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Sn4+-modified Ti-rich CaCu3Ti4.5O12 ceramics with low loss and X8R-Grade thermal stability prepared by polymer pyrolysis 采用聚合物热解法制备低损耗、x8r级热稳定性的Sn4+改性富ti CaCu3Ti4.5O12陶瓷
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-18 DOI: 10.1016/j.jsamd.2025.101086
Ekaphan Swatsitang , Sasitorn Putjuso , Anuchit Hunyek , Thanin Putjuso
Sn4+ substitution at the Ti sites of CaCu3Ti4.5O12 ceramics was successfully achieved via a polymer pyrolysis technique. The effects of Sn4+ incorporation on the dielectric and nonlinear electrical properties were systematically examined. XRD and FE-SEM analyses confirmed the coexistence of CaCu3Ti4O12 and TiO2 phases with refined grains and uniformly dispersed secondary phases, while EDXS mapping revealed suppressed CuO segregation together with enhanced TiO2 homogeneity along grain boundaries. Consequently, the CaCu3Ti4.3Sn0.2O12 ceramic sintered at 1060 °C for 6 h exhibited a high permittivity (ε′ ≈ 7.45 × 103) and ultralow dielectric loss (tan δ = 0.027 at 1 kHz, 30 °C), together with excellent temperature stability (Δε' < ±15 % from −60 to 150 °C), meeting the X8R capacitor standard. Nonlinear J–E analysis revealed a significant enhancement in α (≈35.9) and Eb (≈1.32 × 104 V cm−1), suitable for varistor applications. The improved dielectric and nonlinear responses stemmed from increased grain-boundary resistance (Rgb ≈ 224.1 kΩ cm) and higher barrier height (ΦB ≈ 1.15 eV), both induced by Sn4+ substitution and microstructural refinement. XANES results revealed a slight Ti4+ → Ti3+ reduction, enhancing small-polaron hopping in semiconducting grains and maintaining strong grain-boundary insulation, which together shape the dielectric and nonlinear behaviors. These synergistic effects enable high stability, low loss, and strong non-Ohmic performance, positioning Sn-doped CaCu3Ti4+xO12 ceramics as promising candidates for next-generation capacitor–varistor integration.
通过聚合物热解技术成功地实现了cuu3ti4.5 o12陶瓷中Ti位Sn4+的取代。系统考察了Sn4+掺入对材料介电性能和非线性电学性能的影响。XRD和FE-SEM分析证实了CaCu3Ti4O12和TiO2相共存,晶粒细化,二次相均匀分散,EDXS图谱显示CuO偏析受到抑制,TiO2沿晶界均匀性增强。结果表明,在1060℃下烧结6 h的cacu3ti4.3 sn0.2 2o12陶瓷具有高介电常数(ε′≈7.45 × 103)和超低介电损耗(1 kHz, 30℃时tan δ = 0.027),以及优异的温度稳定性(Δε′<;±15%),满足X8R电容器标准。非线性J-E分析显示α(≈35.9)和Eb(≈1.32 × 104 V cm−1)显著增强,适合压敏电阻应用。Sn4+取代和微观结构细化导致晶界电阻(Rgb≈224.1 kΩ cm)和势垒高度(ΦB≈1.15 eV)增加,从而改善了介质和非线性响应。XANES结果显示Ti4+→Ti3+的轻微还原,增强了半导体晶粒中的小极化子跳变,并保持了强的晶界绝缘,这些共同形成了介电和非线性行为。这些协同效应实现了高稳定性、低损耗和强非欧姆性能,使掺锡ccu3ti4 +xO12陶瓷成为下一代电容器-压敏电阻集成的有前途的候选者。
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引用次数: 0
Improved structure and supercapacitor performance by harnessing MoS/ZnS/GO &CNTs Nanospheres 利用MoS/ZnS/GO &CNTs纳米球改善超级电容器的结构和性能
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-17 DOI: 10.1016/j.jsamd.2025.101080
Rabia Khurram , Safia Anjum , Imed Boukhris , Anam Mansoor , Tafruj Ilayas , Mehwish Sattar
