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Degradable magnesium alloy suture promotes fibrocartilaginous interface regeneration in a rat rotator cuff transosseous repair model

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Journal of Magnesium and Alloys 2024年第1期12卷 384-393页

作者： Baoxiang Zhang Wen Zhang Fei Zhang Chao Ning Mingyang An Ke Yang Lili Tan Qiang Zhang Department of Sports Medicine Chinese PLA General HospitalBeijing 100853China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Medical School of PLA Beijing 100853China Institute of Orthopedics Chinese PLA General HospitalBeijing Key Lab of Regenerative Medicine in OrthopedicsKey Lab of Musculoskeletal Trauma&War Injuries of Chinese PLABeijing 100853China

Despite transosseous rotator cuff tear repair using sutures is widely accepted for tendon-bone fixation,the fibrocartilaginous enthesis regeneration is still hardly achieved with the traditional *** the present work,degradable magnesium(Mg)alloy wire was applied to suture supraspinatus tendon in a rat acute rotator cuff tear model with Vicryl Plus 4±0 absorbable suture as *** shoulder joint humerus-supraspinatus tendon complex specimens were retrieved at 4,8,and 12 weeks after *** Mg alloy suture groups showed better biomechanical properties in terms of ultimate load to *** observation showed that hyperplastic response of the scar tissue at the tendon-bone interface is progressively alleviated over time in the both Mg alloy suture and Vicryl suture *** the histological analysis,for Mg alloy suture groups,chondrocytes appear to proliferate at 4 weeks postoperatively,and the tendon-bone interface showed an orderly structural transition zone at 8 weeks *** collagenous fiber tended to be aligned and the tendon-bone interlocking structures apparently formed,where transitional structure from unmineralized fibrocartilage to mineralized fibrocartilage was closer to the native fibrocartilaginous *** vivo degradation of the magnesium alloy wire was completed within 12 *** results indicated that Mg alloy wire was promising as degradable suture with the potential to promotes fibrocartilaginous interface regeneration in rotator cuff repair.

关键词： Rotator cuff repair Mg alloy wire Tendon-bone healing Fibrocartilaginous interface

Corrosion mechanisms of Zr-based bulk metallic glass in NaF and NaCl solutions

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Journal of Materials Science & Technology 2020年第11期42卷 33-43页

作者： Zhangweijia Qiu Zhengkun Li Huameng Fu Hongwei Zhang Zhengwang Zhu Aimin Wang Hong Li Long Zhang Haifeng Zhang School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shenyang National Laboratory for Material Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenyang Amorphous Metal Manufacturing Co. LtdShenyang 110000China dongguan Eontec Co. LtdDongguan 523662China

So far,some investigations related to the corrosion mechanism of Zr-based metallic glasses in solutions containing Cl-have been ***,few attentions have been paid to the situation in F--containing *** paper describes the corrosion behaviours of Zr52Al10Ni6Cu32 bulk metallic glass(BMG)in Na F and Na Cl aqueous *** corrosion mechanism of Zr-based BMG in F–containing solution was proposed for the first *** was found that in Na Cl solutions,Zr-based BMG samples underwent typical pitting *** dissolution of Zr,Al and enrichment of Cu were observed in corrosion ***,corrosion occurred in the form of general breakdown of passive film in Na F *** difference is interpreted in terms of the binding ability of anions to surrounding molecules,i.e.,Cl-with loose surrounding water passes through the passive film to cause pitting;F-with a tight surrounding molecules layer absorbs on passive film then coordinates with cations from matrix.

关键词： Metallic glass Zirconium Corrosion behavior Pitting corrosion Passivation

Magnesium alloys for orthopedic applications:A review on the mechanisms driving bone healing

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Journal of Magnesium and Alloys 2022年第12期10卷 3327-3353页

作者： Ning Wang Shude Yang Huixin Shi Yiping Song Hui Sun Qiang Wang Lili Tan Shu Guo Department of Plastic Surgery The First Hospital of China Medical UniversityNo.115 Nanjing North StreetShenyang 110001China Liaoning Provincial Key Laboratory of Oral Diseases School and Hospital of StomatologyChina Medical UniversityNo.117 Nanjing North StreetShenyang 110001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesNo.72 Wenhua RoadShenyangLiaoning 110016China

