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A biomimetic gradient Porous cage with a micro-structure for enhancing mechanical properties and accelerating osseointegration in spinal fusion

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Bioactive Materials 2023年第5期23卷 234-246页

作者： Cheng-Qi Jia Zhen Zhang Shi-Qi Cao Tian-Jiao Wang Hai-Chao Yu Wen-Xiang Wang Bo-Min Guo Xiong-Ying Qiu Yong-Gang You Fan-Qi Hu Jun Zhao Xue-Song Zhang Medical School of Chinese PLA Beijing100853China Department of Orthopedics Chinese PLA General HospitalBeijing100853China Department of Orthopedics of TCM Clinical Unit 6th Medical CenterChinese PLA General HospitalBeijing100853China Research Institute of Aerospace Special Materials and Processing Technology Beijing100074China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190China Academy of Military Medical Sciences Academy of Military SciencesBeijing100080China University of Chinese Academy of Sciences Beijing100049China

Objectives:Spinal fusion is a widely employed treatment of patients with degenerative disc disease,in which a cage is used to replace the disc for spinal fusion.But it often fails for insufficient mechanical strength and poor osseointegration.Here,we designed a polyether-ether-ketone(PEEK)/tantalum(Ta)composite cage with a biomimetic gradient Porous micro-structure,simultaneously enhancing mechanical properties and accelerating osseointegration in spinal fusion.Materials and methods:In the study,based on the mechanical performances of PEEK and osteogenic potential of Ta,and the three-dimensional(3D)structures of cuttlebone and vertebra,the cages were respectively 3D printed by pure PEEK,PEEK with 5 wt%Ta(PEEK/Ta-5),PEEK with 10 wt%Ta(PEEK/Ta-10)and PEEK with 15 wt%Ta(PEEK/Ta-15),then verifiedin vitroand in sheep cervical fusion model systematically.Results:Vertebral Gyroid structure PEEK/Ta-15 cage exhibited superior mechanical properties than Cuttlebone-like structure PEEK/Ta-15 cage,closer to the cervical vertebra.Furthermore,PEEK/Ta-15 cage with higher Ta microparticles in PEEK provided a biomimetic gradient Porous micro-structure with higher surface energy,guiding cell biological behavior,promoting new bone penetration,and accelerating osseointegrationin vivo.Conclusion:In conclusion,the study designed a biomimetic gradient Porous cage with a micro-structure for enhancing mechanical properties,accelerating osseointegration and forming an anatomical lock in the fusion segment through composites,mechanical efficiency,surface extension,and pores.

关键词： Biomimetic Porous Composite Osseointegration Spinal fusion

High-efficient removal of tetracycline in water via Porous magnetic Ce/Fe photocomposite under visible light

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Journal of Rare Earths 2023年第10期41卷 1532-1540,I0003页

作者： Weihang Han Jingxuan Shou Yifan Yang Liangchen Chen Luping Zhang Yutong Chen Xuewei Tu Dan Jin Shijie Zhang Yurong Chang Hui Zheng College of Material Chemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou311121China College of Civil Engineering Zhejiang University of TechnologyHangzhou311121China Hangzhou Zeyuan Safety Technology Co. Ltd.Hangzhou311121China Hangzhou Synbest Biotech Co. Ltd.Hangzhou311121China Henan Qite New Material Co. Ltd.Zhengzhou450000China

Tetracycline is a typical antibiotic commonly used in various industries which is eco-toxic and quickly causes bacterial resistance.Therefo re,studying the efficient removal of tetracycline is necessary to protect the water environment.Herein,a novel Ce/Fe nanoparticle composite(1CCFO)was prepared by the sol-gel method and its removal effects of tetracycline under visible light were performed.The relationship between physicochemical properties of catalyst and photocatalytic degradation effects of tetracycline was analyzed based on a series of characterizations data such as X-ray diffraction(XRD),Raman spectro scopy,a vibrating sample magnetometer(VSM),scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET)method,X-ray photoelectron spectroscopy(XPS),and ultraviolet-visible(UV-Vis)spectroscopy.The results show that Ce/Fe photocatalyst possesses a large specific surface area,good visible light response,abundant oxygen vacancies and excellent redox performance,exhibiting good adsorption capacity,remarkable catalytic performance and stability.The optimal conditions for tetracycline removal were explored through orthogonal experiments.About 88%of tetracycline can be photodegraded in 1 h under optimal conditions.The possible decomposition pathways,main reactive oxygen species and suitable mechanism of the photocatalytic system were studied by liquid chromatography-mass spectro metry(LC-MS),an electron spin resonance(ESR)spectrometer and free radical quenching experiments.The results show that 1CCFO has an efficient degradation effect on tetracycline under visible light,which provides a feasible method to improve the performance of 1CCFO.

