Composites Part B: Engineering最新文献_第3页

Interphase mechanics vs chemical compatibility: Generating a deformable PA6-carbon fiber interphase 相间力学与化学相容性：生成可变形的 PA6-碳纤维间相

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-06 DOI: 10.1016/j.compositesb.2024.111915

Sameh Dabees , Ameya Borkar , James D. Randall, Bhagya Dharmasiri, David J. Hayne, Ken Aldren S. Usman, Joselito M. Razal, Žan Simon, Ben Newman, Filip Stojcevski, Jaineel K. Shah, Luke C. Henderson

Good interfacial adhesion is typically correlated to obtaining the best tensile/flexural performance for carbon fibre-reinforced composites. The nature or even presence of the interphase, a localized region around the fibre-matrix junction, is often discussed but notoriously difficult to visualize and characterise. Here, a surface-initiated electro-polymerization approach to covalently graft either polyacrylamide or polygylcidyl methacrylate to the carbon fibres was used. This was followed by continuous melt compounding into the polyamide-6 matrix prior to injection moulding. Analysis via X-ray photoelectron spectroscopy (XPS) coupled with topological/visual study through scanning electron microscopy (SEM), showed distinct surface changes after modification and at the composite fracture surface. Additionally, mechanical (tensile, flexural, and tribological characteristics) and thermal (differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA)) investigations were performed. The results showed that the unmodified CF samples exhibit higher tensile and flexural modulus than the modified CF samples. However, the wear rate has been significantly decreased for modified CF samples. SEM of fractured composite surfaces showcased a clear interphase region surrounding the fibre, highlighting the importance of interphase/interphase mechanics in the design of optimal composite interfaces.

良好的界面粘附性通常与碳纤维增强复合材料获得最佳拉伸/挠曲性能相关。纤维与基体交界处的局部区域--相间层的性质甚至存在情况经常被讨论，但却很难进行可视化和表征。在这里，我们采用了一种表面引发的电聚合方法，将聚丙烯酰胺或甲基丙烯酸缩水甘油酯共价接枝到碳纤维上。随后，在注塑成型前将连续熔融复合到聚酰胺-6 基体中。通过 X 射线光电子能谱（XPS）进行分析，并通过扫描电子显微镜（SEM）进行拓扑/视觉研究，结果表明改性后和复合材料断裂表面发生了明显的表面变化。此外，还进行了机械（拉伸、弯曲和摩擦学特性）和热（差示扫描量热法（DSC）和热重分析（TGA））研究。结果表明，未改性的 CF 样品比改性的 CF 样品具有更高的拉伸和弯曲模量。不过，改性 CF 样品的磨损率明显降低。断裂的复合材料表面的扫描电子显微镜显示纤维周围有明显的相间区域，突出了相间/相间力学在设计最佳复合材料界面中的重要性。

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引用次数: 0

Interfacial property optimization through the co-deployment of MOF-derived nickel phyllosilicate and DOPO: Effective reinforcement and flame retardancy of epoxy resin 通过共同部署 MOF 衍生的硅酸镍和 DOPO 优化界面特性：环氧树脂的有效增强和阻燃性能

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-05 DOI: 10.1016/j.compositesb.2024.111947

Shibin Nie , Zongquan Zhao , Wenli Zhai , Jinian Yang , Hong Zhang , Dongyue Zhao , Jingwen Wang

Epoxy resin (EP) is a versatile material widely employed in diverse fields such as electronic encapsulation, coatings, and adhesives. The optimization of flame-retardant, mechanical and interfacial properties in composites through material modification and compounding represents a prominent research focus within the field of EP. This study presents a novel approach by synthesizing MOF-derived nickel phyllosilicate (K–NiPS) and compounding it with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) into the EP matrix. The incorporation of 5 wt% total K–NiPS and DOPO, with a mass ratio of 2:3, achieves a UL-94 V-0 rating and enhances the limiting oxygen index from 23.5 to 28.8 %. This combination also reduced the peak heat release rate, peak smoke release rate, and total smoke release by 44.6 %, 53.6 %, and 37.8 % respectively. Besides, the interface optimization effect of K–NiPS in collaboration with DOPO improved the tensile strength of EP/2K–NiPS/3DOPO from 77.5 MPa to 94.3 MPa, and the wear rate was only 1.25 × 10⁻⁵ mm³/(N·m), which is 82.2 % lower than that of pure EP. This study will pave the way for the applied interface design of multi-functional EP.