The pure MoS, binary ZnS/MoS, and ternary ZnS/MoS/composites incorporated with carbonaceous materials such as SWCNT, MWCNT, and GO nano-composites are synthesized using a hydrothermal technique. The compositions of the pure, binary, and ternary nano-composites are maintained at ratios of 100, 90:10, and 86:10:4, respectively. The XRD analysis confirmed the formation of a hexagonal single-phase structure. The surface morphology revealed well-defined nano-spheres with clear boundaries. Among the prepared materials, the ternary ZnS (86 %)–MoS (10 %)–GO (4 %) composite exhibited excellent electrochemical performance, delivering an average specific capacitance of 1098 F/g at various scan rates. It also demonstrated a high energy density of 1093 Wh/kg and a power density of 9.3 W/kg. A predominant pseudocapacitive charge-storage behavior is observed, with a diffusive contribution of 85.47 % at a scan rate of 5 mV/s, indicating its potential as a promising candidate for advanced energy storage systems. The enhanced electrochemical performance is attributed to the synergistic effect of transition metal sulfides combined with carbonaceous materials.
采用水热法合成了纯MoS、二元ZnS/MoS和三元ZnS/MoS/复合材料与碳质材料(如swcnts、MWCNT和GO)的纳米复合材料。纯纳米复合材料、二元纳米复合材料和三元纳米复合材料的组成比例分别保持在100、90:10和86:10:4。XRD分析证实了六方单相结构的形成。表面形貌显示边界清晰的纳米球。在所制备的材料中,ZnS (86%) -MoS (10%) -GO(4%)三元复合材料表现出优异的电化学性能,在不同扫描速率下的平均比电容为1098 F/g。它还显示了1093 Wh/kg的高能量密度和9.3 W/kg的功率密度。在扫描速率为5 mV/s时,观察到主要的赝电容电荷存储行为,扩散贡献为85.47%,表明其有潜力成为先进储能系统的有希望的候选材料。过渡金属硫化物与碳质材料的协同作用增强了电化学性能。
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引用次数: 0
Polymer matrix composites as radar-absorbent materials in the X-Band: A comprehensive review 高分子基复合材料作为x波段雷达吸波材料的研究进展
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-17 DOI: 10.1016/j.jsamd.2025.101083
Aravind Rajan Ayagara , Subramanyam Vijayasaradhi , Sai Adithya Vanga , Mayur Shriram Kannadkar , André Langlet
Recent advancements in stealth technology have intensified the demand for radar-absorbing materials (RAMs) that combine superior attenuation performance with structural integrity. This review systematically examines carbon-based RAMs, specifically polymer nanocomposites reinforced with carbon-based nanofillers, emphasizing their dual role in enhancing electromagnetic absorption and mechanical performance. This work uniquely integrates the mechanical behavior of these materials, providing a comprehensive understanding of filler dispersion, interfacial interactions, and their influence on dielectric loss and load-bearing capabilities. Comparative analysis across multiple studies highlights how processing routes, filler morphology, and multi-layer configurations affect reflection loss (RL), impedance matching, and bandwidth within the X-band (8.2–12.4 GHz). Hybrid and multilayer systems demonstrate synergistic effects, achieving broadband absorption exceeding 4 GHz with RL values below −40 dB, while maintaining enhanced tensile and flexural strengths at optimal filler loadings. The review further delineates fabrication methods, scaling challenges, and optimization strategies essential for practical implementation. Finally, emerging trends like multifunctional and hybrid nanofillers, lightweight foamed architectures, and surface-functionalized composites are discussed as promising pathways toward durable, scalable, and structurally integrated carbon-based RAMs for next-generation defense and aerospace platforms.
