Human action recognition(HAR)is crucial for the development of efficient computer vision,where bioinspired neuromorphic perception visual systems have emerged as a vital solution to address transmission bottlenecks ac...Human action recognition(HAR)is crucial for the development of efficient computer vision,where bioinspired neuromorphic perception visual systems have emerged as a vital solution to address transmission bottlenecks across sensor-processor interfaces.However,the absence of interactions among versatile biomimicking functionalities within a single device,which was developed for specific vision tasks,restricts the computational capacity,practicality,and scalability of in-sensor vision computing.Here,we propose a bioinspired vision sensor composed of a Ga N/Al N-based ultrathin quantum-disks-in-nanowires(QD-NWs)array to mimic not only Parvo cells for high-contrast vision and Magno cells for dynamic vision in the human retina but also the synergistic activity between the two cells for in-sensor vision computing.By simply tuning the applied bias voltage on each QD-NW-array-based pixel,we achieve two biosimilar photoresponse characteristics with slow and fast reactions to light stimuli that enhance the in-sensor image quality and HAR efficiency,respectively.Strikingly,the interplay and synergistic interaction of the two photoresponse modes within a single device markedly increased the HAR recognition accuracy from 51.4%to 81.4%owing to the integrated artificial vision system.The demonstration of an intelligent vision sensor offers a promising device platform for the development of highly efficient HAR systems and future smart optoelectronics.展开更多
Liquid leakage of pipeline networks not only results in considerableresource wastage but also leads to environmental pollution and ecological imbalance.In response to this global issue, a bioinspired superhydrophobic ...Liquid leakage of pipeline networks not only results in considerableresource wastage but also leads to environmental pollution and ecological imbalance.In response to this global issue, a bioinspired superhydrophobic thermoplastic polyurethane/carbon nanotubes/graphene nanosheets flexible strain sensor (TCGS) hasbeen developed using a combination of micro-extrusion compression molding andsurface modification for real-time wireless detection of liquid leakage. The TCGSutilizes the synergistic effects of Archimedean spiral crack arrays and micropores,which are inspired by the remarkable sensory capabilities of scorpions. This designachieves a sensitivity of 218.13 at a strain of 2%, which is an increase of 4300%. Additionally, it demonstrates exceptional durability bywithstanding over 5000 usage cycles. The robust superhydrophobicity of the TCGS significantly enhances sensitivity and stability indetecting small-scale liquid leakage, enabling precise monitoring of liquid leakage across a wide range of sizes, velocities, and compositionswhile issuing prompt alerts. This provides critical early warnings for both industrial pipelines and potential liquid leakage scenariosin everyday life. The development and utilization of bioinspired ultrasensitive flexible strain sensors offer an innovative and effectivesolution for the early wireless detection of liquid leakage.展开更多
Bioinspired superhydrophobic surfaces have been used for drag reduction.However,the secondary structures and the air cushions on these surfaces could be destructed in a flow,losing the effect of drag reduction.Here,a ...Bioinspired superhydrophobic surfaces have been used for drag reduction.However,the secondary structures and the air cushions on these surfaces could be destructed in a flow,losing the effect of drag reduction.Here,a stainless-steel surface with mushroom-like cross-section(SMC)and diamond cavities(SMCD)having a drag reduction rate up to 19.37%is developed by 3D printing.The concealed re-entrant structures in SMCD prevent the infiltration of water into the chamber and form gas cushions,which converts the sliding friction at liquid-solid interface into rolling friction at liquid-gas interface,realizing the drag reduction.Meanwhile,98.3%of air can be maintained in the chamber in a flow with Reynolds number(Re)of 9×10^(5),ensuring the drag reduction in a high-velocity flow.Moreover,the continuous top stainless-steel surface and the supporting mesh network protect the critical re-entrant structures,ensuring the robustness of SMC.With the bioinspired design and one-step additive manufacturing process,SMC holds great potential for large-area production and applications requiring robust drag reduction.展开更多
The field of photocatalysis has witnessed a significant advancement in the development of bioinspired and biomimetic photocatalysts for various biomedical applications,including drug delivery,tissue engineering,cancer...The field of photocatalysis has witnessed a significant advancement in the development of bioinspired and biomimetic photocatalysts for various biomedical applications,including drug delivery,tissue engineering,cancer therapy,and bioimaging.Nature has evolved efficient light-harvesting systems and energy conversion mechanisms,which serve as a benchmark for researchers.However,reproducing such complexity and harnessing it for biomedical applications is a daunting task.It requires a comprehensive understanding of the underlying biological processes and the ability to replicate them synthetically.By utilizing light energy,these photocatalysts can trigger specific chemical reactions,leading to targeted drug release,enhanced tissue regeneration,and precise imaging of biological structures.In this context,addressing the stability,long-term performance,scalability,and costeffectiveness of these materials is crucial for their widespread implementation in biomedical applications.While challenges such as complexity and stability persist,their advantages such as targeted drug delivery and personalized medicine make them a fascinating area of research.The purpose of this review is to provide a comprehensive analysis and evaluation of existing research,highlighting the advancements,current challenges,advantages,limitations,and future prospects of bioinspired and biomimetic photocatalysts in biomedicine.展开更多
The advent of antibiotics revolutionized the management of bacterial infections,yet their clinical efficacy is catastrophically undermined by the global emergence of antimicrobial resistance(AMR).Furthermore,the situa...The advent of antibiotics revolutionized the management of bacterial infections,yet their clinical efficacy is catastrophically undermined by the global emergence of antimicrobial resistance(AMR).Furthermore,the situation is aggravated by the fact that the formation of bacterial biofilm on material surfaces significantly enhances their tolerance to antibiotics.Therefore,there is an urgent need for new approaches that employ antibacterial mechanisms distinct from those of conventional antibiotics to mitigate the risk of AMR.Recently,naturally occurring surfaces found on typical plants and insects that take advantage of physical topography can either inhibit bacterial adhesion or directly inactivate bacterial cells,showing innovative“outside-the-box”prospects for antibacterial applications and garnering considerable interest due to their drug-free nature.Bioinspired micro-/nanostructures that mimic natural surface patterns have been replicated on various biomaterials to enhance their antibacterial properties.This review summarizes and explains the current advances in bioinspired antibacterial surfaces,as well as the underlying mechanisms of various strategies.Subsequently,synergistic antimicrobial surfaces,comprising a combination of various physical antibacterial strategies,are reviewed to highlight their potential for highly efficient disinfection and long-lasting antibacterial performance.Finally,the biomedical applications,coupled with the future challenges of bio-inspired antibacterial strategies,were further discussed.We hope this review could provide valuable insights for developing innovative,antibiotic-free antibacterial strategies that deliver powerful performance in combating AMR.展开更多
