With the continuously increasing awareness of energy conservation and the intensifying impacts of global warming, Personal Thermal Management (PTM) technologies are increasingly recognized for their potential to ensur...With the continuously increasing awareness of energy conservation and the intensifying impacts of global warming, Personal Thermal Management (PTM) technologies are increasingly recognized for their potential to ensure human thermal comfort in extreme environments. Biomimetic structures have emerged as a novel source of inspiration for PTM applications. This review systematically summarizes the biomimetic structures, phase change materials, manufacturing methods, and the performance of multifunctional PTM wearables. Firstly, it analyzes the biomimetic structures with thermal regulation and encapsulated phase change material functionalities from different dimensions, highlighting their applications in PTM. Subsequently, it outlines the conventional manufacturing methods incorporating various biomimetic structures, offering strategies for the production of PTM wearables. The review also discusses the typical performance characteristics of multifunctional PTM wearables, addressing the current demands in thermal management. Finally, opportunities and challenges in PTM field are proposed, proposing new directions for future research.展开更多
Nowadays,the utilization rate of electronic products is increasing while showing no obvious sign of reaching a limit.To solve the associated“internal heat generation problem”,scientists have proposed two methods or ...Nowadays,the utilization rate of electronic products is increasing while showing no obvious sign of reaching a limit.To solve the associated“internal heat generation problem”,scientists have proposed two methods or strategies.The first approach consists of replacing the heat exchange medium with a nanofluid.However,the high surface energy of the nanoparticles makes them prone to accumulate along the heat transfer surface.The second method follows a different approach.It tries to modify the surface structure of the electronic components in order to reduce the fluid-dynamic drag and improve the rate of heat exchange.This article reviews these effects considering different types of nanofluid and different shapes,sizes,and arrangements of“biomimetic grooves”.The idea to use these two methods in a combined fashion(to improve heat transfer and reduce flow resistance at the same time)is also developed and discussed critically to a certain extent.展开更多
Plasma spray physical vapor deposition(PS-PVD)(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)(GYbZ)thermal barrier coatings(TBCs)exhibited better silicate-phobicity than coatings produced by electron beam physical vapor depo-sition...Plasma spray physical vapor deposition(PS-PVD)(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)(GYbZ)thermal barrier coatings(TBCs)exhibited better silicate-phobicity than coatings produced by electron beam physical vapor depo-sition.In combination with PS-PVD and ultrafast laser direct writing technology,biomimetic structured GYbZ TBCs,with a triple-scale micro/nano surface microstructure,were obtained.Laser ablating on the PS-PVD GYbZ coating enhanced the surface roughness,improving its wear resistance without increasing the surface hardness.Furthermore,during the laser ablation processing,numerous nanoparticles were deposited in-situ in the gaps between columns of the coating,reducing the coating Young’s modulus.The simulated temperature field and heat flux field demonstrated that the presence of numerous interfaces between small columns of the PS-PVD coatings is beneficial to thermal insulation.However,laser ablation decreased the coating thickness,reducing the thermal insulation by around 20%-30%as compared to its PS-PVD counterpart,suggesting that a moderate increase in the coating thickness should be considered when designing an efficient TBC system.展开更多
The application of conventional manganese dioxide(MnO_(2))materials in sodium-ion supercapacitors(Na-SCs)is considerably limited by their low conductivity and structural instability.Biomimetic morphology engineering c...The application of conventional manganese dioxide(MnO_(2))materials in sodium-ion supercapacitors(Na-SCs)is considerably limited by their low conductivity and structural instability.Biomimetic morphology engineering can optimize the electrochemical performance of MnO_(2).Here,based on the metal-organic frameworks(MOFs)-derived method and electrochemical reconstruction,a coral-like MnO_(2)structure integrated with a functional nitrogen-doped carbon(NC)coating is designed for Na-SC application.The bioinspired coral-like structure captures numerous electrolyte ions and increases the Na+concentration on the electrode surface,which is beneficial for optimizing the Na+transport pathway and accelerating the electrode reaction kinetics.Moreover,the coral-like crosslinked structure effectively enhances the mechanical properties,enabling the maintenance of the structure of MnO_(2)-based electrodes during long-term operation.Furthermore,in/ex-situ characterizations are performed to elucidate the mechanism of lattice transformation during electrochemical phase reconstruction.Additionally,the theoretical calculation and simulation results reveal the ion/electron dynamics in the fabricated electrode.The prepared electrode demonstrates excellent capacitance storage ability(340.7 F g^(−1)at 0.5 A g^(−1))and cycling stability(85.1%capacitance retention after 10,000 cycles).The assembled hybrid device exhibits exceptional life-span(82.0%capacitance retention after 10,000 cycles)and exceptional energy density(36.5 Wh kg^(−1)).This study provides a reliable biomimetic morphology design strategy for MnO_(2)cathodes,paving the way for the fabrication of high-performance Na-SCs.展开更多
Lithium metal anode is one of the ideal anode materials for the next generation of high-energy-density battery systems.Unfortunately,the uneven nucleation of Li leads to dendrite growth and volume changes during cycli...Lithium metal anode is one of the ideal anode materials for the next generation of high-energy-density battery systems.Unfortunately,the uneven nucleation of Li leads to dendrite growth and volume changes during cycling,resulting in poor electrochemical performance and potential safety hazards,which hinder its practical application.In this work,a low-cost chicken-bonederived carbon material(CBC)with a biomimetic structure was designed and synthesized using a simple one-step carbonization method.Combining theoretical calculations and experimental results,the self-doped N and S heteroatoms in CBC are demonstrated to effectively reduce the binding energy with Li atoms and lower the nucleation overpotential.After uniform nucleation,the Li metal grows in a spherical shape without dendrites,which is related to the reduction of the local current density inside the biomimetic crosslinking structure of CBC.Benefiting from this favorable Li growth behavior,the Li@CBC electrode achieves ultra-low nucleation overpotential(15.5 mV at 0.1 mA cm^(−2))and superdense lithium deposition(zero volume expansion rate at a capacity of 2 mAh cm^(−2))without introducing additional lithiophilic sites.The CBC retains a high Coulombic efficiency of over 98%in 479 cycles(1 mA cm^(−2)and 1 mAh cm^(−2))when applied in a half-cell with Li,and shows an excellent rate and cycling performance when applied in a full cell with LiFePO4 as the cathode.展开更多
