Materials & Design最新文献_第5页

Enhanced strain mapping Unveils internal deformation dynamics in Silicon-based lithium-ion batteries during electrochemical cycling 增强应变绘图揭示了硅基锂离子电池在电化学循环过程中的内部变形动态

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-11-01 DOI: 10.1016/j.matdes.2024.113404

Bowen Wang , Kaiyuan Xue , Li Xi, Haosen Chen, Jiawei Wen, Chaojie Ma, Ying Li

Silicon-based anodes have emerged as a promising advancement in lithium-ion battery technology, offering significantly higher lithium storage capacities than traditional graphite. However, the volumetric expansion of silicon-anodes can swell by up to 300 % during lithiation-presents serious challenges to their structural integrity and electrochemical stability. This study investigates the internal structural dynamics of silicon anodes during lithiation and delithiation cycles. A novel cell design for a 18,650 cylindrical cell featuring micro-sized internal speckles within the silicon anode is presented. This design improves the simulation of electrochemical conditions and allows for precise displacement tracking, mitigating impacts on capacity and cycle performance while enhancing Digital Volume Correlation (DVC) analysis. The research prioritizes reducing scan time and radiation exposure in micro-CT assessments of Li-ion cells, and improves the accuracy of internal strain mapping via DVC. Displacement fields over three charging and discharging cycles are documented. Notably, uneven volumetric changes are observed, with local displacements reaching up to 35 µm in areas smaller than 2.5 mm in radius, which contracted during charging and expanded during discharging. This protocol offers insights into the relationship between electrode mechanics and cell performance, promoting non-destructive evaluations of internal structures in commercial cells.

硅基阳极是锂离子电池技术中一项前景广阔的进步，其锂存储容量大大高于传统石墨。然而，硅负极在锂化过程中体积膨胀高达 300%，这对其结构完整性和电化学稳定性提出了严峻挑战。本研究调查了硅阳极在锂化和脱锂循环过程中的内部结构动态。研究提出了一种新颖的 18650 圆柱形电池设计，其特点是硅阳极内部有微小的斑点。这种设计改进了电化学条件的模拟，实现了精确的位移跟踪，减轻了对容量和循环性能的影响，同时增强了数字体积相关性（DVC）分析。这项研究的重点是减少锂离子电池微型 CT 评估的扫描时间和辐射暴露，并通过 DVC 提高内部应变映射的准确性。研究记录了三个充电和放电周期的位移场。值得注意的是，观察到了不均匀的体积变化，半径小于 2.5 毫米的区域局部位移高达 35 微米，这些区域在充电时收缩，在放电时扩张。该方案有助于深入了解电极力学与电池性能之间的关系，促进对商用电池内部结构的非破坏性评估。

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引用次数: 0

Dispersoid evolution in Al–Zn–Mg alloys by combined addition of Hf and Zr: A mechanistic approach 通过联合添加 Hf 和 Zr 实现 Al-Zn-Mg 合金中的分散演变：力学方法

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-11-01 DOI: 10.1016/j.matdes.2024.113366

V. Wessely , U. Töpfer , I. Basu , R.E. Schäublin , S. Pogatscher , P.J. Uggowitzer , J.F. Löffler

Coherent Al₃X-type L1₂-structured dispersoids have the potential of effectively stabilizing the grain structure and increasing strength. This concept has been successfully demonstrated for non-hardenable and rapidly solidified Al alloys. In precipitation-hardened Al alloys, effective dispersoid addition requires both controlling their high-temperature stability and minimizing their impact on precipitation hardening. The current study focuses on dispersoid-modified AlZn5.0Mg1.2 alloys, which exhibit MgZn precipitation upon age-hardening and include less than 1 wt% of Zr and Hf for dispersoid formation. Heat treatments between 350 °C and 500 °C for varying times were applied to evaluate dispersoid formation, thermal stability and the related strengthening potential. The microstructure was assessed using transmission electron microscopy (TEM) and atom probe tomography (APT), and the mechanical response was evaluated by hardness testing. TEM after heating at 500 °C reveals Ostwald ripening for the dispersoids. APT results on the dispersoids reveal a core–shell structure development upon longer annealing times. The Zr–Hf-modified alloy exhibits a higher initial strength than the Zr-modified alloy but the latter displays greater strength retention even after prolonged exposure to 500 °C. This effect is attributed to a destabilization of the mixed Zr–Hf dispersoids that arises from lower enthalpic benefits of Al₃Hf formation over Al₃Zr.