关键词： Photocatalysis Degradation Tetracycline Fe-based photocatalyst Porous Rare earths

Three-dimensional ordered Porous N-doped carbon-supported accessible Ni-N_(X) active sites for efficient CO_(2) electroreduction

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Rare Metals 2023年第6期42卷 1800-1807页

作者： Si-Jia Zheng Hua Cheng Jin Yu Qin Bie Jing-Dong Chen Feng Wang Rui Wu Daniel John Blackwood Jun-Song Chen Gathering and Transmission Technology Research Institute of Southwest Oil and Gas Field Company of CNPC Chengdu610000China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu611731China Department of Materials Science and Engineering National University of SingaporeSingapore117574Singapore

Electrocatalytic reduction of carbon dioxide(CO_(2)RR) into high value-added chemicals and fuels has been regarded as a promising approach to achieve carbon neutrality.Though nickel-nitrogen-carbon(Ni-N-C) electrocatalysts have shown superior CO_(2)RR performance,the synthesis of highly effective Ni-N-C catalyst is still challenging.Herein,a three-dimensional(3D) ordered Porous nitrogendoped carbon-supported Ni-N_(x) catalyst has been synthesized by direct pyrolysis of a mixture of SiO_(2),polyvinyl pyrrolidone,nickel-phenanthroline complex,followed by the removal of the SiO_(2) templates.

关键词： ordered Porous nickel

Hydrogel-based composites beyond the Porous architectures for electromagnetic interference shielding

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Nano Research 2022年第10期15卷 9614-9630页

作者： Yunfei Yang Mingrui Han Wei Liu Na Wu Jiurong Liu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials School of Materials Science and EngineeringShandong UniversityJinan 250061China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Shenzhen research institute of Shandong University Shenzhen 518052China Department of Chemistry and Applied Biosciences ETH ZurichZurich CH-8093Switzerland

With the rapid development of the electronic industry and wireless communication technology,electromagnetic interference(EMI)or pollution has been increasingly serious.This not only severely endangers the normal operation of electronic equipment but also threatens human health.Therefore,it is urgent to develop high-performance EMI shielding materials.The advent of hydrogel-based materials has given EMI shields a novel option.Hydrogels combined with conductive functional materials have good mechanical flexibility,fatigue durability,and even high stretchability,which are beneficial for a wide range of applications,especially in EMI shielding and some flexible functional devices.Herein,the current progress of hydrogel-based EMI shields was reviewed,in the meanwhile,some novel studies about pore structure design that we believe will help advance the development of hydrogel-based EMI shielding materials were also included.In the outlook,we suggested some promising development directions for the hydrogel-based EMI shields,by which we hope to provide a reference for designing hydrogels with excellent EMI shielding performance and multifunctionalities.

关键词： electromagnetic interference(EMI)shielding Porous hydrogels structural design composites

Magnesium surface-activated 3D printed Porous PEEK scaffolds for in vivo osseointegration by promoting angiogenesis and osteogenesis

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生物活性材料(英文) 2023年第2期20卷 16-28页

作者： Xinghui Wei Wenhao Zhou Zhen Tang Hao Wu Yichao Liu Hui Dong Ning Wang Hai Huang Shusen Bao Lei Shi Xiaokang Li Yufeng Zheng Zheng Guo Department of Orthopaedics Tangdu HospitalFourth Military Medical UniversityXi’anShaanxi710038China Northwest Institute for Nonferrous Metal Research Xi’anShaanxi710016China Department of Orthopaedics Xijing HospitalFourth Military Medical UniversityXi’anShaanxi710032China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing100871China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China

Polyetheretherketone(PEEK)has been an alternative material for titanium in bone defect repair,but its clinical application is limited by its poor osseointegration.In this study,a Porous structural design and activated surface modification were used to enhance the osseointegration capacity of PEEK materials.Porous PEEK scaffolds were manufactured via fused deposition modeling and a polydopamine(PDA)coating chelated with magnesium ions(Mg^(2+))was utilized on the surface.After surface modification,the hydrophilicity of PEEK scaffolds was significantly enhanced,and bioactive Mg^(2+)could be released.In vitro results showed that the activated surface could promote cell proliferation and adhesion and contribute to osteoblast differentiation and mineralization;the released Mg^(2+)promoted angiogenesis and might contribute to the formation of osteogenic H-type vessels.Furthermore,Porous PEEK scaffolds were implanted in rabbit femoral condyles for in vivo evaluation of osseointegration.The results showed that the customized three-dimensional Porous structure facilitated vascular ingrowth and bone ingrowth within the PEEK scaffolds.The PDA coating enhanced the interfacial osseointegration of Porous PEEK scaffolds and the released Mg^(2+)accelerated early bone ingrowth by promoting early angiogenesis during the coating degradation process.This study provides an efficient solution for enhancing the osseointegration of PEEK materials,which has high potential for translational clinical applications.