Flexible piezoresistive sensors based on biomimetic microstructures are prospective for broad application in motion monitoring.However,the design and preparation processes of most biomimetic microstructures in the exi...Flexible piezoresistive sensors based on biomimetic microstructures are prospective for broad application in motion monitoring.However,the design and preparation processes of most biomimetic microstructures in the existing studies are complicated,and there are few studies on pore size control.Herein,the porous structure of human bones was used as a biomimetic prototype,and optimally designed by creating a theoretical equivalent sensor model and a finite element model.Soluble raw materials such as sugar and salt in different particle sizes were pressed into porous templates.Based on the template method,porous structures in different pore sizes were prepared using polydimethylsiloxane(PDMS)polymer as the substrate.On this basis,graphene oxide conductive coating was prepared with the modified Hummers method and then deposited via dip coating onto the substrate.Finally,a PDMS-based porous structure biomimetic flexible piezoresistive sensor was developed.Mechanically,the deformation of the sensor under the same load increased with the pore size rising from 0.3 to 1.5 mm.Electrically,the resistance rang of the sensor was enlarged as the pore size rose.The resistance variation rates of samples with pore sizes of 0.3,1.0,and 1.5 mm at approximately the 200th cycle were 63%,79%,and 81%,respectively;at the 500th cycle,these values were 63%,77%,and 79%;and at the 1000th cycle,they stabilized at 63%,74%,and 76%.These results indicate that the fabricated sensor exhibits high stability and fatigue resistance.At the pressure of 0–25 kPa,the sensitivity rose from 0.0688 to 0.1260 kPa−1,and the performance was enhanced by 83%.After 1,000 cycles of compression testing,the signal output was stable,and no damage was caused to the substrate.Further application tests showed the biomimetic sensor accurately and effectively identified human joint motions and gestures,and has potential application value in human motion monitoring.展开更多
The lightweight design of hydraulic quadruped robots,especially the lightweight design of the leg joint Hydraulic Drive Unit(HDU),can improve the robot's response speed,motion speed,endurance,and load capacity.How...The lightweight design of hydraulic quadruped robots,especially the lightweight design of the leg joint Hydraulic Drive Unit(HDU),can improve the robot's response speed,motion speed,endurance,and load capacity.However,the lightweight design of HDU is a huge challenge due to the need for structural strength.This paper is inspired by the geometric shape of fish bones and biomimetic reinforcing ribs on the surface of the HDU shell are designed to increase its strength and reduce its weight.First,a HDU shell with biomimetic fish bone reinforcing ribs structure is proposed.Then,the MATLAB toolbox and ANSYS finite element analysis module are used to optimize the parameters of the biomimetic reinforcing ribs structure and the overall layout of the shell.Finally,the HDU shell is manufactured using additive manufacturing technology,and a performance testing platform is built to conduct dynamic and static performance tests on the designed HDU.The experimental results show that the HDU with biomimetic fish bone reinforcing ribs has excellent dynamic performance and better static performance than the prototype model,and the weight of the shell is reduced by 20%compared to the prototype model.This work has broad application prospects in the lightweight and high-strength design of closed-pressure vessel components.展开更多
Simulating the structures and behaviors of living organisms are of great significance to develop novel multi-functional intelligent devices. However, the development of biomimetic devices with complex deformable struc...Simulating the structures and behaviors of living organisms are of great significance to develop novel multi-functional intelligent devices. However, the development of biomimetic devices with complex deformable structures and synergistic properties is still on the way. Herein, we propose a simple and effective approach to create the multi-functional stimuli-responsive biomimetic devices with independently pre-programmable colorful visual patterns, complex geometries and morphable modes. The metal organic framework(MOF)-based composite film acts as a rigidity actuation substrate to support and mechanically guide the spatial configuration of the soft chiral nematic liquid crystal elastomer(CLCE) sheet. We can directly program the structural color of the CLCE sheet by adjusting the thickness distribution without tedious chemical modification. By using this coordination strategy, we fabricate an artificial flower, which exhibits a synergistic effect of both shape transformation and color change like paeonia ‘Coral Sunset’at different flowering stages, and can even perform different flowering behaviors by bending, twisting and curling petals. The assembled bionic flower is innovatively demonstrated to respond to local stimuli of humidity, heat or ultraviolet irradiation. Therefore, the spatial assembly of CLCE combined with functional MOF materials has a wide range of potential application in multi-functional integrated artificial systems.展开更多
Inspired by nature,the design and synthesis of novel biomimetic materials are gradually attracting the attention of scientists.Biomimetic materials with excellent performance are widely applied in medical health,indus...Inspired by nature,the design and synthesis of novel biomimetic materials are gradually attracting the attention of scientists.Biomimetic materials with excellent performance are widely applied in medical health,industrial production,agricultural planting,aerospace,etc.As a natural porous biomass material,diatomite has the advantages of high porosity,low bulk density,stable chemical property and large surface area.Benefiting from these advantages,it is of great importance to treat diatomite as bionic substrate to synthesize diatomite biomimetic materials,which can be endowed good structure stability and natural mechanical property.It is an ideal option for crystal growth and uniform dispersion of nanostructures,to improve the agglomeration and high cost of nanomaterials.This review briefly introduces our recent achievements on diatomite biomimetic materials in different application fields.In view of its excellent optical,thermal,chemical and mechanical property,diatomite biomimetic materials have shown extensive application potential in various fields of science and engineering,which include catalysis,corrosion protection,microwave adsorption,super-hydrophobicity,pollutant adsorption,energy storage,etc.It demonstrates that diatomite biomimetic materials with different functional properties can be synthesized by diverse chemical means and preparation methods for different application.By composed of inorganic nanomaterial hybrid,this diatomite biomimetic materials display a three-dimensional network structure with diatomite morphology.The design and synthesis of diatomite biomimetic materials provide more potential bionic categories for different applications,which can accelerate the development of low-cost and high-performance biomimetic materials.展开更多
Using chitin as the templating material,we obtained layered nanocomposites like shrimp or crab shells via a sol-gel self-assembly process.SEM images show a layered structure and XRD patterns present a typical peak of ...Using chitin as the templating material,we obtained layered nanocomposites like shrimp or crab shells via a sol-gel self-assembly process.SEM images show a layered structure and XRD patterns present a typical peak of chitin,which indicates the templating role of chitin in the as-received hybrid samples.Additionally,the layer spacing of chitin/silica hybrid materials is reduced with increasing content of silica.After the heat treatment for carbonization,layered SiOC nanocomposites with mesoporous structures were obtained and showed good dye adsorption performance.The present study demonstrates a reliable and self-assembly synthesis technique for the development of advanced high-performance nanocomposites with biomimetic nanostructures.展开更多
Ultra-thin electromagnetic wave(EMW)absorbers present challenging demands on EMW absorption performance.Drawing inspiration from heather leaf structures,this study introduces an innovative design strategy for EMW abso...Ultra-thin electromagnetic wave(EMW)absorbers present challenging demands on EMW absorption performance.Drawing inspiration from heather leaf structures,this study introduces an innovative design strategy for EMW absorbing material,proposing biomimetic leaf SnO_(2) structures(bio-SnO_(2))on carbon fabric(CF).By employing leaf-shaped SnS2 as precursors,biomimetic leaf SnO_(2) nanostructures are constructed on CF surface after a simple thermal treatment,resulting in bio-SnO_(2)@CF composite.Experimental results indicate that bio-SnO_(2)@CF exhibits an exceptional minimum reflection loss of-54.8 dB at an incredibly thin thickness of 1.2 mm.Radar cross section(RCS)simulations further validate the outstanding EMW attenuation ability of bio-SnO_(2)@CF,attaining a maximum RCS reduction value of 16.9 dBm^(2) at an incident wave angle ofθ=0°.This novel research showcases the biomimetic structural design strategy and its remarkable function in enhancing the EMW absorbing performance at ultra-thin absorber thickness.展开更多
