Advanced Fiber Materials最新文献

Spun-bond non-woven fabrics (NWFs) made of porous C-shaped polypropylene fibers were applied in rapid oil absorption and effective on-line oil spillage monitoring. It is of great interest to further optimize the absorption properties of these materials by tuning their preparation parameters as well as characterize them with theoretical models. In this paper, effects of die shape, diluent composition (mixtures of dibutyl and dioctyl phthalate), and drawing speed on their porous structure and oil-absorbing performance were systematically investigated and characterized based on two novel concepts, i.e., the equivalent capillary tube pore radius and the kinetic pore tortuosity (barrier to access) derived from the simplest capillary tube liquid-filling model. The use of higher dibutyl phthalate fractions under faster drawing speeds resulted in the formation of larger and more connected inner filament sub-micron pores. Three stages of tube filling relating to inter-filament large pores, medium pores close to bonding points, and inner filament small pores were observed in the spun-bond NWFs. Continuous oil recovery rates of 986 L·m⁻²·h⁻¹ with an oil/water selectivity of 6.4 were achieved in dynamic skimming experiments using simulated spilled oil.

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Developing novel antibacterial dressing protecting skin injuries from infection is essential for wound healing. In this study, sericin, a bio-waste produced during the degumming of silk cocoons, is utilized to exfoliate MoS₂ layers and improve the dispersity and stability of MoS₂ nanosheets (MoS₂-NSs). Moreover, owing to its ability to promote oxygen permeability and cell growth and its good biocompatibility, MoS₂-NS/Sericin maintains its photothermal property under an 808 nm light source for a strong antibacterial activity as well as improves the fibroblast migration, which accelerates wound healing. Furthermore, the in vitro experiments indicates that MoS₂-NS/Sericin can also scavenge reactive oxygen species (ROS) at an inflammatory stage of wound healing and transform classical activated macrophages (M1-type) into alternatively activated macrophages (M2-type), which is beneficial for wound recovery. Based on these results observed in vitro, full-thickness skin wound experiments are conducted on rats, and the corresponding results show that MoS₂/Sericin under 808 nm irradiation exhibits the best performance in promoting wound healing. Overall, MoS₂-NS/Sericin exhibits a high potential for bacteria-infected wound healing.

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Oral diseases are common and prevalent, affecting people's health and seriously impairing their quality of life. The implantable class of materials for a safe, convenient, and comprehensive cure of periodontitis is highly desired. This study shows a proof-of-concept demonstration about the implant fibrous membranes. The fibers having a trilayer eccentric side-by-side structure are fabricated using the multiple-fluid electrospinning, and are fine candidates for treating periodontitis. In the trilayer eccentric side-by-side composite nanofibers, the outermost layer contains a hydrophilic polymer and a drug called ketoprofen, which can reach a release of 50% within 0.37 h, providing a rapid pain relief and anti-inflammatory effect. The middle layer is loaded with metronidazole, which is manipulated to be released in a sustained manner. The innermost layer is loaded with nano-hydroxyapatite, which can directly contact with periodontal tissues to achieve the effect of promoting alveolar bone growth. The experimental results indicate that the developed implant films have good wettability, fine mechanical properties, biodegradability, and excellent antibacterial properties. The implant films can reduce inflammatory responses and promote osteoblast formation by down-regulating interleukin 6 and up-regulating osteoprotegerin expression. In addition, their composite nanostructures exhibit the desired promotional effects on fibroblast attachment, infiltration, proliferation, and differentiation. Overall, the developed fibrous implant films show strong potential for use in a combined treatment of periodontitis. The protocols reported here pave a new way to develop multi-chamber based advanced fiber materials for realizing the desired functional performances through a robust process-structure-performance relationship.

