Metal-insulator-metal(MIM)cavity as a lithography-free structure to control light transmission and reflection has great potential in the field of optical sensing.However,the dense top metal layer of the MIM prohibits ...Metal-insulator-metal(MIM)cavity as a lithography-free structure to control light transmission and reflection has great potential in the field of optical sensing.However,the dense top metal layer of the MIM prohibits any external medium from entering the dielectric insulation layer,which limits the application of the cavity in the sensing field.Herein,we demonstrate a series of monolithic metal-organic frameworks(MOFs)based MIM cavities,which are treated by plasma etching to provide channels for chemical diffusion and to advance sensing.We modulate the bandwidth of the MIM filters by controlling the MOF thickness as insulator layers.Oxygen plasma-etching is applied to build channels on the top metal layer without altering their saturation and brightness for chemical sensing performance.The etching time regulates the number and size of channels on the top metal layer.Sensing behavior is demonstrated on the plasma-etched MOFs-based MIM cavity when external chemicals diffuse in the cavity.In addition,we generate patterned structure of the MOFs-based MIM cavity via plasma-mask method,which can transfer to different substrates and produce a controllable structure color change for chemical sensing.Our MIM cavity may promote the advancement and applications of structural color in security imaging,color display,information anticounterfeiting,and color printing.展开更多
Surface wettability plays a significant role in reducing solid–liquid frictional resistance,especially the superhydrophilic/hydrophilic interface because of its excellent thermodynamic stability.In this work,poly(acr...Surface wettability plays a significant role in reducing solid–liquid frictional resistance,especially the superhydrophilic/hydrophilic interface because of its excellent thermodynamic stability.In this work,poly(acrylic acid)-poly(acrylamide)(PAA–PAM)hydrogel coatings with different thicknesses were prepared in situ by polydopamine(PDA)-UV assisted surface catalytically initiated radical polymerization.Fluid drag reduction performance of hydrogel surface was measured using a rotational rheometer by the plate–plate mode.The experimental results showed that the average drag reduction of hydrogel surface could reach up to about 56%in Couette flow,which was mainly due to the interfacial polymerization phenomenon that enhanced the ability of hydration layer to delay the momentum dissipation between fluid layers and the diffusion behavior of surface.The proposed drag reduction mechanism of hydrogel surface was expected to shed new light on hydrogel–liquid interface interaction and provide a new way for the development of steady-state drag reduction methods.展开更多
Hydrogels have been considered as potential candidates for cartilage replacement due to their high‐water content,extreme network hydration,excellent biocompatibility and tunable mechanical properties.Currently,the de...Hydrogels have been considered as potential candidates for cartilage replacement due to their high‐water content,extreme network hydration,excellent biocompatibility and tunable mechanical properties.Currently,the development of high‐performance cartilageinspired hydrogel lubrication materials has become a hot topic in the field of biomedical materials.This review focusses on the recent development of cartilage‐inspired highstrength hydrogels from the viewpoints of bionic surface/interface and biotribology.Specifically,the composition structure and extraordinary lubrication mechanism of the natural articular cartilage are overviewed first.Subsequently,some of the novel biomimetic design strategies for preparing high strength cartilage hydrogels with various network structures are summarised in detail,while systematic evaluation of lubrication properties and mechanisms are discussed.Furthermore,new surface modification means for improving the lubrication feature of high strength cartilage hydrogel materials are presented.In addition,in order to demonstrate the application potential of cartilage hydrogels in clinical,several bonding methods to decorate hydrogels onto surfaces of natural bone tissues or artificial joint materials are introduced.Finally,current challenges and future research directions are discussed for cartilage‐inspired hydrogel lubrication materials.展开更多
At present,more and more diseases are associated with the lubrication dysfunction,which requires a systematic study of the complex lubrication behavior of tissues and organs in human body.Natural biomacromolecular lub...At present,more and more diseases are associated with the lubrication dysfunction,which requires a systematic study of the complex lubrication behavior of tissues and organs in human body.Natural biomacromolecular lubricants are essential for maintaining ultra-low coefficients of friction between sliding biological interfaces.However,when the surface lubrication performance of tissues or organs destroys heavily,it will bring friction/shear damage for sliding contact interfaces.Therefore,the application of exogenous biological lubricating materials to improve the lubrication situation of damaged tissue or organ interfaces has attracted extensive attention of researchers.In this review,based on a simple summary of lubrication mechanism at sliding biological interface,we systematically introduce the research progress of several kinds of representatively biolubrication materials,including eye drops,tissue anti-adhesion agents,joint lubricants,and medical device lubricants.Meanwhile,the lubrication mechanism and individual advantage and shortcoming for each of these synthetic exogenous lubricated materials are clarified.Correspondingly,the important lubrication application functionality of these biolubricant materials in typically medical surgery scenes,such as dry eye syndrome,tissue adhesion,arthritis,and interventional medical devices,is discussed.Finally,we look forward to the future development direction of artificial biolubricant materials.展开更多