隐身技术的最新进展增加了对雷达吸收材料(RAMs)的需求,这种材料结合了优越的衰减性能和结构完整性。本文系统地研究了碳基RAMs,特别是用碳基纳米填料增强的聚合物纳米复合材料,强调了它们在增强电磁吸收和机械性能方面的双重作用。这项工作独特地整合了这些材料的机械行为,提供了对填料分散,界面相互作用及其对介电损耗和承载能力的影响的全面理解。多项研究的对比分析强调了加工路线、填料形态和多层配置如何影响x波段(8.2-12.4 GHz)内的反射损耗(RL)、阻抗匹配和带宽。混合和多层体系表现出协同效应,实现了超过4 GHz的宽带吸收,RL值低于- 40 dB,同时在最佳填料负载下保持了增强的拉伸和弯曲强度。该综述进一步描述了制造方法、规模挑战和优化策略对实际实施至关重要。最后,讨论了多功能和混合纳米填料、轻质泡沫结构和表面功能化复合材料等新兴趋势,这些趋势是下一代国防和航空航天平台实现耐用、可扩展和结构集成的碳基ram的有希望的途径。
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引用次数: 0
3D printed multiscale resonant labyrinth composite metastructure for enhanced low-frequency microwave absorption 增强低频微波吸收的3D打印多尺度共振迷宫复合元结构
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-16 DOI: 10.1016/j.jsamd.2025.101079
Yubing Duan , Yunfeng Zhao , Hao Xing , Dawei Shen , Zhen Yang
The growing demand for electromagnetic dissipation in electronic and information technologies has prompted continuous innovation in microwave absorbers. However, conventional designs are often based on uniform structures, which face limitations in achieving simultaneous low-frequency and broadband performance due to their limited geometric diversity and synergistic effects. To overcome these challenges, we propose a multiscale resonant labyrinth metastructure that is designed with multiple combinations of cavity dimensions. This metastructure was fabricated via Fused Deposition Modeling (FDM) using a polyether ether ketone/flaky carbonyl iron particles (PEEK/FCIPs) composite. Simulation and experiment have demonstrated that the metastructure synergistically integrates multiple dissipation mechanisms, including quarter-wavelength resonance, multicavity resonance, and edge diffraction. The finally optimized design exhibits an effective absorption bandwidth from 2.04 to 16.02 GHz, with a strong absorption band (below −15 dB) covering 2.49–9.04 GHz at a 10 mm thickness. Experimental results agree well with the simulations, and also reveal excellent angular stability that maintains effective absorption up to 45° for both transverse electric (TE) and transverse magnetic (TM) polarizations. This work provides an innovative structural design strategy to overcome conventional absorption performance limits, particularly in low-frequency absorption, showing significant promise for practical electromagnetic protection applications.
电子和信息技术对电磁耗散的需求日益增长,促使微波吸收器不断创新。然而,传统设计通常基于均匀结构,由于其有限的几何多样性和协同效应,在同时实现低频和宽带性能方面面临限制。为了克服这些挑战,我们提出了一种多尺度谐振迷宫元结构,该结构设计了多种腔尺寸组合。该超结构是用聚醚醚酮/片状羰基铁颗粒(PEEK/ fcip)复合材料通过熔融沉积建模(FDM)制备的。仿真和实验表明,该元结构协同集成了四分之一波长共振、多腔共振和边缘衍射等多种耗散机制。最终优化设计的有效吸收带宽为2.04 ~ 16.02 GHz,其中- 15 dB以下的强吸收波段覆盖2.49 ~ 9.04 GHz,厚度为10 mm。实验结果与模拟结果吻合良好,并且显示出优异的角稳定性,在横向电(TE)和横向磁(TM)极化下都能保持45°的有效吸收。这项工作提供了一种创新的结构设计策略,以克服传统的吸收性能限制,特别是在低频吸收方面,显示出实际电磁保护应用的重大前景。
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引用次数: 0
Tailoring the structural and functional properties of B2O3-PbO2-BaO-CaO-Sm2O3 glass system for potential radiation shielding applications 调整B2O3-PbO2-BaO-CaO-Sm2O3玻璃体系的结构和功能特性,用于潜在的辐射屏蔽应用
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-16 DOI: 10.1016/j.jsamd.2025.101082
M.I. Sayyed , Mohammad W. Marashdeh , Ashok Kumar , Sabina Yasmin
