Journal of Materials Science & Technology最新文献

{"title":"Formation mechanism and microstructural evolution of bubbles during ultra-high temperature oxidation of multicomponent carbides","authors":"Shiyan Chen, Zhaoke Chen, Weilong Song, Yi Zeng, Fengminyu Xie, Zhennan Xu, Xiang Xiong","doi":"10.1016/j.jmst.2024.12.107","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.107","url":null,"abstract":"Bubbles are prevalent defects on the oxidized surfaces of ultra-high temperature carbides, compromising structural stability and oxidation resistance. Despite their significance, the formation mechanisms and microstructural evolution of bubbles during ultra-high temperature oxidation remain inadequately understood. To address this gap, the bubble behaviors of multicomponent carbides, including (Hf,Ti)C, (Hf,Zr,Ti)C, (Hf,Zr,Ti,Ta)C, and (Hf,Zr,Ti,Nb)C, were investigated under oxidation conditions at 2500°C. The roles of various elements were elucidated through first-principles calculations. Results show that the formation of a dense composite oxide layer is essential for bubble generation, with the release of gaseous products serving as the primary driving force. The microstructure of the bubbles is influenced by the matrix composition. The addition of Ti, Ta, and Nb significantly lowers the surface energy of the shell oxides, providing preferential nucleation sites for bubbles. The progressive oxidation of Ti leads to the formation of a \"TiO₂-TiO-HfO₂\" multilayer structure at the bubble top, which evolves into a dendritic structure with prolonged oxidation. Ta and Nb further modulate the size and number of bubbles by altering the composition and surface energy of the shell oxides.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"24 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Suppressed defect production and hardening in refractory high entropy alloys under ion irradiation at early stage: A comparative study between VTaTi, HfNbZrTi, and conventional V-4Cr-4Ti","authors":"Zhixi Zhu, Shang Chen, Qiuhong Zhang, Lei Li, Yuqing Zhao, Xun Guo, V.V. Uglov, Ke Jin, Yunfei Xue","doi":"10.1016/j.jmst.2025.01.058","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.01.058","url":null,"abstract":"Refractory high entropy alloys (RHEAs) have drawn much attention for their potential applications in advanced reactors. While improved irradiation resistance to void swelling and helium bubble formation has been frequently reported, experimental investigation regarding their early-stage irradiation damage remains insufficient, which hinders the understanding of the behavior of point defects and small clusters. Here we select two typical RHEAs with desired mechanical properties, VTaTi and HfNbZrTi, as well as a conventional V-4Cr-4Ti alloy, and compare their irradiation-induced defect production and hardening under a low-dose irradiation of 0.1 dpa. Significant hardening is observed in V-4Cr-4Ti due to the pinning of deformation-induced dislocations by the high density of irradiation-induced loops. In contrast, the hardening in VTaTi is much weaker, corresponding well to the greatly reduced defect density. Strikingly, in HfNbZrTi, visible defect clusters are not observed with a Cs-corrected transmission electron microscope in the whole irradiation range, and no hardening effect is detected. Such strong suppression of irradiation damage is attributed to the large lattice distortion based on the <em>ab initio</em> calculations and the local chemical fluctuations based on the atomic-scale elemental mappings, which together hinder the mobility of interstitials. Furthermore, minor irradiation softening is evidenced by cross-sectional nanoindentation tests in HfNbZrTi, which is considered to be related to the evolution of short-range orders and interstitial impurities after irradiation.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"29 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Porous pure magnetic foam with engineered heterointerfaces for enhanced microwave absorption","authors":"Wangchang Li, Xinyue Xu, Lun Fan, Jie Zhang, Yuetong Qian, Yue Kang, Ting Zou, Xiao Han, Yao Ying, Jing Yu, Jingwu Zheng, Liang Qiao, Juan Li, Min Wu, Renchao Che, Shenglei Che","doi":"10.1016/j.jmst.2024.12.106","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.106","url":null,"abstract":"Despite significant progress in the structure and properties of porous absorbing materials, major challenges remain due to complex preparation technology, high production costs, and poor corrosion resistance. In this study, nanowires were used as the substrate, liquid nitrogen controls ice crystal growth orientation, and ammonia gas facilitates the generation of magnetic substances. The resulting pure magnetic porous foam (PMF) material exhibits enhanced performance in absorbing electromagnetic waves (EMWs) and improved corrosion resistance. The PMF's microstructure was analyzed for its dielectric and magnetic loss characteristics. The PMF combines a porous framework, nanoscale architecture, and