Lung diseases associated with alveoli,such as acute respiratory distress syndrome,have posed a long-term threat to human health.However,an in vitro model capable of simulating different deformations of the alveoli and...Lung diseases associated with alveoli,such as acute respiratory distress syndrome,have posed a long-term threat to human health.However,an in vitro model capable of simulating different deformations of the alveoli and a suitable material for mimicking basement membrane are currently lacking.Here,we present an innovative biomimetic controllable strain membrane(BCSM)at an air–liquid interface(ALI)to reconstruct alveolar respiration.The BCSM consists of a high-precision three-dimensional printing melt-electrowritten polycaprolactone(PCL)mesh,coated with a hydrogel substrate—to simulate the important functions(such as stiffness,porosity,wettability,and ALI)of alveolar microenvironments,and seeded pulmonary epithelial cells and vascular endothelial cells on either side,respectively.Inspired by papercutting,the BCSM was fabricated in the plane while it operated in three dimensions.A series of the topological structure of the BCSM was designed to control various local-area strain,mimicking alveolar varied deformation.Lopinavir/ritonavir could reduce Lamin A expression under over-stretch condition,which might be effective in preventing ventilator-induced lung injury.The biomimetic lung-unit model with BCSM has broader application prospects in alveoli-related research in the future,such as in drug toxicology and metabolism.展开更多
The construction and regeneration of tissue-engineered auricles are pacesetters in tissue engineering and have realized their first international clinical application.However,the unstable regeneration quality and insu...The construction and regeneration of tissue-engineered auricles are pacesetters in tissue engineering and have realized their first international clinical application.However,the unstable regeneration quality and insufficient mechanical strength have become significant obstacles impeding its clinical promotion.The perichondrium is indispensable for the nutritional and vascular supply of the underlying cartilage tissue,as well as for proper anatomical functioning and mechanical performance.This study presents a novel strategy for integrated con-struction of bioengineered perichondrium with bioprinted cartilage to enhance the regeneration quality and mechanical properties of tissue-engineered auricles.Simulating the anatomical structure of the native auricle designs a sandwich construction model containing bilateral perichondrium and intermediate cartilage,employing a photocrosslinkable acellular cartilage matrix and gelatin bionics matrix microenvironment,applying co-cultured auricular chondrocytes and adipose-derived stem cells creates functional cell populations,designing hatch patterns imitates microscopic arrangement structures,utilizing sacrificial materials forms interlaminar network traffic to enhance the tight connection between layers,and finally,assessing the regen-erative quality of the constructs explores their feasibility and stability.The multi-level and multi-scale bio-mimetic construction strategy overcomes the technical limitation of the integrated construction of perichondrium-wrapped auricles and realizes biomimicry in morphology,structure,and biomechanics.Alto-gether,this study provides a technical reference for the hierarchical construction of complex tissues and pro-motes the clinical translation and application of engineered tissues or organs.展开更多
Chitin hydrogel has been recognized as a promising material for various biomedical applications because of its biocompatibility and biodegradability.However,the fabrication of strong chitin hydrogel remains a big chal...Chitin hydrogel has been recognized as a promising material for various biomedical applications because of its biocompatibility and biodegradability.However,the fabrication of strong chitin hydrogel remains a big challenge because of the insolubility of chitin in many solvents and the reduced chain length of chitin regenerated from solutions.We herein introduce the fabrication of chitin hydrogel with biomimetic structure through the chemical transformation of chitosan,which is a water-soluble deacetylated derivative of chitin.The reacetylation of the amino group in chitosan endows the obtained chitin hydrogel with outstanding resistance to swelling,degradation,extreme temperature and pH conditions,and organic solvents.The chitin hydrogel has excellent mechanical properties while retaining a high water content(more than 95 wt.%).It also shows excellent antifouling performance that it resists the adhesion of proteins,bacteria,blood,and cells.Moreover,as the initial chitosan solution can be feasibly frozen and templated by ice crystals,the chitin hydrogel structure can be either nacre-like or wood-like depending on the freezing method of the precursory chitosan solution.Owing to these anisotropic structures,such chitin hydrogel can exhibit anisotropic mechanics and mass transfer capabilities.The current work provides a rational strategy to fabricate chitin hydrogels and paves the way for its practical applications as a superior biomedical material.展开更多
The design and preparation of cost-effective and durable catalysts for electrochemical water splitting are significant for the development and application of hydrogen production.Herein,inspired by the underwater super...The design and preparation of cost-effective and durable catalysts for electrochemical water splitting are significant for the development and application of hydrogen production.Herein,inspired by the underwater superaerophobicity of fish scales,a three-dimensional multilevel nanoarray electrode with superaerophobicity was designed and fabricated by the hydrothermal method to solve the bubble shielding effect in electrochemical reactions.Benefiting from the high specific surface area,superaerophobic properties,Al doping,the Al-CoS_(2)nanosheets(NSs)/nickel foam(NF)-30 exhibits outstanding electrocatalytic activity and superior durability for electrochemical water splitting in 1 M KOH.Significantly,the Al-CoS_(2)NSs/NF-30 only required extremely low overpotential of 176 mV for oxygen evolution reaction(OER)to reach a current density of 10 mA·cm^(-2).Al-CoS_(2)NSs/NF-30 was employed as bifunctional electrode for electrochemical water splitting with a cell voltage of 1.58 V at 10 mA·cm^(-2).Meanwhile,Al-CoS_(2) NSs/NF-30 exhibited excellent durability(250 h@10 mA·cm^(-2)and 50 h@100 mA·cm^(-2)).The cobalt-based catalyst(Al-CoS_(2) NSs/NF-30)with superaerophobicity exhibits excellent performance in activity and durability,therefore is a promising electrochemical water splitting catalyst.展开更多
The frequent failures of small-diameter vascular grafts(SDVGs)mainly result from thrombosis and insufficient endothelialization.Despite recent biochemical modification strategies aiming to enhance long-term patency,th...The frequent failures of small-diameter vascular grafts(SDVGs)mainly result from thrombosis and insufficient endothelialization.Despite recent biochemical modification strategies aiming to enhance long-term patency,the challenges of suppressing thrombosis and promoting rapid endothelialization persist.We thus designed a biomimetic three-layer flexible vascular graft scaffold.This scaffold precisely replicates the nonlinear mechanical responses of vascular tissues and promotes vascular regeneration by minimizing the mechanical mismatch between the graft and the host.The biomimetic flexible SDVG scaffold comprises a screwed inner layer,a middle fabric layer,and a Polyethylene terephthalate(PET)helical coil.It shows excellent bending resistance and resilience,reducing thrombosis formation caused by impaired blood flow during bending.Moreover,this scaffold notably improves the adhesion,spreading,proliferation,and elongation of endothelial cells,facilitating luminal remodeling and maintaining long-term patency through its intimal topography.In vivo studies demonstrate that the endothelial layer forms within three months of implantation,ensuring long-term patency.By three months after implantation,both the endothelial and smooth muscle layers are regenerated,developing hierarchical microstructures and compositions similar to those of native vessels.The biomimetic flexible vascular graft with screwed structures exhibits excellent bending resistance and enhanced vascular remodeling,thereby promoting blood vessel regeneration and showing strong potential for clinical translation.展开更多
