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Bioinspired Actuation of Liquid Crystal Elastomers with Hierarchical Structures Based on Light Response 认领 引用 被引量：1
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作者 Li-Zhi Zhang Bo-Yu Liu +1 位作者 Chen Zhu Lin Xu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第11期1981-1990,I0007,共10页
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
关键词 Liquid crystal elastomers Bioinspired actuation Hierarchical structures Topological structures
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Enhanced photodegradation activity of ZnO:Eu3+and ZnO:Eu3+@Au 3D hierarchical structures 认领 引用 被引量：2
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作者 Nataliya Babayevska Igor Iatsunskyi +3 位作者 Patryk Florczak Marcin Jarek Barbara Peplińska Stefan Jurga 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第1期21-28,共8页
In this work the flower-like hierarchical structures(HS) based on 3 D pristine ZnO,ZnO:Eu^3+ and ZnO:Eu^3+ @Au were successfully obtained by a template-free solvothermal and deposition-precipitation method.The decolor... In this work the flower-like hierarchical structures(HS) based on 3 D pristine ZnO,ZnO:Eu^3+ and ZnO:Eu^3+ @Au were successfully obtained by a template-free solvothermal and deposition-precipitation method.The decolorization/photodegradation of these structures towards model organic dye(rhodamine 6 G) was studied.The synthesized ZnO-based HS were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),UV-vis and photoluminescence(PL) spectroscopies.The proposed synthesis approaches allow to obtain highly crystalline 3 D ZnO,ZnO:Eu^3+ and ZnO:Eu^3+ @Au composites.Results of scanning microscopy show that ZnO flower-like HS are assemblies from smaller components,forming larger ones,the whole ZnO structure was approximately 3 μm.Au nanoparticles(size^10 nm)are successfully deposited on ZnO HS surface.Luminescent studies show that ZnO is an ideal matrix for incorporation of Eu^3+ ions in broad concentration range(Eu^3+=1.0 at%-5.0 at%) with an efficient red luminescence.The strong UV emission in ZnO,as well as ZnO;Eu^3+HS is observed under 325 nm excitation.Doping of ZnO HS matrix by Eu^3+ions leads to the red shift of deep level emission peak(DLE).The PL intensity reaches the maximum up to 5 at% Eu^3+.The photocatalytic properties of ZnO and ZnO:Eu^3+ @Au HS were investigated under UV-Vis light irradiation towards rhodamine 6 G.The obtained results demonstrate the synergetic effect of the deposited gold nanoparticles and Eu3^+ doping on photocatalytic activity of ZnO:Eu^3+@Au HS in comparison to pristine ZnO and ZnO:Eu^3+ HS. 展开更多
关键词 Zinc oxide Hierarchical structures Europium Gold Photocatalysis Rhodamine 6G
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Hierarchical structures on platinum-iridium substrates enhancing conducting polymer adhesion 认领 引用 被引量：1
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作者 Linze Li Changqing Jiang Luming Li 《Bio-Design and Manufacturing》 SCIE EI CAS CSCD 2024年第6期889-898,共10页
Conducting polymers(CPs),including poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS),are promising coating materials for neural electrodes.However,the weak adhesion of CP coatings to substrates such a... Conducting polymers(CPs),including poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS),are promising coating materials for neural electrodes.However,the weak adhesion of CP coatings to substrates such as platinum-iridium is a significant challenge that limits their practical application.To address this issue,we used femtosecond laser-prepared hierarchical structures on platinum-iridium(Pt-Ir)substrates to enhance the adhesion of PEDOT:PSS coatings.Next,we used cyclic voltammetry(CV)stress and accelerated aging tests to evaluate the stability of both drop cast and electrodeposited PEDOT:PSS coatings on Pt-Ir substrates,both with and without hierarchical structures.Our results showed that after 2000 CV cycles or five weeks of aging at 60℃,the morphology and electrochemical properties of the coatings on the Pt-Ir substrates with hierarchical structures remained relatively stable.In contrast,we found that smooth Pt-Ir substrate surfaces caused delamination of the PEDOT:PSS coating and exhibited both decreased charge storage capacity and increased impedance.Overall,enhancing the stability of PEDOT:PSS coatings used on common platinum-iridium neural electrodes offers great potential for improving their electrochemical performance and developing new functionalities. 展开更多
关键词 Hierarchical structures Femtosecond laser Conducting polymers Neural electrodes Stability
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Wettability regulated gram-negative bacterial adhesion on biomimetic hierarchical structures 认领 引用 被引量：1