exclusive magnetic components to create a lightweight foam absorbent material with enhanced magnetic dissipation capabilities. Among them, the Fe₄N PMF demonstrates an impressive minimum reflection loss (RL_min) value of −66.8 dB at a thickness of 1.09 mm, exhibits an effective absorption bandwidth of 4.00 GHz, and shows exceptional corrosion resistance with a self-corrosion potential of −0.65 V. Moreover, the effectiveness of the Fe₄N PMF in absorbing intelligent EMWs has been validated through radar cross-section (RCS) simulations. In summary, this study has developed electromagnetic wave-absorbing materials with slim profiles, lightweight properties, strong absorption capabilities, and excellent corrosion resistance. These characteristics make them highly promising for microwave absorption applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"18 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical properties and deformation behavior of Mg-Al-Zn alloy laminate with multi-scale heterostructures","authors":"Shuaishuai Liu, Xiang Chen, Tianjiao Li, Wenhuan Chen, Liping Zhong, Yongjian Wang, Manoj Gupta, Guangsheng Huang, Bin Jiang, Fusheng Pan","doi":"10.1016/j.jmst.2024.12.103","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.103","url":null,"abstract":"Heterostructured materials as a new class can effectively avoid the inverted relationship of the “banana” curve followed by strength-ductility. The difference in grain size is the mainstream idea of the design of heterogeneous zones. However, the synergistic strengthening mechanism and deformation behavior among multi-scale heterostructures are still unclear. In this work, AZ80/AZ31 laminate with a multi-scale heterogeneous distribution of grain size, precipitates, and texture between alternate AZ31 and AZ80 component layers, which was constructed by accumulative extrusion bonding combined with aging treatment. The composite samples after 2-pass extrusion presented an outstanding strength-ductility synergy, which was attributed to the joint action of texture softening and hardening, grain refinement as well as multistage heterogeneous deformation induced (HDI) strengthening and hardening. Multi-types of heterogeneous regions provided more sites for geometrically necessary dislocation accumulation to accommodate multiple strain gradients under the constraint of multi-layer interfaces, enhancing HDI stress. The synergistic effect of great Schmid factor difference and increasing geometric compatibility factor between adjacent grains at the layer interface led to strain transfer behavior, which facilitated strain delocalization. This work expands the design ideas and preparation methods of heterostructured materials and enriches the theory of heterogeneous deformation.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"71 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photocatalytic H2 evolution over Ni3(PO4)2/twinned-Cd0.5Zn0.5S S-scheme homo-heterojunction using degradable plastics as electron donors","authors":"Jingzhuo Tian, Chaohong Guan, Qiqi Zhang, Tao Sun, Haobin Hu, Enzhou Liu","doi":"10.1016/j.jmst.2024.12.102","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.102","url":null,"abstract":"The development of catalysts that can efficiently separate both bulk and interface charges is crucial for conversion and utilization of solar energy. In this study, a homo-heterojunction was fabricated by combining twinned-Cd_0.5Zn_0.5S (T-CZS) and Ni₃(PO₄)₂ with crystalline water (NiPO) using a solvent evaporation strategy for efficient photocatalytic H₂ evolution in water containing degradable plastics. The bulk phase of T-CZS consists of wurtzite Cd_0.5Zn_0.5S (WZ-CZS) and zinc blende Cd_0.5Zn_0.5S (ZB-CZS), they exhibit a slight difference in energy range and can form S-scheme homojunction, while NiPO and T-CZS constitute the S-scheme heterojunction, they work together to promote the separation of bulk and interface charges. This double S-scheme homo-heterojunction achieves a hydrogen evolution rate (<span><math><msub is=\"true\"><mi is=\"true\">r</mi><msub is=\"true\"><mi is=\"true\" mathvariant=\"normal\">H</mi><mn is=\"true\">2</mn></msub></msub></math></span>) of 73.2 mmol h⁻¹ g⁻¹ over 8% NiPO/T-CZS in a solution mainly composed of polylactic acid (PLA), which exhibits an increase by factors of 243.0 and 4.5 compared to NiPO and T-CZS individually. Meanwhile, PLA plastics are degraded into organic chemicals including formic acid, acetic acid, and pyruvic acid. Moreover, NiPO exhibits (localized surface plasmon resonance) LSPR effect, which can broaden the light absorption range of the system, reduce the H₂ evolution overpotential, and enhance electron utilization efficiency. Based on electron capture experiments and band theory analysis, the introducing of plastic as an electron donor further accelerates the evolution process of H₂, while alkaline sodium hydroxide (NaOH) solution promotes the PLA dissociation and enhances oxidation driving force, indirectly promoting the H₂ evolution kinetics of this system. The present research offers prospective solutions for engineering solar-powered H₂ evolution to tackle energy challenges.