Magnesium(Mg) alloys have attracted a wealth of attention in orthopedic fields for their superior mechanical properties, degradability,and excellent biocompatibility. Consistently, to resolve the issues on rapid degradation, more studies are dedicated to the researches on the composition design, preparation and processing, surface modification, the degradation modes of Mg alloys. Nevertheless, the mechanisms by which Mg alloys promote bone healing remain elusive. This review gives an account of specific mechanisms on Mg alloys promoting bone healing from four aspects, immunomodulatory, angiogenesis, osteogenesis and regulation of osteoclast function. We highlight the regulation of Mg alloys on the functional status and interactions of numerous cells that are involved in bone healing, including immune cells, osteogenicrelated cells, osteoclasts, endothelial cells(ECs), nerve cells, etc., and summarize the signaling pathways involved, with the aim to provide the basis and support on future investigation on mechanisms on Mg alloys driving bone regeneration. More importantly, it provides a rationale and a general new basis for the application of Mg alloys in orthopedic fields.

关键词： Magnesium alloys Bone regeneration Immunomodulation Angiogenesis Osteogenesis

Homologous gradient heterostructure-based artificial synapses for neuromorphic computation

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InfoMat 2023年第1期5卷 95-105页

作者： Changjiu Teng Qiangmin Yu Yujie Sun Baofu Ding Wenjun Chen Zehao Zhang Bilu Liu Hui-Ming Cheng Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute and Institute of Materials ResearchShenzhen International Graduate SchoolTsinghua UniversityShenzhenPeople's Republic of China Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of ScienceShenzhenPeople's Republic of China School of Electronic and Information Engineering Foshan UniversityFoshanPeople's Republic of China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyangPeople's Republic of China

Gradient heterostructure is one of fundamental interfaces and provides an effective platform to achieve gradually changed properties in mechanics,optics,and *** different types of heterostructures,the gradient one may provide multiple resistive states and immobilized conductive fila-ments,offering great prospect for fabricating memristors with both high neuromorphic computation capability and ***,we invent a memristor based on a homologous gradient heterostructure(HGHS),compris-ing a conductive transition metal dichalcogenide and an insulating homolo-gous metal *** made of Ta–TaS_(x)O_(y)–TaS 2 HGHS exhibits continuous potentiation/depression behavior and repeatable forward/backward scanning in the read-voltage range,which are dominated by multi-ple resistive states and immobilized conductive filaments in HGHS,***,the continuous potentiation/depression behavior makes the memristor serve as a synapse,featuring broad-frequency response(10^(-1)–10^(5) Hz,covering 106 frequency range)and multiple-mode learning(enhanced,depressed,and random-level modes)based on its natural and moti-vated forgetting *** HGHS-based memristor also shows good unifor-mity for 5?7 device *** work paves a way to achieve high-performance integrated memristors for future artificial neuromorphic computation.

关键词： artificial synapses broad-frequency range gradient heterostructures homologous memristors neuromorphic computation

Co- and post-seismic slip analysis of the 2017 M_(W)7.3 Sarpol Zahab earthquake using Sentinel-1 data

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Geodesy and Geodynamics 2022年第2期13卷 151-159页

作者： Lejun Lu Yu Zhou guangdong Provincial Key Laboratory of Geodynamics and Geohazards School of Earth Sciences and EngineeringSun Yat-sen UniversityZhuhai519000China Southern Marine Science and Engineering guangdong Laboratory(Zhuhai) Zhuhai519082China

The M_(w)7.3 Sarpol Zahab earthquake that occurred in the Zagros Fold-Thrust Belt(ZFTB) of Iran on November 12,2017 is the largest earthquake instrumentally recorded in the *** earthquake provides an opportunity to investigate the slip behaviour and frictional properties of the fault,which is significant for assessing future seismic *** this study,we use Sentinel-1 images to map the coand post-seismic deformation to invert for the fault *** result indicates that most of the coseismic slip is buried in the depth range of 11-17 km,and the maximum slip is about 3.8 m at a depth of 15 *** coseismic slip induces an increase of Coulomb stress in the unruptured area of the seismogenic fault plane,driving the *** on the stress-driven afterslip,we obtain a frictional parameter of(ab)=(0.001-0.002) for the updip afterslip zone and(a-b)=0.0002 for the downdip afterslip zone in the framework of rate-and-state *** constitutive parameter(a-b) of the fault is very small,suggesting that the fault segments are close to velocity-neutral and may experience coseismic rupture.