连贯的 Al3X 型 L12 结构分散体具有有效稳定晶粒结构和提高强度的潜力。这一概念已在非硬化和快速凝固铝合金中得到成功验证。在沉淀硬化铝合金中，要有效添加分散体，既要控制其高温稳定性，又要尽量减少其对沉淀硬化的影响。目前的研究重点是分散体改性的 AlZn5.0Mg1.2 合金，这种合金在时效硬化时会出现 MgZn 沉淀，并且在形成分散体时 Zr 和 Hf 的含量低于 1 wt%。在 350 °C 和 500 °C 之间进行不同时间的热处理，以评估分散体的形成、热稳定性和相关的强化潜力。使用透射电子显微镜（TEM）和原子探针断层扫描（APT）评估了微观结构，并通过硬度测试评估了机械响应。在 500 °C 下加热后的 TEM 显示了分散体的奥斯特瓦尔德熟化过程。关于分散体的 APT 结果显示，退火时间越长，核壳结构越发达。与 Zr 改性合金相比，Zr-Hf 改性合金的初始强度更高，但后者即使长时间暴露在 500 ℃ 下也能保持更高的强度。这种效应归因于混合 Zr-Hf 分散体的不稳定性，而这种不稳定性是由于 Al3Hf 形成的焓值低于 Al3Zr 形成的焓值。

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引用次数: 0

Effect of porosity on the tensile strength and Micromechanisms of laminated stitched C/C-SiC composites 孔隙率对层压缝合 C/C-SiC 复合材料拉伸强度和微观机理的影响

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-11-01 DOI: 10.1016/j.matdes.2024.113429

Zhuoyu Song , Kaiyin Xiao , Shijian Xiao , Kaifan Du , Zebei Mao , Tong Li , Bo Wang

This study examines how pore defects affect the tensile strength of laminated stitched carbon fiber reinforced carbon and silicon carbide (C/C-SiC) composites. Using computed tomography (CT) technology, internal characteristic parameters were obtained, and a representative volume cell contains pore (RVC-CP) defects was established. The homogenization method and strength estimation technique were applied to connect material properties from the microscopic to the mesoscopic scale. Progressive damage analysis of the representative volume cell (RVC) yielded tensile strength results within 2% of the average tensile test measurements, validating finite element models for strength prediction. The study found that pores create stress concentrations, leading to the failure of transverse and longitudinal fiber bundles, as well as the matrix. Additionally, it was observed that 8.9% pore content results in a 27.2% reduction in tensile strength compared to non-porous material. Based on these findings, empirical formulas for predicting tensile strength reduction due to pores are proposed. This paper presents a mesoscale computational model with pores that enhances the efficiency and accuracy of strength design for stitched C/C-SiC materials. In engineering, the model can be combined with non-destructive testing to quickly assess local strength reduction, offering valuable insights for designing C/C-SiC materials in aircraft and high-speed trains.