环氧树脂（EP）是一种多功能材料，广泛应用于电子封装、涂料和粘合剂等多个领域。通过材料改性和复合来优化复合材料的阻燃性、机械性能和界面性能是环氧树脂领域的一个突出研究重点。本研究提出了一种新方法，即合成 MOF 衍生的硅酸镍（K-NiPS），并将其与 9,10-二氢-9-氧杂-10-磷菲-10-氧化物（DOPO）复合到 EP 基质中。K-NiPS 和 DOPO 的总重量为 5 wt%，质量比为 2:3，达到了 UL-94 V-0 等级，极限氧指数从 23.5% 提高到 28.8%。这种组合还使峰值热释放率、峰值烟释放率和总烟释放率分别降低了 44.6%、53.6% 和 37.8%。此外，K-NiPS 与 DOPO 的界面优化效应使 EP/2K-NiPS/3DOPO 的抗拉强度从 77.5 MPa 提高到 94.3 MPa，磨损率仅为 1.25 × 10-5 mm3/（N-m），比纯 EP 低 82.2%。这项研究将为多功能 EP 的应用界面设计铺平道路。

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引用次数: 0

Laser powder bed fusion of high-strength crack-free Al7075 alloy with the in-situ formation of TiB2/Al3Ti-reinforced phases and nucleation agents 激光粉末床熔化高强度无裂纹 Al7075 合金，原位形成 TiB2/Al3Ti- 增强相和成核剂

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-05 DOI: 10.1016/j.compositesb.2024.111940

Yanzhen Liang , Quanquan Han , Zhongyang Sui , Zhenhua Zhang , Han Zhang , Heng Gu , Defan Wu , Liqiao Wang , Hanlian Liu , Rossitza Setchi

The existence of solidification cracks caused by columnar grains in precipitation-hardened aluminium alloys limit the applicability of Al7075 components manufactured via laser powder bed fusion (LPBF) additive manufacturing. A novel approach was developed to co-incorporate submicron-sized B and micron-grade Ti6Al4V to eliminate hot cracks and to effectively transform coarse columnar grains into fine equiaxed grains, thus improving the mechanical performance of LPBF-fabricated modified Al7075 material. The grain refinement was mainly attributable to the heterogeneous nucleation promoted by the combination of in-situ-formed L1₂-Al₃Ti and TiB₂ nano-sized phases. After an optimised T6 heat treatment, excellent comprehensive mechanical properties were achieved, with a tensile strength of 460 MPa and an elongation of 13 %. This research provides an efficient and cost-effective path for addressing crack-sensitive metallic materials used for LPBF additive manufacturing processes.

沉淀硬化铝合金中存在由柱状晶粒引起的凝固裂纹，这限制了通过激光粉末床熔融（LPBF）快速成型技术制造的 Al7075 组件的适用性。为了消除热裂纹并有效地将粗大柱状晶粒转化为细小的等轴晶粒，我们开发了一种新方法，将亚微米级的 B 和微米级的 Ti6Al4V 共同结合在一起，从而改善 LPBF 制造的改性 Al7075 材料的机械性能。晶粒细化的主要原因是原位形成的 L12-Al3Ti 和 TiB2 纳米相的组合促进了异质成核。经过优化的 T6 热处理后，获得了优异的综合机械性能，抗拉强度达到 460 兆帕，伸长率为 13%。这项研究为解决 LPBF 快速成型制造工艺中使用的裂纹敏感金属材料提供了一条高效、经济的途径。

