Self-regulating heating and self-powered flexibility are pivotal for future wearable devices.However,the low energy-conversion rate of wearable devices at low temperatures limits their application in plateaus and othe...Self-regulating heating and self-powered flexibility are pivotal for future wearable devices.However,the low energy-conversion rate of wearable devices at low temperatures limits their application in plateaus and other environments.This study introduces an azopolymer with remarkable semicrystallinity and reversible photoinduced solid-liquid transition ability that is obtained through copolymerization of azoben-zene(Azo)monomers and styrene.A composite of one such copolymer with an Azo:styrene molar ratio of 9:1(copolymer is denoted as PAzo9:1-co-polystyrene(PS))and nylon fabrics(NFs)is prepared(composite is denoted as PAzo9:1-co-PS@NF).PAzo9:1-co-PS@NF exhibits hydrophobicity and high wear resistance.Moreover,it shows good responsiveness(0.624 s^(−1))during isomerization under solid ultraviolet(UV)light(365 nm)with an energy density of 70.6 kJ kg^(−1).In addition,the open-circuit voltage,short-circuit current and quantity values of PAzo9:1-co-PS@NF exhibit small variations in a temperature range of−20℃ to 25℃ and remain at 170 V,5 μA,and 62 nC,respectively.Notably,the involved NFs were cut and sewn into gloves to be worn on a human hand model.When the model was exposed to both UV radiation and friction,the temperature of the finger coated with PAzo9:1-co-PS was approximately 6.0°C higher than that of the other parts.Therefore,developing triboelectric nanogenerators based on the in situ photothermal cycles of Azo in wearable devices is important to develop low-temperature self-regulating heating and self-powered flexible devices for extreme environments.展开更多
This work focuses on the development of carpets from sand, fabrics of cotton fiber and mosquito nets and rubber latex. Following a study on the choice of the best formulations, the quantity of rubber latex used for sh...This work focuses on the development of carpets from sand, fabrics of cotton fiber and mosquito nets and rubber latex. Following a study on the choice of the best formulations, the quantity of rubber latex used for shaping varies between 14% and 18% (latex/sand + latex ratio) for the carpet with the fabric of mosquito nets and between 16% and 18% for the one made with the fabric of cotton fiber. Thus, with a mixture of sand, fiber fabrics (cotton and mosquito nets) and rubber latex, carpets were developed. In addition, the wear test carried out on these samples indicates that it is possible to produce carpets with the new material made of rubber sand and latex: SABLATEX At room temperature. Following the characterization test, it resorts to only 16% latex with cotton fiber fabric, allowing to have carpets with good mechanical characteristics.展开更多
The pyrolytic carbon （PyC） coatings were fabricated on A1203 fiber fabrics by the method of chemical vapor deposition （CVD）. The microstructures of A1203 fibers with and without PyC coatings were characterized by ...The pyrolytic carbon （PyC） coatings were fabricated on A1203 fiber fabrics by the method of chemical vapor deposition （CVD）. The microstructures of A1203 fibers with and without PyC coatings were characterized by SEM and Raman spectroscopy. The influence of deposition time of PyC on the DC conductivity （ad） of A1203 filaments and complex permittivity of fabrics at X band （8.2-12.4 GHz） were investigated. The values of Crd and complex permittivity increase with increasing deposition time of PyC. The electron relaxation polarization and conductance loss were supposed to be contributed to the increase of ε＇ and ε＂, respectively. In addition, the reflection loss （RL） of fabrics was calculated. The results show that the microwave absorbing properties of Al2O3 fiber fabrics can be improved by PyC coatings. The best RL results are for 60 min-deposition sample, of which the minimum value is about -40.4 dB at about 9.5 GHz and the absorbing frequency band （AFB） is about 4 GHz.展开更多
A composite coating with inner and outer layers was prepared for the thermal protection of woven silica fiber fabrics.Using a sol mixture of a silica sol and AlF3/SiO2 particles mixed in the stoichiometric molar ratio...A composite coating with inner and outer layers was prepared for the thermal protection of woven silica fiber fabrics.Using a sol mixture of a silica sol and AlF3/SiO2 particles mixed in the stoichiometric molar ratio for mullite,hollow silica spheres and short mullite fibers were added to the inner layer and outer layer,respectively.The phase composition and thermal evolution of the coating,along with the interfacial microstructure between the coating and the matrix,were characterized by means of X-ray diffraction,differential scanning calorimetry/thermogravimetry,scanning electron microscopy,and tensile strength testing.Mullite whiskers grew between 950°C and 1200°C and helped prevent thermal cracking during the drying and densification processes.The hollow silica spheres might play dual roles,weakening the adhesion between the coating and the fibers by reducing their direct contact,but strengthening the joining between the coating and substrate by embedding themselves among the fabrics.展开更多