关键词： 2017 M_(W)7.3 Sarpol Zahab earthquake Sentinel-1 Co-and post-seismic deformation Fault frictional properties

Coupled intramolecular/heterointerfacial electron transfer in polyelectrolyte-shielded Iso-type black phosphorus hetero-structure boosts oxygen reduction kinetics

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Journal of Energy Chemistry 2021年第12期30卷 468-476,I0011页

作者： Zhongke Yuan Jing Li Zhengsong Fang Meijia Yang Kancheng Mai Dingshan Yu Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Key Laboratory of High Performance Polymer-based Composites of Guangdong ProvinceSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275GuangdongChina

Searching new structured black phosphorus(BP)and exploring intriguing functions and applications have become a hot topic so ***,we introduce a novel Iso-type black phosphorus heterostructure guided by first principle calculation,which features unique heterointerface and electronic coupling interaction via stacking assembly of exfoliated black phosphorus(EBP)and amine-functionalized EBP(N-EBP).Inspired by the theoretical results,we constructed the Iso-type heterostructure comprising of ultrathin exfoliated few-layered EBP and N-EBP,both of which were derived from identical bulk *** purposive amine-functionalization not only creates positively-charged P atoms on N-EBP as effective active sites via N-induced intramolecular electron transfer(IET)but also endows N-EBP with lower work function relative to EBP,while the unique EBP/N-EBP Iso-type heterostructure engenders directional heterointerfacial electron transfer(HET).The coupled IET/HET effects optimize the charge redistribution to afford favorable O_(2)*** this case,our unique strategy for the first time exploits the inherent catalytic capability of BP toward the oxygen reduction reaction(ORR)and enables the first use of BP as metal-free ORR catalysts for Zn-air *** newly-designed heterostructure facilitates a 4-e^(-)transfer ORR relative to inactive EBP or ***,the polymer-shielded heterostructure acts as efficient air electrodes to endow a primary Zn-air cell with high stability,large capacity and high energy density—superior to the commercial Pt/C-enabled *** study as the first report on metal-free BP-based ORR catalysts and air electrodes not only extends BP's application scopes but also renders new insight toward design of electronically-coupled superstructures for energy-related applications.

关键词： Black phosphorus Iso-type heterostructure Intramolecular electron transfer Heterointerfacial electron transfer Oxygen reduction

Three-dimensional (3D) scaffolds as powerful weapons for tumor immunotherapy

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Bioactive Materials 2022年第11期7卷 300-319页

作者： Shuyan Han Jun Wu School of Biomedical Engineering Sun Yat-sen UniversityShenzhen518057China

Though increasing understanding and remarkable clinical successes have been made, enormous challenges remain to be solved in the field of cancer immunotherapy. In this context, biomaterial-based immunomodulatory strategies are being developed to boost antitumor immunity. For the local immunotherapy, macroscale bioma-terial scaffolds with 3D network structures show great superiority in the following aspects: facilitating the encapsulation, localized delivery, and controlled release of immunotherapeutic agents and even immunocytes for more efficient immunomodulation. The concentrating immunomodulation in situ could minimize systemic tox-icities, but still exert abscopal effects to harness the power of overall anticancer immune response for eradicating malignancy. To promote such promising immunotherapies, the design requirements of macroscale 3D scaffolds should comprehensively consider their physicochemical and biological properties, such as porosity, stiffness, surface modification, cargo release kinetics, biocompatibility, biodegradability, and delivery modes. To date, increasing studies have focused on the relationships between these parameters and the biosystems which will guide/assist the 3D biomaterial scaffolds to achieve the desired immunotherapeutic outcomes. In this review, by highlighting some recent achievements, we summarized the latest advances in the development of various 3D scaffolds as niches for cancer immunotherapy. We also discussed opportunities, challenges, current trends, and future perspectives in 3D macroscale biomaterial scaffold-assisted local treatment strategies. More importantly, this review put more efforts to illustrate how the 3D biomaterial systems affect to modulate antitumor immune activities, where we discussed how significant the roles and behaviours of 3D macroscale scaffolds towards in situ cancer immunotherapy in order to direct the design of 3D immunotherapeutic.