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引用次数: 0

hUCMSC-derived exosomes mitigate blood-spinal cord barrier disruption by activating AMPK/mTOR-mediated autophagic flux after acute spinal cord injury 急性脊髓损伤后，源自 hUCMSC 的外泌体通过激活 AMPK/mTOR 介导的自噬通量，缓解血液-脊髓屏障的破坏

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-05 DOI: 10.1016/j.compositesb.2024.111944

Zhiheng Chen , Shengting Wu , Shihao Sheng , Sicheng Wang , Yuxuan Qian , Xin Wang , Fengjie Lu , Qi Han , Xiao Chen , Jiacan Su , Xiaofeng Lian

After spinal cord injury (SCI), the integrity of the blood-spinal cord barrier (BSCB) can be disrupted, leading to the secondary injuries such as inflammatory cell infiltration, neuronal death, and spinal cord hematoma. It is important to maintain the integrity of the BSCB to help restore function following SCI. While some studies have demonstrated the therapeutic effects of exosomes derived from human umbilical cord mesenchymal stem cells (hUCMSC-exos), their role in preserving BSCB integrity remains unclear. In our study, we demonstrated the protective effects of hUCMSC-exos on the BSCB and its mechanism. The results of this study indicate that hUCMSC-exos promote motor function recovery, preserve spinal cord structure, and reduce neuronal loss by inhibiting BSCB leakage following SCI. Experimental investigations conducted in vivo and in vitro have demonstrated that hUCMSC-exos can mitigate the loss of adherens junctions (AJs) and tight junctions (TJs) and stimulate autophagy in spinal cord endothelial cells. The protective effects were also found to be significantly reversed following the inhibition of autophagy using 3-MA. In conclusion, our study demonstrates that hUCMSC-exos protect the integrity of BSCB by promoting the repair of spinal endothelial cells through activation of autophagy, thereby exerting a protective role in SCI.

脊髓损伤（SCI）后，血脊髓屏障（BSCB）的完整性可能会遭到破坏，从而导致炎性细胞浸润、神经元死亡和脊髓血肿等继发性损伤。保持血脊髓屏障的完整性对帮助恢复 SCI 后的功能非常重要。虽然一些研究已经证明了从人脐带间充质干细胞（hUCMSC-exos）中提取的外泌体具有治疗作用，但它们在保持BSCB完整性方面的作用仍不清楚。在我们的研究中，我们证实了 hUCMSC-exos 对 BSCB 的保护作用及其机制。研究结果表明，hUCMSC-exos 可抑制 SCI 后 BSCB 的渗漏，从而促进运动功能的恢复、保护脊髓结构并减少神经元的损失。体内和体外的实验研究表明，hUCMSC-exos 可减轻脊髓内皮细胞粘连接头（AJ）和紧密连接（TJ）的损失，并刺激自噬。研究还发现，使用 3-MA 抑制自噬后，保护作用会明显逆转。总之，我们的研究表明，hUCMSC-exos 可通过激活自噬促进脊髓内皮细胞的修复，从而保护脊髓内皮细胞的完整性，从而在 SCI 中发挥保护作用。

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引用次数: 0

Exploring ultrasonic and resistance welding for thermoplastic composite structures: Process development and application potential 探索热塑性复合材料结构的超声波焊接和电阻焊接：工艺开发和应用潜力

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-05 DOI: 10.1016/j.compositesb.2024.111927

Lars Larsen, Manuel Endrass, Stefan Jarka, Simon Bauer, Maximilian Janek

Thermoplastic composites outperform in aerospace applications compared to thermoset composites due to their weldability, a key advantage. This feature streamlines manufacturing, allowing for precise assembly of complex shapes, reducing costs, and accelerating production. Additionally, it simplifies maintenance, enabling easy repair or replacement of damaged parts, thereby extending vehicle lifespan and minimizing downtime. With exceptional strength-to-weight ratio and resistance to corrosion and fatigue, weldable thermoplastic composites ensure reliable performance in the demanding aerospace environment. Overall, their weldability enhances efficiency, versatility, and safety in aerospace applications. This paper first presents an overview of various welding processes and discusses the special challenges of assembly processes in the aviation industry. This work then focuses from the authors’ perspective with regard to industrializability on the two most promising processes, resistance and ultrasonic welding.