This study investigates the physical, structural, and radiation shielding properties of a B2O3-PbO2-BaO-CaO-Sm2O3 glass. The density increases (3.953–4.388 g/cm3) with higher BaO and Sm2O3 content due to the incorporation of heavier elements. The molar volume shows non-linear trends attributed to competing effects of Sm3+ ion incorporation and network disruption. The FTIR spectroscopy revealed structural changes. The formation of non-bridging oxygen (NBO) improves with rising Sm2O3 content. The elastic moduli decrease with Sm2O3 content. The mass attenuation coefficients (MAC) are investigated at energies corresponding to those emitted from Eu-152 source using Phy-X software. The MAC at 0.122 MeV was found to range from 1.179 to 1.264 cm2/g. The effective atomic number for 1 S m sample shows a high value of 46.33 at 0.122 MeV. The half value layer for 1 S m sample is 0.149 cm at 0.122 MeV. Among the prepared glasses, the glass with the composition 11PbO2-25BaO-10CaO-50B2O3-4Sm2O3 exhibited the highest MAC.
本研究考察了B2O3-PbO2-BaO-CaO-Sm2O3玻璃的物理、结构和辐射屏蔽性能。随着BaO和Sm2O3含量的增加,合金密度增大(3.953 ~ 4.388 g/cm3)。由于Sm3+离子掺入和网络破坏的竞争作用,摩尔体积呈现非线性趋势。FTIR光谱显示了结构变化。随着Sm2O3含量的增加,非桥氧(NBO)的生成增多。弹性模量随Sm2O3含量的增加而减小。利用Phy-X软件研究了与eu152源发射能量对应的质量衰减系数(MAC)。0.122 MeV时的MAC值为1.179 ~ 1.264 cm2/g。在0.122 MeV下,1 S m样品的有效原子序数达到46.33。在0.122 MeV下,1 S m样品的半值层为0.149 cm。在所制备的玻璃中,组分为11PbO2-25BaO-10CaO-50B2O3-4Sm2O3的玻璃的MAC值最高。
{"title":"Tailoring the structural and functional properties of B2O3-PbO2-BaO-CaO-Sm2O3 glass system for potential radiation shielding applications","authors":"M.I. Sayyed ,&nbsp;Mohammad W. Marashdeh ,&nbsp;Ashok Kumar ,&nbsp;Sabina Yasmin","doi":"10.1016/j.jsamd.2025.101082","DOIUrl":"10.1016/j.jsamd.2025.101082","url":null,"abstract":"<div><div>This study investigates the physical, structural, and radiation shielding properties of a B<sub>2</sub>O<sub>3</sub>-PbO<sub>2</sub>-BaO-CaO-Sm<sub>2</sub>O<sub>3</sub> glass. The density increases (3.953–4.388 g/cm<sup>3</sup>) with higher BaO and Sm<sub>2</sub>O<sub>3</sub> content due to the incorporation of heavier elements. The molar volume shows non-linear trends attributed to competing effects of Sm<sup>3+</sup> ion incorporation and network disruption. The FTIR spectroscopy revealed structural changes. The formation of non-bridging oxygen (NBO) improves with rising Sm<sub>2</sub>O<sub>3</sub> content. The elastic moduli decrease with Sm<sub>2</sub>O<sub>3</sub> content. The mass attenuation coefficients (MAC) are investigated at energies corresponding to those emitted from Eu-152 source using Phy-X software. The MAC at 0.122 MeV was found to range from 1.179 to 1.264 cm<sup>2</sup>/g. The effective atomic number for 1 S m sample shows a high value of 46.33 at 0.122 MeV. The half value layer for 1 S m sample is 0.149 cm at 0.122 MeV. Among the prepared glasses, the glass with the composition 11PbO<sub>2</sub>-25BaO-10CaO-50B<sub>2</sub>O<sub>3</sub>-4Sm<sub>2</sub>O<sub>3</sub> exhibited the highest MAC.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"11 1","pages":"Article 101082"},"PeriodicalIF":6.8,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and performance evaluation of a multi-band metamaterial absorber for oil quality sensing 油质传感用多波段超材料吸收器的设计与性能评价
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-16 DOI: 10.1016/j.jsamd.2025.101081
Ahmed Alzamil , Muhammad Amir Khalil , Wong Hin Yong , Abdulmajeed M. Alenezi , Mohamad A. Alawad , Abdulwadoud A. Maash , Mohamed S. Soliman , Riaz Hussain , Mohammad Tariqul Islam
