that the capillary tension of the slag gradually increases with the addition of Eu_(2)O_(3),while the theoretical penetration depth of the slag gradually decreases.The experimental results showed that the slag erosion depth of the sample decreased from 102.54 to 68.28μm.
基金financially supported by the National Natural Science Foundation of China(Nos.51173181 and 51373166)“The Hundred Talents Program”from the Chinese Academy of Sciences and the International S&T Cooperation Program from Department of Science and Technology of Jilin Province(No.20160414032GH)
文摘Block copolymer lithography is emerging as one of the leading technologies for patteming nanoscale dense features. In almost all potential applications of this technology, control over the orientation of cylindrical and lamellar domains is required for pattern transfer from the block copolymer film. This review highlights the state-of-art development of brushes to modify the substrates to control the assembly behaviors of block copolymers in films. Selected important contributions to the development of self-assembled monolayers, polymer brushes and mats, and chemically patterned brushes are discussed.
基金financially supported by the Nature Science Foun-dations of China(NSFC)(Nos.52401071 andU21B2052)China National Postdoctoral Program for Innovative Talents(No.BX20240459).
文摘Volcanic ashes are posing increasingly severer threats to the aviation safety.As the operation temperature of the turbine engine elevates,molten volcanic ash leads to the degradation of the thermal barrier coatings(TBCs)and eventually catastrophic engine failure.However,the physical and chemical properties of volcanic ashes vary due to the distinct chemical compositions,rendering it extremely challenging to evaluate the effects of each ash material on the failure of TBC.Here,we proposed a new metric termed Basicity to investigate the influence of chemical composition on the melting temperature and viscosity of volcanic ashes.Artificial CaO-MgO-Al_(2)O_(3)-SiO_(2) materials(CMAS)were synthesized to simulate the wetting,spreading and corrosion behavior of volcanic ashes at 1300 ℃ on(Gd_(0.9)Yb_(0.1))2Zr_(2)O_(7)(GYbZ),a model TBC material.Our results reveal that the synthetic CMAS does not fully capture the damage caused by volcanic ash due to the difference in compositions.The viscosity and characteristic temperatures decrease as the Basicity value increases,indicating its significant impact on the fusion properties of ashes.Notably,distinct from CMAS,the unexpected presence of Fe_(2)O_(3) in volcanic ashes promotes the formation of garnet phase,conversely impedes the formation of apatite dense layer.These findings provide valuable insights into the corrosion mechanisms caused by TBC and strategies for TBC protection against volcanic ashes.
文摘Wetting-dewetting behavior is a universal phenomenon for fluids on solid surfaces,for instance,the liquid on spider silk and lotus leaves[1].Controlling the wetting-dewetting behavior of fluids in a predictable and generalizable manner is of broad interest in various applications,such as anti-corrosion,antifogging,medicine,oil-water separation,self-cleaning,and water harvesting[2].
基金supported by financial support from the Guangdong Basic and Applied Basic Research Foundation(No.2019B1515120020).
文摘A controlled wrinkled structure is a simple and effective approach to achieve unique properties and has been widely used in flexible materials.In this study,we reported a substrate prestrain method for fabricating wrinkle-structured Zr52Ti34Nb14 multiplebasis-element(MBE)alloy films as biocompatible materials.Variations in the film thickness and substrate prestraining enabled a precise control of the amplitude and wavelength of the wrinkled structures,ranging from micrometers to nanometers.Moreover,owing to the flexibility of the wrinkled structures,the wrinkle-structure pattern could be adjusted by simply relaxing or further stretching of the substrate,leading to dynamically tunable transmittance and wetting behaviors.This result not only reveals Zr52Ti34Nb14 MBE alloy films as a potential flexible material,but also provides a new structural design approach for other MBE alloy systems.