本研究探讨了孔隙缺陷如何影响层压缝合碳纤维增强碳化硅（C/C-SiC）复合材料的拉伸强度。利用计算机断层扫描（CT）技术获得了内部特征参数，并建立了包含孔隙缺陷的代表性体积单元（RVC-CP）。应用均质化方法和强度估算技术将材料特性从微观尺度连接到介观尺度。代表体积单元（RVC）的渐进损伤分析得出的拉伸强度结果在平均拉伸试验测量值的 2% 以内，验证了用于强度预测的有限元模型。研究发现，孔隙会产生应力集中，导致横向和纵向纤维束以及基体失效。此外，研究还发现，与无孔材料相比，8.9% 的孔隙含量会导致拉伸强度降低 27.2%。根据这些发现，提出了预测孔隙导致拉伸强度降低的经验公式。本文提出了一种带孔隙的中尺度计算模型，可提高 C/C-SiC 缝合材料强度设计的效率和准确性。在工程设计中，该模型可与无损检测相结合，快速评估局部强度降低情况，为飞机和高速列车中 C/C-SiC 材料的设计提供有价值的见解。

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引用次数: 0

New insights into the kinetics of dynamic and post-dynamic softening in Alloy 718 engine disks 对合金 718 发动机盘动态软化和后动态软化动力学的新认识

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-11-01 DOI: 10.1016/j.matdes.2024.113423

E. Farabi , V.V. Rielli , F. Godor , C. Gruber , A. Stanojevic , B. Oberwinkler , S. Primig

The dynamic and post-dynamic recrystallisation (DRX and PDRX) kinetics of Alloy 718 are known to be dependent on the strain rate, deformation temperature, and the fraction of the δ-phase in the heterogeneous starting materials. Better control of these regimes is required for direct ageing (DA), to unlock superior high-temperature strength in next-generation aeroengine disks. There are gaps in the current understanding of the (post-)dynamic regime and its effect on γʹ and γʹʹ co-precipitation. Our aim is to reveal the critical parameters controlling the grain size and recrystallised fractions after thermo-mechanical processing (TMP) to model the post-dynamic microstructure evolution.

Two initial microstructures with different δ-phase fractions are subjected to 1.4 strain with 0.1–10 s⁻¹ strain rates to simulate industrial conditions. A short isothermal ost-deformation annealing is applied to assess the restoration behaviour. DRX is suppressed at strain rates >1 s⁻¹ at 950 °C due to limited time for dynamic restoration, while PDRX become predominant due to higher stored energy. At 1000 °C, a fully recrystallised microstructure is achieved in all conditions. The presence of δ-phase increases DRX and PDRX rates and promotes microstructure stability. Our results are underpinned by models that predict PDRX and precipitation kinetics during DA.

众所周知，合金 718 的动态和动态后再结晶（DRX 和 PDRX）动力学取决于应变速率、变形温度以及异质起始材料中 δ 相的比例。直接老化（DA）需要更好地控制这些机制，以释放下一代航空发动机盘片的高温强度。目前对（后）动态机制及其对γʹ和γʹ共沉淀的影响的认识还存在差距。我们的目的是揭示控制热机械加工（TMP）后晶粒大小和再结晶分数的关键参数，以模拟后动态微结构演变。采用短暂的等温奥氏变形退火来评估恢复行为。由于动态恢复时间有限，在 950 °C 时，应变速率为 1 s-1 时，DRX 被抑制，而由于存储能量较高，PDRX 占主导地位。1000 °C时，在所有条件下都能获得完全再结晶的微观结构。δ相的存在提高了 DRX 和 PDRX 的速率，并促进了微观结构的稳定性。我们的研究结果以预测 DA 过程中 PDRX 和沉淀动力学的模型为基础。

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引用次数: 0

Microstructure evolution and hydrogen absorption characteristics of gradient-hydrogenated Ti-4.5Al-3V-2Mo-2Fe alloys 梯度氢化 Ti-4.5Al-3V-2Mo-2Fe 合金的微观结构演变和吸氢特性

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-11-01 DOI: 10.1016/j.matdes.2024.113436

Jinyuan Zhang , Shaosong Jiang , Yong Jia , Peng Peng , Yang Li , Shang Yang , Zhen Lu

