Carbon fibers(CFs) are widely used in cutting-edge and civilian fields due to their excellent comprehensive properties such as high strength and high modulus,superior corrosion and friction resistances,excellent the...
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Carbon fibers(CFs) are widely used in cutting-edge and civilian fields due to their excellent comprehensive properties such as high strength and high modulus,superior corrosion and friction resistances,excellent thermal stability,light weight,and high electrical ***,their natural ultra-black appearance is difficult to meet the aesthetic needs of today' s civilian sector and the need for optical stealth in the military *** addition,conventional coloring methods are difficult to effectively adhere to CF surfaces due to high crystallinity and highly inert surface caused by their graphite-like *** this work,inspired by the nacre structural color of pearls,colored CFs with 1D photonic crystal structure are prepared by cyclically depositing amorphous(Al2O3+TiO2) layers on the surface of carbon CFs through atomic layer deposition(ALD).The obtained CFs exhibit brilliant colors and excellent environmental durability in extreme ***,the colored CFs also exhibit high EMI shielding effectiveness(45 dB) and optical stealth properties,which can be used in emerging optical devices and electromagnetic and optical stealth equipment.
The smart clothes emerge as a new generation of garments developed in the scientific and industrial communities,gaining increasing attention due to the real-time responses to exterior environments or *** to the unique...
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The smart clothes emerge as a new generation of garments developed in the scientific and industrial communities,gaining increasing attention due to the real-time responses to exterior environments or *** to the unique merits of liquid metal(LM)such as excellent fluidity,high conductivity and intrinsic stretchability in ambient environment,LM-based smart textiles are widely applied in chemical sensors,wearable electronics and stretchable *** review is dedicated to summarizing different preparation methods and functions of LM-based textiles(LMTs)for smart clothes,which consists of the design principles,the fabrication strategies,the working mechanism of LMTs,and the tremendous applications sorted by the features of *** methods of the synthesis to build LMTs are divided into two domains classified by spatial *** strategy is the exterior decoration with LM,while the other is interior encapsulation of ***,the primary applications of LMT-based smart clothes have been illustrated through the utilization of the properties of LM *** categorization of LMTs aims to facilitate further investigation and research in the future development of LM-based smart ***,future prospects and opportunities of LMT-based smart clothes are discussed in this area.
advanced aerogel fibers possess numerousadvantages amalgamating the attributes of aerogels and fibermaterials, rendering them invaluable in the realm of thermalmanagement and regulation. However, the achievement ofrob...
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advanced aerogel fibers possess numerousadvantages amalgamating the attributes of aerogels and fibermaterials, rendering them invaluable in the realm of thermalmanagement and regulation. However, the achievement ofrobust mechanical properties and increased temperaturestability is still a major challenge for the majority of aerogelfibers. Herein, SiO_(2)-Kevlar hybrid aerogel fibers with bioniccore-shell structure were prepared by reaction spinning andweaved into fabric. Kevlar nanowires dispersion is pumpedinto a bath comprising a self-synthesized silica sol, whichfacilitates the hybridization of biphasic aerogels through thegel reaction. Precise control over the diameter (200-800 μm)and structure of the wet gel fibers was achieved throughmeticulous adjustment of the spinning solution composition and spinning parameters. Subsequent freeze-drying processfacilitates the formation of a core-shell hybrid structure, in which the SiO_(2) aerogel layer effectively encapsulate the Kevlaraerogel core fiber. Taking full advantage of the mechanical properties of the Kevlar core fiber, the resulting SiO_(2)-Kevlaraerogel fibers exhibit commendable weaving characteristics (51.8 MPa). Furthermore, SiO_(2)-Kevlar aerogel fabrics exhibitenhanced thermal insulation characteristics with a thermal conductivity of 0.037 W/(m·K). As a result of the presence ofexternal SiO_(2) aerogel layer, the overall temperature resistance performance of the SiO_(2)-Kevlar fabric reach up to 700 ℃.
When the protective and protected systems are detached,the former can be allowed to absorb the kinetic energy of the impacting projectile through large deformation without considering the back face signature of the **...