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"23 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Grain morphologies in additively manufactured alloys: from solidification fundamentals to advanced microstructure control","authors":"Siyuan Wei, Pei Wang, Long Zhang, Upadrasta Ramamurty","doi":"10.1016/j.jmst.2025.02.033","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.02.033","url":null,"abstract":"In comparison to the alloys manufactured using the conventional means, microstructures of the alloys additively manufactured (AM) using techniques such as laser powder bed fusion (LPBF), directed energy deposition (DED) and e-beam powder bed fusion (EPBF) are considerably more complex, making them unamenable for an easy interpretation even for a well-trained metallurgist. Keeping this in view, an overview of different grain morphologies that are observed in AM alloys is presented, with the objective of a systematic elucidation of the melt pool geometry and thermal history's role on the microstructural evolution. The second part of this review focuses on strategies that are available for manipulating the grain structures for tailoring the microstructures of AM alloys.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"63 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extremely low temperature mechanical behavior of in-situ oxide containing 304L stainless steel fabricated by laser powder bed fusion","authors":"Kwangtae Son, Seung-Min Jeon, Brian K. Paul, Young-Sang Na, Kijoon Lee, Young-Kyun Kim","doi":"10.1016/j.jmst.2025.02.030","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.02.030","url":null,"abstract":"This study investigates the mechanical properties and microstructure of SS304L stainless steel (SS) fabricated via laser powder bed fusion (LPBF) under controlled oxygen levels (0.2%) at both room and cryogenic temperatures (77 K and 4 K). Experimental results show that the LPBF SS304L exhibits significant improvements in yield strength (YS), with an increase of ≈336 MPa at room temperature and up to ≈398 MPa at 4 K compared to wrought SS304L. Additionally, the current LPBF SS304L demonstrates an extra ≈64 MPa YS strengthening over previous LPBF SS304L data at room temperature. These strength enhancements are primarily attributed to oxide dispersion hardening, promoted by the controlled oxygen level, alongside grain boundary strengthening and dislocation hardening, without significant ductility loss. Furthermore, strain-induced martensitic transformation (SIMT) was absent at room temperature and reduced at cryogenic temperatures compared to wrought SS304L, likely due to high dislocation density and nitrogen-stabilized austenite. A jerk flow observed at 4 K is attributed to adiabatic heating from plastic deformation, consistent with the low thermal conductivity. Finite element simulations reveal a short residence time (0.0137 s) for molten material during the LPBF process, with oxide particles forming predominantly through heterogeneous nucleation at the melt pool surface, and uniformly distributed by Marangoni convection. These findings provide key insights into developing LPBF parameters for enhanced mechanical performance of SS304L for cryogenic and ambient temperature applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"209 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elastic liquid metal composite with strain-independent EMI shielding properties","authors":"Zhen Liu, Lulu Liu, Li Guan, Yujie Zhu, Mengmeng Lin, Quanlin Li, Xiaoqin Guo, Zhongyi Wang, Yanghang Lian, Peng Chen, Biao Zhao, Rui Zhang","doi":"10.1016/j.jmst.2024.12.101","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.101","url":null,"abstract":"Stable electrical and electromagnetic interference (EMI) shielding performance is crucial for the development of the new generation of flexible electronic devices, but maintaining stability under strain remains a challenge. This study presents the development of a composite elastomer utilizing eutectic gallium indium (EGaIn), characterized by its high flexibility in circuit design, excellent conductivity, minimal resistance variation, and consistent EMI shielding effectiveness under high strain conditions. The composite is engineered through the deposition of EGaIn particles within the lower layer of polydimethylsiloxane (PDMS), followed by the self-encapsulation of the upper PDMS layer. The robust electrical and EMI shielding properties of the PDMS/EGaIn composite elastomers under strain can be attributed to the internally formed defect-free liquid metal (LM) network. Furthermore, the composite elastomer's versatile circuit inscription capability on its surface, coupled with its resistance independence from the stress direction, underscores its functional versatility in electronic applications. Elastomers with exceptional stretch and strength hold great promise for applications in combat robotics and aerospace apparel. This biomimetic elastomer exhibits vast potential across diverse domains, including flexible electronics, flexible electromagnetic concealment, and aerospace technologies.