Advanced Fiber Materials最新文献_第4页

Advanced Janus Membrane with Directional Sweat Transport and Integrated Passive Cooling for Personal Thermal and Moisture Management 先进的 Janus 膜具有定向排汗和集成被动冷却功能，可实现个人热量和湿度管理

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-16 DOI: 10.1007/s42765-024-00444-2

Peng Yang, Yanshan Ju, Jiajun He, Zhengcai Xia, Liang Chen, Shaochun Tang

Passive cooling holds tremendous potential in improving thermal comfort because of its zero energy consumption and cost-effectiveness. However, currently reported radiative cooling materials primarily focus on hydrophobic polymer films, inevitably leading to sweat accumulation and limited cooling efficiency in hot-humid environments. Herein, an advanced Janus membrane with excellent temperature–moisture management capabilities is developed, which combines radiative cooling and evaporative heat dissipation. Modification with Calcium sulfite (CaSO₃) nanoparticles not only enhances the optical properties (state-of-the-art solar reflectance of 96.6%, infrared emittance of 96.1%) but also improves the wettability of the polylactic acid fiber membrane. Especially 15% emittance improvement is achieved due to the strong infrared radiation ability of CaSO₃. The membranes with opposite wettability realize the directional sweat transport (high one-way transport index of 945%). Excellent radiative cooling capability is demonstrated with sub-ambient cooling of 5.8 °C in the dry state. The Janus membranes covering sweaty skin exhibit a 46% shorter drying time and a 2 °C lower average evaporation temperature compared to cotton fabric, indicating highly efficient thermal and moisture management. This work provides an efficient route to achieving smart textiles that enable the human body to adapt to complex environmental conditions.

Graphical Abstract

由于其零能耗和成本效益，被动冷却在改善热舒适方面具有巨大的潜力。然而，目前报道的辐射冷却材料主要集中在疏水性聚合物薄膜上，在湿热环境中不可避免地导致汗液积聚和冷却效率有限。在此基础上，研制了一种集辐射冷却和蒸发散热于一体的具有优异温湿管理能力的先进Janus膜。亚硫酸钙（CaSO3）纳米粒子改性不仅提高了聚乳酸纤维膜的光学性能（最先进的太阳反射率为96.6%，红外发射率为96.1%），而且改善了聚乳酸纤维膜的润湿性。特别是由于CaSO3具有较强的红外辐射能力，使发射度提高了15%。具有相反润湿性的膜实现了汗液的定向输送（单向输送指数高达945%）。干燥状态下的亚环境冷却温度可达5.8℃，具有优良的辐射冷却能力。与棉织物相比，覆盖汗湿皮肤的Janus膜的干燥时间缩短了46%，平均蒸发温度降低了2°C，表明了高效的热湿管理。这项工作为实现智能纺织品提供了一条有效途径，使人体能够适应复杂的环境条件。图形抽象

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引用次数: 0

Vortex-Inspired Hydrodynamic Drafting Spinning Platform for Large-Scale Preparation of Hydrogel Fibers 用于大规模制备水凝胶纤维的涡动牵伸纺丝平台

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-12 DOI: 10.1007/s42765-024-00466-w

Jinhua Dong, Lei Wang, Yi Chen, Boyu Xu, Hai Tang, Ziqiang Zhao, Weikang Lin, Huijing Hu, Peihang Li, Runfeng Cao, Long Wang, Lei Zhang, Yunlang She, Bingyao Deng, Weiyan Sun, Chang Chen, Dawei Li