Self-lubrication is one of the smart material properties required for producing components with enhanced wear resistance and low coefficient of friction.Bidirectional(BD)satin weave polyacrylonitrile(PAN)based carbon ...Self-lubrication is one of the smart material properties required for producing components with enhanced wear resistance and low coefficient of friction.Bidirectional(BD)satin weave polyacrylonitrile(PAN)based carbon fiber(Cf)fabric preform was successfully infiltrated with Al 6061 alloy by squeeze infiltration process.The infiltrated composite shows uniform distribution of carbon fibers in the matrix with the elimination of porosities,fiber damage and close control on the formation of deleterious aluminum carbide(Al4C3)phase.Cf/Al composite exhibits remarkable wear resistance compared to unreinforced alloy due to the formation of self-lubricating tribolayer on the pin surface,which intercepts the contact of matrix metal to counter surface.The BD carbon fiber enhanced the hardness and compressive strength of the composite by restraining the plastic flow behavior of matrix.High resolution transmission electron microscopy shows the presence of Al2O3 and MgAl2O4 spinel,confirmed by EDS and SAD pattern,at the composite interface.The composite shows a lower density of 2.16 g/cm^3 which is a major ad vantage for weight reduction compared to the monolithic alloy(2.7 g/cm^3).展开更多
Samarium doped aluminosilicate fiber was fabricated by modified chemical vapor deposition （MCVD） process. The optical properties of this fiber were characterized by white light source and OSA. The photodarkening pro...Samarium doped aluminosilicate fiber was fabricated by modified chemical vapor deposition （MCVD） process. The optical properties of this fiber were characterized by white light source and OSA. The photodarkening property of the fiber was measured by an Ar^＋ laser. The experiment results proved that the samarium doped aluminosilicate fiber had better photodarkening resistance than that of the samarium doped germanosilicate fiber. A brief explanation showed that the photodarkening loss could be reduced by changing the fiber core＇s material from germanosilicate to aluminosilicate. Samarium doped aluminosilicate fiber was very promising for the red fiber laser application.展开更多
The paper studies a kind of improved photonic crystal fiber gratings fabricated by CO2 laser heating method. The effective refractive index of cladding induced by periodic air hole deformation is computed using multip...The paper studies a kind of improved photonic crystal fiber gratings fabricated by CO2 laser heating method. The effective refractive index of cladding induced by periodic air hole deformation is computed using multipole method, and the rela-tionship between the effective refractive index and the collapse of air-holes is discussed, thereby the modulation expression of effective refractive index is obtained. The grating transmission characteristics are simulated. The results indicate that with the diameter of air-holes increasing from 3.3 ~m to 3.7 μm, the resonance wavelength shows blue-shift, the resonance peak intensifies, and the bandwidth becomes narrow. As the collapse degree of cladding enhances, the resonance wave- length shows red-shift, the transmission increases, and the bandwidth tends to narrow.展开更多
We fabricate the Tm-doped double cladding silica fiber by using the vapor-solution hybrid-doping method, then build up an all-fiber Tin-doped fiber laser which can provide the output power of up to 121 W, correspondin...We fabricate the Tm-doped double cladding silica fiber by using the vapor-solution hybrid-doping method, then build up an all-fiber Tin-doped fiber laser which can provide the output power of up to 121 W, corresponding to a slope efficiency of 51% and an optical-optical efficiency of 48%. By using the domestic Tin-doped fiber, it is the first time a hundred-watt level output at 1915nm has been achieved, to the best of our knowledge. The thermal effect of Tm-doped fiber laser is also analyzed.展开更多
Adsorption capacity of ACFF in cyanide leaching liquor of gold ores was studied with cyanide leaching liquor of gold ores, containing various kinds of ions. The adsorbed leaching liquor was analyzed by atomic emission...Adsorption capacity of ACFF in cyanide leaching liquor of gold ores was studied with cyanide leaching liquor of gold ores, containing various kinds of ions. The adsorbed leaching liquor was analyzed by atomic emission spectroscopy and colorimetric method. The contents of various kinds of ions in ACFF were determined with X-ray photoctron spectroscopy. ACFF not only adsorbed gold but also adsorbed arsenic, nickel, zinc, calcium, sulphur, bismuth, copper, iron, silver and cyanide anion. Atomic percentage of C and those of O, N, Zn, Fe increase and decrease respectively with the increase of the layer depth, while those of Ca, Au, Ag keep constant.展开更多