与热固性复合材料相比，热塑性复合材料在航空航天应用中的主要优势在于其可焊性。这一特性可简化制造过程，实现复杂形状的精确装配，降低成本并加快生产。此外，它还简化了维护工作，可以轻松维修或更换损坏的部件，从而延长车辆的使用寿命，最大限度地减少停机时间。可焊接热塑性复合材料具有优异的强度重量比、耐腐蚀性和抗疲劳性，可确保在苛刻的航空航天环境中发挥可靠的性能。总体而言，可焊接热塑性复合材料提高了航空航天应用的效率、多功能性和安全性。本文首先概述了各种焊接工艺，并讨论了航空工业装配工艺所面临的特殊挑战。然后，作者从工业化的角度出发，重点介绍了电阻焊接和超声波焊接这两种最有前途的焊接工艺。

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引用次数: 0

“Janus” PEEK implant with sandwich Mg-containing coating for infected tissue repair 带有夹层含镁涂层的 "Janus "聚醚醚酮植入体，用于感染组织修复

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-05 DOI: 10.1016/j.compositesb.2024.111938

Xingdan Liu , Haifeng Zhang , Ji Tan , Ziyi Lu , Xiaochun Peng , Liping Ouyang , Xuanyong Liu

Having good antibacterial properties and promoting soft and hard tissue repair are the keys to successful implantation of intraosseous transcutaneous. Polyether ether ketone (PEEK) is a class of FDA-approved polymer implants. However, the surface of PEEK is bioinert, which is easy to cause postoperative infection and poor tissue integration. In this study, polypyrrole (Ppy) was polymerized on sulfonated PEEK, Mg₃(PO₄)₂ nanosheets were grown in situ on one side, and polycaprolactone (PCL) was then spun on the surface to form a Janus-like surface on PEEK. The Ppy/Mg₃(PO₄)₂/PCL composite coating could inhibit bacterial adhesion, and the excellent photothermal properties of Ppy/Mg₃(PO₄)₂/PCL and Ppy coatings further promote the removal of bacteria due to the accumulated heat. After the infection was eliminated, the Janus-like surface of modified PEEK switched macrophages to anti-proinflammatory response and promoted both soft and hard tissue repair. The Ppy modified sulfonated PEEK could promote collagen secretion in the soft tissue, while the PCL films on Ppy/Mg₃(PO₄)₂/PCL was densified by temperature response under near-infrared light treatment to close the exposed interface of Mg₃(PO₄)₂ nanosheets that was more conducive to bone repair. In summary, PEEK with Janus-like surface consisting of Ppy/Mg₃(PO₄)₂/PCL and Ppy has multiple biological functions of sequential antibacterial and soft and hard tissue repair, and is a promising candidate material for intraosseous transcutaneous implants.

具有良好的抗菌性能和促进软硬组织修复是成功植入骨内经皮植入物的关键。聚醚醚酮（PEEK）是美国食品和药物管理局批准的一类聚合物植入物。然而，PEEK 的表面具有生物惰性，容易造成术后感染和组织整合不良。在这项研究中，聚吡咯（Ppy）被聚合在磺化 PEEK 上，Mg3(PO4)2 纳米片被原位生长在一侧，然后聚己内酯（PCL）被纺在其表面，从而在 PEEK 上形成一个类似于 Janus 的表面。Ppy/Mg3(PO4)2/PCL 复合涂层可抑制细菌附着，而 Ppy/Mg3(PO4)2/PCL 和 Ppy 涂层优异的光热特性又进一步促进了细菌在积热作用下的清除。感染消除后，改性 PEEK 的 Janus 类表面使巨噬细胞转向抗炎反应，促进了软组织和硬组织的修复。经 Ppy 修饰的磺化 PEEK 可促进软组织中胶原蛋白的分泌，而 Ppy/Mg3(PO4)2/PCL 上的 PCL 膜在近红外光处理下通过温度响应致密化，从而封闭了 Mg3(PO4)2 纳米片的暴露界面，更有利于骨修复。总之，由 Ppy/Mg3(PO4)2/PCL 和 Ppy 组成的具有 Janus 类表面的 PEEK 具有连续抗菌和软硬组织修复的多重生物功能，是一种很有前途的骨内经皮植入物候选材料。