This study presents a highly efficient metamaterial (MTM) absorber designed for precise sensing applications, particularly for distinguishing edible oils based on their dielectric properties. Utilising a compact maze-shaped structure comprising a copper resonator and a Rogers 5880 substrate, the absorber achieves near-perfect (> 99 %) absorption efficiency across the 2–5 GHz frequency range. The absorber's geometric parameters were investigated in detail, revealing significant improvements in multi-band performance and resonance tuning with incremental increases in the resonator's complexity. Comprehensive simulations conducted using CST Microwave Studio and validated through equivalent circuit modelling demonstrated strong agreement, establishing a robust design methodology. Experimental verification confirmed the absorber's sensitivity, demonstrating clear differentiation among mustard, coconut, and sunflower oils through distinct resonance-frequency shifts attributable to their dielectric constants. The sensor achieved an exceptional quality factor (Q = 170), high sensitivity (0.85 GHz per dielectric unit), and superior absorption performance, positioning it as a promising candidate for industrial applications in quality control and food safety.
本研究提出了一种高效的超材料(MTM)吸收体,设计用于精确传感应用,特别是根据其介电特性区分食用油。利用紧凑的迷宫形结构,包括铜谐振器和罗杰斯5880衬底,吸收器在2-5 GHz频率范围内实现了近乎完美的吸收效率(> 99%)。对吸收器的几何参数进行了详细的研究,揭示了随着谐振器复杂性的增加,多波段性能和共振调谐有了显著的改善。利用CST微波工作室进行的综合仿真,并通过等效电路建模验证,证明了强有力的一致性,建立了稳健的设计方法。实验验证证实了吸收剂的灵敏度,表明芥末油、椰子油和葵花籽油通过不同的介电常数引起的共振频率偏移有明显的区别。该传感器实现了卓越的质量因子(Q = 170),高灵敏度(每介电单位0.85 GHz)和卓越的吸收性能,使其成为质量控制和食品安全工业应用的有前途的候选者。
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引用次数: 0
Nanoscale optical-regime metamaterial absorber for enhanced photon absorption in thermal emitters 用于增强热发射体中光子吸收的纳米级光态超材料吸收体
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-16 DOI: 10.1016/j.jsamd.2025.101078
Azim Sharkar , Md. Moniruzzaman , N.H.M.A. Azim , Mahjabin Mobarak , Mohamad A. Alawad , Abdulmajeed M. Alenezi , Abdullah Al Mahfazur Rahman , Mohammad Tariqul Islam
This article introduces a nanoscale metamaterial absorber (MMA) with significant photon absorption characteristics for incorporating in thermal emitters intended for solar energy harvesting from the visible spectrum in the optical frequency regime. The proposed MMA unit cell has an electrical dimension of 0.13 λ × 0.13 λ × 0.07 λ, where λ represents the maximum wavelength of the visible spectrum. It comprises a quartz (fused) substrate, a tungsten resonator layer, and a gold backplane. The computational model of the absorber is created utilizing CST Microwave Studio. The proposed MMA can produce an average absorption of 91.27% within the visible wavelength spectrum (375–750 nm), featuring dual absorption maxima of 94.37% and 99.81% at 428.81 nm and 657.89 nm, respectively. The performance of the MMA is further verified through high-frequency simulation software (HFSS) that provides an average absorption of 93.04%, indicating the accuracy of the design. The comprehensive parametric studies are accomplished, and absorption phenomena are analyzed through the current and field distribution. The absorber exhibits an almost zero polarization conversion ratio (PCR) with a maximum of 5.6 × 10−5. Moreover, the absorption spectra are stable for variation in polarization and incident angle up to 90° for transverse electric (TE) and transverse magnetic (TM) modes. The design attains a maximum solar irradiance efficiency of 92.18% facilitating effective photon conversion and reflection reduction. Additionally, a comparison of the presented MMA is made with some recent works, revealing that some other works provide higher absorption bandwidth but expose limited angular stability (≤70°), lower solar irradiance efficiency, and higher dimensions. But the proposed absorber overcomes these constraints by optimizing structural parameters and ensuring wide-band absorption, high incident and polarization angle stability, improved photon conversion efficiency within a compact dimension. Due to its compact dimension, stable absorption performance, and high solar irradiance efficiency, this new MMA can be utilized in thermal emitters for solar energy harvesting applications.