Ti-4.5Al-3V-2Mo-2Fe rolled material is a dual-phase titanium alloy with an average grain size of less than 3 μm; its optimal superplastic forming temperature of 760 °C is at least 50 °C lower than the temperature required for diffusion bonding, making it challenging to carry out superplastic forming/diffusion bonding within a process window. The promotion of hydrogen on the low-temperature diffusion bonding of the alloy was verified through thermohydrogen processing, and the absorption characteristics of hydrogen in the alloy at various temperatures, holding times, and pressures were investigated. Subsequently, a mathematical model for achieving standardized hydrogen content was developed. X-ray polycrystalline diffractometer (XRD) analysis was utilized to preliminarily explore phase differences in samples with varying levels of hydrogen content. Furthermore, scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron back scatter diffraction (EBSD) and time of flight secondary ion mass spectrometry (TOF-SIMS) were employed to analyze microstructure changes and hydrogen distribution in both the surface and core regions of the titanium alloy following hydrogenation, demonstrating its feasibility for surface hydrogenation treatment of titanium alloy sheets.

Ti-4.5Al-3V-2Mo-2Fe 轧制材料是一种平均晶粒尺寸小于 3 μm 的双相钛合金；其最佳超塑性成形温度为 760 °C，比扩散结合所需的温度至少低 50 °C，因此在工艺窗口内进行超塑性成形/扩散结合具有挑战性。通过热氢加工验证了氢对合金低温扩散结合的促进作用，并研究了合金在不同温度、保温时间和压力下的吸氢特性。随后，建立了实现标准化氢含量的数学模型。利用 X 射线多晶衍射仪 (XRD) 分析初步探讨了不同氢含量样品的相位差。此外，还利用扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、电子背散射衍射 (EBSD) 和飞行时间二次离子质谱 (TOF-SIMS) 分析了氢化后钛合金表面和核心区域的微观结构变化和氢分布，证明了其用于钛合金板材表面氢化处理的可行性。

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引用次数: 0

Balancing the strength and toughness in delignified bamboo through the changing of silicon composition 通过改变硅成分平衡脱木素竹材的强度和韧性

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-11-01 DOI: 10.1016/j.matdes.2024.113408

You Wang , Shuyu Jia , Zhe Ling , Jianfeng Ma , Xinxin Ma , Changhua Fang

The partial removal of lignin from bamboo materials, a prevalent method to soften the material for plastic forming. It increases bending toughness and improves forming quality, albeit at the expense of load-bearing capacity. This study employs an innovative approach using deep eutectic solvent pretreatment on bamboo green strips (BGS) to establish a balance between strength and toughness, resulting in a significant enhancement of the elastic modulus. The mechanical properties of the DES-treated BGS displayed notable improvements compared to bamboo timber strips (BTS) and bamboo yellow strips (BYS), which either showed no enhancement or suffered degradation after extended treatment durations. Notably, BGS treated for one hour exhibited increases of 8.22 % in flexural toughness and 33.45 % in elastic modulus, while strength diminished by a mere 5.72 %. Concurrently, its porosity increased by 29.36 %, predominantly in the mesopore range. In addition, the crystallinity of the treated BGS increased, whereas the grain size decreased. Silicon-aluminum compounds form on the outer surface of BGS, along with an increase in silicon oxide content, contributed to the observed improvements in stiffness and toughness. These works suggest a novel method for balancing modulus and strength of bamboo structural units, with potential applications in architecture, furniture and transportation sectors.

部分去除竹材料中的木质素，是一种常用的软化材料以便塑性成型的方法。它能提高弯曲韧性，改善成型质量，但却牺牲了承载能力。本研究采用一种创新方法，利用深共晶溶剂对竹青条（BGS）进行预处理，在强度和韧性之间建立平衡，从而显著提高弹性模量。与竹材条（BTS）和竹黄条（BYS）相比，经过 DES 处理的 BGS 的机械性能有明显改善。值得注意的是，处理一小时后，BGS 的弯曲韧性和弹性模量分别提高了 8.22% 和 33.45%，而强度仅降低了 5.72%。同时，其孔隙率增加了 29.36%，主要集中在中孔范围。此外，经过处理的 BGS 结晶度增加，而晶粒尺寸减小。在 BGS 外表面形成的硅铝化合物，以及氧化硅含量的增加，都有助于提高硬度和韧性。这些研究提出了一种平衡竹结构单元模量和强度的新方法，有望应用于建筑、家具和交通领域。