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作者 You Jiang Yi-Jie Yin +2 位作者 Xin-Cheng Zha Xiao-Qiu Dou Chuan-Liang Feng 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第4期813-817,共5页
One of the critical issues in gram-negative bacterial adhesion is how wettability regulates adhesion as the surface wettability varies from superhydrophilic to superhydrophobic,and what is the relevant/contributing ro... One of the critical issues in gram-negative bacterial adhesion is how wettability regulates adhesion as the surface wettability varies from superhydrophilic to superhydrophobic,and what is the relevant/contributing role of the lipopolysaccharide（LPS） outer layer of the gram-negative shell during this procedure.Herein,by avoiding the unexpected influence induced by the varied topographies,control over gram-negative bacteria adhesion by wettability is achieved on biomimetic hierarchical surfaces,which is mainly mediated by LPS layer.The study provides a methodology to have a good control over bacteria cell adhesion by properly designing wettable surface structures.This design concept is helpful for developing new generations of biomaterials in order to control a variety of diseases induced by gramnegative bacteria,which still continue to be very important and necessary in the fields of biomedicine. 展开更多
关键词 Wettability Gelator Self-assembly Hierarchical structures Bacteria adhesion
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Fabrication and efficient electromagnetic waves attenuation of three-dimensional porous reduced graphene oxide/boron nitride/silicon carbide hierarchical structures 认领 引用 被引量：4
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作者 Qiuqi Zhang Xiao You +5 位作者 Li Tian Mengmeng Wang Xiangyu Zhang Ying Shi Jinshan Yang Shaoming Dong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第24期192-201,共10页
In this work,hierarchical hybrid composites consisting of porous three-dimensional reduced graphene oxide(3D-rGO)skeleton and lamellar boron nitride(BN)/silicon carbide(SiC)coatings are prepared by chemical vapor infi... In this work,hierarchical hybrid composites consisting of porous three-dimensional reduced graphene oxide(3D-rGO)skeleton and lamellar boron nitride(BN)/silicon carbide(SiC)coatings are prepared by chemical vapor infiltration(CVI)process.The graphene framework prepared by 3D printing and frozen self-assembly exhibits a lightweight structure and a perforated conductive network,which extends the transmission path of incident microwaves.The introduced ceramic coatings can effectively tune the impedance matching degree and supply a lossy phase,and the hierarchical structure of the composites enhances the multiple scattering of the incident microwaves.As expected,the 3D-rGO/BN/SiC composites possess an excellent absorbing performance with a minimum reflection loss value of–37.8 dB,and the widest effective absorbing bandwidth(RL<–10 dB)of 5.90 GHz is obtained.The controllable fabrication of composites can provide a guideline for rational design and fabrication of high-performance electromagnetic waves absorbing materials in practical applications. 展开更多
关键词 Porous network structure Hierarchical structure Electromagnetic wave absorbing High attenuation ability Effective absorbing bandwidth
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NiO nanoparticles-decorated ZnO hierarchical structures for isopropanol gas sensing 认领 引用 被引量：4
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作者 Shi-Chao Wang Xiao-Hu Wang +5 位作者 Gao-Qun Qiao Xiao-Yan Chen Xin-Zhen Wang Nan-Nan Wu Jian Tian Hong-Zhi Cui 《Rare Metals》 SCIE EI CAS CSCD 2022年第3期960-971,共12页
In this paper,a three-dimensional(3D)hierar-chical ZnO structure consisting of nanosheets modified with ultrafine NiO particles was synthesized via a facile two-step chemical precipitate method.Various techniques char... In this paper,a three-dimensional(3D)hierar-chical ZnO structure consisting of nanosheets modified with ultrafine NiO particles was synthesized via a facile two-step chemical precipitate method.Various techniques characterized the as-synthesized ZnO/NiO composites and pure ZnO.The p-NiO-ZnO junctions formed between adjacent ZnO and NiO nanoparticles,improving the gas sensing performance.The ZnO/NiO composite with the Ni:Zn atomic ratio of 7.42:100 exhibited the best iso-propanol sensing properties.Compared to pure ZnO,it showed high selectivity and sensitivity(Ra/Rg=221.3 toward 400×10-6isopropanol),fast response rate(less than 10 s),short recovery time,and simultaneously low operating temperature.Also,the ZnO/NiO composite exhibited a wide sensing range(1×10-6-1000×10-6)to isopropanol and processed good long-term stability.The experimental results suggested the potential application in fabricating efficient isopropanol sensors using this ZnO/NiO composite.The enhanced isopropanol sensing mech-anism is also discussed in charge transfer between heterojunctions,surface area,and surface defects. 展开更多