Rapid and robust identification of bacteria is crucial for environmental monitoring and clinical diagnosis.Herein,a bioinspired interface-mediated multichannel sensor array was developed based on three-coloremitting a...Rapid and robust identification of bacteria is crucial for environmental monitoring and clinical diagnosis.Herein,a bioinspired interface-mediated multichannel sensor array was developed based on three-coloremitting antimicrobial functional carbon dots(FCDs)and concanavalin A doped polydopamine nanoparticles(Con A-PDA)for identification of bacteria.In this sensor,the fluorescence intensity of the three FCDs was quenched by the Con A-PDA.Upon addition different types of bacteria,the fluorescence intensity of the three FCDs was restored or further quenched.Recur to statistical analysis methods,it is employed to accurately discriminate 10 types of bacteria(including three probiotics and seven pathogenic bacteria)in natural water samples and human urine samples.The discrimination ability of the sensor array was highly enhanced via different competing binding of the FCDs and the bacteria toward Con A-PDA.The proposed array-based method offers a rapid,high-throughput,and reliable sensing platform for pathogen diagnosis in the field of environmental monitoring and clinical diagnosis.展开更多
Treatment of intracranial gliomas has increasingly favored minimally invasive surgery,with a growing focus on leveraging microrobots for efficient drug delivery while overcoming the impact of body fluids.Inspired by h...Treatment of intracranial gliomas has increasingly favored minimally invasive surgery,with a growing focus on leveraging microrobots for efficient drug delivery while overcoming the impact of body fluids.Inspired by honeybee stingers,this study proposed a novel microspike robot.This robot firmly adhered to the tissue surface,enabling direct drug delivery from a hydrogel on its back into the targeted tissue via microspikes.The drug delivery rate was influenced by temperature and could be controlled by an alternating magnetic field.Microrobots could be delivered rapidly through a clinical Ommaya reservoir into the postoperative cavity or ventricle of the skull.The microrobot could be actuated for adhesion and retrieval,with its motion posture and trajectory highly precisely controlled by external magnetic fields.Biological experiments confirmed the excellent biocompatibility and biosafety of the microspike robot and demonstrated its effectiveness in treating gliomas by loading unconventional therapeutic drugs.The proposed microspike robot has significant potential for long-term drug delivery to target gliomas and other future clinical applications.展开更多
Photothermal catalysis utilizing the full solar spectrum to convert CO_(2)and H2O into valuable products holds promise for sustainable energy solutions.However,a major challenge remains in enhancing the photothermal c...Photothermal catalysis utilizing the full solar spectrum to convert CO_(2)and H2O into valuable products holds promise for sustainable energy solutions.However,a major challenge remains in enhancing the photothermal conversion efficiency and carrier mobility of semiconductors like Bi_(2)MoO_(6),which restricts their catalytic performance.Here,we developed a facile strategy to synthesize vertically grown Bi_(2)MoO_(6)(BMO)nanosheets that mimic a bionic butterfly wing scale structure on a biomass-derived carbon framework(BCF).BCF/BMO exhibits high catalytic activity,achieving a CO yield of 165μmol/(g·h),which is an increase of eight times compared to pristine BMO.The wing scale structured BCF/BMO minimizes sunlight reflection and increases the photothermal conversion temperature.BCF consists of crystalline carbon(sp^(2)-C region)dispersed within amorphous carbon(sp^(3)-C hybridized regions),where the crystalline carbon forms“nano-islands”.The N-C-O-Bi covalent bonds at the S-scheme heterojunction interface of BCF/BMO function as electron bridges,connecting the sp^(2)-C nano-islands and enhancing the multilevel built-in electric field and directional trans-interface transport of carriers.As evidenced by DFT calculation,the rich pyridinic-N on the carbon nano-island can establish strong electron coupling with CO_(2),thereby accelerating the cleavage of*COOH and facilitating the formation of CO.Biomass waste-derived carbon nano-islands represent advanced amorphous/crystalline phase materials and offer a simple and low-cost strategy to facilitate carrier migration.This study provides deep insights into carrier migration in photocatalysis and offers guidance for designing efficient heterojunctions inspired by biological systems.展开更多
After millions of years of natural evolution,horsetails have evolved unique stem structures that enable survival in harsh environments.Inspired by the cross-sectional characteristics of horsetail stems,a series of bio...After millions of years of natural evolution,horsetails have evolved unique stem structures that enable survival in harsh environments.Inspired by the cross-sectional characteristics of horsetail stems,a series of bioinspired sandwich structures were designed and fabricated using the laser powder bed fusion(LPBF)process.By combining experimental and finite element simulation methods,the formability,mechanical properties,deformation behavior,and thermal conduction performance of these structures were determined.Results show that the surface morphology of the bioinspired sandwich structures was smooth,with no cracks observed.The bioinspired sandwich structure with an inner tube diameter of 1.9 mm(D_(1.9))exhibited optimal comprehensive mechanical properties,with a specific strength of 64.2 MPa/(g/cm^(3)),and specific energy absorption of 3.3 J/g.Stress distribution results revealed that the D_(1.9)structures had the most uniform stress distribution.Furthermore,increasing the internal conduction paths improved heat transfer;therefore,the thermal conductivities of the D_(1.4),D_(1.9),and D_(2.4)structures were higher than that of the D0 structure.This study demonstrates that a bioinspired design approach,combined with additive manufacturing technology,enables the development of high-performance structures with both load-bearing and thermally insulating capabilities.展开更多
Excessive Fe^(3+) ion concentrations in wastewater pose a long-standing threat to human health.Achieving low-cost,high-efficiency quantification of Fe^(3+) ion concentration in unknown solutions can guide environmenta...Excessive Fe^(3+) ion concentrations in wastewater pose a long-standing threat to human health.Achieving low-cost,high-efficiency quantification of Fe^(3+) ion concentration in unknown solutions can guide environmental management decisions and optimize water treatment processes.In this study,by leveraging the rapid,real-time detection capabilities of nanopores and the specific chemical binding affinity of tannic acid to Fe^(3+),a linear relationship between the ion current and Fe^(3+) ion concentration was established.Utilizing this linear relationship,quantification of Fe^(3+) ion concentration in unknown solutions was achieved.Furthermore,ethylenediaminetetraacetic acid disodium salt was employed to displace Fe^(3+) from the nanopores,allowing them to be restored to their initial conditions and reused for Fe^(3+) ion quantification.The reusable bioinspired nanopores remain functional over 330 days of storage.This recycling capability and the long-term stability of the nanopores contribute to a significant reduction in costs.This study provides a strategy for the quantification of unknown Fe^(3+) concentration using nanopores,with potential applications in environmental assessment,health monitoring,and so forth.展开更多
