Advanced Fiber Materials最新文献

Passive radiative thermal management holds substantial potential for enhancing energy efficiency and sustainability. However, few research efforts have addressed the integration of mechanical robustness and durability with the distribution and composition of photonic structures within materials. Silk fibers, known for their distinctive hierarchical morphological structure, offer a solution to these challenges by providing exceptional optical and mechanical properties. Inspired by this, we developed a silk-like tough metafiber (PMABF) that incorporated multiple scatterers through a multi-scale structural construction of nanofiber aggregates and molecular interface engineering. We show that fabrics woven with PMABF can provide high mid-infrared (MIR) emissivity (98.6%) within the atmospheric window and 86.7% reflectivity in the solar spectrum, attributed to its ellipsoidal photonic structure featuring by surface micro-/nano-particles and numerous internal voids. Through mature and scalable industrial manufacturing routes, our metafibers show excellent mechanical strength, hydrophobicity and thermal stability while maintaining effective passive radiative cooling. Practical application tests demonstrated that molecules introduced during the heterogeneous composite process significantly enhanced the metafiber’s tensile strength (125%) and compressive stress (261.5%) by forming junction welds among the nanofiber backbones to efficiently distribute the external forces. Furthermore, the superior thermal stability and flexibility of PMABF open abundant opportunities for diverse applications with demanding thermal management requirements, such as thermal protection and multi-scenario thermal camouflage.

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Biodegradable polylactic acid (PLA) melt-blown nonwovens (MN) are regarded as the promising alternatives for petroleum-based air filtration mediums. However, the filtration performances of most PLA MN were greatly relied on their electrostatic effects which would suffer from inevitable attenuation caused by environment conditions during long-term storage. Herein, the innovative combination of breath-figure (BF) and melt-blowing technologies was proposed to prepare the hierarchically structured PLA MN-bearing BF net pattern (PMBP) for enhanced air filtration. Initially, melt-blowing technology was employed to conduct large-scale preparation of PLA MN with a low-pressure drop of 25.7 Pa but an unsatisfactory PM_2.5 (aerodynamic diameter below 2.5 μm) filtration efficiency of 59.5%. At the optimized BF processing conditions involving polymer concentration of 0.5 wt% in hexafluoroisopropanol and relative humidity of 50%, the resultant BF net pattern exhibited uniformly microporous structure with the average pore size low to 1.02 μm. The integration of large-pore PLA MN and small-pore net pattern endowed PMBP with hierarchical structures, which induced PMBP displaying excellent filtration performances (filtration efficiency of 95.8% and pressure drop of 39.3 Pa), and eliminating over 99% of PM_2.5 particles within 3 min in the actual smoke test, even without the benefit of static charges. The filtration performances of the PMBP remained stable in high-humidity environments and during long-term storage. Furthermore, the PMBP also exhibited exceptional self-cleaning properties. Overall, this work opens up a promising approach to develop fully bio-based and high-performance filtration materials with hierarchical structures.

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Chronic hypoxia affects stem cell function during tissue repair. Thus far, the hypoxia-associated impact on periosteal stem cells (PSCs), the main contributor to bone repair, remains unknown, and a tailored oxygen modulation strategy for optimizing PSC function is lacking. Here, PSCs exhibit time-dependent proliferation and survival upon hypoxic exposure and a critical 48-h time-point is identified at which hypoxia transitions from beneficial to detrimental. Then, a photothermal-sensitive coaxial fiber-reinforced membrane containing oxygen and pravastatin is constructed to function as an intelligent oxygen supply system. Leveraging near-infrared light as an ON/OFF switch, the system noninvasively scales up oxygen release beginning 48 h post-implantation, counteracting prolonged hypoxia and mitigating its adverse effects on PSCs. The sustained release of pravastatin from the membrane accelerates early neovascularization both directly through its pro-angiogenic effect and indirectly by stimulating vascular endothelial growth factor secretion from PSCs, ensuring a continuous oxygen supply after exogenous oxygen exhaustion. Notably, pravastatin steers PSCs toward robust osteogenic differentiation and provides multifunctional bioactive cues for advanced bone regeneration in vivo. This time-scheduled approach to modulate oxygen supply noninvasively could be applicable beyond bone regeneration for hypoxia-related diseases and multi-tissue repair.