关键词 ZnO NiO Hierarchical structure Gas sensor Isopropanol
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Role of Multi-scale Hierarchical Structures in Regulating Wetting State and Wetting Properties of Structured Surfaces 认领 引用 被引量：1
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作者 Yue Jiang Xinyi Li +5 位作者 Zhichao Ma Zhihui Zhang Cuie Wen Zhonghao Jiang Nan Lin Luquan Ren 《Journal of Bionic Engineering》 SCIE EI CSCD 2024年第3期1347-1359,共13页
Amplifying the intrinsic wettability of substrate material by changing the solid/liquid contact area is considered to be the main mechanism for controlling the wettability of rough or structured surfaces.Through theor... Amplifying the intrinsic wettability of substrate material by changing the solid/liquid contact area is considered to be the main mechanism for controlling the wettability of rough or structured surfaces.Through theoretical analysis and experimental exploration,we have found that in addition to this wettability structure amplification effect,the surface structure also simultaneously controls surface wettability by regulating the wetting state via changing the threshold Young angles of the Cassie-Baxter and Wenzel wetting regions.This wetting state regulation effect provides us with an alternative strategy to overcome the inherent limitation in surface chemistry by tailoring surface structure.The wetting state regulation effect created by multi-scale hierarchical structures is quite significant and plays is a crucial role in promoting the superhydrophobicity,superhydrophilicity and the transition between these two extreme wetting properties,as well as stabilizing the Cassie-Baxter superhydrophobic state on the fabricated lotus-like hierarchically structured Cu surface and the natural lotus leaf. 展开更多
关键词 Hierarchical structure Wetting state regulation Wetting transition Superhydrophobicity Superhydrophilicity
Fast net-forming of biomimetic hierarchical structures with robust oil/water separation performance 认领 引用
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作者 Jianan Fu Liangchi Zhang +1 位作者 Zhen Li Jiang Ma 《Microsystems & Nanoengineering》 SCIE EI CSCD 2026年第1期741-751,共11页
Biomimetic hierarchical structures(BHS)are a powerful strategy for engineering functional surfaces with exceptional properties.However,their practical application is limited by inefficient,costly and complex fabricati... Biomimetic hierarchical structures(BHS)are a powerful strategy for engineering functional surfaces with exceptional properties.However,their practical application is limited by inefficient,costly and complex fabrication methods.This study presents a novel net-forming approach for the efficient,scalable fabrication of BHS inspired by the microstructure of rice leaves.By optimizing the tool surface design,the process achieves an ultra-low material loss of just 0.008‰and a high processing efficiency of 18 mm2/s.The resulting BHS replicate the superhydrophobicity and anisotropic sliding behavior of rice leaves,while maintaining durable water repellency after more than 5000 hours of natural exposure and under severe abrasion.The method further offers substantial design flexibility,allowing the reconfiguration of BHS to accommodate diverse functions.This versatility is demonstrated by the fabrication of a mesh with BHS that exhibits efficient oil/water separation,achieving a separation efficiency of 99.07%,a flux of 2630 L·m-2·h-1and notable self-cleaning ability.This work introduces a creative and scalable pathway for multifunctional BHS fabrication,significantly expanding their potential for real-world applications. 展开更多
关键词 efficient fabrication oil water separation fabrication methodsthis optimizing tool surface designthe engineering functional surfaces bioinspired hierarchical structures superhydrophobicity rice leavesby
Slippery liquid-infused surface with micro/nano hierarchical structures:Highly efficient fog harvesting 认领 引用
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作者 Shiping He Ye Fu +2 位作者 Wenhao Zhang Zhiguang Guo Weimin Liu 《Friction》 SCIE EI CAS CSCD 2026年第1期47-56,共10页
The lack of freshwater resources is a global problem.Fast and efficient water capture from fog is a good solution for many organisms living in arid regions.Compared with superhydrophobic surfaces,slippery liquid-fille... The lack of freshwater resources is a global problem.Fast and efficient water capture from fog is a good solution for many organisms living in arid regions.Compared with superhydrophobic surfaces,slippery liquid-filled porous surfaces(SLIPS)exhibit excellent droplet transport and shedding properties with very low sliding angles(SAs).It is not easy to produce a water film which can effectively improve the efficiency of fog collection.The shape and size of the microanostructure are flexibly adjusted by laser etching,the nanowires on the micron-scale pillars and groove structure are uniformly covered by ammonia etching,and silicone oil is injected by spin-coating to obtain a slippery liquid-infused surface with a microanostructure.Under the synergistic effect of our constructed microanostructure,the superhydrophobic surface injected with lubricant exhibited efficient droplet capture,aggregation,and removal properties,which greatly improved the fog collection efficiency(107%higher than that of the original sample).More importantly,the surface has excellent stability,ice resistance,and acid/alkali resistance and is expected to be used in various extreme adjustments. 展开更多