This work proposes a bioinspired hierarchical actuation strategy based on liquid crystal elastomers(LCEs),inspired by the helical topological dynamic adaptation mechanism of plant tendrils,to overcome the bottleneck o...This work proposes a bioinspired hierarchical actuation strategy based on liquid crystal elastomers(LCEs),inspired by the helical topological dynamic adaptation mechanism of plant tendrils,to overcome the bottleneck of precise anisotropic control in LCEs.Mechanically pre-programmed hierarchical LCE structures responsive to near-infrared(NIR)light were fabricated:the oriented constrained actuator achieves asymmetric contraction under NIR irradiation,enabling reversible switching between helix and planar morphologies with multi-terrain grasping capability;the biomimetic vine-like helical actuator,composed of Ag nanowire photothermal layers combined with helical LCE,utilizes temperaturegradient-induced phase transition wave propagation to achieve NIR-controlled climbing motion;the M?bius topology actuator realizes reversible deformation or self-locking states by tuning the twist angle(180°/360°);based on these,a bioinspired koala-like concentric soft robot was constructed,successfully demonstrating tree trunk climbing.This study reveals that artificial helical stretching significantly enhances the molecular chain orientation of LCEs(surpassing uniaxial stretching),reaching up to 1000%pre-strain,and the Ag NWs/LCE/PI(Polyimide)tri-layer structure achieves efficient photothermal-mechanical energy conversion via localized surface plasmon resonance(LSPR).This study provides a new paradigm for soft robotics material design and topological programming,demonstrating the potential for remote operation and adaptive grasping.展开更多
With the major developments that occurred during the past 40 years in the geotechnical engineering field,the usage of reinforcements in soils has been very common to improve the ultimate bearing capacity and reduce th...With the major developments that occurred during the past 40 years in the geotechnical engineering field,the usage of reinforcements in soils has been very common to improve the ultimate bearing capacity and reduce the footing settlements.These reinforcements consist of geogrids,geotextiles,geocells,etc.,all of which are in the geosynthetic family.Among these geosynthetic families,geocell performs better in soil-reinforced beds.In this study,we proposed the nine types of bioinspired geocells to improve the soil beds.For this purpose,a total of twenty numerical models were calculated via FLAC3D after validating the la-boratory model tests in the literature.The numerical results demonstrated that,except for the circular type,the performance of other geocell forms regarding increased bearing capacity was nearly identical.Regarding diffusion angles,only the circular and honeycomb geocells exhibited larger diffusion angles.The opening pocket diameter more significantly influenced the stress and strain of geocells.Geocells with nearly circular shapes,such as circular,honeycomb,hexagonal,and square,typically demonstrated higher confining stresses within the geocell walls.Conversely,for shapes that deviate from the circular form,such as dia-mond,re-entrant,and double V-shaped designs,the irregularity of the pocket shape could cause an uneven distribution of confining stresses,potentially leading to higher normal deformations at some specific areas and stress concentration at the wall joints.展开更多
Inspired by the structural adaptations of natural biological organisms,helicoidal composite architectures have shown significant potential for enhancing toughness,strength,and weight efficiency in engineering applicat...Inspired by the structural adaptations of natural biological organisms,helicoidal composite architectures have shown significant potential for enhancing toughness,strength,and weight efficiency in engineering applications.However,temperature and moisture's adverse effects pose challenges during service,potentially compromising their overall performance.This study meticulously analyzes the buckling and vibration behavior of carbon nanotube(CNT)-reinforced bioinspired helicoidal composite plates under different hygrothermal conditions.A novel aspect of this study lies in the proposition of a multiscale analysis combining the analytical and numerical techniques to assess the effects of temperature,moisture,weight fraction of CNTs,layup configurations of bioinspired designs,aspect ratios,loading and boundary conditions,and geometric shapes of bioinspired helicoidal composite structures on their vibration and buckling characteristics.In this context,the stiffness properties are computed with the Halpin-Tsai model,incorporating the size-dependent features of CNTs along with their waviness and agglomeration.In addition,the Chamis micro-mechanical equations are used to determine the elastic properties of individual layers constituting bioinspired composites,considering the effects of temperature and moisture.The kinematics of the laminated bioinspired structures are captured with the third-order shear deformation theory(TSDT)within the isogeometric framework employing the non-uniform rational B-splines(NURBSs)as the basis functions.The isogeometric framework ensures higher-order inter-element continuity and provides an exact geometric representation,offering various advantages over the traditional finite element method.The developed framework is validated against the existing literature,and thereafter several numerical examples are presented,providing valuable insights for the design and optimization of bioinspired composite structures,with potential benefits for various engineering fields,including marine and aerospace sectors.展开更多
Surgical electrodes are frequently associated with disadvantages such as high surface adhesion and severe thermal damage to adjacent normal tissues,which threaten operation quality and patient safety.In this study,by ...Surgical electrodes are frequently associated with disadvantages such as high surface adhesion and severe thermal damage to adjacent normal tissues,which threaten operation quality and patient safety.In this study,by mimicking the micromorphology and bio-anti-adhesion of shark skin,we proposed a strategy that utilized nanoscale aluminium oxide(Al_(2)O_(3))films deposited on bioinspired shark skin(BSS)microstructures to design a composite surface(Al_(2)O_(3)@BSS)and integrated it into both flat sides of the surgical electrodes.Micro/nano-manufacturing of the Al_(2)O_(3)@BSS surface was sequentially accomplished using nanosecond laser texturing,atomic layer deposition,and low-temperature annealing,endowing it with excellent blood-repellent properties.Visualisation experiments revealed that the tensile stress gradient of the blood coagulum with increasing thickness under a thermal field prompted it to separate from the Al_(2)O_(3)@BSS surface,resulting in anti-adhesion.Furthermore,it was observed for the first time that Al_(2)O_(3) films could transiently excite discharge along a dielectric surface(DADS)to ablate tissues while suppressing Joule heat,thereby minimising thermal damage.A combination of ex vivo tissue and living mouse experiments demonstrated that the Al_(2)O_(3)@BSS electrodes exhibited optimal comprehensive performance in terms of anti-adhesion,damage minimisation,and drag reduction.In addition,the Al_(2)O_(3)@BSS electrodes possessed remarkable antibacterial efficacy against E.coli and S.aureus.The proposed strategy can meet the extreme application requirements of surgical electrodes to improve operation quality and offer valuable insights for future studies.展开更多