Bulky external power supplies largely limit the continuous long-term application and miniaturization development of smart sensing devices. Here, we fabricate a flexible and wearable integrated sensing system on an electrospun all-nanofiber platform. The three parts of the sensing system are all obtained by a facile ink-based direct writing method. The resistive pressure sensor is realized by decorating MXene sheets on TPU nanofiber. And, the resistive temperature sensor is prepared by compositing MXene sheets into poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). The thin-film zinc–air battery (ZAB) includes an interdigital zinc–air electrode that is bonded with a gel polymer electrolyte. It can supply a high open-circuit voltage of 1.39 V and a large areal capacity of 18.2 mAh cm⁻² for stable and reliable power-supplying sensing parts operation. Thanks to the hydrophobic nature of TPU and open-ended micropores in the TPU nanofiber, the sensing system is waterproof, self-cleaning, and air and moisture permeable. For application, the above-mentioned functional components are seamlessly integrated into an intelligent electronic wristband, which is comfortably worn on a human wrist to monitor pulse and body temperature in real time with continuous operation of up to 4 h. By the novel design and remarkable performance, the proposed integrated all-nanofiber sensing system presents a promising solution for developing advanced multifunctional wearable electronics.

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We developed an integrated sensing system on a flexible and breathable thermoplastic polyurethane nanofiber platform. The sensing system is realized by a direct write technology and includes a pressure sensor, temperature sensor, and rechargeable zinc–air battery. The integrated sensing system was designed for wristbands and demonstrated to accurately detect pulse beating and skin temperature under different states for up to 4 hours of wearing.

Polyphenol is a promising bio-inspired material vital for the creation of various functional systems. The increasing trend in developement and application of polyphenol-coated textiles not only showcases its global relevance but also indicates the extensive scientific research interest in this field. Polyphenol's numerous functional groups play a pivotal role as structural units for covalent and/or non-covalent interactions with polymers, as well as for anchoring transition metal ions crucial for the formation of multi-functional textiles. Consequently, polyphenol enhances textiles with diverse capabilities, such as hydrophobicity, flame retardance, photothermal conversion, and antibacterial properties. This emergent material has rapidly found its way into an array of applications, including solar evaporators, water purification, wound dressings, and thermal management. This review aims to offer an encompassing summary of the recent advances in the field of bio-inspired and multifunctional polyphenol-coated textiles. Polyphenols were introduced as the building blocks of textiles and exhaustively discussed their design and functionality within the textile framework. Moreover, these functions spurred myriad intriguing applications for textiles. Some of the key challenges were also explored in this emerging field, which were bound to stimulate thinking processes in multi-functional textile design.

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Overview of bio-inspired polyphenol-coated textiles

In various biomedical fields, noninvasive medical procedures are favored over invasive techniques, as the latter require major incisions or surgeries that cause bleeding, pain, and tissue scarring. The increased use of noninvasive biomedical equipment has created a demand for effective energy storage devices that are sufficiently compact to be used as a power source, easy to commercialize, and bio-friendly. Herein, we report the facile synthesis of nickel molybdenum oxide nanoparticle-infused biocarbon microfibers (NiMoO NPs@BCMFs) as a novel energy storage material. The microfibers were derived from the bracket fungus Laetiporus sulphureus. In a three-electrode system, the NiMoO NPs@BCMFs/nickel foam (NF) electrode delivered an areal capacity of 113 µAh cm⁻² at 1.5 mA cm⁻², with excellent cycling stability. Its capacity retention was 104%, even after 20,000 cycles. Bare BCMFs were also synthesized from the fungal biomass to fabricate a negative BCMFs/NF electrode. This, together with the positive NiMoO NPs@BCMFs/NF electrode, was used to construct a bio-friendly (hybrid-type) micro-supercapacitor (BMSC), which exhibited maximum energy and power density values of 56 µWh cm⁻² and 11,250 µW cm⁻², respectively. When tested for its ability to power biomedical electronics, the BMSC device successfully operated an electrical muscle stimulator, inducing potential signals into a volunteer in real-time application.