Hydrogel fibers have gained considerable attention, but their large-scale production and industrial application are currently constrained. The key lies in precise diameter control and industrial manufacturing with a straightforward, energy-saving, and efficient strategy. Herein, we introduce a hydrodynamic drafting spinning platform inspired by water vortices. It employs the rotation of a nonsolvent to generate vortices and further facilitate the efficient drafting of hydrogel fibers. Through supporting equipment, we have achieved impressive results, including scalable production capabilities (1 h, single channel output of 2 × 10³ m of fibers) and extensive adaptability. Subsequently, by simply regulating the velocity difference between fiber extrusion and fluid vortex, hydrogel fibers can be drafted to any diameter from about 1 mm to 5 × 10^–2 mm (for chitosan system). Notably, this platform endows hydrogel fibers to carry functional hydrophilic or hydrophobic drugs. Equally significant, these delicate hydrogel fibers seamlessly integrate with subsequent manufacturing technologies. This allows the production of various end products, such as fiber bundles, yarns, fabrics, and nonwovens. Furthermore, the immense potential in biomedical applications has been demonstrated after obtaining hydrogel fiber-based nonwoven as wound dressings. In summary, the hydrodynamic drafting spinning platform offers an effective solution for the large-scale production of diameter-controllable, multifunctional hydrogel fibers.

Graphical Abstract

水凝胶纤维备受关注，但其大规模生产和工业应用目前还受到限制。关键在于精确控制直径，并采用简单、节能、高效的策略进行工业化生产。在此，我们介绍一种受水漩涡启发的水动力牵伸纺丝平台。它利用非溶剂的旋转产生涡流，进一步促进水凝胶纤维的高效牵伸。通过配套设备，我们取得了令人印象深刻的成果，包括可扩展的生产能力（1 小时，单通道产出 2 × 103 米纤维）和广泛的适应性。随后，只需调节纤维挤出和流体涡流之间的速度差，就能将水凝胶纤维拉伸到从约 1 毫米到 5 × 10-2 毫米（壳聚糖系统）的任何直径。值得注意的是，这一平台赋予了水凝胶纤维携带功能性亲水或疏水药物的能力。同样重要的是，这些精致的水凝胶纤维可与后续制造技术无缝集成。这样就可以生产出各种最终产品，如纤维束、纱线、织物和无纺布。此外，以水凝胶纤维为基础的无纺布作为伤口敷料后，在生物医学应用方面的巨大潜力也得到了证实。总之，水动力牵伸纺丝平台为大规模生产直径可控的多功能水凝胶纤维提供了有效的解决方案。

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引用次数: 0

Wet Spinning Technology for Aerogel Fiber: Pioneering the Frontier of High-Performance and Multifunctional Materials 气凝胶纤维湿法纺丝技术：开拓高性能和多功能材料的前沿领域

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-10 DOI: 10.1007/s42765-024-00440-6

Xue Guo, Yuxin Zhang, Jie Li, Yi Hao, Huizhen Ke, Pengfei Lv, Qufu Wei

Aerogel fiber has broad applications in thermal insulation, pollution adsorption, biomedicine, energy storage, and aerospace. However, the large-scale and continuous production of aerogel fibers remains a significant challenge. Wet spinning technology transforms the static sol–gel process into rapid dynamic gel fiber molding, and is the preferred spinning method for continuous molding and large-scale production of aerogel fibers. This review provides a systematic overview of the production process of wet-spun aerogel fibers and the obstacles it encounters in the forming and drying stages. It also discusses the progress of different spinning strategies in optimizing the structure and properties of aerogel fibers. Recent advances in the properties of aerogel fibers, such as thermal insulation, adsorption, and optical and electromagnetic shielding, which are affected by the structural characteristics of aerogel fibers, are presented. Finally, this review provides a brief conclusion and discusses the technical challenges and future directions for wet-spun aerogel fibers. This review is expected to offer fresh perspectives and innovative strategies for the continuous production of aerogel fibers, the development of high-performance and multifunctional aerogel fibers, and their diverse applications.