Two kinds of 2.5D deep straight-joint structure ultra-high molecular weight polyethylene（UHMWPE）（twisted and original） fibers woven fabric reinforced epoxy resin composites were prepared by the hand lay-up method....Two kinds of 2.5D deep straight-joint structure ultra-high molecular weight polyethylene（UHMWPE）（twisted and original） fibers woven fabric reinforced epoxy resin composites were prepared by the hand lay-up method. Subsequently, the flexural property, microstructures, and failure mechanisms of the composites were also investigated. The average flexural strength of 2.5D deep bend-joint structure twisted fiber and original fiber woven fabric composites were 176.66 MPa and 204.45 MPa, respectively. The results of the characteristics indicated that the twist was the main factor which affected the flexural performance. Flexural property vitally relied on the strength of the fiber itself. Twist decreased the strength of the yarns, which meant that when the mechanical property of woven fabric reinforced composites was improved, the yarns must be kept straight in the woven fabric. The study are extremely valuable to guide the improvement of the mechanical property of the woven fabric reinforced composites.展开更多
We propose a novel optical polarizer based on an asymmetric dual-core photonic crystal fiber(PCF) with triangular lattice air-holes.The fiber is designed as that the effective indices of modes in the two cores are mat...We propose a novel optical polarizer based on an asymmetric dual-core photonic crystal fiber(PCF) with triangular lattice air-holes.The fiber is designed as that the effective indices of modes in the two cores are matched at one polarized state but mismatched at another polarized state.As a result,one of the polarization states is coupled to the other core and transferred into a high-order mode.The transmission properties of the polarizer are investigated by the semi-vectorial beam propagation method(SV-BPM).Numerical results demonstrate that a device length of 11.3 mm shows extinction ratio as low as-20 dB with bandwidth as great as 80 nm ranging from 1.51 mm to 1.59 mm.展开更多
The effective index of the cladding fundamental space-filling mode in photonic crystal fiber (PCF) is simulated by the effective index method. The variation of the effective index with the structure parameters of the ...The effective index of the cladding fundamental space-filling mode in photonic crystal fiber (PCF) is simulated by the effective index method. The variation of the effective index with the structure parameters of the fiber is achieved. For the first time, the relations of the V parameter of Yb3+-doped PCF with the refractive index of core and the structure parameters of the fiber are provided. the single-mode characteristics of large-core Yb3+-doped photonic crystal fibers with 7 and 19 missing air holes in the core are analyzed. The large-core single-mode Yb3+-doped photonic crystal fibers with core diameters of 50 μm, 100 μm and 150 μm are designed. The results provide theory instruction for the design and fabrication of fiber.展开更多
A new structure of the photonic crystal fiber（PCF）based Mach-Zednder interferometer（MZI）is fabricated and presented.The structure has microholes ablated by a femtosecond laser.The fringe visibility can be enhanced...A new structure of the photonic crystal fiber（PCF）based Mach-Zednder interferometer（MZI）is fabricated and presented.The structure has microholes ablated by a femtosecond laser.The fringe visibility can be enhanced more than 10 dB compared with the interferometer without a microhole.The interferometer is characterized by sodium chloride solutions for refractive index（RI）sensing.The RI sensitivities are greatly increased by the hole fabrication since it directly changes the cladding modes of the PCF.For the interferometer sensor with two holes,the RI sensitivity is 157.74 nm/RIU,which is 5 times than that of the sensor without a microhole.Microholes ablation with a femtosecond laser on PCF can increase the sensor＇s sensitivity dramatically.Femtosecond laser has a wide application prospect in the field of performance improvement of the sensors.展开更多