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引用次数: 0

Multi-physics coupled simulation and experimental investigation of alternating stray current corrosion of buried gas pipeline adjacent to rail transit system 轨道交通系统附近埋地燃气管道交变杂散电流腐蚀的多物理场耦合模拟与实验研究

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-11-01 DOI: 10.1016/j.matdes.2024.113394

Chengtao Wang , Shaoyi Xu , Wei Li , Yuqiao Wang , Guanyi Shen , Shuchen Wang

As the gradual emergence of alternating current (AC) electrified rail transit system in urban areas, buried gas pipeline adjacent to the system will be seriously corroded by induced alternating stray current. These buried gas pipelines are at serious risk of electrochemical corrosion, which leads to safety and environmental threaten. In order to study the distribution of alternating stray current corrosion on pipeline surface on a larger spatial scale, this paper conducted numerical simulation and experimental validation of alternating stray current corrosion of buried gas pipeline. In the numerical simulation model, coupling between different physical fields are realized through the relationship between current density of pipe-to-soil interface, electrolyte, and electrodes. Proposed numerical method based on coupled multi-physics in this paper are in good agreement with experimental results under different influencing factors. A novel evaluation index was proposed to assess the corrosion risk within different zones on the pipeline surface. Results show that corrosion distribution is greatly influenced by spatial interaction between buried pipeline and rail transit system including crossing angle and parallel distance. Besides, alternating stray current corrosion on buried gas pipeline are proved to be both affected by dynamic characteristics due to AC fluctuation and operation mode of locomotive.

随着交流（AC）电气化轨道交通系统在城市地区的逐渐兴起，毗邻该系统的埋地燃气管道将受到感应交流杂散电流的严重腐蚀。这些埋地燃气管道面临着严重的电化学腐蚀风险，从而带来安全和环境威胁。为了在更大的空间尺度上研究交变杂散电流腐蚀在管道表面的分布，本文对埋地燃气管道的交变杂散电流腐蚀进行了数值模拟和实验验证。在数值模拟模型中，通过管道与土壤界面、电解质和电极之间的电流密度关系，实现了不同物理场之间的耦合。本文提出的基于多物理场耦合的数值方法与不同影响因素下的实验结果具有良好的一致性。提出了一种新的评价指标，用于评估管道表面不同区域的腐蚀风险。结果表明，腐蚀分布在很大程度上受到埋地管道与轨道交通系统之间空间相互作用的影响，包括交叉角度和平行距离。此外，埋地燃气管道上的交流杂散电流腐蚀还受到交流波动动态特性和机车运行模式的影响。

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引用次数: 0

Microstructural evolution and 1500 °C oxidation resistance of Mo(Al,Si)2 fabricated via an innovative two-step SHS-SPS technique 通过创新的两步 SHS-SPS 技术制造的 Mo(Al,Si)2 的微结构演化和 1500 °C 抗氧化性

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-10-24 DOI: 10.1016/j.matdes.2024.113397

Nana Zhu , Lu Zhu , Baojing Zhang , Peizhong Feng , Shiheng Li , Philipp V. Kiryukhantsev-Korneev , Evgeny A. Levashov , Xuanru Ren , Xiaohong Wang