Serving as the initiating explosive devices between the propellant tank and the engines,metal-based rupture diaphragms are widely used in ramjet igniters owing to the advantages provided by their simple structure,smal...Serving as the initiating explosive devices between the propellant tank and the engines,metal-based rupture diaphragms are widely used in ramjet igniters owing to the advantages provided by their simple structure,small size,and low cost.However,the reliability of rupture pressure directly affects the success of engine ignition and rocket launch,which is mainly influenced by factors like material,structure,and residual thickness of the surface notch of the diaphragm.Among those,the geometry of the notch is easy to define and control when compared to the mechanical parameters of the ruptured diaphragm.Thus,to make the diaphragm rupture(1A30 Al)within the required pressure range(0.4 MPa±3.5%)with highly sensitive and reliability,we draw inspiration from the arthropod’s force-sensitive slit organ which encompasses curved microgrooves to design a Ω-shaped notch for the rupture diaphragm.Finite element analysis is used to study the relationship between the burst pressure and geometric dimension of theΩ-shaped and bioinspired microgroove.Based on that,metal-based rupture diaphragms are fabricated by femtosecond laser processing technology,followed by rupture tests.Experiment results demonstrate that the practical rupture pressure of the diaphragm is highly consistent with the finite element analysis results,which verifies the effectiveness of the bionic design.展开更多
The preparation of superhydrophobic or underwater superoleophobic interface materials has become a research hotspot because of their wide application in self-cleaning, drag reduction, oil-water separation, anti-oil po...The preparation of superhydrophobic or underwater superoleophobic interface materials has become a research hotspot because of their wide application in self-cleaning, drag reduction, oil-water separation, anti-oil pollution and so on. The unique wettability of organisms gives inspiration to design and create new interface materials. This review focuses on the recent research progress of femtosecond laser micro/nano fabrication for bioinspired superhydrophobic or underwater superoleophobic surfaces. This review starts with a presentation of the related background including the advantages of femtosecond laser and wettability theoretical basis. Then, organisms with unique wettability in nature, the preparation of superhydrophobic or underwater superoleophobic surfaces by femtosecond lasers on different materials, and their related important applications are introduced. Finally, the current challenges and future prospects with regard to this field are provided.展开更多
This paper presents numerical investigations into a ridged surface whose design is inspired by the geometry of a Farrer’sscallop.The objective of the performed research is to assess if the proposed Bioinspired Ridged...This paper presents numerical investigations into a ridged surface whose design is inspired by the geometry of a Farrer’sscallop.The objective of the performed research is to assess if the proposed Bioinspired Ridged Surface (BRS) can potentiallyimprove wear resistance of soil-engaging components used in agricultural machinery and to validate numerical simulationsperformed using software based on the Discrete Element Method (DEM).The wear performance of the BRS is experimentallydetermined and also compared with a conventional flat surface.Different size of soil particles and relative velocities between theabrasive sand and the testing surfaces are used.Comparative results show that the numerical simulations are in agreement withthe experimental results and support the hypothesis that abrasive wear is greatly reduced by substituting a conventional flatsurface with the BRS.展开更多
Hydrogels with multifunctionalities,including sufficient bonding strength,injectability and self-healing capacity,responsive-adhesive ability,fault-tolerant and repeated tissue adhesion,are urgently demanded for invas...Hydrogels with multifunctionalities,including sufficient bonding strength,injectability and self-healing capacity,responsive-adhesive ability,fault-tolerant and repeated tissue adhesion,are urgently demanded for invasive wound closure and wound healing.Motivated by the adhesive mechanism of mussel and brown algae,bioinspired dynamic bonds cross-linked multifunctional hydrogel adhesive is designed based on sodium alginate(SA),gelatin(GT)and protocatechualdehyde,with ferric ions added,for sutureless post-wound-closure.The dynamic hydrogel cross-linked through Schiff base bond,catechol-Fe coordinate bond and the strong interaction between GT with temperature-dependent phase transition and SA,endows the resulting hydrogel with sufficient mechanical and adhesive strength for efficient wound closure,injectability and self-healing capacity,and repeated closure of reopened wounds.Moreover,the temperature-dependent adhesive properties endowed mispositioning hydrogel to be removed/repositioned,which is conducive for the fault-tolerant adhesion of the hydrogel adhesives during surgery.Besides,the hydrogels present good biocompatibility,near-infrared-assisted photothermal antibacterial activity,antioxidation and repeated thermo-responsive reversible adhesion and good hemostatic effect.The in vivo incision closure evaluation demonstrated their capability to promote the post-wound-closure and wound healing of the incisions,indicating that the developed reversible adhesive hydrogel dressing could serve as versatile tissue sealant.展开更多
基金funded by the National Natural Science Foundation of China(Grant Nos.62322410,52272168,624B2135,61804047)the Fundamental Research Funds for the Central Universities(No.WK2030000103)。
文摘Human action recognition(HAR)is crucial for the development of efficient computer vision,where bioinspired neuromorphic perception visual systems have emerged as a vital solution to address transmission bottlenecks across sensor-processor interfaces.However,the absence of interactions among versatile biomimicking functionalities within a single device,which was developed for specific vision tasks,restricts the computational capacity,practicality,and scalability of in-sensor vision computing.Here,we propose a bioinspired vision sensor composed of a Ga N/Al N-based ultrathin quantum-disks-in-nanowires(QD-NWs)array to mimic not only Parvo cells for high-contrast vision and Magno cells for dynamic vision in the human retina but also the synergistic activity between the two cells for in-sensor vision computing.By simply tuning the applied bias voltage on each QD-NW-array-based pixel,we achieve two biosimilar photoresponse characteristics with slow and fast reactions to light stimuli that enhance the in-sensor image quality and HAR efficiency,respectively.Strikingly,the interplay and synergistic interaction of the two photoresponse modes within a single device markedly increased the HAR recognition accuracy from 51.4%to 81.4%owing to the integrated artificial vision system.The demonstration of an intelligent vision sensor offers a promising device platform for the development of highly efficient HAR systems and future smart optoelectronics.