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Graphene fiber materials have emerged as key enablers in the advancement of wearable electronics due to their outstanding electrical conductivity, mechanical strength and flexibility. This review explores the fabrication techniques of graphene fibers, including wet spinning, electrospinning and dry spinning, which have been refined to produce high-performance fibers tailored for various wearable applications. Graphene fibers demonstrate exceptional functionality in wearable sensing technologies, such as strain, pressure and humidity sensors, while also showing promises in flexible energy storage devices like supercapacitors and batteries. Moreover, fabrication techniques like weaving, spinning and additional encapsulations have enabled the integration of graphene fibers into smart textiles, enhancing flexibility and durability. These methods ensure seamless electronic integration into fabrics for applications in flexible displays and wearable systems. By summarizing all the advances of graphene fibers in wearable electronics, this review provides a roadmap for future research directions. Future developments will focus on enhancing structural performance, hybridization with other materials and scalable fabrication techniques to support commercialization. These advancements position graphene fibers as a critical material for next-generation wearable electronics, offering seamless integration of functionality, comfort and durability.

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Rechargeable aluminum-ion batteries (AIBs) possess a higher theoretical volumetric capacity than lithium-ion batteries (LIBs) and offer a sustainable, low-cost alternative. However, the performance of AIBs fails to meet commercial standards due to the challenges experienced including volume changes caused by interfacial issues, side reactions of the electrolyte with electrode, and low cyclic stability. These issues are attributed to the inability of existing cathode materials to perform effectively. To address these challenges, 1-dimensional (1D) structures, especially nanofiber (NF) cathodes offer a promising solution due to their higher aspect ratios, specific surface area, flexibility, and quantum scale effects. To date, there has been no comparative analysis of the electrochemical and structural performances of NF based cathodes in AIBs. Thus, this review focuses on the recent developments in various transition metal oxides and chalcogenides of (Mo, V, Mn, Ni, Cu, W, Se, and Co) along with carbon-based NFs as cathodes for AIBs. Challenges were observed in adopting trivalent Al³⁺ cations as charge carriers and maintaining the structural integrity of the cathode. Several novel approaches have been developed to enhance electrical conductivity, including the incorporation of the metal oxides/chalcogenides with the carbon NF substrates, crystallizing the nanoparticles at high temperatures, and using self-assembly and templating techniques to create multi-dimensional NF films. Other battery components such as separators were replaced with carbonaceous structures in the MnSe based cathodes to increase ion mobility, and Mo current collectors to prevent dendrites. This review includes prospects aimed at improving performance and functionality, based on observations from the discussed work and innovations in AIBs such as compositing, surface functionalization, and defect engineering through ion doping.

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Ultrahigh dynamic strength fibrous materials are very vital for applications in high-strain rate environments. A recent research article on Science highlights a significant advancement in polymer-carbon nanotube composite fibers, which developed a new strategy to fabricate fibrous materials with an unprecedented dynamic strength of 14 GPa by optimizing hierarchical structures. This work provides fresh mechanism insights and an effective strategy to harness the intrinsic strength of individual carbon nanotubes at the macroscale, and marks a dramatic breakthrough in the realm of ultrahigh-strength fibers.