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Silk fibroin (SF) with skin-like features and function shows great prospects in wearable electronics and smart dressing. However, the traditional method of loading conductive materials on physical interfaces can easily lead to the detachment of conductive materials, poor mechanical properties, and unstable conductivity, which hinder their practical application. Herein, simple wet spinning was utilized to fabricate multifunctional regenerated silk fibers reinforced with different contents of intrinsically conductive cellulose nanofibril (CNFene). Significant enhancements in fiber homogeneity, thermal stability, conductivity, mechanical strength, and sensing ability were achieved due to more regular orientation of silk fibroin molecules and strong intermolecular interactions with CNFene. The optimized sample (SF₁) with high sensitivity (100 ms), excellent washing/rubbing resistance, and superb waterproof properties (22 days) can comprehensively monitor human motion and weak signals. Surprisingly, inspired by the different humidity levels around wounds at different stages of healing, SF₁ with favorable humidity sensitivity can be developed as a smart dressing for monitoring wound healing. Therefore, this work provides a simple preparation route of smart high-performance fiber for flexible electronic devices, smart dressing, and underwater smart textiles.

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The interfacial solar evaporator is a key technology for eco-friendly desalination, playing a crucial role in alleviating the global water scarcity crisis. However, limitation of photothermal water evaporation efficiency persists due to inadequate water transfer at the water-steam interface. Herein, we present a new type of scalable and recyclable arch bridge photothermal fabric with efficient warp-direction water paths by a convenient shuttle-flying weaving technique. Compared to the previous overall layer-by-layer assembled fabric, our photothermal fabric precisely constructed effective water paths and achieved excellent water-heat distribution at the solar evaporation interface, which greatly improved the photothermal conversion efficiency and evaporation rate. By the design of the weaving process, the photothermal fabric shows a new interface contact mode of the water path fiber and polyaniline photothermal fiber. Besides, the arch-bridge type design not only minimizes heat loss area but also enhances the water evaporation area, resulting in high-efficiency all-weather available solar water evaporation. Furthermore, the results show that the temperature, evaporation rate and solar-vapor conversion efficiency of photothermal fabric can reach above 123 ℃, 2.31 kg m⁻² h⁻¹ and 99.93% under a solar illumination of 1 kW m⁻². The arch-bridge photothermal fabric with an excellent water evaporation rate has been successfully established, which provides a new paradigm for improving the sustainable seawater desalination rate.

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Flexible yarn sensors designed for integration into textiles have the potential to revolutionize wearable technology by continuously monitoring biomechanical strain. However, existing yarn-shaped sensors rely on capacitance as a strain-dependent electrical signal and often face limitations in achieving high sensitivity, especially across a broad strain range. Here, we propose a waterproof all-in-one capacitive yarn sensor (ACYS) that is tailored to monitor a wide range of biophysical strains. Owing to the coaxial helical electrode and the ionic liquid-doped dielectric layer, the ACYS demonstrates remarkable stretchability, ultrahigh capacitance variation, and an outstanding gauge factor of 6.46 at 140% strain. With exceptional mechanical durability based on enduring 3300 stretching cycles and favorable resistance to sweat erosion, this 1D structure can be seamlessly integrated into textiles, making it ideal for use in wearable electronics. Demonstrating its application versatility, the ACYS accurately measures biomechanical strain in joint movements, facial expressions, and physiological assessments, making it a promising advancement in wearable technology.

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Existing personal thermal regulating fabrics fall short of meeting the demands for sustainable and protective outdoor temperature management. Here, a versatile and comfortable Janus fabric has been developed by embedding boron nitride nanosheets within a porous polyurethane matrix (BNNS@TPU) and introducing Ti₃C₂T_x MXene into another layer of TPU pores (MXene/TPU). The well-distributed BNNS in porous TPU matrix enhances refractive index difference, increases porosity and optimizes pore size distribution, resulting in an excellent solar reflectivity (R = 94.22%), while the distinct distribution of MXene in porous TPU effectively improves solar absorptivity (α = 93.57%) and enhances the conduction loss of electromagnetic waves due to multiple scattering and reflection effects. With a simple flip, Janus fabric can switch between sub-ambient cooling of ~ 7.2 °C and super-ambient heating of ~ 46.0 °C to adapt to changing weather and seasonal conditions. The fabric achieves an electromagnetic interference shielding efficiency of 36 dB, protecting the human body from electromagnetic radiation, attributed to the hierarchical distribution of highly conductive MXene. Furthermore, Janus fabric offers excellent comfort, abrasion resistance, washability, and flame retardancy for practical wear. This study presents an effective strategy for developing personal thermal regulating fabrics with adaptability to environmental changes and resistance to electromagnetic radiation.

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