Fiber fabric duct is also called Sox duct. Combined with engineering examples, the paper introduces that fiber fabric duct is a new ventilation system product in the field of ventilation. It is a kind of air supply te...Fiber fabric duct is also called Sox duct. Combined with engineering examples, the paper introduces that fiber fabric duct is a new ventilation system product in the field of ventilation. It is a kind of air supply terminal system to replace the traditional iron sheet duct and thermal insulation material, which is widely used in office, exhibition, factory and other public places. It has the advantages of safety and energy saving, short construction period, health and environmental protection, reusable, convenient construction and demolition, and accords with the development direction of green building.展开更多
A staged modeling approach is proposed to divide the needling process into three stages:deformation,insertion and smoothness,and construct dynamic coupling models of rigid force,cutting force and friction force respec...A staged modeling approach is proposed to divide the needling process into three stages:deformation,insertion and smoothness,and construct dynamic coupling models of rigid force,cutting force and friction force respectively.Based on the Boussinesq contact theory,the initial tip-fabric contact behavior is analyzed,combined with the elastic cutting theo-ry to quantify the fiber breakage mechanism,and the Winkler foundation model and LuGre dynamic friction model are used to characterize the friction properties of the needle shaft.It is shown that:the stiffness force in the deformation stage is af-fected by the geometrical parameters of the needle tip and the elastic modulus of the fabric;the cutting force in the insertion stage is closely related to the micro deformation of the fiber;and the dynamic friction behavior in the smooth stage can be depicted by the LuGre model with high accuracy.The complete needling force prediction model finally established provides a theoretical basis for optimizing composite needling process parameters,reducing fiber damage and equipment design.展开更多
The demand for wearable electronics is still growing,and the rapid development of new electrochemical materials and manufacturing processes allows for innovative approaches to power these devices.Here,three-dimensiona...The demand for wearable electronics is still growing,and the rapid development of new electrochemical materials and manufacturing processes allows for innovative approaches to power these devices.Here,three-dimensional(3D)self-supported reduced graphene oxide/poly(3,4-ethylenedioxythiophene)(rGO/PEDOT)hybrid fiber fabrics are systematically designed and constructed via phase inversion-based microfluidic-fiber-spinning assembly(MFSA)method,followed by concentrated sulfuric acid treatment and chemical reduction.The rGO/PEDOT fiber fabrics demonstrate favorable flexibility,interconnected hierarchical network,large specific surface area,high charge storage capacity,and high electrical conductivity.In addition,the all-solid-state supercapacitor made of these rGO/PEDOT fiber fabrics proves large specific capacitance(1028.2 mF cm^(−2)),ultrahigh energy density(22.7μWh cm^(−2)),long-term cycling stability,and excellent flexibility(capacitance retention remains at 84%,after 5000 cycles of continuous deformation at 180o bending angles).Further considering those remarkable electrochemical properties,a wearable self-powered device with a sandwich-shaped supercapacitor(SC)is designed to impressively light up LEDs and power mini game console,suggesting its practical applications in flexible and portable smart electronics.展开更多
The kinetics of hydrolysis of cationic reactive disperse dyes containing quaternary group and chemical shift（13CNMR） of the adjacent carbon atoms with pyridine-acetylamino were discussed. The results show pyridine-a...The kinetics of hydrolysis of cationic reactive disperse dyes containing quaternary group and chemical shift（13CNMR） of the adjacent carbon atoms with pyridine-acetylamino were discussed. The results show pyridine-acetylamino reactive group had higher reactivity than chloroacetylamino and chemical shift（13 CNMR） of the adjacent carbon atoms with pyridine-acetylamino moved 18.77 ppm.展开更多
We report a novel anti-resonant hollow-core fiber(ARF)with a heptagonal core surrounded by connected cladding tubes,which is employed as a laser beam mode shaper.Cladding nodes are formed between each pair of adjacent...We report a novel anti-resonant hollow-core fiber(ARF)with a heptagonal core surrounded by connected cladding tubes,which is employed as a laser beam mode shaper.Cladding nodes are formed between each pair of adjacent cladding tubes,which efficiently enhances the mode coupling,thus significantly suppressing higher-order modes(HOMs)within a short fiber length.Numerical investigation and simulation for variations in the curvature of each node are conducted,through which an optimized structure of cladding nodes is obtained.Experimental results demonstrate that for a 1-m-long ARFbased mode shaper,the output beam quality M^(2)is enabled,and the near-diffraction-limit beam quality is 1.03.The ARF presents a maximum average transmission power of 600 mW,achieving a total coupling efficiency of approximately 85%.Moreover,it is maintained for one hour without inducing any damage while maintaining beam quality.These results highlight the great potential of the mode shaper in applications such as laser surgery,precision welding,and laser writing.展开更多