Corneal transplantation presents an urgent demand for artificial cornea stromal substitutes(ACSs)with comprehensive functional design,spanning from material biology to clinical application.Here,we report the use of an...Corneal transplantation presents an urgent demand for artificial cornea stromal substitutes(ACSs)with comprehensive functional design,spanning from material biology to clinical application.Here,we report the use of an engineering integration strategy to develop Janus ACSs with collagen-based multiscale biomimetic skel-etons and tissue-adhesion.Specifically,the electro-assembly of collagen is employed to construct the skeleton of Janus ACS that mimics the microstructure and macroscopic morphology of native corneal stroma,ensuring the desired transparency,refractive power and adaptable shape.The bi-component"bio-cement"coating on the surface of skeleton,composed of 4-arm polyethylene glycol succinyl succinate andε-polylysine,undergoes fast and mild amidation reactions driven by interfacial moisture,curing into a transparent hydrogel coating.The coating establishes a stable covalent connection between the corneal stroma and the skeleton,achieving im-mediate(<10 s)and stable tissue adhesion to adapt to the wet,dynamic mechanical environment of the eye.In vitro and in vivo studies further confirmed that the customized bio-adhesive Janus ACSs allow sutureless im-plantation and facilitate corneal epithelialization,stroma integration and reconstruction.A foraging behavior test highlighted the significant advantages of Janus ACSs in rapid vision recovery.The engineered integrated manufacturing of Janus ACSs potentially maximizes practicality while minimizing costs in applications.展开更多
This study utilized cantilever experiments to investigate the vibration properties of multibody molded beetle elytron plates(BEPs),which is a type of biomimetic sandwich plate inspired by beetle elytra;the correspondi...This study utilized cantilever experiments to investigate the vibration properties of multibody molded beetle elytron plates(BEPs),which is a type of biomimetic sandwich plate inspired by beetle elytra;the corresponding shear characteristics were further revealed by a finite element method(FEM). The following results were obtained:(1) Experimental results suggest that the maximum displacement response of the BEPs was about 25% less than that of a honeycomb plate with almost the same first natural frequency,which indicates that a BEP with reasonable structural parameters has the potential to replace a honeycomb plate to achieve better vibration performance;(2) The trabecular structure not only enhanced the shear stiffness of the core layer in column areas but also the skins in the honeycomb wall areas,thus changing the distribution of the shear force in the different components and improving the mechanical performances of the BEP;and(3) Although this enhancement effect from trabeculae was not uniform,the average shear force proportion of the skins(or core structure) in the entire BEP structure was very close to that of the honeycomb plate. Therefore,the shear calculation assumption used for honeycomb plates is still applicable in the BEP.The results provide an experimental basis for the design and application of BEPs and inspiration for the development of related products in vibrational environments.展开更多
To improve the applications of beetle elytron plates(BEPs,which are biomimetic sandwich plates inspired by beetle elytra),the flexural performance and its synergistic mechanism of multibody molded BEPs were investigat...To improve the applications of beetle elytron plates(BEPs,which are biomimetic sandwich plates inspired by beetle elytra),the flexural performance and its synergistic mechanism of multibody molded BEPs were investigated via cantilever testing and finite element method(FEM).The results are summarized as follows.(1)Although debonding damage causes failure of the multibody molded BEPs and honeycomb plate and the reasonable range of trabecular size for BEPs is narrow,both the optimal loading capacity per mass and failure deformation of the BEPs are over two times those of the honeycomb plate.(2)A flexural synergistic mechanism is revealed in the trabecular-honeycomb core structure of BEPs;this mechanism causes the maximum deformation of core structure to gradually transfer from the honeycomb wall to the trabeculae with the increase inη(the ratio of the trabecular radius to the distance between the center points of two trabeculae),which means the different stretching behaviors in these core structures.(3)Unlike the compressive mechanism of BEPs,by controlling and balancing the deformation degrees of the trabeculae and honeycomb walls,the flexural mechanism achieves a minimum core deformation and an optimal flexural performance.These results suggest a qualitative relationship between the deformation behavior of trabecular-honeycomb core structure and bending performance of the whole BEP,and provide a solid foundation for subsequent research and the considerable application potential of this biomimetic sandwich structure in many fields.展开更多
The capacity of biological tissues to undergo self-healing is crucial for the performance of functions and the continuation of life.Conventional intrinsic self-healing materials demonstrate analogous functionality dep...The capacity of biological tissues to undergo self-healing is crucial for the performance of functions and the continuation of life.Conventional intrinsic self-healing materials demonstrate analogous functionality depending on the dissociation-recombination of reversible bonds with no need of extra repair agents.However,the trade-off relationship between mechanical strength and self-healing kinetics in intrinsic self-healing systems,coupled with the lack of additional functionality,restricts their service life and practical applications.Diversified highly ordered structures in organisms significantly affect the energy dissipation mechanism,signal transmission efficiency,and molecular network reconstruction capability due to their multi-dimensional differentiated macroscopic composite constructions,microscopic orientation textures,and topologies/bonding types at molecular level.These architectures exhibit distinctive strengthening mechanisms and functionalities,which provide valuable references.This review aims at providing the current status of advanced intrinsic self-healing materials with biomimetic highly ordered internal micro/nanostructures.Through highlighting specific examples,the classifications,design inspirations,and fabrication strategies of these newly developed materials based on integrating dynamic interactions with ordered nano/microstructures are outlined.Furthermore,the strengthening and selfhealing balance mechanisms,structure–functionalization relationships,and potential application values are discussed.The review concludes with a perspective on the challenges,opportunities,and prospects for the development,application,and promotion of self-healable materials with bio-like ordered architectures.展开更多
基金supported by Basic and Applied Basic Research Foundation of Guangdong Province(No.2024A1515010772)State Key Laboratory of Massive Personalized Customization System and Technology,No.H&C-MPC-2023-02-06(Q)+2 种基金“CUG scholar”Scientific Research Funds at China University of Geosciences,Wuhan(No.CUG2022185)Guangzhou Youth Top Talent ProgramChina College Student Innovation and Entrepreneurship Training Program(No.S202410491063).