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引用次数: 0

Vine-inspired 3D self-supporting spiral networks enable all-polymer composites advanced dielectric properties and isotropic thermal management 受葡萄树启发的三维自支撑螺旋网络实现了全聚合物复合材料的先进介电性能和各向同性热管理功能

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-05 DOI: 10.1016/j.compositesb.2024.111942

Qibin Xu, Shengchang Zhang, Yingying Zhao, KaiXiang Wang, Shuheng Liang, Yuanyuan Yu, Yan Jiang, Baolong Xue, Mengjin Jiang, Pengqing Liu

Traditionally, it has been considered impossible to overcome the directional limitations associated with polarization and thermal conductivity (λ) in laminated all-polymer composites, which are essential for signal transmission and heat dissipation in fifth-generation equipment shells. Herein, by utilizing hierarchical weaving technology, a vine-like three-dimensional (3D) ultrahigh molecular weight polyethylene (UHMWPE) spiral network is created in laminated ramie-reinforced composites. This unique spiral structure ensures polarization balance by continuously dispersing functional UHMWPE crystals in multiple directions, and it safeguards the micro/nanopores (air carriers) of ramie through self-support, thereby achieving exceptional microwave transmittance (98.3 %). Remarkably, this structure effectively overcomes the limitations of thermal paths in laminated composites along their vertical plane directions, thus simultaneously obtaining high in-plane λ (3.3354 W/mK) and through-plane λ (3.2756 W/mK). This novel approach based on a functional crystal-based 3D spiral network challenges the stereotypes regarding all-polymer composites, particularly in terms of advanced dielectric properties and isotropic thermal management.

传统上，人们认为不可能克服层压全聚合物复合材料中与极化和导热率 (λ) 相关的方向性限制，而这对第五代设备外壳的信号传输和散热至关重要。在这里，利用分层编织技术，在层压苎麻增强复合材料中创建了藤蔓状三维（3D）超高分子量聚乙烯（UHMWPE）螺旋网络。这种独特的螺旋结构通过在多个方向上持续分散功能性超高分子量聚乙烯晶体来确保极化平衡，并通过自我支撑来保护苎麻的微/纳米孔（空气载体），从而实现优异的微波透过率（98.3%）。值得注意的是，这种结构有效克服了层压复合材料沿垂直面方向的热路径限制，从而同时获得了较高的面内 λ（3.3354 W/mK）和面间 λ（3.2756 W/mK）。这种基于功能晶体三维螺旋网络的新方法挑战了全聚合物复合材料的陈规，尤其是在先进的介电性能和各向同性热管理方面。

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引用次数: 0

Electrophoretic deposition of curcumin-loaded mesoporous bioactive glass nanoparticle-chitosan composite coatings on titanium for treating tumor-induced bone defect 在钛上电泳沉积姜黄素负载介孔生物活性玻璃纳米粒子-壳聚糖复合涂层，用于治疗肿瘤诱导的骨缺损

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-05 DOI: 10.1016/j.compositesb.2024.111950

Yuhan Zhang , Jingjie Yu , Chenhuan Wu , Lehao Han , Yunru Tai , Boyan Wang , Yujing Yan , Yekai Liu , Yihan Sun , Qinqin Lu , Kai Zheng , Tian Zhou , Qiang Chen