Graphical Abstract

气凝胶纤维在保温隔热、污染吸附、生物医学、能源储存和航空航天领域有着广泛的应用。然而，气凝胶纤维的大规模连续生产仍然是一项重大挑战。湿法纺丝技术将静态溶胶-凝胶过程转变为快速动态凝胶纤维成型，是连续成型和大规模生产气凝胶纤维的首选纺丝方法。本综述系统地概述了湿法纺丝气凝胶纤维的生产过程及其在成型和干燥阶段遇到的障碍。文章还讨论了不同纺丝策略在优化气凝胶纤维结构和性能方面取得的进展。此外，还介绍了气凝胶纤维性能的最新进展，如隔热、吸附、光学和电磁屏蔽等受气凝胶纤维结构特性影响的性能。最后，本综述作了简要总结，并讨论了湿纺气凝胶纤维面临的技术挑战和未来发展方向。本综述有望为气凝胶纤维的连续生产、高性能和多功能气凝胶纤维的开发及其多样化应用提供新的视角和创新战略。

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引用次数: 0

Constructing Anisotropic Conductive Networks inside Hollow Elastic Fiber with High Sensitivity and Wide-Range Linearity by Cryo-spun Drying Strategy 通过冷冻纺丝干燥策略在中空弹性纤维内构建具有高灵敏度和宽范围线性度的各向异性导电网络

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-10 DOI: 10.1007/s42765-024-00460-2

Along Zheng, Kening Wan, Yuwen Huang, Yanyan Ma, Tao Ding, Yong Zheng, Ziyin Chen, Qichun Feng, Zhaofang Du

Stretchable conductive fibers composed of conductive materials and elastic substrates have advantages such as braiding ability, electrical conductivity, and high resilience, making them ideal materials for fibrous wearable strain sensors. However, the weak interface between the conductive materials and elastic substrates restricts fibers flexibility under strain, leading to challenges in achieving both linearity and sensitivity of the as-prepared fibrous strain sensor. Herein, cryo-spun drying strategy is proposed to fabricate the thermoplastic polyurethane (TPU) fiber with anisotropic conductive networks (ACN@TPU fiber). Benefiting from the excellent mechanical properties of TPU, and the excellent interface among TPU, silver nanoparticles (AgNPs) and polyvinyl alcohol (PVA), the prepared ACN@TPU fiber exhibits an outstanding mechanical performance. The anisotropic conductive networks enable the ACN@TPU fiber to achieve high sensitivity (gauge factor, (GF) = 4.68) and excellent linearity within a wide working range (100% strain). Furthermore, mathematical model based on AgNPs is established and the resistance calculation equation is derived, with a highly matched fitting and experimental results ((R^{2}) = 0.998). As a conceptual demonstration, the ACN@TPU fiber sensor is worn on a mannequin to accurately and instantly detect movements. Therefore, the successful construction of ACN@TPU fiber with anisotropic conductive networks through the cryo-spun drying strategy provides a feasible approach for the design and preparation of fibrous strain sensing materials with high linearity and high sensitivity.

Graphical Abstract

由导电材料和弹性基底组成的可拉伸导电纤维具有编织能力、导电性和高弹性等优点，是纤维可穿戴应变传感器的理想材料。然而，导电材料与弹性基底之间的界面较弱，限制了纤维在应变下的柔韧性，导致制备的纤维应变传感器在实现线性和灵敏度方面面临挑战。本文提出了低温纺丝干燥策略，以制造具有各向异性导电网络的热塑性聚氨酯（TPU）纤维（ACN@TPU 纤维）。得益于热塑性聚氨酯优异的机械性能，以及热塑性聚氨酯、银纳米粒子（AgNPs）和聚乙烯醇（PVA）之间良好的界面，所制备的 ACN@TPU 纤维表现出卓越的机械性能。各向异性的导电网络使 ACN@TPU 纤维在较宽的工作范围（100% 应变）内实现了高灵敏度（测量系数，(GF) = 4.68）和优异的线性度。此外，还建立了基于 AgNPs 的数学模型，并推导出电阻计算公式，其拟合结果与实验结果高度吻合（（R^{2}）= 0.998）。作为概念性演示，ACN@TPU 纤维传感器被佩戴在人体模型上，可以准确、即时地检测运动。因此，通过低温纺丝干燥策略成功构建了具有各向异性导电网络的ACN@TPU纤维，为设计和制备具有高线性度和高灵敏度的纤维应变传感材料提供了可行的方法。图文摘要