本文介绍了一种具有显著光子吸收特性的纳米级超材料吸收体(MMA),用于从可见光波段收集太阳能的热发射体。所提出的MMA单元电池的电尺寸为0.13 λ × 0.13 λ × 0.07 λ,其中λ表示可见光谱的最大波长。它包括石英(熔融)衬底、钨谐振器层和金背板。利用CST Microwave Studio建立了吸收体的计算模型。在可见波长范围内(375 ~ 750 nm), MMA的平均吸收率为91.27%,在428.81 nm和657.89 nm处的双吸收最大值分别为94.37%和99.81%。通过高频仿真软件(HFSS)进一步验证了MMA的性能,平均吸收为93.04%,表明了设计的准确性。完成了全面的参数研究,并通过电流和场分布分析了吸收现象。吸收剂的极化转化率(PCR)几乎为零,最大值为5.6 × 10−5。此外,横向电(TE)和横向磁(TM)模式的吸收光谱在极化和入射角不超过90°的情况下是稳定的。该设计最大太阳辐照效率为92.18%,有利于有效的光子转换和减少反射。此外,将所提出的MMA与最近的一些研究进行了比较,发现其他一些研究提供了更高的吸收带宽,但暴露了有限的角稳定性(≤70°),较低的太阳辐照效率和更高的维度。但所提出的吸收器通过优化结构参数,确保宽带吸收,高入射角和偏振角稳定性,在紧凑的尺寸内提高光子转换效率,克服了这些限制。由于其尺寸紧凑,吸收性能稳定,太阳辐照效率高,这种新型MMA可以用于太阳能收集应用的热辐射器。
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引用次数: 0
Tailoring anisotropy and mechanical performance of additively manufactured PEKK through annealing and architected design 通过退火和结构设计剪裁增材制造PEKK的各向异性和力学性能
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-11 DOI: 10.1016/j.jsamd.2025.101077
F. Malekpour , M. Hojjati
Processing and post-processing parameters critically determine the structural performance of additively manufactured parts. Poly-ether-ketone-ketone (PEKK), a high-performance thermoplastic, offers considerable promise for aerospace applications. However, its mechanical behavior in material extrusion (MEX) remains constrained by pronounced anisotropy and weak interlayer bonding. Addressing these limitations requires understanding how printing architecture and post-processing jointly influence mechanical response. Therefore, the objective of this study is to evaluate the effectiveness of an optimized annealing protocol, established in our previous work (210 °C for 30 min), in reducing anisotropic behavior and enhancing mechanical performance across different raster orientations and architected structures. Tensile and flexural coupons were fabricated at raster angles of 0°, ±45°, and 90° using three infill patterns (line, concentric, and mixed) and tested before and after annealing. Additionally, compressive coupons of Schwarz G and Schwarz P lattices with 40 % relative density were examined to represent structural architected geometries, tested both parallel and perpendicular to the print-layer direction. Results show that reinforcement by annealing is pattern-dependent. At the maximum reinforcement, concentric infill yielded the greatest tensile strength improvement (29.5 %), whereas the 90° raster exhibited the largest flexural strength gain (17.6 %). For structural lattices, compressive strength increased by 37.5 % in Schwarz G, while a reduction of 18.6 % was observed in Schwarz P. While annealing enhanced stiffness, strength, and thermal stability, it also introduced dimensional changes and occasional void-related defects. Overall, this study demonstrates the interplay between anisotropic printing architecture and post-processing, providing pathways to tailor PEKK components for aerospace and structural applications requiring either superior strength (annealed) or enhanced toughness (as-printed).