An innovative two-step approach of self-propagating high-temperature synthesis (SHS) and spark plasma sintering (SPS) was developed to rapidly fabricate MoSi₂ and Mo(Al,Si)₂ ceramics for high-temperature anti-oxidation applications. The SHS process predominantly promoted the synthesis of high-purity and high-yield MoSi₂ and Mo(Si,Al)₂ phases in the alloyed powders. Subsequently, dense and crack-free MoSi₂ and Mo(Al,Si)₂ ceramics were produced using SPS. 1500 °C oxidation tests of the ceramics (100 h) revealed the formation of a protective SiO₂ oxide layer on the surface of MoSi₂ ceramics, while an Al-Si-O composite glassy oxide layer formed on Mo(Si,Al)₂ ceramics, which exhibited better thermal stability and lower oxygen permeability compared to the single SiO₂ oxide layer. However, an excessive Al content (>0.05 at.%) compromised the oxidation resistance due to the emergence of a Si-depleted Mo₅(Si,Al)₃ layer with inferior oxidation resistance, which was caused by the high-temperature diffusion of Si. Therefore, via this novel two-step SHS-SPS technique compact and crack-free Mo(Si,Al)₂ ceramics can be rapidly synthesized at high temperatures. When trace amount of Al was added (0.05 at.%), Mo(Si_0.95Al_0.05)₂ showed optimum high-temperature oxidation resistance.

研究人员开发了一种创新的自蔓延高温合成（SHS）和火花等离子烧结（SPS）两步法，用于快速制造高温抗氧化用 MoSi2 和 Mo（Al,Si）2 陶瓷。SHS 工艺主要促进了合金粉末中高纯度和高产率 MoSi2 和 Mo(Si,Al)2 相的合成。随后，使用 SPS 生产出了致密无裂纹的 MoSi2 和 Mo(Al,Si)2 陶瓷。陶瓷的 1500 °C 氧化试验（100 小时）表明，MoSi2 陶瓷表面形成了保护性的 SiO2 氧化层，而 Mo（Si,Al）2 陶瓷表面形成了 Al-Si-O 复合玻璃状氧化层，与单一的 SiO2 氧化层相比，这种氧化层具有更好的热稳定性和更低的氧气渗透性。然而，过高的 Al 含量（0.05%）会影响抗氧化性，因为硅的高温扩散会导致出现抗氧化性较差的贫硅 Mo5(Si,Al)3 层。因此，通过这种新型的两步 SHS-SPS 技术，可以在高温下快速合成致密无裂纹的 Mo(Si,Al)2 陶瓷。当添加微量 Al（0.05%）时，Mo(Si0.95Al0.05)2 表现出最佳的高温抗氧化性。

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引用次数: 0

Mesenchymal stem cells derived extracellular vesicles modified PLGA electrospinning nanofibrous scaffolds for corneal and retinal repair 用于角膜和视网膜修复的间充质干细胞衍生细胞外囊泡修饰聚乳酸（PLGA）电纺纳米纤维支架

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-10-24 DOI: 10.1016/j.matdes.2024.113389

Jingfan Wang , Xingxing Wang , Xiying Ma , Ting Pan , Qiang Fu , Xinsheng Li , Jie Lei , Yan Wu , Changlin Xu , Qinyuan Gu , Yuanyuan Fan , Tianhao Xiao , Zhangqi Feng , Ping Xie , Zizhong Hu

Tissue self-renewal is crucial for ocular diseases such as corneal damage and retinal holes. In this study, a novel Poly (lactic-co-glycolic acid) (PLGA) electrospinning nanofibrous scaffold (PLGA^ENS), loaded with mesenchymal stem cells-derived extracellular vesicles (MSC-EVs), was developed to accelerate the healing of the cornea and retina. In-vitro experiments confirmed the supportive properties of PLGA^ENS, demonstrating its ability to promote cellular proliferation, migration, and extension. In the rat corneal alkali burn model and rabbit retinal hole model, MSC-EVs modified PLGA^ENS (PLGA^MSC-EVs) accelerated the restoration of the corneal epithelium and stroma, as well as the closure of retinal holes. Additionally, miR-21-5p was identified as being enriched in MSC-EVs. Mechanistically, miR-21-5p suppressed scar formation by targeting the programmed cell death protein 4 (PDCD4) gene, reducing fibrosis and the expression of collagen-related genes, which helped maintain corneal transparency and retinal integrity. Overall, these findings underscored the potential of PLGA^MSC-EVs in promoting ocular wound healing and suggested a promising new therapeutic strategy for the clinical treatment of corneal damage and retinal holes.