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引用次数: 0

Multidimensionally Nano-topologized Polycaprolactone Fibrous Membrane Anchored with Bimetallic Peroxide Nanodots for Microenvironment-Switched Treatment on Infected Diabetic Wounds 用双金属过氧化物纳米点锚定的多维纳米拓扑化聚己内酯纤维膜，用于感染性糖尿病伤口的微环境切换治疗

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-10 DOI: 10.1007/s42765-024-00447-z

Lin Qi, Yong Huang, Zheng Liu, Jiangshan Liu, Jing Wang, Huilun Xu, Hao Yang, Limin Liu, Ganjun Feng, Shuyu Zhang, Yubao Li, Li Zhang

Delayed healing of diabetic wounds poses a major challenge to human health due to severe vascular dysfunction, sustained inflammation, and vulnerability to microbial infection. Herein, we constructed multidimensionally nano-topologized electrospun polycaprolactone (PCL) fibrous membranes with shish-kebab nanoarrays on each fiber through self-induced crystallization, on which the CuO₂–MgO₂ bimetallic peroxide nanodots (BPNs) were anchored by polydopamine (PDA) as the bridging layer. When activated by the acidic microenvironment (typically infected diabetic wound), BPNs on fibers reacted immediately to release Cu²⁺ and Mg²⁺ ions together with hydrogen peroxide (H₂O₂) molecules, which were then transferred into ·OH radicals through Fenton-type reactions catalyzed by Cu²⁺ for instant bacteria elimination. At the same time, the released Cu²⁺ and Mg²⁺ ions were retained to improve the angiogenesis and suppress the inflammation infiltration, thus remodeling the wound microenvironment. Meanwhile, the one-dimensional (1D)-constructed nano shish-kebabs and PDA coating on fibers provided additional topological activation for cell adhesion and directed migration along the aligned fiber orientation. Through the meticulous design, the resultant membranes markedly accelerated the infected wound healing in the diabetic rat model. This study pioneers a unique design to develop a nanocomposite fibrous membrane that combines multidimensional topologies with chemodynamic therapy (CDT), for efficiently combating infected diabetic wounds.

Graphical abstract

由于严重的血管功能障碍、持续的炎症和易受微生物感染，糖尿病伤口的延迟愈合对人类健康构成了重大挑战。在这里，我们通过自诱导结晶构建了多维纳米拓扑化的电纺聚己内酯（PCL）纤维膜，每根纤维上都有什刹海纳米阵列，其上以聚多巴胺（PDA）为桥层锚定了CuO2-MgO2双金属过氧化物纳米点（BPNs）。当被酸性微环境（典型的糖尿病感染伤口）激活时，纤维上的 BPNs 会立即发生反应，释放出 Cu2+ 和 Mg2+ 离子以及过氧化氢（H2O2）分子，然后通过 Cu2+ 催化的 Fenton 型反应转化为 -OH 自由基，从而瞬间消灭细菌。同时，释放的 Cu2+ 和 Mg2+ 离子被保留下来，改善血管生成，抑制炎症浸润，从而重塑伤口微环境。同时，纤维上的一维（1D）纳米串珠和 PDA 涂层为细胞粘附提供了额外的拓扑激活，并引导细胞沿排列整齐的纤维方向迁移。通过精心设计，所制成的膜明显加快了糖尿病大鼠模型感染伤口的愈合。这项研究开创性地设计开发了一种纳米复合纤维膜，它将多维拓扑结构与化学动力疗法（CDT）相结合，可有效防治糖尿病感染性伤口。

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引用次数: 0

High-Energy–Density Fiber Supercapacitors Based on Transition Metal Oxide Nanoribbon Yarns for Comprehensive Wearable Electronics 基于过渡金属氧化物纳米带纱线的高能量密度纤维超级电容器，适用于综合性可穿戴电子设备