文摘With the continuously increasing awareness of energy conservation and the intensifying impacts of global warming, Personal Thermal Management (PTM) technologies are increasingly recognized for their potential to ensure human thermal comfort in extreme environments. Biomimetic structures have emerged as a novel source of inspiration for PTM applications. This review systematically summarizes the biomimetic structures, phase change materials, manufacturing methods, and the performance of multifunctional PTM wearables. Firstly, it analyzes the biomimetic structures with thermal regulation and encapsulated phase change material functionalities from different dimensions, highlighting their applications in PTM. Subsequently, it outlines the conventional manufacturing methods incorporating various biomimetic structures, offering strategies for the production of PTM wearables. The review also discusses the typical performance characteristics of multifunctional PTM wearables, addressing the current demands in thermal management. Finally, opportunities and challenges in PTM field are proposed, proposing new directions for future research.
基金This work is financially supported by“National Natural Science Foundation of China”(Grant No.51606214).
文摘Nowadays,the utilization rate of electronic products is increasing while showing no obvious sign of reaching a limit.To solve the associated“internal heat generation problem”,scientists have proposed two methods or strategies.The first approach consists of replacing the heat exchange medium with a nanofluid.However,the high surface energy of the nanoparticles makes them prone to accumulate along the heat transfer surface.The second method follows a different approach.It tries to modify the surface structure of the electronic components in order to reduce the fluid-dynamic drag and improve the rate of heat exchange.This article reviews these effects considering different types of nanofluid and different shapes,sizes,and arrangements of“biomimetic grooves”.The idea to use these two methods in a combined fashion(to improve heat transfer and reduce flow resistance at the same time)is also developed and discussed critically to a certain extent.
基金supported by Nature Science Foun-dations of China(NSFC)under grant Nos.U21B2052 and 52102057。
文摘Plasma spray physical vapor deposition(PS-PVD)(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)(GYbZ)thermal barrier coatings(TBCs)exhibited better silicate-phobicity than coatings produced by electron beam physical vapor depo-sition.In combination with PS-PVD and ultrafast laser direct writing technology,biomimetic structured GYbZ TBCs,with a triple-scale micro/nano surface microstructure,were obtained.Laser ablating on the PS-PVD GYbZ coating enhanced the surface roughness,improving its wear resistance without increasing the surface hardness.Furthermore,during the laser ablation processing,numerous nanoparticles were deposited in-situ in the gaps between columns of the coating,reducing the coating Young’s modulus.The simulated temperature field and heat flux field demonstrated that the presence of numerous interfaces between small columns of the PS-PVD coatings is beneficial to thermal insulation.However,laser ablation decreased the coating thickness,reducing the thermal insulation by around 20%-30%as compared to its PS-PVD counterpart,suggesting that a moderate increase in the coating thickness should be considered when designing an efficient TBC system.
基金supported by the National Natural Science Foundation of China(22409065)the Guangdong Basic and Applied Basic Research Foundation(2022A1515011906)+2 种基金the China Postdoctoral Science Foundation(2023M731153)the Research Fund Program of Guangdong Provincial Key Laboratory of Fuel Cell Technologythe Postdoctoral Fellowship Program of CPSF(GZC20230868).
文摘The application of conventional manganese dioxide(MnO_(2))materials in sodium-ion supercapacitors(Na-SCs)is considerably limited by their low conductivity and structural instability.Biomimetic morphology engineering can optimize the electrochemical performance of MnO_(2).Here,based on the metal-organic frameworks(MOFs)-derived method and electrochemical reconstruction,a coral-like MnO_(2)structure integrated with a functional nitrogen-doped carbon(NC)coating is designed for Na-SC application.The bioinspired coral-like structure captures numerous electrolyte ions and increases the Na+concentration on the electrode surface,which is beneficial for optimizing the Na+transport pathway and accelerating the electrode reaction kinetics.Moreover,the coral-like crosslinked structure effectively enhances the mechanical properties,enabling the maintenance of the structure of MnO_(2)-based electrodes during long-term operation.Furthermore,in/ex-situ characterizations are performed to elucidate the mechanism of lattice transformation during electrochemical phase reconstruction.Additionally,the theoretical calculation and simulation results reveal the ion/electron dynamics in the fabricated electrode.The prepared electrode demonstrates excellent capacitance storage ability(340.7 F g^(−1)at 0.5 A g^(−1))and cycling stability(85.1%capacitance retention after 10,000 cycles).The assembled hybrid device exhibits exceptional life-span(82.0%capacitance retention after 10,000 cycles)and exceptional energy density(36.5 Wh kg^(−1)).This study provides a reliable biomimetic morphology design strategy for MnO_(2)cathodes,paving the way for the fabrication of high-performance Na-SCs.
基金National Natural Science Foundation of China,Grant/Award Numbers:22179005,92372207。
文摘Lithium metal anode is one of the ideal anode materials for the next generation of high-energy-density battery systems.Unfortunately,the uneven nucleation of Li leads to dendrite growth and volume changes during cycling,resulting in poor electrochemical performance and potential safety hazards,which hinder its practical application.In this work,a low-cost chicken-bonederived carbon material(CBC)with a biomimetic structure was designed and synthesized using a simple one-step carbonization method.Combining theoretical calculations and experimental results,the self-doped N and S heteroatoms in CBC are demonstrated to effectively reduce the binding energy with Li atoms and lower the nucleation overpotential.After uniform nucleation,the Li metal grows in a spherical shape without dendrites,which is related to the reduction of the local current density inside the biomimetic crosslinking structure of CBC.Benefiting from this favorable Li growth behavior,the Li@CBC electrode achieves ultra-low nucleation overpotential(15.5 mV at 0.1 mA cm^(−2))and superdense lithium deposition(zero volume expansion rate at a capacity of 2 mAh cm^(−2))without introducing additional lithiophilic sites.The CBC retains a high Coulombic efficiency of over 98%in 479 cycles(1 mA cm^(−2)and 1 mAh cm^(−2))when applied in a half-cell with Li,and shows an excellent rate and cycling performance when applied in a full cell with LiFePO4 as the cathode.
基金supported by the National Natural Science Foundation of China(52175270)the Project of Scientifc and Technological Development Plan of Jilin Province(20220508130RC)+3 种基金the Science and Technology Development Program of Jilin Province(YDZJ202501ZYTS370)the Scientific Research Project of Education Department of Jilin Province(JJKH20251196KJ)the Scientific Research Project of Education Department of Jilin Province(JJKH20251195KJ)the Key Project of State Key Laboratory of Changchun City(23GZZ14).