基金the National Natural Science Foundation of China(Grant No.52203037,52103031,and 52073107)the Natural Science Foundation of Hubei Province of China(Grant No.2022CFB649)the National Key Research and Development Program of China(Grant No.2022YFC3901902).
文摘Liquid leakage of pipeline networks not only results in considerableresource wastage but also leads to environmental pollution and ecological imbalance.In response to this global issue, a bioinspired superhydrophobic thermoplastic polyurethane/carbon nanotubes/graphene nanosheets flexible strain sensor (TCGS) hasbeen developed using a combination of micro-extrusion compression molding andsurface modification for real-time wireless detection of liquid leakage. The TCGSutilizes the synergistic effects of Archimedean spiral crack arrays and micropores,which are inspired by the remarkable sensory capabilities of scorpions. This designachieves a sensitivity of 218.13 at a strain of 2%, which is an increase of 4300%. Additionally, it demonstrates exceptional durability bywithstanding over 5000 usage cycles. The robust superhydrophobicity of the TCGS significantly enhances sensitivity and stability indetecting small-scale liquid leakage, enabling precise monitoring of liquid leakage across a wide range of sizes, velocities, and compositionswhile issuing prompt alerts. This provides critical early warnings for both industrial pipelines and potential liquid leakage scenariosin everyday life. The development and utilization of bioinspired ultrasensitive flexible strain sensors offer an innovative and effectivesolution for the early wireless detection of liquid leakage.
基金supported by National Natural Science Foundation of China(52373119,52475310)the National Key R&D Program of China(2022YFB4701000).
文摘Bioinspired superhydrophobic surfaces have been used for drag reduction.However,the secondary structures and the air cushions on these surfaces could be destructed in a flow,losing the effect of drag reduction.Here,a stainless-steel surface with mushroom-like cross-section(SMC)and diamond cavities(SMCD)having a drag reduction rate up to 19.37%is developed by 3D printing.The concealed re-entrant structures in SMCD prevent the infiltration of water into the chamber and form gas cushions,which converts the sliding friction at liquid-solid interface into rolling friction at liquid-gas interface,realizing the drag reduction.Meanwhile,98.3%of air can be maintained in the chamber in a flow with Reynolds number(Re)of 9×10^(5),ensuring the drag reduction in a high-velocity flow.Moreover,the continuous top stainless-steel surface and the supporting mesh network protect the critical re-entrant structures,ensuring the robustness of SMC.With the bioinspired design and one-step additive manufacturing process,SMC holds great potential for large-area production and applications requiring robust drag reduction.
文摘The field of photocatalysis has witnessed a significant advancement in the development of bioinspired and biomimetic photocatalysts for various biomedical applications,including drug delivery,tissue engineering,cancer therapy,and bioimaging.Nature has evolved efficient light-harvesting systems and energy conversion mechanisms,which serve as a benchmark for researchers.However,reproducing such complexity and harnessing it for biomedical applications is a daunting task.It requires a comprehensive understanding of the underlying biological processes and the ability to replicate them synthetically.By utilizing light energy,these photocatalysts can trigger specific chemical reactions,leading to targeted drug release,enhanced tissue regeneration,and precise imaging of biological structures.In this context,addressing the stability,long-term performance,scalability,and costeffectiveness of these materials is crucial for their widespread implementation in biomedical applications.While challenges such as complexity and stability persist,their advantages such as targeted drug delivery and personalized medicine make them a fascinating area of research.The purpose of this review is to provide a comprehensive analysis and evaluation of existing research,highlighting the advancements,current challenges,advantages,limitations,and future prospects of bioinspired and biomimetic photocatalysts in biomedicine.
基金financial support through the National Science Foundation of China(No.52305317)the research collaboration project between the National Natural Science Foundation of China and the National Research Foundation of Korea(No.W2412095)+1 种基金Natural Science Foundation of Shandong Province(No.ZR2022QB040,ZR2022QH006,ZR20230B113)the Youth Innovation Team of Shandong Province(2024KJH045).
文摘The advent of antibiotics revolutionized the management of bacterial infections,yet their clinical efficacy is catastrophically undermined by the global emergence of antimicrobial resistance(AMR).Furthermore,the situation is aggravated by the fact that the formation of bacterial biofilm on material surfaces significantly enhances their tolerance to antibiotics.Therefore,there is an urgent need for new approaches that employ antibacterial mechanisms distinct from those of conventional antibiotics to mitigate the risk of AMR.Recently,naturally occurring surfaces found on typical plants and insects that take advantage of physical topography can either inhibit bacterial adhesion or directly inactivate bacterial cells,showing innovative“outside-the-box”prospects for antibacterial applications and garnering considerable interest due to their drug-free nature.Bioinspired micro-/nanostructures that mimic natural surface patterns have been replicated on various biomaterials to enhance their antibacterial properties.This review summarizes and explains the current advances in bioinspired antibacterial surfaces,as well as the underlying mechanisms of various strategies.Subsequently,synergistic antimicrobial surfaces,comprising a combination of various physical antibacterial strategies,are reviewed to highlight their potential for highly efficient disinfection and long-lasting antibacterial performance.Finally,the biomedical applications,coupled with the future challenges of bio-inspired antibacterial strategies,were further discussed.We hope this review could provide valuable insights for developing innovative,antibiotic-free antibacterial strategies that deliver powerful performance in combating AMR.