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-10 DOI: 10.1007/s42765-024-00462-0

Junseong Ahn, Suchithra Padmajan Sasikala, Yongrok Jeong, Jin Goo Kim, Ji-Hwan Ha, Soon Hyoung Hwang, Sohee Jeon, Junhyuk Choi, Byung-Ho Kang, Jihyeon Ahn, Jun-Ho Jeong, Sang Ouk Kim, Inkyu Park

Fiber supercapacitors (FSs) based on transition metal oxides (TMOs) have garnered considerable attention as energy storage solutions for wearable electronics owing to their exceptional characteristics, including superior comfortability and low weights. These materials are known to exhibit high energy densities, high specific capacitances, and fast redox reactions. However, current fabrication methods for these structures primarily rely on chemical deposition, often resulting in undesirable material structures and necessitating the use of additives, which can degrade the electrochemical performance of such structures. Herein, physically deposited TMO nanoribbon yarns generated via delamination engineering of nanopatterned TMO/metal/TMO trilayer arrays are proposed as potential high-performance FSs. To prepare these arrays, the target materials were initially deposited using a nanoline mold, and subsequently, the nanoribbon was suspended through selective plasma etching to obtain the desired twisted yarn structures. Because of the direct formation of TMOs on Ni electrodes, a high energy/power density and excellent electrochemical stability were achieved in asymmetric FS devices incorporating CoNixOy nanoribbon yarns and graphene fibers. Furthermore, a triboelectric nanogenerator, pressure sensor, and flexible light-emitting diode were synergistically combined with the FS. The integration of wearable electronic components, encompassing energy harvesting, energy storage, and powering sensing/display devices, is promising for the development of future smart textiles.

Graphical Abstract

基于过渡金属氧化物（TMOs）的纤维超级电容器（FSs）作为可穿戴电子设备的储能解决方案，因其卓越的特性（包括极佳的舒适性和低重量）而备受关注。众所周知，这些材料具有高能量密度、高比电容和快速氧化还原反应的特点。然而，目前这些结构的制造方法主要依赖于化学沉积，往往会产生不理想的材料结构，而且必须使用添加剂，这可能会降低此类结构的电化学性能。在此，我们提出将通过纳米图案化 TMO/ 金属/TMO 三层阵列的分层工程生成的物理沉积 TMO 纳米带纱作为潜在的高性能 FS。为了制备这些阵列，首先使用纳米啉模具沉积目标材料，然后通过选择性等离子刻蚀悬浮纳米带，以获得所需的扭曲纱线结构。由于在镍电极上直接形成了 TMO，因此在结合了 CoNixOy 纳米带纱线和石墨烯纤维的不对称 FS 器件中实现了高能量/功率密度和优异的电化学稳定性。此外，还将三电纳米发电机、压力传感器和柔性发光二极管与 FS 进行了协同组合。可穿戴电子元件的集成，包括能量收集、能量存储和为传感/显示设备供电，对未来智能纺织品的开发大有可为。

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引用次数: 0

Carbothermal Diffusion Reaction Synthesis of CrN/carbon Nanofiber for Efficient Electrosorption of Fluoride Ions from Water 碳热扩散反应合成用于高效电吸附水中氟离子的 CrN/碳纳米纤维

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-09 DOI: 10.1007/s42765-024-00465-x

Xuran Yang, Hao Zhang, Jiamin Gao, Yiyuan Yao, Yujun Zhou, Junwen Qi, Yue Yang, Zhigao Zhu, Jiansheng Li