文摘Flexible piezoresistive sensors based on biomimetic microstructures are prospective for broad application in motion monitoring.However,the design and preparation processes of most biomimetic microstructures in the existing studies are complicated,and there are few studies on pore size control.Herein,the porous structure of human bones was used as a biomimetic prototype,and optimally designed by creating a theoretical equivalent sensor model and a finite element model.Soluble raw materials such as sugar and salt in different particle sizes were pressed into porous templates.Based on the template method,porous structures in different pore sizes were prepared using polydimethylsiloxane(PDMS)polymer as the substrate.On this basis,graphene oxide conductive coating was prepared with the modified Hummers method and then deposited via dip coating onto the substrate.Finally,a PDMS-based porous structure biomimetic flexible piezoresistive sensor was developed.Mechanically,the deformation of the sensor under the same load increased with the pore size rising from 0.3 to 1.5 mm.Electrically,the resistance rang of the sensor was enlarged as the pore size rose.The resistance variation rates of samples with pore sizes of 0.3,1.0,and 1.5 mm at approximately the 200th cycle were 63%,79%,and 81%,respectively;at the 500th cycle,these values were 63%,77%,and 79%;and at the 1000th cycle,they stabilized at 63%,74%,and 76%.These results indicate that the fabricated sensor exhibits high stability and fatigue resistance.At the pressure of 0–25 kPa,the sensitivity rose from 0.0688 to 0.1260 kPa−1,and the performance was enhanced by 83%.After 1,000 cycles of compression testing,the signal output was stable,and no damage was caused to the substrate.Further application tests showed the biomimetic sensor accurately and effectively identified human joint motions and gestures,and has potential application value in human motion monitoring.
文摘The lightweight design of hydraulic quadruped robots,especially the lightweight design of the leg joint Hydraulic Drive Unit(HDU),can improve the robot's response speed,motion speed,endurance,and load capacity.However,the lightweight design of HDU is a huge challenge due to the need for structural strength.This paper is inspired by the geometric shape of fish bones and biomimetic reinforcing ribs on the surface of the HDU shell are designed to increase its strength and reduce its weight.First,a HDU shell with biomimetic fish bone reinforcing ribs structure is proposed.Then,the MATLAB toolbox and ANSYS finite element analysis module are used to optimize the parameters of the biomimetic reinforcing ribs structure and the overall layout of the shell.Finally,the HDU shell is manufactured using additive manufacturing technology,and a performance testing platform is built to conduct dynamic and static performance tests on the designed HDU.The experimental results show that the HDU with biomimetic fish bone reinforcing ribs has excellent dynamic performance and better static performance than the prototype model,and the weight of the shell is reduced by 20%compared to the prototype model.This work has broad application prospects in the lightweight and high-strength design of closed-pressure vessel components.
基金The financial support of this work by the Natural Science Foundation of Hebei province of China (No. F2020202015)。
文摘Simulating the structures and behaviors of living organisms are of great significance to develop novel multi-functional intelligent devices. However, the development of biomimetic devices with complex deformable structures and synergistic properties is still on the way. Herein, we propose a simple and effective approach to create the multi-functional stimuli-responsive biomimetic devices with independently pre-programmable colorful visual patterns, complex geometries and morphable modes. The metal organic framework(MOF)-based composite film acts as a rigidity actuation substrate to support and mechanically guide the spatial configuration of the soft chiral nematic liquid crystal elastomer(CLCE) sheet. We can directly program the structural color of the CLCE sheet by adjusting the thickness distribution without tedious chemical modification. By using this coordination strategy, we fabricate an artificial flower, which exhibits a synergistic effect of both shape transformation and color change like paeonia ‘Coral Sunset’at different flowering stages, and can even perform different flowering behaviors by bending, twisting and curling petals. The assembled bionic flower is innovatively demonstrated to respond to local stimuli of humidity, heat or ultraviolet irradiation. Therefore, the spatial assembly of CLCE combined with functional MOF materials has a wide range of potential application in multi-functional integrated artificial systems.
基金the financial support provided by Projects(No.2020CDJXZ001)supported by the Fundamental Research Funds for the Central Universities。
文摘Inspired by nature,the design and synthesis of novel biomimetic materials are gradually attracting the attention of scientists.Biomimetic materials with excellent performance are widely applied in medical health,industrial production,agricultural planting,aerospace,etc.As a natural porous biomass material,diatomite has the advantages of high porosity,low bulk density,stable chemical property and large surface area.Benefiting from these advantages,it is of great importance to treat diatomite as bionic substrate to synthesize diatomite biomimetic materials,which can be endowed good structure stability and natural mechanical property.It is an ideal option for crystal growth and uniform dispersion of nanostructures,to improve the agglomeration and high cost of nanomaterials.This review briefly introduces our recent achievements on diatomite biomimetic materials in different application fields.In view of its excellent optical,thermal,chemical and mechanical property,diatomite biomimetic materials have shown extensive application potential in various fields of science and engineering,which include catalysis,corrosion protection,microwave adsorption,super-hydrophobicity,pollutant adsorption,energy storage,etc.It demonstrates that diatomite biomimetic materials with different functional properties can be synthesized by diverse chemical means and preparation methods for different application.By composed of inorganic nanomaterial hybrid,this diatomite biomimetic materials display a three-dimensional network structure with diatomite morphology.The design and synthesis of diatomite biomimetic materials provide more potential bionic categories for different applications,which can accelerate the development of low-cost and high-performance biomimetic materials.
基金by the Opening Funding of the State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology(P2020-010)the National Natural Science Foundation of China(Nos.51521001 and 51832003)。
文摘Using chitin as the templating material,we obtained layered nanocomposites like shrimp or crab shells via a sol-gel self-assembly process.SEM images show a layered structure and XRD patterns present a typical peak of chitin,which indicates the templating role of chitin in the as-received hybrid samples.Additionally,the layer spacing of chitin/silica hybrid materials is reduced with increasing content of silica.After the heat treatment for carbonization,layered SiOC nanocomposites with mesoporous structures were obtained and showed good dye adsorption performance.The present study demonstrates a reliable and self-assembly synthesis technique for the development of advanced high-performance nanocomposites with biomimetic nanostructures.
基金supported by Zhejiang Provincial Natural Science Foundation of China(Nos.LQ23F050006,LQ21E020005)the National Natural Science Foundation of China(No.52002365).