关键词 slippery liquid-infused surface hierarchical structure laser etching fog harvesting
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Boosting multiple loss by hierarchical nano-architecture with manipulation of interfacial charge redistribution in Mott-Schottky heterostructures for enhanced electromagnetic absorption 认领 引用 被引量：2
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作者 Tong Liu Chong Wang +7 位作者 Hai Huang Haoyang Huo Miao Li Chenzhengzhe Yan Ge Zhang Hao Li Xingxing Zhang Wenhuan Huang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第20期66-75,共10页
The regulation of the interfacial electric field plays a pivotal role in magnifying the electromagnetic en-ergy attenuation capability during the design and synthesis of efficient and tunable absorbers for elec-tromag... The regulation of the interfacial electric field plays a pivotal role in magnifying the electromagnetic en-ergy attenuation capability during the design and synthesis of efficient and tunable absorbers for elec-tromagnetic waves(EMW).Herein,a rational and universally applicable two-step hydrothermal method strategy was proposed to effectively control the electronic structure of Mott-Schottky EMW absorbing materials derived from Co-MOF.The as-synthesized Co3S4@MoS2/NC ensures efficient electron transfer,while the change redistribution leads to the emergence of additional electric dipoles under an external EMM field.In addition,the hierarchical Co3S4@MoS2/NC nano-architecture with a hierarchical arrange-ment in 2D and 3D offers more polarization sites,thereby extending the path for EMW transmission through multiple reflections and scattering.The potential to enhance the EMW absorption performance of Co3S4@MoS2/NC lies in its unique microstructure and substantial surface area,which optimize impedance matching properties through a synergistic effect of dipole and interfacial polarization induced by Mott-Schottky heterointerfaces.As anticipated,the Co3S4@MoS2/NC exhibits a maximum EMW absorption ca-pacity with an RLmin value of-41.97 dB and a broad EAB of 4.24 GHz at a thickness of 2.0 mm.This study provides insights for designing highly efficient Mott-Schottky EMW absorbing materials at the molecular level rationally. 展开更多
关键词 Electromagnetic wave absorption Mott-Schottky heterostructures Multiple loss Hierarchical structures
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Advances in the contact mechanics theory and applications of biomimetic artificial adhesives inspired by biological multiscale hierarchical structures 认领 引用 被引量：1
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作者 Qian Cheng Feodor M.Borodich +2 位作者 Zaida Gao Stanislav N.Gorb Xiaoqing Jin 《Friction》 SCIE EI CAS CSCD 2025年第11期24-43,共20页
Living organisms,such as geckos and insects,exhibit excellent climbing ability on various complex surfaces due to the hair-like hierarchical adhesive systems of their attachment devices.Over the past few decades,an in... Living organisms,such as geckos and insects,exhibit excellent climbing ability on various complex surfaces due to the hair-like hierarchical adhesive systems of their attachment devices.Over the past few decades,an increased understanding of the mechanisms of multiscale hierarchical adhesion systems and the continual improvement of theoretical modeling have promoted the rapid advancement in the design and application of biomimetic artificial adhesives.The modeling of biomimetic artificial adhesives has developed from simple structures to complex constructions with multilevel hierarchical properties.A review of advances in the development of these contact mechanics models is presented here.Adhesion and friction models considering multiscale hierarchical structural forms are discussed,with a focus on multiscale hierarchical models based on the development of the Cantor‒Borodich profiles.Finally,the most recent developments in studies of artificial setae with spatula-like ends,both axisymmetric and non-axisymmetric,are reviewed. 展开更多
关键词 artificial adhesives adhesion friction multiscale hierarchical structure