Development of novel electrode materials with the integration of structural and compositional merits can essentially improve the electrosorption performance. Herein, we demonstrate a new strategy, named as carbothermal diffusion reaction synthesis (CDRS), to fabricate binder-free CrN/carbon nanofiber electrodes for efficient electrosorption of fluoride ions from water. The CDRS strategy involves electrospinning MIL-101(Cr) particles with polyacrylonitrile (PAN) to form one-dimensional nanofiber, followed by spatial-confined pyrolysis process in which the nitridation reaction occurred between nitrogen element from PAN and chromium element from MIL-101(Cr), resulting macroscopic, free-standing electrodes with well dispersed ultrafine CrN nanoparticles on porous nitrogen enriched carbon matrix. As expected, the F⁻ adsorption capacity reached 47.67 mg g⁻¹ and there was no decrease in F⁻ removal after 70 adsorption regenerations in 50 mg L⁻¹ F⁻ solution at 1.2 V. The adsorption mechanism of F⁻ was explored by X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT). The enhanced F⁻ adsorption capacity was achieved by the reversible Cr⁴⁺/Cr³⁺ redox pair provided by CrN and the electrical double layer capacitance produced by carbon skeleton. This study provides guidance on synergistic modulation of shaping and composition optimization of novel functional materials for electrosorption, catalysis, and supercapacitor applications.

Graphical abstract

开发集结构和成分优点于一体的新型电极材料可以从根本上提高电吸附性能。在此，我们展示了一种名为 "碳热扩散反应合成（CDRS）"的新策略，用于制造无粘结剂的 CrN/碳纳米纤维电极，以高效电吸附水中的氟离子。CDRS 策略包括将 MIL-101(Cr)颗粒与聚丙烯腈（PAN）电纺丝形成一维纳米纤维，然后进行空间限制热解过程，在此过程中，PAN 中的氮元素与 MIL-101(Cr)中的铬元素发生氮化反应，从而在多孔富氮碳基体上形成宏观、独立的超细 CrN 纳米颗粒电极。通过 X 射线光电子能谱（XPS）和密度泛函理论（DFT）探讨了 F- 的吸附机理。CrN提供的可逆Cr4+/Cr3+氧化还原对和碳骨架产生的双电层电容增强了F-的吸附能力。这项研究为新型功能材料在电吸附、催化和超级电容器应用中的协同调制成型和成分优化提供了指导。图文摘要

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引用次数: 0

Synergy of Polydopamine-Assisted Additive Modification and Hierarchical-Morphology Poly(Vinylidene Fluoride) Nanofiber Mat for Ferroelectric-Assisted Triboelectric Nanogenerator 用于铁电辅助三电纳米发电机的聚多巴胺辅助添加剂改性和分层形态聚偏氟乙烯纳米纤维毡的协同作用

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-09 DOI: 10.1007/s42765-024-00461-1

Junseo Gu, Donghyun Lee, Jeonghoon Oh, Hyeokjun Si, Kwanlae Kim

In the last decade, numerous physical modification methods have been introduced to enhance triboelectric nanogenerator (TENG) performance although they generally require complex and multiple fabrication processes. This study proposes a facile fabrication process for Poly(vinylidene fluoride) (PVDF) nanofiber (NF) mats incorporating additive and nonadditive physical modifications. Patterned PVDF NF mats are prepared by electrospinning using a metal mesh as the NF collector. As a negative triboelectric material, the TENG with the patterned PVDF NF mat exhibits superior performance owing to the engineered morphology of the contact layer. PVDF is crucial in TENGs owing to its superior ferroelectric properties and surface charge density when combined with specific electroceramics. Hence, the synergy of the physical modification methods is achieved by incorporating BaTiO₃ (BTO) nanoparticles (NPs) into the PVDF. By functionalizing BTO NPs with polydopamine, the TENG performance is further improved owing to the enhanced dispersion of NPs and improved crystallinity of the PVDF chains. Utilizing large NPs produces a nanopatterning effect on the NF surface, thereby resulting in the hierarchical structure of the NF mats. The source of the voltage signals from the TENG is analyzed using fast Fourier transform.