文摘Ultra-thin electromagnetic wave(EMW)absorbers present challenging demands on EMW absorption performance.Drawing inspiration from heather leaf structures,this study introduces an innovative design strategy for EMW absorbing material,proposing biomimetic leaf SnO_(2) structures(bio-SnO_(2))on carbon fabric(CF).By employing leaf-shaped SnS2 as precursors,biomimetic leaf SnO_(2) nanostructures are constructed on CF surface after a simple thermal treatment,resulting in bio-SnO_(2)@CF composite.Experimental results indicate that bio-SnO_(2)@CF exhibits an exceptional minimum reflection loss of-54.8 dB at an incredibly thin thickness of 1.2 mm.Radar cross section(RCS)simulations further validate the outstanding EMW attenuation ability of bio-SnO_(2)@CF,attaining a maximum RCS reduction value of 16.9 dBm^(2) at an incident wave angle ofθ=0°.This novel research showcases the biomimetic structural design strategy and its remarkable function in enhancing the EMW absorbing performance at ultra-thin absorber thickness.
基金sponsored by the National Key Research and Development Program of China(2021YFC2501800)the National Natural Science Foundation of China(No.U1909218)the Science Fund for Creative Research Groups of the National Natural Science Foundation of China(No.T2121004).
文摘Lung diseases associated with alveoli,such as acute respiratory distress syndrome,have posed a long-term threat to human health.However,an in vitro model capable of simulating different deformations of the alveoli and a suitable material for mimicking basement membrane are currently lacking.Here,we present an innovative biomimetic controllable strain membrane(BCSM)at an air–liquid interface(ALI)to reconstruct alveolar respiration.The BCSM consists of a high-precision three-dimensional printing melt-electrowritten polycaprolactone(PCL)mesh,coated with a hydrogel substrate—to simulate the important functions(such as stiffness,porosity,wettability,and ALI)of alveolar microenvironments,and seeded pulmonary epithelial cells and vascular endothelial cells on either side,respectively.Inspired by papercutting,the BCSM was fabricated in the plane while it operated in three dimensions.A series of the topological structure of the BCSM was designed to control various local-area strain,mimicking alveolar varied deformation.Lopinavir/ritonavir could reduce Lamin A expression under over-stretch condition,which might be effective in preventing ventilator-induced lung injury.The biomimetic lung-unit model with BCSM has broader application prospects in alveoli-related research in the future,such as in drug toxicology and metabolism.
基金supported by the National Key R&D Program of China(Grant No.2024YFA1107800)the Chinese Academy of Medical Sci-ences Innovation Fund for Medical Sciences(2021-I2M-1-052)+2 种基金the National Natural Science Foundation of China(82371796)the Beijing Natural Science Foundation(7244400)the Fundamental Research Funds for the Central Universities(3332024056).
文摘The construction and regeneration of tissue-engineered auricles are pacesetters in tissue engineering and have realized their first international clinical application.However,the unstable regeneration quality and insufficient mechanical strength have become significant obstacles impeding its clinical promotion.The perichondrium is indispensable for the nutritional and vascular supply of the underlying cartilage tissue,as well as for proper anatomical functioning and mechanical performance.This study presents a novel strategy for integrated con-struction of bioengineered perichondrium with bioprinted cartilage to enhance the regeneration quality and mechanical properties of tissue-engineered auricles.Simulating the anatomical structure of the native auricle designs a sandwich construction model containing bilateral perichondrium and intermediate cartilage,employing a photocrosslinkable acellular cartilage matrix and gelatin bionics matrix microenvironment,applying co-cultured auricular chondrocytes and adipose-derived stem cells creates functional cell populations,designing hatch patterns imitates microscopic arrangement structures,utilizing sacrificial materials forms interlaminar network traffic to enhance the tight connection between layers,and finally,assessing the regen-erative quality of the constructs explores their feasibility and stability.The multi-level and multi-scale bio-mimetic construction strategy overcomes the technical limitation of the integrated construction of perichondrium-wrapped auricles and realizes biomimicry in morphology,structure,and biomechanics.Alto-gether,this study provides a technical reference for the hierarchical construction of complex tissues and pro-motes the clinical translation and application of engineered tissues or organs.
基金supported by the National Key Research and Development Program of China(Nos.2018YFE0202201 and 2021YFA0715700)the National Natural Science Foundation of China(Nos.21701161 and 22293044)the Key Scientific Research Foundation of the Education Department of Anhui Province(No.2022AH050702)。
文摘Chitin hydrogel has been recognized as a promising material for various biomedical applications because of its biocompatibility and biodegradability.However,the fabrication of strong chitin hydrogel remains a big challenge because of the insolubility of chitin in many solvents and the reduced chain length of chitin regenerated from solutions.We herein introduce the fabrication of chitin hydrogel with biomimetic structure through the chemical transformation of chitosan,which is a water-soluble deacetylated derivative of chitin.The reacetylation of the amino group in chitosan endows the obtained chitin hydrogel with outstanding resistance to swelling,degradation,extreme temperature and pH conditions,and organic solvents.The chitin hydrogel has excellent mechanical properties while retaining a high water content(more than 95 wt.%).It also shows excellent antifouling performance that it resists the adhesion of proteins,bacteria,blood,and cells.Moreover,as the initial chitosan solution can be feasibly frozen and templated by ice crystals,the chitin hydrogel structure can be either nacre-like or wood-like depending on the freezing method of the precursory chitosan solution.Owing to these anisotropic structures,such chitin hydrogel can exhibit anisotropic mechanics and mass transfer capabilities.The current work provides a rational strategy to fabricate chitin hydrogels and paves the way for its practical applications as a superior biomedical material.
基金the National Natural Science Foundation of China(No.51774028).
文摘The design and preparation of cost-effective and durable catalysts for electrochemical water splitting are significant for the development and application of hydrogen production.Herein,inspired by the underwater superaerophobicity of fish scales,a three-dimensional multilevel nanoarray electrode with superaerophobicity was designed and fabricated by the hydrothermal method to solve the bubble shielding effect in electrochemical reactions.Benefiting from the high specific surface area,superaerophobic properties,Al doping,the Al-CoS_(2)nanosheets(NSs)/nickel foam(NF)-30 exhibits outstanding electrocatalytic activity and superior durability for electrochemical water splitting in 1 M KOH.Significantly,the Al-CoS_(2)NSs/NF-30 only required extremely low overpotential of 176 mV for oxygen evolution reaction(OER)to reach a current density of 10 mA·cm^(-2).Al-CoS_(2)NSs/NF-30 was employed as bifunctional electrode for electrochemical water splitting with a cell voltage of 1.58 V at 10 mA·cm^(-2).Meanwhile,Al-CoS_(2) NSs/NF-30 exhibited excellent durability(250 h@10 mA·cm^(-2)and 50 h@100 mA·cm^(-2)).The cobalt-based catalyst(Al-CoS_(2) NSs/NF-30)with superaerophobicity exhibits excellent performance in activity and durability,therefore is a promising electrochemical water splitting catalyst.
基金supported by the National Key Research and Development Program of China(No.2023YFC2412402)the Key Research and Development Program of Hubei Province(No.2022ACA002).