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When the protective and protected systems are detached,the former can be allowed to absorb the kinetic energy of the impacting projectile through large deformation without considering the back face signature of the *** paper presents a novel double-face knitted fabric(DFKF)designed for this very impacting *** tests equipped with high-speed camera were used to characterize the ballistic performance with the impact velocities ranging from 100 m/s to 450 m/*** results showed that the ballistic limits(V_(bl))of DFKF are approximately triple and double that of its counterpart UD and plain fabrics,*** mass-normalized metrics,the specific energy absorption(SEA)is 250%and 350%greater than the UD and plain fabrics at their corresponding V_(bl)*** quasi-static tests showed that the DFKF displayed greater resilience,crease recovery properties,and flexibility,which also made it an especially better candidate than UD and plain weaves for the design of umbrella surface *** was also found that DFKF is dependent on yarn count and the incorporation of spandex.A prototype anti-ballistic umbrella is manufactured using DFKF made of 200D multi-filament *** ballistic performance is also sensitive to the impact site when the umbrella is subjected to impact.
The weak interfacial strength and porous structure of the meso-aramid paper cause mechanical and insulating *** density,regulating pore structure,and improving interfacial interactions of meso-aramid are crucial for p...
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The weak interfacial strength and porous structure of the meso-aramid paper cause mechanical and insulating *** density,regulating pore structure,and improving interfacial interactions of meso-aramid are crucial for promoting the perfor-mance of meso-aramid papers.A PMIA/polyethylene terephthalate(PET)composite paper was prepared using the wet method with meso-aramid short cut fibres(PMIA)and PET pulp as raw *** sandwich-structured PMIA/PET paper was achieved by covering PET microfiber non-wovens served as the surface layer while the PMIA/PET composite paper acted as the core *** the high-temperature hot pressing process,the PET pulp transformed into a viscous melt that coated on aramid fibres in between layers,forming a typical‘reinforced concrete’interface structure within the core layer of the PMIA/PET composite *** PET non-wovens on top and bottom surfaces were converted into a dense PET film that filled and covered the holes and defects in the PMIA/PET composite *** unique structure enabled the sandwich-structured PMIA/PET composite paper to exhibit excellent tensile strength(80.41 N/cm)and breakdown strength(56.35 kV/mm),surpassing most reported performances of meso-aramid papers in *** work not only provides novel insights for pre-paring high-performance meso-aramid papers,but also shows potential applications for other materials and structures.
Aramid fibers,due to their relatively high inter-yarn friction,high strength,high modulus,and other characteristics,have become a typical representative of flexible anti-ballistic materials in modern *** research on t...
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Aramid fibers,due to their relatively high inter-yarn friction,high strength,high modulus,and other characteristics,have become a typical representative of flexible anti-ballistic materials in modern *** research on the anti-penetration of aramid fabrics mostly focuses unilaterally on the structure and performance of aramid fabrics or the shape and size of projectiles,with fewer studies on the coupled effect of both on ballistic *** study analyzes how the coupling relationship(or size effect)between the projectile and fiber bundle dimensions affects the fabric ballistic performance from a mesoscopic scale *** plain weave aramid fabric as the research object,considering different diameter projectiles,through a large number of ballistic impact tests and numerical simulations,parameters such as ballistic limit velocity,average energy absorption of fabric,and specific energy absorption ratio(average energy absorption of fabric divided by projectile cross-sectional area)are obtained for ballistic performance *** influence law of projectile size on the ballistic performance of high-performance fabrics is as follows:The relative range of fitted ballistic limit velocity at different target positions gradually decreases and then stabilizes as the projectile diameter increases,indicating that the fabric structure effect gradually disappears at a projectile diameter of 12 mm;The average ballistic limit velocity at three impact positions,P1,P2,and P3,provides the corresponding ballistic limit velocity for 1000D aramid fabric,which increases with projectile diameter but the rate of increase slows down at an inflection point,which in this study occurs where the fabric structure effect nearly disappears at a projectile diameter of 12 mm;The energy absorption ratio increases and then decreases as the projectile diameter increases from 4 mm to 20 mm,reaching a peak at the diameter of 12 mm due to the gradual disappearance of the fabri
To achieve the scalable production of high-performance melamine-based flame retardant nanofibers, solution blowing spinning technology was employed into the continuous spinning of melamine(MA)@polyacrylonitrile(PAN) c...