Graphical abstract

在过去十年中，为提高三电纳米发电机（TENG）的性能，引入了许多物理改性方法，但这些方法通常需要复杂和多重的制造工艺。本研究提出了一种结合添加剂和非添加剂物理改性的聚偏二氟乙烯（PVDF）纳米纤维（NF）毡的简便制造工艺。利用金属网作为 NF 收集器，通过电纺丝制备出图案化的 PVDF NF 垫。作为一种负三电材料，采用图案化 PVDF NF 垫的 TENG 由于接触层的工程形态而表现出卓越的性能。PVDF 具有优异的铁电特性和表面电荷密度，结合特定的电化学特性，因此在 TENG 中至关重要。因此，通过在 PVDF 中加入 BaTiO3 (BTO) 纳米粒子 (NPs)，实现了物理改性方法的协同作用。通过用多巴胺对 BTO NPs 进行官能化，NPs 的分散性得到增强，PVDF 链的结晶度得到改善，从而进一步提高了 TENG 的性能。利用大尺寸 NPs 可在 NF 表面产生纳米图案效应，从而形成 NF 垫的分层结构。利用快速傅立叶变换分析了来自 TENG 的电压信号源。

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引用次数: 0

Toughening and Responsive Contractile Shape Memory Fibrous Membrane via Water for Mechanically Active Wound Dressing 通过水增韧和响应性收缩形状记忆纤维膜，用于机械活性伤口敷料

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-09 DOI: 10.1007/s42765-024-00463-z

Wen Liu, Wei Zhao, Kunrong Xie, Xue Feng Li, Yufu Wang, Deyan Kong, Yanju Liu, Jinsong Leng

Conventional wound dressings only protect passively against bacterial infection. Emerging mechanically active adhesive dressings (AADs) are inspired by the active closure of embryonic wounds. It can promote wound healing by actively contracting the wound bed. AADs meet the requirements of high toughness, stimulus–response, and dynamic adhesion properties, which are challenging. Hence, we construct a water-responsive shape memory polyurea fibrous membrane (PU-fm) featuring favorable toughness, wet-adhesion, breathability, absorbency of four times its weight, and antibacterial. First, the water-toughened electrospun PU-fm is fabricated using a homemade polyurea (PU) elastomer with multistage hydrogen bond networks as a spinning solution. Furthermore, a Janus-structured polyurea-polydopamine-silver fibrous membrane (PU@PDA@Ag-fm) is engineered, integrating antibacterial properties without compromising mechanical robustness. It demonstrates strong adhesion to the skin, actively promotes wound contraction, and enables adaptive wrapping of tissues of varying sizes by the water-driven shape memory effect. Antibacterial tests and wound healing experiments indicate that the PU@PDA@Ag-fm has favorable antibacterial properties against Escherichia coli (E.coli) and accelerates the wound healing rate by 20%. For the first time, water-responsive shape memory PU-fm as the AADs is constructed, providing a new strategy for wound management. This can be extended to applications in other smart devices for biomedicine such as tendon repair, and bioelectronic interfaces.

Graphical Abstract

传统的伤口敷料只能被动地防止细菌感染。新兴的机械活性粘合敷料（AADs）受到胚胎伤口主动闭合的启发。它可以通过主动收缩伤口床来促进伤口愈合。AADs 需要满足高韧性、刺激响应和动态粘附性能等要求，具有很大的挑战性。因此，我们构建了一种水响应形状记忆聚脲纤维膜（PU-fm），它具有良好的韧性、湿粘附性、透气性、四倍于自身重量的吸水性和抗菌性。首先，使用具有多级氢键网络的自制聚脲（PU）弹性体作为纺丝溶液，制造出水增韧电纺聚脲纤维膜。此外，还设计了一种 Janus 结构的聚脲-多巴胺-银纤维膜（PU@PDA@Ag-fm），在不影响机械坚固性的情况下集成了抗菌特性。它对皮肤有很强的粘附性，能积极促进伤口收缩，并能通过水驱动的形状记忆效应对不同大小的组织进行自适应包裹。抗菌测试和伤口愈合实验表明，PU@PDA@Ag-fm 对大肠杆菌（E.coli）具有良好的抗菌性能，并能使伤口愈合速度加快 20%。这是首次将水响应形状记忆 PU-fm 作为 AADs 构建起来，为伤口管理提供了一种新策略。这可以扩展到其他生物医学智能设备中的应用，如肌腱修复和生物电子接口。