基金supported by National Natural Science Foundation of China(Nos.22376057,22174048,22274048,22274045,22274047,and 21904039)the Foundation of the Science&Technology Department of Hunan Province(Nos.2023JJ30394 and2023ZJ1123)。
文摘Rapid and robust identification of bacteria is crucial for environmental monitoring and clinical diagnosis.Herein,a bioinspired interface-mediated multichannel sensor array was developed based on three-coloremitting antimicrobial functional carbon dots(FCDs)and concanavalin A doped polydopamine nanoparticles(Con A-PDA)for identification of bacteria.In this sensor,the fluorescence intensity of the three FCDs was quenched by the Con A-PDA.Upon addition different types of bacteria,the fluorescence intensity of the three FCDs was restored or further quenched.Recur to statistical analysis methods,it is employed to accurately discriminate 10 types of bacteria(including three probiotics and seven pathogenic bacteria)in natural water samples and human urine samples.The discrimination ability of the sensor array was highly enhanced via different competing binding of the FCDs and the bacteria toward Con A-PDA.The proposed array-based method offers a rapid,high-throughput,and reliable sensing platform for pathogen diagnosis in the field of environmental monitoring and clinical diagnosis.
基金supported by the National Key R&D Program of China(No.2023YFB4705600)the National Natural Science Foundation of China(Nos.U23A20342,62273331,61925307,and 61821005)+1 种基金the CAS Project for Young Scientists in Basic Research(No.YSBR-036)the CAS/SAFEA International Partnership Program for Creative Research Teams.
文摘Treatment of intracranial gliomas has increasingly favored minimally invasive surgery,with a growing focus on leveraging microrobots for efficient drug delivery while overcoming the impact of body fluids.Inspired by honeybee stingers,this study proposed a novel microspike robot.This robot firmly adhered to the tissue surface,enabling direct drug delivery from a hydrogel on its back into the targeted tissue via microspikes.The drug delivery rate was influenced by temperature and could be controlled by an alternating magnetic field.Microrobots could be delivered rapidly through a clinical Ommaya reservoir into the postoperative cavity or ventricle of the skull.The microrobot could be actuated for adhesion and retrieval,with its motion posture and trajectory highly precisely controlled by external magnetic fields.Biological experiments confirmed the excellent biocompatibility and biosafety of the microspike robot and demonstrated its effectiveness in treating gliomas by loading unconventional therapeutic drugs.The proposed microspike robot has significant potential for long-term drug delivery to target gliomas and other future clinical applications.
基金supported by the National Natural Science Foundation of China(52276099,52406219)Graduate Research and Innovation Foundation of Chongqing,China(CYB23034)+2 种基金China Scholarship Council(202406050113)the Australian Research Council(DE230100327)DCCEEW International Clean Innovation Researcher Networks Grant(ICIRN000011)。
文摘Photothermal catalysis utilizing the full solar spectrum to convert CO_(2)and H2O into valuable products holds promise for sustainable energy solutions.However,a major challenge remains in enhancing the photothermal conversion efficiency and carrier mobility of semiconductors like Bi_(2)MoO_(6),which restricts their catalytic performance.Here,we developed a facile strategy to synthesize vertically grown Bi_(2)MoO_(6)(BMO)nanosheets that mimic a bionic butterfly wing scale structure on a biomass-derived carbon framework(BCF).BCF/BMO exhibits high catalytic activity,achieving a CO yield of 165μmol/(g·h),which is an increase of eight times compared to pristine BMO.The wing scale structured BCF/BMO minimizes sunlight reflection and increases the photothermal conversion temperature.BCF consists of crystalline carbon(sp^(2)-C region)dispersed within amorphous carbon(sp^(3)-C hybridized regions),where the crystalline carbon forms“nano-islands”.The N-C-O-Bi covalent bonds at the S-scheme heterojunction interface of BCF/BMO function as electron bridges,connecting the sp^(2)-C nano-islands and enhancing the multilevel built-in electric field and directional trans-interface transport of carriers.As evidenced by DFT calculation,the rich pyridinic-N on the carbon nano-island can establish strong electron coupling with CO_(2),thereby accelerating the cleavage of*COOH and facilitating the formation of CO.Biomass waste-derived carbon nano-islands represent advanced amorphous/crystalline phase materials and offer a simple and low-cost strategy to facilitate carrier migration.This study provides deep insights into carrier migration in photocatalysis and offers guidance for designing efficient heterojunctions inspired by biological systems.
基金supported by National Key Research and Development Program of China(Grant No.2021YFB1715400)National Natural Science Foundation of China(Grant No.52225503)+3 种基金Key Research and Development Program of Jiangsu Province(Grant Nos.BE2022069,BE2022069-1)Fundamental Research Funds for the Central Universities(Grant No.NI2024003)National Natural Science Foundation of China for Creative Research Groups(Grant No.51921003)the 15th Batch of“Six Talents Peaks”Innovative Talents Team Program(Grant No.TD-GDZB-001).
文摘After millions of years of natural evolution,horsetails have evolved unique stem structures that enable survival in harsh environments.Inspired by the cross-sectional characteristics of horsetail stems,a series of bioinspired sandwich structures were designed and fabricated using the laser powder bed fusion(LPBF)process.By combining experimental and finite element simulation methods,the formability,mechanical properties,deformation behavior,and thermal conduction performance of these structures were determined.Results show that the surface morphology of the bioinspired sandwich structures was smooth,with no cracks observed.The bioinspired sandwich structure with an inner tube diameter of 1.9 mm(D_(1.9))exhibited optimal comprehensive mechanical properties,with a specific strength of 64.2 MPa/(g/cm^(3)),and specific energy absorption of 3.3 J/g.Stress distribution results revealed that the D_(1.9)structures had the most uniform stress distribution.Furthermore,increasing the internal conduction paths improved heat transfer;therefore,the thermal conductivities of the D_(1.4),D_(1.9),and D_(2.4)structures were higher than that of the D0 structure.This study demonstrates that a bioinspired design approach,combined with additive manufacturing technology,enables the development of high-performance structures with both load-bearing and thermally insulating capabilities.