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Understanding the Machining Process of Hierarchical Micro/Nanograting Structures Used for Optical Variable Device 认领 引用 被引量：1
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作者 Yanquan Geng Wenhan Zhu +5 位作者 Xiaosong Zhang Aoxiang Zhang Yongda Yan Hailong Cui Bo Xue Jiqiang Wang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2025年第1期161-185,共25页
Hierarchical microanograting structures have attracted increasing attention owing to their significant applications in the fields of structural coloring,anti-counterfeiting,and decoration.Thus,the fabrication of hiera... Hierarchical microanograting structures have attracted increasing attention owing to their significant applications in the fields of structural coloring,anti-counterfeiting,and decoration.Thus,the fabrication of hierarchical microanograting structures is important for these applications.In this study,a strategy for machining hierarchical microanograting structures is developed by controlling the tool movement trajectory.A coupling Euler-Lagrange finite element model is established to simulate the machining process.The effect of the machining methods on the nanograting formation is demonstrated,and a suitable machining method for reducing the cutting force is obtained.The height of the nanograting decreases with an increase in the tool edge radius.Furthermore,optical variable devices(OVDs)are machined using an array overlap machining approach.Coding schemes for the parallel column unit crossover and column unit in the groove crossover are designed to achieve high-quality machining of OVDs.The coloring of the logo of the Harbin Institute of Technology and the logo of the centennial anniversary of the Harbin Institute of Technology on the surface of metal samples,such as aluminum alloys,is realized.The findings of this study provide a method for the fabrication of hierarchical microanograting structures that can be used to prepare OVDs. 展开更多
关键词 Hierarchical microanograting structures Optical variable devices Finite element simulation Tool trajectory controlling
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Designing“Sphere/Network”Hierarchical Dielectric Loss Structure for Efficient Electromagnetic Wave Absorption 认领 引用
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作者 Yue Zhang Xin Yang +7 位作者 Yongwen Yang DingYuan Ma Wenjian Wang Qing Pang Changyi Zheng Weiping Ye Rui Zhao Weidong Xue 《Rare Metals》 SCIE EI CAS CSCD 2026年第6期360-370,共11页
Electromagnetic wave absorption materials require high dielectric loss and excellent impedance matching performance.However,current conventional biomass‐derived electromagnetic wave absorption materials are still lim... Electromagnetic wave absorption materials require high dielectric loss and excellent impedance matching performance.However,current conventional biomass‐derived electromagnetic wave absorption materials are still limited by low electrical conductivity and a single structure.In this work,a“sphereetwork”hierarchical attenuation electromagnetic wave absorption material,which combines weakly conductive biomass‐derived carbon spheres and highly conductive cantaloupe‐like textured polypyrrole,was synthesized using Fe3+and methyl orange as template‐directing agents.Under the guiding effect of methyl orange,polypyrrole does not undergo disordered agglomeration on the surface of carbon spheres;instead,tubular polypyrrole grows orderly along the sphere surface and assembles to form a continuous conductive network.Conduction loss,dipole polarization,and interfacial polarization loss-acting as cooperative loss mechanisms-enable OJ‐MO‐PPy‐2.5 to achieve broadband effective absorption,with an effective absorption bandwidth of 7.2 GHz and a minimum reflection loss of−48.82 dB.Meanwhile,computer simulation technology(CST)simulation results indicate that after coating OJ‐MO‐PPy‐2.5,the reflection intensity of the electromagnetic wave is reduced by approximately three times when the wave is incident normally.The successful fabrication of OJ‐MO‐PPy furnishes novel insights for biomass‐derived electromagnetic wave absorption materials with broadband absorption capabilities. 展开更多
关键词 biomass‐derived carbon dielectric loss electromagnetic wave absorption hierarchical structure polypyrrole
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Hierarchical VO2@BiVO4Films Decorated With Porous BiVO4Nanoplates for Durable and Self‐Cleaning Smart Windows 认领 引用
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作者 Huiyan Xu Lihan Cai +9 位作者 Jian Zhang Rui Chen Zaoyang Xu Mingyu Lu Xinyuan Xing Shuaijun Yang Tongyao Liu Yuanwei Sun Xuchuan Jiang Xin Yu 《Rare Metals》 SCIE EI CAS CSCD 2026年第6期443-453,共11页