关键词： Three-dimensional(3D) Macroscale Hydrogels Scaffolds Cancer immunotherapy

Molecular structure on the detoxification of fluorinated liquid crystal monomers with reactive oxidation species in the photocatalytic process

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Environmental Science and Ecotechnology 2022年第1期9卷 10-16页

作者： Shaoxiong He Mingjie Shen Enya Wu Renli Yin Mingshan Zhu Lixi Zeng guangdongKey Laboratory of Environmental Pollution and Health School of EnvironmentGuangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental QualityJinan UniversityGuangzhou511443China

Fluorinated liquid crystal monomers(LCMs)are begun to emerge as new persistent organic ***,the structure-reactivity relationships of fluorinated LCMs 1,2,3-trifluoro-5-[3-(3-propylcyclohexyl)cyclohexyl]benzene(TPrCB),1,2-difluoro-4-[trans-4-(trans-4-propylcyclohexyl)cyclohexyl]benzene(DPrCB),4-[(trans,trans)-4'-(3-Buten-1-yl)[1,10-bicyclohexyl]-4-yl]-1,2-difluoro-benzene(BBDB)and 1-[4-(4-ethylcyclohexyl)cyclohexyl]-4(trifluoromethoxy)benzene(ECTB)subject to photocatalysis-generated oxidation species were *** degradation rate constant of BBDB was 3.0,2.6,and 6.8 times higher than DPrCB,TPrCB and ECTB,*** results reveal that BBDB,DPrCB and TPrCB had mainly negative electrostatic potential(ESP)regions which were vulnerable to electrophilic attack by h^(+),·OH and·O_(2)^(-),while ECTB was composed of mainly positive ESP regions which were vulnerable to nucleophilic attack by·OH and·O_(2)^(-).The detoxification processes of BBDB,DPrCB and TPrCB included carbon bond cleavage and benzene ring ***,the methoxy group of ECTB reduced the nucleophilic reactivity on the benzene ring,leading to slower detoxification *** findings may help to develop LCMs treatment technologies based on structure-reactivity relationships。

关键词： Fluorinated liquid crystal monomers Structure-reactivity relationships Photocatalytic process Electrostatic potential distribution Detoxification

In situ synthesis of graphitic-C3N4 nanosheet hybridized N-doped TiO2 nanofibers for efficient photocatalytic H2 production and degradation

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Nano research 2015年第4期8卷 1199-1209页

作者： Cheng Han Yingde wang Yongpeng Lei Bing Wang Nan Wu Qi Shi Qiong Li Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense Technology Changsha 410073 China College of Materials Science and Engineering Wuhan Textile University Wuhan 430074 China College of Basic Education National University of Defense Technology Changsha 410073 China State Key Laboratory ofLow-Dimensiona/Quantum Physics and Department ofChemistry Tsinghua University Beijing 100084 China

Graphitic carbon nitride nanosheets （g-C3N4 NSs） hybridized nitrogen doped titanium dioxide （N-TiO2） nanofibers （GCN/NT NFs） have been synthesized in situ via a simple electrospinning process combined with a modified heat-etching method. The prepared GCN/NT NFs were characterized by a variety of methods and their photocatalytic activities were evaluated by hydrogen （H2） production from water splitting and degradation of rhodamine B in aqueous solution. It was found that the GCN/NT NFs have a mesoporous structure, composed of g-C3N4 NSs and N-doped TiO2 crystallites. The g-C3N4 NSs synthesized after heat-etching were found to be embedded in, and covered, the hybrid NFs to form stable interfaces. The partial decomposition of g-C3N4 releases its nitrogen content which eventually gets doped into the nearby TiO2 skeleton. The GCN/NT NFs give a high photocatalytic H2 production rate of 8,931.3 μmol·h^-1·g^-1 in aqueous methanol solution under simulated solar light. Such a highly efficient photocatalytic perfor- mance can be ascribed to the combined effects of g-C3N4 NSs and N-doped TiO2 with enhanced light absorption intensity and improved electron transport ability. Also, the large surface area of the mesoporous NFs minimizes light reflection on the surface and provides more surface-active sites. This work highlights the potential of quasi-one dimensional hybrid materials in the field of solar energy conversion.

关键词： photocatalyst graphitic carbon nitride titanium oxide nanofiber hydrogen production