Clinical treatment of osteosarcoma (OS) presents significant challenges in postoperative tumor recurrence and large segmental bone defects, often necessitating joint replacement or artificial bone implantation to repair failed or defective bone tissue. At the same time, fibroblastic encapsulation can impede direct contact between implants and bones, leading to implant failure. To tackle these issues, mesoporous bioactive glass nanoparticles (MBN) were synthesized and then loaded with curcumin (CUR). Subsequently, chitosan (CTS) was chosen as the charger and coating matrix, and electrophoretic deposition (EPD) was utilized to fabricate a CTS-MBN-CUR composite coating with triple functionality on Ti implants aiming for OS-induced bone repair. MBN-CUR nanoparticles are encapsulated in CTS and uniformly distributed within the coating, achieving robust adhesion and long-term release of CUR. Concurrently, the developed CTS-MBN-CUR coating exhibits moderate hydrophilicity, and good bioactivity. Moreover, three different types of cells, MC3T3-E1, L929, and MG63 cells, were individually cultured with the composite coating and subjected to comprehensive cellular studies. The coating presented favorable bioactivities, and osteogenic performance, and the ability to resist the activity of fibroblast and OS cells. These findings suggest that CTS-MBN-CUR holds promising potential for bone regeneration following OS resection surgery.

骨肉瘤（OS）的临床治疗面临着肿瘤术后复发和大段骨缺损的巨大挑战，通常需要进行关节置换或人工骨植入来修复失败或缺损的骨组织。同时，成纤维细胞的包裹会阻碍植入物与骨骼的直接接触，导致植入物失效。为了解决这些问题，我们合成了介孔生物活性玻璃纳米颗粒（MBN），并在其中添加了姜黄素（CUR）。随后，选择壳聚糖（CTS）作为充填剂和涂层基质，并利用电泳沉积（EPD）技术在钛种植体上制造出具有三重功能的 CTS-MBN-CUR 复合涂层，用于 OS 诱导的骨修复。MBN-CUR 纳米粒子被包裹在 CTS 中，并均匀地分布在涂层中，从而实现了强大的附着力和 CUR 的长期释放。同时，所开发的 CTS-MBN-CUR 涂层具有适度的亲水性和良好的生物活性。此外，还用复合涂层分别培养了 MC3T3-E1、L929 和 MG63 三种不同类型的细胞，并进行了全面的细胞研究。结果表明，该涂层具有良好的生物活性、成骨性能以及抗成纤维细胞和 OS 细胞活性的能力。这些研究结果表明，CTS-MBN-CUR 在 OS 切除手术后的骨再生方面具有广阔的应用前景。

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引用次数: 0

Carbon nanotube intermediate layer intercalation and its influence on surface charge of thin film composite membrane 碳纳米管中间层插层及其对薄膜复合膜表面电荷的影响

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-05 DOI: 10.1016/j.compositesb.2024.111951

Luyao Deng , Ralph Rolly Gonzales , Joy Thomas , Ryosuke Takagi , Wenming Fu , Cheng-Liang Liu , Shang Xiang , Hideto Matsuyama

The surface charge of a separation membrane is a critical factor affecting its performance in ion separation and fouling resistance. Thin-film composite (TFC) polyamide (PA) membrane, commonly used in water treatment, often suffer from excessive surface negative charges, which significantly limits their application and fouling resistance. To address this issue, this work introduces a carbon nanotubes (CNT) intermediate layer to adjust the surface charge of TFC PA membranes, aiming to achieve a PA layer with neutral properties. Novel grazing-incidence wide-angle x-ray scattering (GIWAXS) measurements were employed to elucidate the effect of CNT on the molecular chain stacking of PA. The CNT intermediate layer was found to influence the PA cross-linking, which is related to surface negative charge, by controlling the storage and release of the m-phenylenediamine monomer during interfacial polymerization. The neutral CNT-TFC membrane demonstrated improved NH₄⁺ retention and increased resistance to fouling by protein, surfactant, and E. coli. However, other surface properties, such as roughness and hydrophilicity, could counteract the antifouling benefits of a neutral surface. This work provides insights into additional advantages of CNT intermediate layer intercalation in TFC PA membranes, such as enhanced cross-linking and surface charge control.