加工和后处理参数决定了增材制造零件的结构性能。聚醚酮酮(PEKK)是一种高性能热塑性塑料,在航空航天应用中具有相当大的前景。然而,其在材料挤压中的力学行为仍然受到明显的各向异性和弱层间键合的限制。解决这些限制需要了解印刷结构和后处理如何共同影响机械响应。因此,本研究的目的是评估在我们之前的工作中建立的优化退火方案(210°C 30分钟)在减少各向异性行为和提高不同光栅取向和结构的机械性能方面的有效性。在0°,±45°和90°的光栅角度下,使用三种填充模式(线形,同心和混合)制作拉伸和弯曲票,并在退火前和退火后进行测试。此外,研究人员还检测了相对密度为40%的Schwarz G和Schwarz P晶格的压缩面,以代表结构几何形状,并对平行和垂直于打印层方向进行了测试。结果表明,退火强化具有图案依赖性。在最大钢筋强度下,同心填充的抗拉强度提高幅度最大(29.5%),而90°栅格的抗折强度提高幅度最大(17.6%)。对于结构晶格,在Schwarz G中,抗压强度增加了37.5%,而在Schwarz p中,抗压强度降低了18.6%。虽然退火提高了刚度、强度和热稳定性,但它也引入了尺寸变化和偶尔的空洞相关缺陷。总体而言,本研究展示了各向异性打印结构和后处理之间的相互作用,为航空航天和结构应用提供了定制PEKK组件的途径,这些组件需要更高的强度(退火)或增强的韧性(打印)。
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引用次数: 0
Enhanced efficiency of blade-coated polymer solar cells via Eu3+/Tb3+-induced nanoaggregates of PS-b-PAA 利用Eu3+/Tb3+诱导PS-b-PAA纳米聚集体提高叶片包覆聚合物太阳能电池效率
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-05 DOI: 10.1016/j.jsamd.2025.101066
Shuxin Li , Wenfei Shen , Shuhan Guo , Yanliang Yue , Yao Wang , Hao Fu , Qiao Wang , Matt J. Kipper , Christopher D. Snow , Soo Wohn Lee , Laurence A. Belfiore , Jianguo Tang
Considered a pivotal advancement for commercial applications, blade coating technology for large area photovoltaic devices has emerged as a forefront research area in the field of polymer solar cells (PSCs). Herein, a high-performance PM6:L8-BO device is fabricated with the blade-coating method in ambient air. Meanwhile, Eu3+-induced diblock polymer aggregates (EIPAs) and Tb3+-induced diblock polymer aggregates (TIPAs) with excellent fluorescent properties were synthesized through self-assembly and incorporated as an additive into the PM6:L8-BO system to increase the ultraviolet light absorption and enhance BC-PSC light harvesting. By employing this strategy, the blade-coating device's power conversion efficiency (PCE) was improved from 12.25 % to 13.63 %, and the relative efficiency was enhanced by 11.3 %. In addition to the performance improvement, the stability of the devices was also enhanced by 19 %, indicating the effectiveness of this approach in producing more efficient and durable PSCs.