VO2is a promising thermochromic material,but it is still limited by low transparency,weak solar modulation,and poor stability.Here,we develop a coordination‐compound‐derived strategy to construct a hierarchical B... VO2is a promising thermochromic material,but it is still limited by low transparency,weak solar modulation,and poor stability.Here,we develop a coordination‐compound‐derived strategy to construct a hierarchical BiVO4/VO2@BiVO4film with a core-shell@nanosheet structure.VO2@BiVO4nanoparticles form the inner layer,whereas porous BiVO4nanosheets assemble on the surface.This architecture provides synergistic benefits:The BiVO4shell protects VO2from oxidation and enhances plasmon‐induced solar modulation,and the nanosheets improve visible transparency via antireflection.The composite also exhibits photocatalytic self‐cleaning and antibacterial activity.It delivers 63.0%visible transmittance and 15.6%solar modulation,retaining 80%performance after 27 days at 100°C and 50%humidity.This work integrates optical performance,durability,and multifunctionality,offering a practical pathway for VO2‐based smart windows. 展开更多
关键词 BiVO4/VO2@BiVO4 hierarchical structure self‐cleaning s mart window thermochromism
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Hierarchically porous hollow architecture hosting dense Co/Fe single-atom sites for synergistic oxygen electrocatalysis 认领 引用
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作者 Le Wei Xuetao Zhang +8 位作者 Zhanyong Xu Xingyi Shu Hongbo Lou Fujun Lan Songqi Gu Ge Chen Qiaoshi Zeng Manling Sui Xiaoxing Ke 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第5期854-862,I0020,共9页
Tailoring single-atom catalysts(SACs)is a never-ending topic for catalyst design,where support modification plays a pivotal role.The support is conventionally porous,targeted to host high-density single atoms and to a... Tailoring single-atom catalysts(SACs)is a never-ending topic for catalyst design,where support modification plays a pivotal role.The support is conventionally porous,targeted to host high-density single atoms and to allow effective mass transfer,particularly for electrochemical reactions.However,a suboptimal porous structure with low connectivity and closed pores,may negatively impact the electrochemical performance.Introducing cavity to hierarchical porous structures has recently emerged as a promising approach,but the synthesis often relies on etchants which are usually destructive,whereas the impact of hierarchical shell on electrocatalytic activity lacks detailed investigations.In this work,we propose a“MOF-on-MOF”strategyby constructing high-density Co/Fe dual single-atom catalysts with hierarchical porosity and hollow structure through one-step annealing.This approach simultaneously achieves active sites with dense Co/Fe sites and optimizes support architecture,enabling efficient reaction kinetics for oxygen reduction reactions(ORR)/oxygen evolution reactions(OER).The optimal Co_8Fe2-N/C-900℃catalyst demonstrates outstanding bifunctional activity in alkaline media.Density functional theory(DFT)calculations reveal that the Co sites exhibit favorable adsorption of reaction intermediates,and the Fe sites boast a lower energy barrier,which is ensured by high-density Co/Fe dual atom sites through our approach.This work establishes a new route to SACs derived from ZIFs,offering a novel solution for the field. 展开更多
关键词 MOF-on-MOF Single-atom catalysts Bifunctional catalysts 3D electron tomography Hierarchical hollow structure
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Fuel to fire:developmental niche-empowered ApoEVs unlock adult hierarchical tissue regenerative potential via mitochondrial complexⅠ-driven developmental metabolic profile 认领 引用
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作者 Yanshu Zhang Jieyun Xu +10 位作者 Yuhan Shi Yihua Cai Mixiao Gui Junlong Xue Xuan Zhou Ziqiong Qin Hongcheng Chen Guanqi Liu Songtao Shi Xueli Mao Zetao Chen 《International Journal of Oral Science》 SCIE CAS CSCD 2026年第3期442-458,共17页
Organ defects involving hierarchical tissue structures remain a major challenge due to limited regenerative capacity in adulthood.To break this bottleneck,regenerative medicine is undergoing a paradigm shift from simu... Organ defects involving hierarchical tissue structures remain a major challenge due to limited regenerative capacity in adulthood.To break this bottleneck,regenerative medicine is undergoing a paradigm shift from simulating the healing process of mature organs to reactivating re-development potential,namely developmental engineering strategy.In this study,we propose a novel paradigm based on developmental niche-empowered stem cell-derived apoptotic extracellular vesicles(DevNiche-ApoEVs),which integrates cues from both parental stem cells and their environmental niches.Using the periodontium as a classical hierarchical model,we identified developmental M2-phenotype macrophages(DevM2φ)as a key niche component that induces a developmental metabolic profile in stem cells,characterized by enhanced energy