关键词： Polyetheretherktone Porous Magnesium Angiogenesis Osteogenesis

MOF glass foam: a blueprint to Porous membrane scaling-up

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Science China Chemistry 2024年第3期67卷 746-748页

作者： Yuan Peng Weishen Yang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

In comparison with conventional energy-intensive separation technologies, such as distillation and crystallization,membrane separation is labelled as an advanced technology with low energy consumption, a small carbon footprint,continuous operation, etc. Metal-organic frameworks(MOFs) are a burgeoning category of crystalline materials consisting of metal ions/clusters coordinated with organic ligands.

关键词： separation Porous distillation

Facile synthesis of Fe single-atom Porous photocatalysts via direct metal atomization achieving efficient photocatalytic nitrogen fixation

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Journal of Materials Science & Technology 2023年第36期167卷 248-257页

作者： Tong Hu Guanjie Jiang Yupeng Yan Shuai Lan Junjie Xie Qin Zhang Yang Li Key Laboratory of Agricultural Resources and Ecology in Poyang Lake Watershed of Ministry of Agriculture and Rural Affairs in China Jiangxi Agricultural UniversityNanchang 330045China

Photocatalytic nitrogen fixation has been explored as a feasible pathway for ammonia synthesis.How-ever,the convenient and efficient preparation of photocatalysts for nitrogen fixation remains a challenge.Meanwhile,the reaction pathway and mechanism of photocatalytic nitrogen fixation are unclear.Herein,single-atom Fe-Porous g-C_(3)N_(4)(FPx)samples were manufactured using a one-step anneal technique via bubble template and direct metal atomization.Characterization results indicate that FPx has a Porous structure and single-atom Fe.The Porous structure exposed more active centers.Simultaneously,single-atom Fe changes the adsorption mode of N_(2)from physical to chemical and turns the photocatalytic ni-trogen fixation from the associative distal pathway to the associative alternating pathway.Consequently,without any sacrificial agent or cocatalysts,FPx presents a prominent increase in photocatalytic activ-ity,reaching 62.42μmol h^(−1)g^(−1),over fivefold larger than that of bulk g-C_(3)N_(4).This work provides new insights into photocatalytic nitrogen fixation and achieves efficient N_(2)photoreduction by constructing single-atom photocatalysts.

关键词： Single-atom Fe Porous Graphitic carbon nitride Photocatalytic nitrogen fixation

Pomegranate-like Porous NiCo_(2)Se_(4) spheres with N-doped carbon as advanced anode materials for Li/Na-ion batteries

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Green Energy & Environment 2022年第3期7卷 554-565页

作者： Xin Liu Liwen Yang Guobao Xu Juexian Cao School of Physics and Optoelectronics&Hunan Institute of Advanced Sensing and Information Technology Xiangtan UniversityXiangtan411105China School of Materials Science and Engineering Xiangtan UniversityXiangtan411105China

Design and preparation of dual-role anode materials with extraordinary performance for rechargeable Li/Na-ion batteries (LIBs/NIBs) remains highly challenging.Herein,three-dimensional (3D) pomegranate-like Porous bimetallic NiCo_(2)Se_(4) spheres with N-doped carbon (termed as NC@NiCo_(2)Se_(4)) are synthesized by solvothermal method and annealing.Microstructure investigations reveal that the NC@NiCo_(2)Se_(4) spheres include nano-sized NiCo_(2)Se_(4) particles as inner core and NiCo_(2)Se_(4) with the modification of thin-walled N-doped carbon layer as inner/outer shell.The bimetallic NC@NiCo_(2)Se_(4) spheres possess synergistic interaction of Ni/Co atoms to enhance intrinsic conductivity and electrochemical activity,unique pomegranate-like structure with an inner void space and robust shell to mitigation volume expansion,and intimate contact of N-doped carbon layer to improve interface effect and accelerate conversion kinetics.As anode materials,the NC@NiCo_(2)Se_(4) exhibits superior lithium/sodium storage performances (1401.6 and 794.8 mA h g^(-1)at current density of 0.5 and 5 A g^(-1)after 500 cycles for LIBs as well as 433.9 mA h g^(-1)at 3 A g^(-1)after 1000 cycles and a high capability of 306.6 mA h g^(-1)at 20 A g^(-1)for NIBs).This work represents an impressive strategy for future research of bimetallic selenides as anode materials for advanced high-performance LIBs/NIBs.

关键词： kinetics spheres Porous

Physics of Porous materials under extreme laser-generated conditions

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Matter and Radiation at Extremes 2024年第3期9卷 1-3页

作者： V.T.Tikhonchuk S.Weber Extreme Light Infrastructure ERIC ELI Beamlines Facility25241 DolníBrezanyCzech Republic CELIA University of Bordeaux33405 TalenceFrance

Porous materials offer unique possibilities for the production of plasmas with controlled density profiles for experiments on laser–matter interaction.They are of growing relevance to many applications,such as inertial confinement fusion,fundamental research,and secondary sources.Understanding the processes of transformation of a Porous solid into a plasma is of fundamental interest and is needed for producing materials with desired properties.

关键词： interaction. properties. Porous