A new type of lubricating material(BTA-P_(4444)-Lig)was synthesized by combining lignin with tetrabutylphosphorus and benzotriazole.The tribological properties,corrosion resistance,and anti-oxidation properties of BTA...A new type of lubricating material(BTA-P_(4444)-Lig)was synthesized by combining lignin with tetrabutylphosphorus and benzotriazole.The tribological properties,corrosion resistance,and anti-oxidation properties of BTA-P_(4444)-Lig as a lubricant were investigated.The lubricating material exhibits excellent friction reduction and wear resistance,as well as good thermal stability and excellent oxidation resistance.Mechanistic analysis reveals that the active elements N and P in the lubricating material react with the metal substrate,and the reaction film effectively blocks direct contact between the friction pairs,affording excellent friction reduction and wear resistance.At the same time,the phenolic hydroxyl group in lignin reacts with oxygen free radicals to form a resonance-stable semi-quinone free radical,which interrupts the chain reaction and affords good anti-oxidant activity.展开更多
Despite extensive efforts in designing and preparing switchable underwater adhesives,it is not easy to regulate the underwater adhesion strength locally and remotely.Here,we design and synthesize photoreversible copol...Despite extensive efforts in designing and preparing switchable underwater adhesives,it is not easy to regulate the underwater adhesion strength locally and remotely.Here,we design and synthesize photoreversible copolymer of poly[dopamine methacrylamide-co-methoxyethyl-acrylate-co-7-(2-methacryloyloxyethoxy)-4-methylcoumarin].Due to the dynamic formation and breaking of chemical crosslinking networks within the smart adhesives,the material shows widely tunable adhesion strength from∼150 to∼450 kPa and long-range reversible maneuverability under orthogonal 254 and 365 nm ultraviolet light stimulation via the coumarin dimerization and cycloreversion.Moreover,the adhesive exhibits good circulation performance and stability in an acid–base environment.It also demonstrated that the bolt can be coated with the smart adhesive material for on-demand bonding.This design principle opens the door to the development of remotely controllable high-performance smart underwater adhesives.展开更多
基金support from the National Natural Science Foundations of China(No.52071270)the Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing(Yantai)(No.AMGM2023F03)+1 种基金Guangdong Basic and Applied Basic Research Foundation(No.2021A1515410006)the Research Fund of the State Key Laboratory of Solidification Processing(NPU)(No.2022-QZ-04).
文摘Metal-insulator-metal(MIM)cavity as a lithography-free structure to control light transmission and reflection has great potential in the field of optical sensing.However,the dense top metal layer of the MIM prohibits any external medium from entering the dielectric insulation layer,which limits the application of the cavity in the sensing field.Herein,we demonstrate a series of monolithic metal-organic frameworks(MOFs)based MIM cavities,which are treated by plasma etching to provide channels for chemical diffusion and to advance sensing.We modulate the bandwidth of the MIM filters by controlling the MOF thickness as insulator layers.Oxygen plasma-etching is applied to build channels on the top metal layer without altering their saturation and brightness for chemical sensing performance.The etching time regulates the number and size of channels on the top metal layer.Sensing behavior is demonstrated on the plasma-etched MOFs-based MIM cavity when external chemicals diffuse in the cavity.In addition,we generate patterned structure of the MOFs-based MIM cavity via plasma-mask method,which can transfer to different substrates and produce a controllable structure color change for chemical sensing.Our MIM cavity may promote the advancement and applications of structural color in security imaging,color display,information anticounterfeiting,and color printing.
基金financially supported by National Natural Science Foundation of China(51905519,22032006,U2030201,and U21A2046).
文摘Surface wettability plays a significant role in reducing solid–liquid frictional resistance,especially the superhydrophilic/hydrophilic interface because of its excellent thermodynamic stability.In this work,poly(acrylic acid)-poly(acrylamide)(PAA–PAM)hydrogel coatings with different thicknesses were prepared in situ by polydopamine(PDA)-UV assisted surface catalytically initiated radical polymerization.Fluid drag reduction performance of hydrogel surface was measured using a rotational rheometer by the plate–plate mode.The experimental results showed that the average drag reduction of hydrogel surface could reach up to about 56%in Couette flow,which was mainly due to the interfacial polymerization phenomenon that enhanced the ability of hydration layer to delay the momentum dissipation between fluid layers and the diffusion behavior of surface.The proposed drag reduction mechanism of hydrogel surface was expected to shed new light on hydrogel–liquid interface interaction and provide a new way for the development of steady-state drag reduction methods.