metabolism,mitochondrial homeostasis,and dominance of oxidative phosphorylation.We subsequently empowered ApoEVs with DevM2φ-mediated developmental niche to generate DevNiche-ApoEVs capable of delivering mitochondrial complex I and recapitulating the developmental metabolic profile.In vitro studies confirmed DevNiche-ApoEVs reactivated the developmental potential of adult periodontal ligament cells(PDLCs),while complex I inhibition abrogated this effect.Consistently,DevNiche-ApoEVs promoted re-development-based hierarchical periodontal regeneration by recapitulating critical developmental events in vivo.This study highlights the pivotal role of the developmental niche in hierarchical tissue regeneration and provides a promising DevNiche-ApoEVs-focused developmental engineering strategy,which offers both a solid theoretical foundation and an effective translational solution to overcome the longstanding bottleneck in adult tissue regeneration. 展开更多
关键词 apoptotic extracellular vesicles developmental niche developmental engineering strategyin organ defects mitochondrial complex I hierarchical tissue structures mature organs simulating healing process
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Hierarchical Joint Cross-Modal Attention and Gating Mechanism for Multimodal Sentiment Analysis 认领 引用
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作者 Shuqiu Tan Chunsheng Tan Yahui Liu 《Computers, Materials & Continua》 SCIE EI 2026年第7期1047-1061,共15页
Multimodal sentiment analysis aims to accurately identify emotional states by comprehensively utilizing information from multiple sources such as text,audio,and visual data.However,semantic heterogeneity and temporal ... Multimodal sentiment analysis aims to accurately identify emotional states by comprehensively utilizing information from multiple sources such as text,audio,and visual data.However,semantic heterogeneity and temporal differences exist between different modalities,limiting the effectiveness of feature fusion.To address this issue,this paper proposes a hierarchical joint cross-modal attention and gating mechanism(HJCAG)for multimodal sentiment analysis.This method introduces a hierarchical structure,dividing modal interactions into bimodal and trimodal layers to progressively model the semantic relevance between modalities.First,deep features are extracted from text,audio,and visual modalities using pre-trained models to obtain high-dimensional representations of semantics,speech,and facial expressions,which are then aligned to a unified feature space.Second,a joint cross-modal attention module is designed at the bimodal and trimodal levels,calculating cross-attention weights based on the correlation between the joint feature representation and individual modal representations.Explicit modeling of multimodal interaction relationships and semantic alignment fully leverages the complementary information of different modalities.Furthermore,this paper introduces a gating mechanism to adaptively control the contribution weights of each modal feature,reducing redundant information interference and improving the discriminativeness of the fused representation.Finally,the fused global features are input into the emotion classifier to identify emotional states.The proposed method achieves 75.47±0.22%and 69.25±0.37%accuracy and 76.84±0.45%and 68.97±0.41%weighted F1 scores on the Interactive Emotional Dyadic Motion Capture(IEMOCAP)database and Multimodal EmotionLines Dataset(MELD),respectively,outperforming mainstream multimodal baseline methods,verifying the effectiveness and robustness of the proposed method in multimodal feature fusion and emotion recognition. 展开更多
关键词 Multimodal sentiment analysis cross-modal attention hierarchical structure joint features gating mechanism
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Bolstered bone regeneration by multiscale customized magnesium scaffolds with hierarchical structures and tempered degradation 认领 引用
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作者 Zehui Lv Bo Peng +7 位作者 Yu Ye Haojing Xu Xuejie Cai Jinge Liu Jiabao Dai Yixin Bian Peng Wen Xisheng Weng 《Bioactive Materials》 SCIE CSCD 2025年第4期457-475,共19页