基金supported by the National Natural Science Foundation of China(Nos.52303380,52025132,52273305,22205185,21621091,22021001,and 22121001)Fundamental Research Funds for the Central Universities(No.20720240041)+3 种基金the 111 Project(Nos.B17027 and B16029)the National Science Foundation of Fujian Province of China(No.2022J02059)the Science and Technology Projects of Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(No.RD2022070601)the New Cornerstone Science Foundation through the XPLORER PRIZE。
文摘Excessive Fe^(3+) ion concentrations in wastewater pose a long-standing threat to human health.Achieving low-cost,high-efficiency quantification of Fe^(3+) ion concentration in unknown solutions can guide environmental management decisions and optimize water treatment processes.In this study,by leveraging the rapid,real-time detection capabilities of nanopores and the specific chemical binding affinity of tannic acid to Fe^(3+),a linear relationship between the ion current and Fe^(3+) ion concentration was established.Utilizing this linear relationship,quantification of Fe^(3+) ion concentration in unknown solutions was achieved.Furthermore,ethylenediaminetetraacetic acid disodium salt was employed to displace Fe^(3+) from the nanopores,allowing them to be restored to their initial conditions and reused for Fe^(3+) ion quantification.The reusable bioinspired nanopores remain functional over 330 days of storage.This recycling capability and the long-term stability of the nanopores contribute to a significant reduction in costs.This study provides a strategy for the quantification of unknown Fe^(3+) concentration using nanopores,with potential applications in environmental assessment,health monitoring,and so forth.
基金financially supported by the National Natural Science Foundation of China(Nos.52275290 and 51905222)the Research Project of the State Key Laboratory of Mechanical System and Oscillation(No.MSV202419)+2 种基金Major Program of the National Natural Science Foundation of China for Basic Theory and Key Technology of Tri-Co Robots(No.92248301)Opening Project of the Key Laboratory of Bionic Engineering(Ministry of Education),Jilin University(No.KF2023006)Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.SJCX23_2091)。
文摘This work proposes a bioinspired hierarchical actuation strategy based on liquid crystal elastomers(LCEs),inspired by the helical topological dynamic adaptation mechanism of plant tendrils,to overcome the bottleneck of precise anisotropic control in LCEs.Mechanically pre-programmed hierarchical LCE structures responsive to near-infrared(NIR)light were fabricated:the oriented constrained actuator achieves asymmetric contraction under NIR irradiation,enabling reversible switching between helix and planar morphologies with multi-terrain grasping capability;the biomimetic vine-like helical actuator,composed of Ag nanowire photothermal layers combined with helical LCE,utilizes temperaturegradient-induced phase transition wave propagation to achieve NIR-controlled climbing motion;the M?bius topology actuator realizes reversible deformation or self-locking states by tuning the twist angle(180°/360°);based on these,a bioinspired koala-like concentric soft robot was constructed,successfully demonstrating tree trunk climbing.This study reveals that artificial helical stretching significantly enhances the molecular chain orientation of LCEs(surpassing uniaxial stretching),reaching up to 1000%pre-strain,and the Ag NWs/LCE/PI(Polyimide)tri-layer structure achieves efficient photothermal-mechanical energy conversion via localized surface plasmon resonance(LSPR).This study provides a new paradigm for soft robotics material design and topological programming,demonstrating the potential for remote operation and adaptive grasping.
基金financially supported by the Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences(No.SKLGME-JBGS2403)the National Natural Science Foundation of China(No.42477205)the Hubei Provincial Innovation Group Project(No.2023AFA019).
文摘With the major developments that occurred during the past 40 years in the geotechnical engineering field,the usage of reinforcements in soils has been very common to improve the ultimate bearing capacity and reduce the footing settlements.These reinforcements consist of geogrids,geotextiles,geocells,etc.,all of which are in the geosynthetic family.Among these geosynthetic families,geocell performs better in soil-reinforced beds.In this study,we proposed the nine types of bioinspired geocells to improve the soil beds.For this purpose,a total of twenty numerical models were calculated via FLAC3D after validating the la-boratory model tests in the literature.The numerical results demonstrated that,except for the circular type,the performance of other geocell forms regarding increased bearing capacity was nearly identical.Regarding diffusion angles,only the circular and honeycomb geocells exhibited larger diffusion angles.The opening pocket diameter more significantly influenced the stress and strain of geocells.Geocells with nearly circular shapes,such as circular,honeycomb,hexagonal,and square,typically demonstrated higher confining stresses within the geocell walls.Conversely,for shapes that deviate from the circular form,such as dia-mond,re-entrant,and double V-shaped designs,the irregularity of the pocket shape could cause an uneven distribution of confining stresses,potentially leading to higher normal deformations at some specific areas and stress concentration at the wall joints.
文摘Inspired by the structural adaptations of natural biological organisms,helicoidal composite architectures have shown significant potential for enhancing toughness,strength,and weight efficiency in engineering applications.However,temperature and moisture's adverse effects pose challenges during service,potentially compromising their overall performance.This study meticulously analyzes the buckling and vibration behavior of carbon nanotube(CNT)-reinforced bioinspired helicoidal composite plates under different hygrothermal conditions.A novel aspect of this study lies in the proposition of a multiscale analysis combining the analytical and numerical techniques to assess the effects of temperature,moisture,weight fraction of CNTs,layup configurations of bioinspired designs,aspect ratios,loading and boundary conditions,and geometric shapes of bioinspired helicoidal composite structures on their vibration and buckling characteristics.In this context,the stiffness properties are computed with the Halpin-Tsai model,incorporating the size-dependent features of CNTs along with their waviness and agglomeration.In addition,the Chamis micro-mechanical equations are used to determine the elastic properties of individual layers constituting bioinspired composites,considering the effects of temperature and moisture.The kinematics of the laminated bioinspired structures are captured with the third-order shear deformation theory(TSDT)within the isogeometric framework employing the non-uniform rational B-splines(NURBSs)as the basis functions.The isogeometric framework ensures higher-order inter-element continuity and provides an exact geometric representation,offering various advantages over the traditional finite element method.The developed framework is validated against the existing literature,and thereafter several numerical examples are presented,providing valuable insights for the design and optimization of bioinspired composite structures,with potential benefits for various engineering fields,including marine and aerospace sectors.