基金National Natural Science Foundation of China,Grant/Award Numbers:22032006,52075522,52105222Outstanding Youth Fund of Gansu Province,Grant/Award Number:21JR7RA095Key Research Project of Shandong Provincial Natural Science Foundation,Grant/Award Number:ZR2021ZD27。
文摘Hydrogels have been considered as potential candidates for cartilage replacement due to their high‐water content,extreme network hydration,excellent biocompatibility and tunable mechanical properties.Currently,the development of high‐performance cartilageinspired hydrogel lubrication materials has become a hot topic in the field of biomedical materials.This review focusses on the recent development of cartilage‐inspired highstrength hydrogels from the viewpoints of bionic surface/interface and biotribology.Specifically,the composition structure and extraordinary lubrication mechanism of the natural articular cartilage are overviewed first.Subsequently,some of the novel biomimetic design strategies for preparing high strength cartilage hydrogels with various network structures are summarised in detail,while systematic evaluation of lubrication properties and mechanisms are discussed.Furthermore,new surface modification means for improving the lubrication feature of high strength cartilage hydrogel materials are presented.In addition,in order to demonstrate the application potential of cartilage hydrogels in clinical,several bonding methods to decorate hydrogels onto surfaces of natural bone tissues or artificial joint materials are introduced.Finally,current challenges and future research directions are discussed for cartilage‐inspired hydrogel lubrication materials.
基金We are grateful for the financial support from the National Natural Science Foundation of China(22032006 and 52075522)Key Research Project of Shandong Provincial Natural Science Foundation(ZR2021ZD27)+1 种基金Outstanding Youth Fund of Gansu Province(21JR7RA095)LICP Cooperation Foundation for Young Scholars(HZJ21-04).
文摘At present,more and more diseases are associated with the lubrication dysfunction,which requires a systematic study of the complex lubrication behavior of tissues and organs in human body.Natural biomacromolecular lubricants are essential for maintaining ultra-low coefficients of friction between sliding biological interfaces.However,when the surface lubrication performance of tissues or organs destroys heavily,it will bring friction/shear damage for sliding contact interfaces.Therefore,the application of exogenous biological lubricating materials to improve the lubrication situation of damaged tissue or organ interfaces has attracted extensive attention of researchers.In this review,based on a simple summary of lubrication mechanism at sliding biological interface,we systematically introduce the research progress of several kinds of representatively biolubrication materials,including eye drops,tissue anti-adhesion agents,joint lubricants,and medical device lubricants.Meanwhile,the lubrication mechanism and individual advantage and shortcoming for each of these synthetic exogenous lubricated materials are clarified.Correspondingly,the important lubrication application functionality of these biolubricant materials in typically medical surgery scenes,such as dry eye syndrome,tissue adhesion,arthritis,and interventional medical devices,is discussed.Finally,we look forward to the future development direction of artificial biolubricant materials.
基金financial support from the National Key R&D Program of China(2021YFA0716304)the National Natural Science Foundation of China(52075524,21972153,and U21A20280)+2 种基金the Youth Innovation Promotion Association of CAS(2022429 and 2018454)Gansu Province Science and Technology Plan(20JR10RA060 and 20JR10RA048)LICP Cooperation Foundation for Young Scholars(HZJJ21-06).
文摘A new type of lubricating material(BTA-P_(4444)-Lig)was synthesized by combining lignin with tetrabutylphosphorus and benzotriazole.The tribological properties,corrosion resistance,and anti-oxidation properties of BTA-P_(4444)-Lig as a lubricant were investigated.The lubricating material exhibits excellent friction reduction and wear resistance,as well as good thermal stability and excellent oxidation resistance.Mechanistic analysis reveals that the active elements N and P in the lubricating material react with the metal substrate,and the reaction film effectively blocks direct contact between the friction pairs,affording excellent friction reduction and wear resistance.At the same time,the phenolic hydroxyl group in lignin reacts with oxygen free radicals to form a resonance-stable semi-quinone free radical,which interrupts the chain reaction and affords good anti-oxidant activity.
基金support from the National Natural Science Foundation of China (Nos.22102201,22032006,52205232,and 22072169)the National Key Research and Development Program of China (No.2021YFA0716304)+3 种基金NSAF (No.U2030201)Gansu Province Basic Research Innovation Group Project (No.22JR5RA093)Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing (No.AMGM0717)the Special Research Assistant Project of the Chinese Academy of Sciences.
文摘Despite extensive efforts in designing and preparing switchable underwater adhesives,it is not easy to regulate the underwater adhesion strength locally and remotely.Here,we design and synthesize photoreversible copolymer of poly[dopamine methacrylamide-co-methoxyethyl-acrylate-co-7-(2-methacryloyloxyethoxy)-4-methylcoumarin].Due to the dynamic formation and breaking of chemical crosslinking networks within the smart adhesives,the material shows widely tunable adhesion strength from∼150 to∼450 kPa and long-range reversible maneuverability under orthogonal 254 and 365 nm ultraviolet light stimulation via the coumarin dimerization and cycloreversion.Moreover,the adhesive exhibits good circulation performance and stability in an acid–base environment.It also demonstrated that the bolt can be coated with the smart adhesive material for on-demand bonding.This design principle opens the door to the development of remotely controllable high-performance smart underwater adhesives.