Conformable and breathable textile structures are ideal for flexible wearable pressure sensors, yet challenges remain in scalable fabrication, easy integration, and programmability. This study presents a cost-effective and customizable method to create fully textile-based pressure sensors using machine embroidery, enabling seamless integration into smart wearable systems. Two sensing configurations were developed: a single-layer satin block embroidered with conductive yarn, which exhibited high piezoresistivity, fast response (35 ms), quick recovery (16 ms), and robust durability over 5000 press-and-release cycles, proven effective for monitoring activities such as plantar pressure and muscle contraction, and making it suitable for personalized health and fitness applications. The second configuration, a double-layer embroidery sensor with a conductive path and two parallel spacers anchored beneath a satin block, allows for array integration with minimal wiring, demonstrated by a 3 × 3 sensing array that, with the help of a convolutional neural network (CNN) machine learning model, accurately recognized handwritten numbers (0–9) with a 98.5% accuracy, showing its potential for user authentication and secure passcode entry. These findings underscore the potential of machine embroidery for developing scalable, integrated, and high-performance intelligent textile systems, paving the way for wearable technologies that are customizable, comfortable, and aesthetically appealing for a wide range of applications.

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Water and energy scarcity present significant global challenges in arid and remote regions, therefore, it is imperative to develop a sustainable approach that harnesses atmospheric moisture and sunlight to generate both water and energy. A portable system was presented, which directly harvests water from atmospheric moisture and generates energy using cellulose aerogels–high-entropy perovskite La(Cr_0.2Mn_0.2Fe_0.2Co_0.2Ni_0.2)O₃–lithium chloride (CA–LB5O3–LiCl). The system captures water from moist air during the night and facilitates solar-driven water evaporation and electrocatalytic water splitting during the day. The CA integrated with LiCl achieves efficient moisture absorption even in arid conditions due to its combined hydrophilic structure and entrapped water. The high-entropy perovskite LB5O3 promotes the lattice oxygen mechanism by weakening the metal–oxygen bond, resulting in an overpotential of 290 mV at 10 mA·cm⁻². Furthermore, its excellent solar absorption and photothermal conversion enhance water uptake to 1.01 g·g⁻¹ at 60% relative humidity (RH) as well as increase water evaporation rates to 2.1 kg·h⁻¹·m^–2. This process simultaneously generates O₂ and H₂ from moist airflow, providing both clean water and green fuel. This flexible and sustainable system offers a new pathway for producing water and energy in resource-scarce environments with potential applications in arid and remote regions.

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Wound injuries are prevalent, and inappropriate dressings can heighten the risk of bacterial infections and extend the duration of recovery. Conventional wound dressings lack adaptability to the skin, and provide insufficient anti-leakage properties, failing to offer effective physical protection. Films composed of nano- or micro-fibers, due to their suitable softness and excellent deformation capabilities, are apt for wound repair. While electrospinning is employed to produce fibrous wound dressings, its complex procedures and the use of high voltage electric fields can impair the activity of bioactive molecules. In this study, we employed solution blow spinning to produce in-situ hybrids of hydrogenated styrene–butadiene–styrene (SEBS) block copolymer with Ag or TiO₂ nanoparticles for wound dressings. The SEBS polymer forms a closely fitting fibrous membrane on the skin surface via rapid solvent evaporation driven by high-speed airflow. This fibrous membrane demonstrates optimal hydrophobicity, breathability, ductility, and flexibility, aligning well with human skin, to ensure effective physical protection. Upon incorporation of Ag nanoparticles, the fibrous membrane displays robust antibacterial effects against methicillin-resistant Staphylococcus aureus (MRSA) and Escherichia coli (E. coli). Evaluations of wound healing in MRSA-infected wounds, when compared to commercial Tegaderm™ films, show that the SEBS-based fibrous membranes effectively reduce infection, expedite wound closure, enhance collagen deposition, suppress the expression of inflammation-related cytokines and elevate the expression of angiogenesis-related cytokines, thus significantly promoting infected wounds.

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A solution blow spinning fibrous membrane was developed for the fabrication of in-situ wound dressings with high flexibility, ease of peeling off, waterproof nature, and prevention of blood penetration.