文摘The frequent failures of small-diameter vascular grafts(SDVGs)mainly result from thrombosis and insufficient endothelialization.Despite recent biochemical modification strategies aiming to enhance long-term patency,the challenges of suppressing thrombosis and promoting rapid endothelialization persist.We thus designed a biomimetic three-layer flexible vascular graft scaffold.This scaffold precisely replicates the nonlinear mechanical responses of vascular tissues and promotes vascular regeneration by minimizing the mechanical mismatch between the graft and the host.The biomimetic flexible SDVG scaffold comprises a screwed inner layer,a middle fabric layer,and a Polyethylene terephthalate(PET)helical coil.It shows excellent bending resistance and resilience,reducing thrombosis formation caused by impaired blood flow during bending.Moreover,this scaffold notably improves the adhesion,spreading,proliferation,and elongation of endothelial cells,facilitating luminal remodeling and maintaining long-term patency through its intimal topography.In vivo studies demonstrate that the endothelial layer forms within three months of implantation,ensuring long-term patency.By three months after implantation,both the endothelial and smooth muscle layers are regenerated,developing hierarchical microstructures and compositions similar to those of native vessels.The biomimetic flexible vascular graft with screwed structures exhibits excellent bending resistance and enhanced vascular remodeling,thereby promoting blood vessel regeneration and showing strong potential for clinical translation.
基金support from the National Natural Science Foundation of China(32425031,32301113)the Science and Technology Innovation Project of Shanghai Science and Technology Committee(24CL2900800)+1 种基金the Zhejiang Natural Science Foundation(Z25E030005)the Shanghai Sailing Program(23YF1409700).
文摘Corneal transplantation presents an urgent demand for artificial cornea stromal substitutes(ACSs)with comprehensive functional design,spanning from material biology to clinical application.Here,we report the use of an engineering integration strategy to develop Janus ACSs with collagen-based multiscale biomimetic skel-etons and tissue-adhesion.Specifically,the electro-assembly of collagen is employed to construct the skeleton of Janus ACS that mimics the microstructure and macroscopic morphology of native corneal stroma,ensuring the desired transparency,refractive power and adaptable shape.The bi-component"bio-cement"coating on the surface of skeleton,composed of 4-arm polyethylene glycol succinyl succinate andε-polylysine,undergoes fast and mild amidation reactions driven by interfacial moisture,curing into a transparent hydrogel coating.The coating establishes a stable covalent connection between the corneal stroma and the skeleton,achieving im-mediate(<10 s)and stable tissue adhesion to adapt to the wet,dynamic mechanical environment of the eye.In vitro and in vivo studies further confirmed that the customized bio-adhesive Janus ACSs allow sutureless im-plantation and facilitate corneal epithelialization,stroma integration and reconstruction.A foraging behavior test highlighted the significant advantages of Janus ACSs in rapid vision recovery.The engineered integrated manufacturing of Janus ACSs potentially maximizes practicality while minimizing costs in applications.
基金This work was supported by the National Natural Science Foundation of China(Grant No.51875102)。
文摘This study utilized cantilever experiments to investigate the vibration properties of multibody molded beetle elytron plates(BEPs),which is a type of biomimetic sandwich plate inspired by beetle elytra;the corresponding shear characteristics were further revealed by a finite element method(FEM). The following results were obtained:(1) Experimental results suggest that the maximum displacement response of the BEPs was about 25% less than that of a honeycomb plate with almost the same first natural frequency,which indicates that a BEP with reasonable structural parameters has the potential to replace a honeycomb plate to achieve better vibration performance;(2) The trabecular structure not only enhanced the shear stiffness of the core layer in column areas but also the skins in the honeycomb wall areas,thus changing the distribution of the shear force in the different components and improving the mechanical performances of the BEP;and(3) Although this enhancement effect from trabeculae was not uniform,the average shear force proportion of the skins(or core structure) in the entire BEP structure was very close to that of the honeycomb plate. Therefore,the shear calculation assumption used for honeycomb plates is still applicable in the BEP.The results provide an experimental basis for the design and application of BEPs and inspiration for the development of related products in vibrational environments.
基金supported by the National Natural Science Foundation of China(Grant Nos.51875102,51578136).
文摘To improve the applications of beetle elytron plates(BEPs,which are biomimetic sandwich plates inspired by beetle elytra),the flexural performance and its synergistic mechanism of multibody molded BEPs were investigated via cantilever testing and finite element method(FEM).The results are summarized as follows.(1)Although debonding damage causes failure of the multibody molded BEPs and honeycomb plate and the reasonable range of trabecular size for BEPs is narrow,both the optimal loading capacity per mass and failure deformation of the BEPs are over two times those of the honeycomb plate.(2)A flexural synergistic mechanism is revealed in the trabecular-honeycomb core structure of BEPs;this mechanism causes the maximum deformation of core structure to gradually transfer from the honeycomb wall to the trabeculae with the increase inη(the ratio of the trabecular radius to the distance between the center points of two trabeculae),which means the different stretching behaviors in these core structures.(3)Unlike the compressive mechanism of BEPs,by controlling and balancing the deformation degrees of the trabeculae and honeycomb walls,the flexural mechanism achieves a minimum core deformation and an optimal flexural performance.These results suggest a qualitative relationship between the deformation behavior of trabecular-honeycomb core structure and bending performance of the whole BEP,and provide a solid foundation for subsequent research and the considerable application potential of this biomimetic sandwich structure in many fields.
基金National Natural Science Foundation of China,Grant/Award Numbers:52373116,52173112。
文摘The capacity of biological tissues to undergo self-healing is crucial for the performance of functions and the continuation of life.Conventional intrinsic self-healing materials demonstrate analogous functionality depending on the dissociation-recombination of reversible bonds with no need of extra repair agents.However,the trade-off relationship between mechanical strength and self-healing kinetics in intrinsic self-healing systems,coupled with the lack of additional functionality,restricts their service life and practical applications.Diversified highly ordered structures in organisms significantly affect the energy dissipation mechanism,signal transmission efficiency,and molecular network reconstruction capability due to their multi-dimensional differentiated macroscopic composite constructions,microscopic orientation textures,and topologies/bonding types at molecular level.These architectures exhibit distinctive strengthening mechanisms and functionalities,which provide valuable references.This review aims at providing the current status of advanced intrinsic self-healing materials with biomimetic highly ordered internal micro/nanostructures.Through highlighting specific examples,the classifications,design inspirations,and fabrication strategies of these newly developed materials based on integrating dynamic interactions with ordered nano/microstructures are outlined.Furthermore,the strengthening and selfhealing balance mechanisms,structure–functionalization relationships,and potential application values are discussed.The review concludes with a perspective on the challenges,opportunities,and prospects for the development,application,and promotion of self-healable materials with bio-like ordered architectures.