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引用次数: 0

Fabrication of MoS2 Petals-Decorated PAN Fibers-Based Triboelectric Nanogenerator for Energy Harvesting and Smart Study Room Touch Sensor Applications 制备基于 MoS2 花瓣装饰 PAN 纤维的三电纳米发电机，用于能量收集和智能书房触摸传感器应用

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials

Pub Date : 2024-07-05 DOI: 10.1007/s42765-024-00453-1

Gokana Mohana Rani, Kugalur Shanmugam Ranjith, Seyed Majid Ghoreishian, A. T. Ezhil Vilian, Changhyun Roh, Reddicherla Umapathi, Young-Kyu Han, Yun Suk Huh

Currently, the development of clean and green energy-harvesting solutions is becoming increasingly critical. Batteries have long been considered as the most traditional and efficient technology for powering electronic devices. However, they have a limited lifetime and require constant observation and replacement. To address this issue, triboelectric nanogenerator (TENG) has garnered considerable attention as a prospective sustainable power source for smart devices. Further, several approaches for improving their output performance have been investigated. Herein, we created a unique TENG based on densely packed molybdenum disulfide (MoS₂) petals grown on electrospun polyacrylonitrile (PAN) fibers (MPF) using a hydrothermal technique. Designed MPF-TENG is used for mechanical energy-harvesting and smart study room touch sensor applications. The effects of pure MoS₂ powder, PAN fibers, and MoS₂ grown on the PAN fibers were investigated. MoS₂ addition enhanced the surface charge, surface roughness, and electrical performance. The MPF-TENG had a maximum triboelectric output voltage, current, charge, and average power density of 245.3 V, 5.12 µA, 60.2 nC, and 1.75 W/m², respectively. The MPF-TENG remained stable for more than 10,000 cycles. The MPF-TENG successfully illuminated blue LEDs, turned on a timer clock, and could be used in smart study rooms to generate energy. This study provides an effective method for improving the performance of TENG by growing MoS₂ petals on PAN fibers, with promising applications in power supplies for portable electronic devices. Furthermore, the fabricated MPF-TENG was demonstrated to be a potential touch sensor for smart study rooms to save electricity.

Graphical Abstract

目前，开发清洁和绿色能源收集解决方案正变得越来越重要。长期以来，电池一直被认为是为电子设备供电的最传统、最高效的技术。然而，电池的使用寿命有限，需要不断观察和更换。为解决这一问题，三电纳米发电机（TENG）作为智能设备的可持续电源前景广受关注。此外，人们还研究了几种提高其输出性能的方法。在此，我们利用水热技术，在电纺聚丙烯腈（PAN）纤维（MPF）上生长出密集排列的二硫化钼（MoS2）花瓣，并在此基础上创建了一种独特的 TENG。设计的 MPF-TENG 可用于机械能量收集和智能书房触摸传感器应用。研究了纯 MoS2 粉末、PAN 纤维和生长在 PAN 纤维上的 MoS2 的效果。添加的 MoS2 增强了表面电荷、表面粗糙度和电气性能。MPF-TENG 的最大三电输出电压、电流、电荷和平均功率密度分别为 245.3 V、5.12 µA、60.2 nC 和 1.75 W/m2。MPF-TENG 在超过 10,000 个周期内保持稳定。MPF-TENG 成功地点亮了蓝色 LED 灯，打开了定时钟，并可用于智能自习室发电。这项研究提供了一种通过在 PAN 纤维上生长 MoS2 花瓣来提高 TENG 性能的有效方法，有望应用于便携式电子设备的电源。此外，制备的 MPF-TENG 被证明是一种潜在的触摸传感器，可用于智能自习室以节约用电。

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引用次数: 0