大面积光伏器件叶片涂层技术被认为是商业应用的关键进步,已成为聚合物太阳能电池(PSCs)领域的研究前沿。本文采用叶片包覆法在环境空气中制备了高性能PM6:L8-BO器件。同时,通过自组装合成了具有优异荧光性能的Eu3+诱导双嵌段聚合物聚集体(EIPAs)和Tb3+诱导双嵌段聚合物聚集体(TIPAs),并将其作为添加剂加入PM6:L8-BO体系中,增加了对紫外光的吸收,增强了BC-PSC的光收获。采用该策略后,叶片包覆装置的功率转换效率(PCE)由12.25%提高到13.63%,相对效率提高11.3%。除了性能的提高,器件的稳定性也提高了19%,表明这种方法在生产更高效、更耐用的psc方面是有效的。
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引用次数: 0
Janus XYTe2 monolayers and GaInTe2 bilayer: promising materials for photocatalytic water splitting - a first-principles study Janus XYTe2单层和GaInTe2双分子层:光催化水分解的有前途的材料-第一性原理研究
IF 6.8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2025-12-05 DOI: 10.1016/j.jsamd.2025.101065
Gang Guo , Yongcheng Chen , Gencai Guo
The quest for efficient photocatalysts for solar-driven water splitting is paramount for advancing clean hydrogen energy. Here, we systematically investigate a novel family of 2D Janus XYTe2 (X = Al, Ga; Y=Ga, In; X≠Y) monolayers and bilayer GaInTe2, using first-principles calculations. Our investigations reveal that the designed monolayers possess robust dynamic, thermal, and mechanical stability. They possess suitable band gaps (1.88–2.46 eV), high visible-light absorption coefficients, and appropriate band edge alignment for photocatalytic water splitting. Notably, GaInTe2 monolayer achieves a high solar-to-hydrogen (STH) efficiency of ∼21.5 %. More strikingly, stacking GaInTe2 into a bilayer with an AB2 configuration dramatically enhances its performance. The bilayer exhibits a reduced bandgap (1.36 eV), significantly boosted optical absorption across the visible spectrum, and achieves an ultrahigh theoretical STH efficiency of 42.21 %. Furthermore, Gibbs free energy change calculations provide evidence for the thermodynamic accessibility of the HER in these systems. The outcomes of our analysis establish the Janus XYTe2 family, with special emphasis on the AB2-stacked GaInTe2 bilayer, as an exceptional system for pioneering next-generation solar energy conversion.
为太阳能驱动的水分解寻找高效的光催化剂对于推进清洁氢能源至关重要。在这里,我们系统地研究了一类新的二维Janus XYTe2 (X = Al, Ga; Y=Ga, In; X≠Y)单层和双层GaInTe2,使用第一性原理计算。我们的研究表明,设计的单层具有强大的动态,热稳定性和机械稳定性。它们具有合适的带隙(1.88-2.46 eV)、高可见光吸收系数和适合光催化水分解的带边排列。值得注意的是,GaInTe2单层膜实现了高达21.5%的太阳能制氢(STH)效率。更引人注目的是,将GaInTe2堆叠成具有AB2结构的双层结构可以显著提高其性能。该双分子层的带隙减小了(1.36 eV),显著提高了可见光光谱的光吸收,并实现了42.21%的超高理论效率。此外,Gibbs自由能变化计算为这些体系中HER的热力学可及性提供了证据。我们的分析结果建立了Janus XYTe2家族,特别强调ab2堆叠的GaInTe2双分子层,作为开拓下一代太阳能转换的特殊系统。
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Journal of Science: Advanced Materials and Devices
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