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To achieve the scalable production of high-performance melamine-based flame retardant nanofibers, solution blowing spinning technology was employed into the continuous spinning of melamine(MA)@polyacrylonitrile(PAN) composite fibers. Propelled by the compressed air current, spinnable MA@PAN solutions can be shaped into nanofiber with a high flow rate over 50 m L/h. Among different melamine-based materials,melamine phosphate(MPP) exhibited excellent solubility in the solution, exceeding 30 wt%, ensuring that the MPP@PAN nanofiber products demonstrated exceptionally robust flame-retardant performance. Furthermore,through fiber textile needle punching technology, loose fiber sponge can be organized into enhanced fiber blankets. These MPP@PAN nanofiber products exhibited outstanding flame retardant and thermal insulation properties, rendering them pivotal as the flame-retardant materials in extreme environments.
Achieving large-scale production of high-performance mullite ceramic nanofibers posed a formidable ***, an air heating-solution blow spinning technique was designed for the mass fabrication of mullite nanofibers at hi...
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Achieving large-scale production of high-performance mullite ceramic nanofibers posed a formidable ***, an air heating-solution blow spinning technique was designed for the mass fabrication of mullite nanofibers at high speeds, ranging from 6 to 60 ml/h. Spinnable aqueous Al–Si solution systems, employing various aluminum sources, were systematically investigated. The optimization of the solution blow spinning apparatus involved the incorporation of a hot air blow device capable of dispensing streams of hot, dry air. Comprehensive investigations were conducted to examine the impact of variables such as spinning solution viscosity, spinning rate, and spinning distance on the resulting mullite fiber diameter and morphology. Following sintering at 1200°C, mullite fiber cotton was successfully synthesized, exhibiting diameters spanning from 500 nm to 5 μm. These mullite nanofiber cotton demonstrated exceptional attributes, including robust temperature stability(up to 1300°C), remarkable thermal insulation properties and superior filtration efficiency.
Tailoring water supply to achieve confined heating has proven to be an effective strategy for boosting solar interfacial evaporation ***,because of salt clogging during desalination,a critical point of constriction oc...
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Tailoring water supply to achieve confined heating has proven to be an effective strategy for boosting solar interfacial evaporation ***,because of salt clogging during desalination,a critical point of constriction occurs when controlling the water rate for confined *** this study,we demonstrate a facile and scalable weaving technique for fabricating core-sheath photothermal yarns that facilitate controlled water supply for stable and efficient interracial solar *** core-sheath yarn comprises modal fibers as the core and carbon fibers as the *** of the core-sheath design,remarkable liquid pumping can be enabled in the carbon fiber bundle of the dispersed superhydrophilic modal *** woven fabrics absorb a high proportion(92%)of the electromagnetic radiation in the solar spectrum because of the weaving structure and the carbon fiber *** one-sun(1 kW·m^(-2))illumination,our woven fabric device can achieve the highest evaporation rate(of 2.12kg·m^(-2)·h^(-1) with energy conversion efficiency:93.7%)by regulating the number of core-sheath *** application tests demonstrate that our device can maintain high and stable desalination performance in a 5 wt%NaCl solution.
As a material with good biocompatibility,hydroxyapatite(HAP)can have optical properties after doping with various rare earth *** a biocompatible fluorescent material,doped HAP could have broad applications in biologic...
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As a material with good biocompatibility,hydroxyapatite(HAP)can have optical properties after doping with various rare earth *** a biocompatible fluorescent material,doped HAP could have broad applications in biological probes,drug delivery,optoelectronic materials,fluorescence anti-counterfeiting,and other *** this paper,we put forward the preparation of HAP doped with terbium(Ⅲ)ions(Tb^(3+))by hydrothermal *** controlling the Tb^(3+)doping content in reaction and the reaction time,the changes in HAP's structure,morphology,and luminescence properties under different conditions were *** the doping amount of Tb^(3+)reached an optimal value,the dipole-quadrupole would occur and the concentration would be *** control experiment showed that the optimal Tb3+content was 7.5×10^(-5)mol,which showed the best fluorescence ***,a non-luminous material,was rarely used in the field of fluorescent anti-counterfeiting and photoelectric *** proposed to prepare a luminescent aramid/polyphenylene sulfide(ACFs/PPS)fiber paper and a new light-emitting diode(LED)using the Tb-doped HAP *** composite sample exhibited an excellent stability and fluorescence performance,which also demonstrated a possibility of HAP applications in anticounterfeiting and *** introduction of Tb3+dopant HAP was done to give HAP optical properties and broaden the application range of HAP.
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