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"35 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143677895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modulating cell stiffness to improve macrophage antibacterial defense: Utilizing spermidine-functionalized black phosphorus nanosheets for periodontitis treatment","authors":"Runze Li, Yunyang Lu, Weidong Du, Jie Wu, Yi He, Lejia Zhang, Leyi Liu, Kechen Li, Weijie Zhuang, Siyuan Huang, Zijun Wang, Wei Zhao, Xuenong Zou, Weicai Wang, Dongsheng Yu","doi":"10.1016/j.jmst.2025.02.032","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.02.032","url":null,"abstract":"Periodontitis, a prevalent microbe-driven disease, is characterized by the progressive destruction of tooth-supporting tissues. <em>Porphyromonas gingivalis</em> (<em>P.gingivalis</em>), a keystone pathogen in chronic periodontitis, evades clearance by periodontal immune cells, leading to microbial dysbiosis and alveolar bone resorption. Effective treatment requires the elimination of periodontopathogens and restoration of alveolar bone. Macrophages serve as the primary defense against periodontal pathogens. Cell stiffness, an intrinsic mechanical property of macrophage, is closely linked to their motility, deformability, and phagocytic function, presenting a potential target for enhancing macrophage antibacterial activities. Black phosphorus nanosheets (BPNS), a novel two-dimensional material that degrades into nontoxic phosphate in physiological environments, offer distinct advantages in bone regeneration. In this study, BPNS was functionalized with spermidine (Spd), a natural polyamine with immunomodulatory effects, to improve periodontal infection control. In addition to preserving BPNS's osteogenic activity, BPNS@Spd further enhanced macrophage antibacterial function by targeting cell stiffness. Reduced cell stiffness enhanced macrophage deformability and membrane fluidity, facilitating more efficient phagocytosis and clearance of <em>P.gingivalis</em>. Mechanistically, BPNS@Spd modulated macrophage stiffness and function by decreasing membrane cholesterol content, in which autophagy-mediated cholesterol efflux plays a critical role. This work underscores the potential of modulating membrane cholesterol and cell stiffness to boost macrophage-mediated bacterial clearance, offering an innovative immunomodulatory approach for managing microbe-driven inflammatory diseases beyond periodontitis.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"47 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143677747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure evolution during superelastic cycles and related elastocaloric effect in N-doped Ti-based shape memory alloys","authors":"Xuejie Zhu, Xuexi Zhang, Mingfang Qian, Lin Geng","doi":"10.1016/j.jmst.2025.01.054","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.01.054","url":null,"abstract":"The superelasticity and elastocaloric effect (eCE) in N-free Ti-Nb-Zr-Ta alloy and 0.6N(at.%)-doped Ti-Nb-Zr-Ta alloy were comparatively studied. It was found that nitrogen doping played roles in elevating β→α transition temperature, refining grain sizes, homogenizing microstructure and altering dominant texture index. The N-free Ti-Nb-Zr-Ta alloy exhibited a temperature change of +6.7/−6.5 K during loading/unloading processes in the first superelastic cycle, but gradually decreased to +5.7/−5.2 K in 200^th cycle owing to the accumulation of newly codirectional dislocation lines and the following single-system dislocation slip during cyclic tests. By contrast, the N-doped alloy showed a lower initial temperature change of +3.7/−3.1 K but increased to +4.6/−4.1 K in 200^th cycle due to the extra caloric effect generated from nanoscale O' phase to α'' phase which experienced reorientation to favorable variants in early cycles. Residual α'' phase laths derived from stress-induced martensitic transformation (SIMT) appeared in both alloys after tensile cycles. The phase interface between β and α’’ phase was determined to behave a terraced shape, a type of interface compromising the reversible martensitic transformation (MT) and stabilization of martensite phase. The amount of nanodomains (O' phase) in regions situated at a distance from martensite significantly increased after cycles in both alloys, which accounted for the quickly reached stable superelastic deformation and much narrower hysteresis after the first cycle. Therefore, in light of the reproducibility and reversibility of elastocaloric performance in practical application, N-doped β-Ti shape memory alloys (SMAs) are promising candidate materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"70 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143675422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}