基金financially supported by the National Natural Science Foundation of China(Grant Nos.52275425,52405473,and 52405472)the Natural Science Foundation of Guangdong Province(Grant No.2024A1515010993)。
文摘Surgical electrodes are frequently associated with disadvantages such as high surface adhesion and severe thermal damage to adjacent normal tissues,which threaten operation quality and patient safety.In this study,by mimicking the micromorphology and bio-anti-adhesion of shark skin,we proposed a strategy that utilized nanoscale aluminium oxide(Al_(2)O_(3))films deposited on bioinspired shark skin(BSS)microstructures to design a composite surface(Al_(2)O_(3)@BSS)and integrated it into both flat sides of the surgical electrodes.Micro/nano-manufacturing of the Al_(2)O_(3)@BSS surface was sequentially accomplished using nanosecond laser texturing,atomic layer deposition,and low-temperature annealing,endowing it with excellent blood-repellent properties.Visualisation experiments revealed that the tensile stress gradient of the blood coagulum with increasing thickness under a thermal field prompted it to separate from the Al_(2)O_(3)@BSS surface,resulting in anti-adhesion.Furthermore,it was observed for the first time that Al_(2)O_(3) films could transiently excite discharge along a dielectric surface(DADS)to ablate tissues while suppressing Joule heat,thereby minimising thermal damage.A combination of ex vivo tissue and living mouse experiments demonstrated that the Al_(2)O_(3)@BSS electrodes exhibited optimal comprehensive performance in terms of anti-adhesion,damage minimisation,and drag reduction.In addition,the Al_(2)O_(3)@BSS electrodes possessed remarkable antibacterial efficacy against E.coli and S.aureus.The proposed strategy can meet the extreme application requirements of surgical electrodes to improve operation quality and offer valuable insights for future studies.
基金supported by the National Key R&D Program of China(Grant No.2022YFB4601700).
文摘Serving as the initiating explosive devices between the propellant tank and the engines,metal-based rupture diaphragms are widely used in ramjet igniters owing to the advantages provided by their simple structure,small size,and low cost.However,the reliability of rupture pressure directly affects the success of engine ignition and rocket launch,which is mainly influenced by factors like material,structure,and residual thickness of the surface notch of the diaphragm.Among those,the geometry of the notch is easy to define and control when compared to the mechanical parameters of the ruptured diaphragm.Thus,to make the diaphragm rupture(1A30 Al)within the required pressure range(0.4 MPa±3.5%)with highly sensitive and reliability,we draw inspiration from the arthropod’s force-sensitive slit organ which encompasses curved microgrooves to design a Ω-shaped notch for the rupture diaphragm.Finite element analysis is used to study the relationship between the burst pressure and geometric dimension of theΩ-shaped and bioinspired microgroove.Based on that,metal-based rupture diaphragms are fabricated by femtosecond laser processing technology,followed by rupture tests.Experiment results demonstrate that the practical rupture pressure of the diaphragm is highly consistent with the finite element analysis results,which verifies the effectiveness of the bionic design.
基金Projects(52075557,51805553) supported by the National Natural Science Foundation of ChinaProject(ZZYJKT2019-12) supported by the Project of State Key Laboratory of High Performance Complex Manufacturing,China。
文摘The preparation of superhydrophobic or underwater superoleophobic interface materials has become a research hotspot because of their wide application in self-cleaning, drag reduction, oil-water separation, anti-oil pollution and so on. The unique wettability of organisms gives inspiration to design and create new interface materials. This review focuses on the recent research progress of femtosecond laser micro/nano fabrication for bioinspired superhydrophobic or underwater superoleophobic surfaces. This review starts with a presentation of the related background including the advantages of femtosecond laser and wettability theoretical basis. Then, organisms with unique wettability in nature, the preparation of superhydrophobic or underwater superoleophobic surfaces by femtosecond lasers on different materials, and their related important applications are introduced. Finally, the current challenges and future prospects with regard to this field are provided.
基金supported by the National High Technology Research and Development Program of China(863 Program)(Grant No.2009AA043603-4,2009AA043604-2)by National Foundations of Agricultural Technological Transformation of China(Grant No.2009GB23600507)+1 种基金by National Natural Science Foundation of China(Grant No.50675087,50635030)by "985 Project" of Jilin University
文摘This paper presents numerical investigations into a ridged surface whose design is inspired by the geometry of a Farrer’sscallop.The objective of the performed research is to assess if the proposed Bioinspired Ridged Surface (BRS) can potentiallyimprove wear resistance of soil-engaging components used in agricultural machinery and to validate numerical simulationsperformed using software based on the Discrete Element Method (DEM).The wear performance of the BRS is experimentallydetermined and also compared with a conventional flat surface.Different size of soil particles and relative velocities between theabrasive sand and the testing surfaces are used.Comparative results show that the numerical simulations are in agreement withthe experimental results and support the hypothesis that abrasive wear is greatly reduced by substituting a conventional flatsurface with the BRS.
基金supported by the National Natural Science Foundation of China (No. 51973172)Natural Science Foundation of Shaanxi Province (Nos. 2020JC-03 and 2019TD-020)+2 种基金the State Key Laboratory for Mechanical Behavior of Materials,the World-Class Universities (Disciplines) and Characteristic Development Guidance Funds for the Central UniversitiesFundamental Research Funds for the Central Universitiesthe Opening Project of the Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research,College of Stomatology,Xi’an Jiaotong University (No. 2019LHM-KFKT008).
文摘Hydrogels with multifunctionalities,including sufficient bonding strength,injectability and self-healing capacity,responsive-adhesive ability,fault-tolerant and repeated tissue adhesion,are urgently demanded for invasive wound closure and wound healing.Motivated by the adhesive mechanism of mussel and brown algae,bioinspired dynamic bonds cross-linked multifunctional hydrogel adhesive is designed based on sodium alginate(SA),gelatin(GT)and protocatechualdehyde,with ferric ions added,for sutureless post-wound-closure.The dynamic hydrogel cross-linked through Schiff base bond,catechol-Fe coordinate bond and the strong interaction between GT with temperature-dependent phase transition and SA,endows the resulting hydrogel with sufficient mechanical and adhesive strength for efficient wound closure,injectability and self-healing capacity,and repeated closure of reopened wounds.Moreover,the temperature-dependent adhesive properties endowed mispositioning hydrogel to be removed/repositioned,which is conducive for the fault-tolerant adhesion of the hydrogel adhesives during surgery.Besides,the hydrogels present good biocompatibility,near-infrared-assisted photothermal antibacterial activity,antioxidation and repeated thermo-responsive reversible adhesion and good hemostatic effect.The in vivo incision closure evaluation demonstrated their capability to promote the post-wound-closure and wound healing of the incisions,indicating that the developed reversible adhesive hydrogel dressing could serve as versatile tissue sealant.