分离膜的表面电荷是影响其离子分离和抗污性能的关键因素。常用于水处理的薄膜复合（TFC）聚酰胺（PA）膜往往存在表面负电荷过多的问题，这大大限制了其应用和抗污能力。为解决这一问题，本研究引入了碳纳米管（CNT）中间层来调节 TFC 聚酰胺膜的表面电荷，旨在获得具有中性特性的聚酰胺膜层。研究人员采用了新颖的掠入射广角 X 射线散射（GIWAXS）测量方法来阐明碳纳米管对 PA 分子链堆叠的影响。研究发现，CNT 中间层通过控制界面聚合过程中间苯二胺单体的储存和释放，影响了 PA 的交联，而 PA 的交联与表面负电荷有关。中性 CNT-TFC 膜的 NH4+截留能力有所提高，抗蛋白质、表面活性剂和大肠杆菌污垢的能力也有所增强。然而，粗糙度和亲水性等其他表面特性可能会抵消中性表面的防污优势。这项研究深入探讨了 TFC PA 膜中 CNT 中间层插层的其他优势，如增强交联和表面电荷控制。

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引用次数: 0

Mechanical and electromagnetic interference shielding properties of in-situ grown Si3N4nw synergistic defective-graphene reinforced alumina ceramics 原位生长的 Si3N4nw 协同缺陷石墨烯增强氧化铝陶瓷的机械和电磁干扰屏蔽性能

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-05 DOI: 10.1016/j.compositesb.2024.111945

Yameng Jiao , Qiang Song , Xu Yang , Liyuan Han , Caixiang Xiao , Fei Zhao , Hejun Li

Ceramic matrix composites have versatile application potential but are astricted by brittleness and single function. It can be ameliorated assisted by reinforcements, but the uneven distribution of reinforcements seriously limits the reinforcing efficiency. In this work, the layered porous skeleton of alumina (Al₂O₃) and silicon dioxide (SiO₂) was prepared, then defective-graphene (DG) and silicon nitride nanowires (Si₃N₄nw) were successively grown in-situ in the skeleton (Al₂O₃/SiO₂-G-Si₃N₄nw) to concurrently strength and toughen, as well as endow Al₂O₃ ceramic with electromagnetic interference (EMI) shielding performance. Subsequently, Al₂O₃/SiO₂-G-Si₃N₄nw preform was sintered to construct a uniform Si₃N₄nw synergistic DG enhancement network. The optimum flexural strength and fracture toughness of the sintered ceramic reached 388.52 MPa and 11.29 MPa m^1/2, respectively. This was mainly since DG can fine the ceramic grains, induce crack deflection and furcation, while the uniformly distributed Si₃N₄nw consumed additional energy during the pull-out process. In addition, the EMI shielding effectiveness of the sintered ceramics in X-band was up to 31.77 dB, which is mainly attributed to the conductive loss, dipole polarization loss and interfacial polarization loss of DG. Remarkably, this work provides an idea for efficient strengthening, toughening and integration of structure and function.

陶瓷基复合材料具有广泛的应用潜力，但受限于脆性和单一功能。虽然可以通过增强材料来改善这一问题，但增强材料分布不均严重限制了增强效率。在这项工作中，首先制备了氧化铝（Al2O3）和二氧化硅（SiO2）的层状多孔骨架，然后在骨架（Al2O3/SiO2-G-Si3N4nw）中相继原位生长出缺陷石墨烯（DG）和氮化硅纳米线（Si3N4nw），使其同时具有强度和韧性，并赋予 Al2O3 陶瓷电磁干扰（EMI）屏蔽性能。随后，对 Al2O3/SiO2-G-Si3N4nw 预型件进行烧结，以构建均匀的 Si3N4nw 协同 DG 增强网络。烧结陶瓷的最佳抗弯强度和断裂韧性分别达到了 388.52 MPa 和 11.29 MPa m1/2。这主要是因为 DG 可以细化陶瓷晶粒，诱导裂纹偏转和毛化，而均匀分布的 Si3N4nw 在拉拔过程中会消耗额外的能量。此外，烧结陶瓷在 X 波段的电磁干扰屏蔽效果高达 31.77 dB，这主要归因于 DG 的导电损耗、偶极子极化损耗和界面极化损耗。值得注意的是，这项工作为高效强化、增韧以及结构与功能的整合提供了一种思路。

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