Addressing irregular bone defects is a formidable clinical challenge,as traditional scaffolds frequently fail to meet the complex requirements of bone regeneration,resulting in suboptimal healing.This study introduces... Addressing irregular bone defects is a formidable clinical challenge,as traditional scaffolds frequently fail to meet the complex requirements of bone regeneration,resulting in suboptimal healing.This study introduces a novel 3D-printed magnesium scaffold with hierarchical structure(macro-,meso-,and nano-scales)and tempered degradation(microscale),intricately customized at multiple scales to bolster bone regeneration according to patient-specific needs.For the hierarchical structure,at the macroscale,it can feature anatomic geometries for seamless integration with the bone defect;The mesoscale pores are devised with optimized curvature and size,providing an adequate mechanical response as well as promoting cellular proliferation and vascularization,essential for natural bone mimicry;The nanoscale textured surface is enriched with a layered double hydroxide membrane,augmenting bioactivity and osteointegration.Moreover,microscale enhancements involve a duallayer coating of high-temperature oxidized film and hydrotalcite,offering a robust shield against fast degradation.Eventually,this scaffold demonstrates superior geometrical characteristics,load-bearing capacity,and degradation performance,significantly outperforming traditional scaffolds based on in vitro and in vivo assessments,marking a breakthrough in repairing customized bone defects. 展开更多
关键词 Hierarchical structure Tempered degradation Mg scaffold 3D printing Biodegradable bone implants
Underwater Recoverable Superhydrophobic Surface with Hierarchical Structure 认领 引用
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作者 TAN Zhimin SHEN Hao +2 位作者 ZHAO Yiping YANG Lili GE Dengteng 《Journal of Donghua University(English Edition)》 CAS 2026年第2期1-9,共9页
Underwater superhydrophobic surfaces(SHSs)are promising for drag reduction but are limited by the metastability of underwater air plastrons.Inspired by the replenishment mechanism of the water spider’s air plastron,a... Underwater superhydrophobic surfaces(SHSs)are promising for drag reduction but are limited by the metastability of underwater air plastrons.Inspired by the replenishment mechanism of the water spider’s air plastron,a recoverable SHS with a sparse micro-nano hierarchical structure was fabricated by obtaining a microcone array structure through laser etching and mold replication,followed by the chained nanoparticle deposition and fluorination treatment.The surface exhibited exceptional durability,sustaining 100 abrasion cycles(2 kPa)and 5.5 h water jetting(25 kPa).This is attributed to the microcone array,which protects the superhydrophobic nanoparticles under mechanical action.The hierarchical structure exhibited underwater aerophilicity,which enabled 34 cycles from fully wetting to superhydrophobicity.Rotational rheometric analysis revealed a drag reduction rate of 13.6%.Fluid dynamics simulations showed that the microstructure reduced wall shear stress,achieving a drag reduction rate of 14.2%at a flow velocity of 1 m/s and a wall-slip velocity of 0.15 m/s.This study provides design directions and theoretical foundations for the application of SHS in sustainable drag reduction. 展开更多
关键词 underwater recoverable superhydrophobic surface hierarchical structure air plastron
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Surface reconstructing hierarchical structures as robust sulfion oxidation catalysts to produce hydrogen with ultralow energy consumption 认领 引用 被引量：9
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作者 Taotao Gao Xiangmin Tang +5 位作者 Xiaoqin Li Hai Lan Shumin Yu Shuaiwei Wu Qu Yue Dan Xiao 《Inorganic Chemistry Frontiers》 SCIE EI 2023年第5期1447-1456,共10页
Replacing the oxygen evolution half-reaction by a sulfion oxidation reaction(SOR)with ultra-low theoretical oxidation potential and designing efficient SOR catalysts are promising strategies to decrease the energy con... Replacing the oxygen evolution half-reaction by a sulfion oxidation reaction(SOR)with ultra-low theoretical oxidation potential and designing efficient SOR catalysts are promising strategies to decrease the energy consumption of electrochemical hydrogen production.Here,Ni-doped cobaltous carbonate hydroxide nanorod arrays(Ni-Co-C/NF)are used as unique pre-electrocatalysts for SOR.Ni-doped cobalt carbonate hydroxide in situ transforms into Ni,Co-based sulfides with a high degree of amorphization(Ni-Co-S/NF)during the SOR process.Ni-Co-S/NF achieves high SOR intrinsic activity,and just needs an ultra-low potential of 0.366 V vs.RHE to reach a current density of 100 mA cm−2.Meanwhile,a dissymmetrical acid–base coupled electrolytic system is designed for simultaneous hydrogen and sulfur production using Ni-Co-S/NF as the catalytic electrode.This well-designed system significantly decreases the energy consumption of hydrogen production,and can even generate extra electric energy at low current density.This work provides unique insights into an in situ reconstruction and dissymmetrical electrolyte,which will promote the fast development of hydrogen energy. 展开更多
关键词 electrochemical hydrogen productionhereni doped carbonate hydroxide nanorod arrays ni co c nf sulfion oxidation reaction sor sulfion oxidation hydrogen production hierarchical structures energy consumption carbonate hydroxide
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