组织自我更新对角膜损伤和视网膜孔等眼部疾病至关重要。本研究开发了一种新型聚（乳酸-共聚乙醇酸）（PLGA）电纺纳米纤维支架（PLGAENS），其中装载了间充质干细胞衍生的细胞外囊泡（MSC-EVs），以加速角膜和视网膜的愈合。体外实验证实了PLGAENS的支持特性，证明了其促进细胞增殖、迁移和延伸的能力。在大鼠角膜碱烧伤模型和兔视网膜孔模型中，间充质干细胞-EVs修饰的PLGAENS（PLGAMSC-EVs）加速了角膜上皮和基质的恢复，以及视网膜孔的闭合。此外，miR-21-5p 在间充质干细胞-EVs 中富集。从机理上讲，miR-21-5p 通过靶向程序性细胞死亡蛋白 4 (PDCD4) 基因抑制了疤痕的形成，减少了纤维化和胶原蛋白相关基因的表达，从而有助于保持角膜的透明度和视网膜的完整性。总之，这些发现强调了PLGAMSC-EVs在促进眼部伤口愈合方面的潜力，并为临床治疗角膜损伤和视网膜破洞提出了一种前景广阔的新治疗策略。

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引用次数: 0

Bayesian-neural-network accelerated design of multispectral-compatible camouflage layer with wide-band microwave absorption, customized infrared emission and visible transparency 贝叶斯神经网络加速设计具有宽带微波吸收、定制红外发射和可见光透明性的多光谱兼容伪装层

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2024-10-24 DOI: 10.1016/j.matdes.2024.113400

Hui-Ting Sun , Jun Wang , Jie Yang , Rui-Chao Zhu , Jie Zhang , Sai Sui , Zhao-Tang Liu , Zun-Tian Chu , Yi-Na Cui , Shao-Bo Qu , Jia-Fu Wang

Metasurfaces with customizable multi-spectrum compatibility have attracted a great deal of attention due to the increasing applications of stealth and camouflage. Compared with single-spectrum and fixed-scene camouflage metasurfaces, a camouflage metasurface with the designability and spectral-independence can adapt to more complex environments. However, this drastically increases the design complexity and time cost of metasurfaces. Here, we propose a method to design multispectral compatible function layer of camouflage which can achieve customizable wideband microwave absorption, visible transparency and selective infrared emission, simultaneously. The design of the camouflage layer is optimized and accelerated by Bayesian-neural network, which can be implemented based on a very limited amount of prior data and can greatly reduce the design complexity and time. To verify our method, an optical-transparent metasurface with digital infrared camouflage and low backward scattering was designed and fabricated. The simulation and experimental results well demonstrate the performance of multispectral compatible camouflage of the metasurface. We further explore the angular stability of the camouflage layer to the incident angle varying from 0 to 60° at microwaves. Our proposed design scheme provides a novel method to design spectrum-individual and devisable metasurfaces, which can be applied to camouflage in complex spectrum background.

随着隐身和伪装应用的不断增加，具有可定制多光谱兼容性的元表面引起了广泛关注。与单光谱和固定场景伪装元表面相比，具有可设计性和光谱独立性的伪装元表面可以适应更复杂的环境。然而，这大大增加了元表面的设计复杂性和时间成本。在这里，我们提出了一种设计多光谱兼容功能伪装层的方法，它可以同时实现可定制的宽带微波吸收、可见光透明和选择性红外发射。贝叶斯神经网络可以在非常有限的先验数据基础上实现伪装层的优化和加速设计，大大降低了设计的复杂度和时间。为了验证我们的方法，我们设计并制造了一种具有数字红外伪装和低后向散射的光学透明元表面。仿真和实验结果很好地证明了元表面的多光谱兼容伪装性能。我们还进一步探讨了伪装层在微波入射角0-60°范围内的角度稳定性。我们提出的设计方案为设计与光谱无关且可设计的元表面提供了一种新方法，可用于复杂光谱背景下的伪装。

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引用次数: 0