Aiming at low-loss terahertz(THz)fiber fabrication,we propose a negative curvature terahertz tube fiber(NC-TF).Simulation results show that the NC-TF has similar transmission losses(TLs)to the recognized half-ring fib...Aiming at low-loss terahertz(THz)fiber fabrication,we propose a negative curvature terahertz tube fiber(NC-TF).Simulation results show that the NC-TF has similar transmission losses(TLs)to the recognized half-ring fiber but with a significantly simpler fabrication structure.NC-TF samples are fabricated by extruding polymers from a specially designed mold,presenting a novel approach for obtaining fibers with shaped boundaries.Experimental data demonstrate that the NC-TF exhibits TLs below 3 dB/m in transmission bands,with a minimum TL of 0.2 dB/m at 0.6 THz.The simplicity and practicality of the NC-TF enable its application in various THz transmission or sensing scenarios.展开更多
The mid-infrared(mid-IR)spectral region(2-25μm)holds immense promise for applications in molecular spectroscopy,environmental sensing,biomedical diagnostics,and defense technologies.Among various enabling platforms,f...The mid-infrared(mid-IR)spectral region(2-25μm)holds immense promise for applications in molecular spectroscopy,environmental sensing,biomedical diagnostics,and defense technologies.Among various enabling platforms,fluoride glass fibers stand out due to their broad transmission window,low phonon energy,and excellent rare-earth ion solubility,making them ideal candidates for high-efficiency mid-IR photonic systems.This review comprehensively examines the materials science,fabrication strategies,and laser applications of mid-IR fluoride fibers.We critically examine the structural and optical properties of leading glass systems-fluozirconate,fluoroaluminate,and fluoroindate-highlighting their roles in fiber design and mid-IR luminescence.State-of-the-art fabrication methods,including built-in casting,rod-in-tube,extrusion,and crucible-based fiber drawing,are analyzed in detail alongside the latest commercial fiber developments.Particular emphasis is placed on rare-earth-doped fluoride fiber lasers and supercontinuum sources,covering their physical mechanisms,system architectures,and emerging application scenarios.Finally,the current challenges in glass stability,fabrication scalability,and moisture resistance are discussed,and future research directions are proposed to advance fluoride fibers toward practical mid-IR photonic integration.This review aims to provide insights into the multidisciplinary progress driving the next generation of mid-IR fiber technologies.展开更多
基金supported by the China Postdoctoral Science Foundation(No.2023M732344)the National Natural Science Foundation of China(Nos.51973119,52327802,52173078)+4 种基金Shenzhen Key Laboratory of Photonics and Biophotonics(ZDSYS20210623092006020)Shenzhen Key Laboratory for Low-carbon Natural Science Foundation of Guangdong Province(No.2024A1515010639)Construction Material and Technology(No.ZDSYS20220606100406016)National Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment(Shenzhen)(No.868-000003010103)Joint Funds of Ministry of Education(No.8091B022225).
文摘Self-regulating heating and self-powered flexibility are pivotal for future wearable devices.However,the low energy-conversion rate of wearable devices at low temperatures limits their application in plateaus and other environments.This study introduces an azopolymer with remarkable semicrystallinity and reversible photoinduced solid-liquid transition ability that is obtained through copolymerization of azoben-zene(Azo)monomers and styrene.A composite of one such copolymer with an Azo:styrene molar ratio of 9:1(copolymer is denoted as PAzo9:1-co-polystyrene(PS))and nylon fabrics(NFs)is prepared(composite is denoted as PAzo9:1-co-PS@NF).PAzo9:1-co-PS@NF exhibits hydrophobicity and high wear resistance.Moreover,it shows good responsiveness(0.624 s^(−1))during isomerization under solid ultraviolet(UV)light(365 nm)with an energy density of 70.6 kJ kg^(−1).In addition,the open-circuit voltage,short-circuit current and quantity values of PAzo9:1-co-PS@NF exhibit small variations in a temperature range of−20℃ to 25℃ and remain at 170 V,5 μA,and 62 nC,respectively.Notably,the involved NFs were cut and sewn into gloves to be worn on a human hand model.When the model was exposed to both UV radiation and friction,the temperature of the finger coated with PAzo9:1-co-PS was approximately 6.0°C higher than that of the other parts.Therefore,developing triboelectric nanogenerators based on the in situ photothermal cycles of Azo in wearable devices is important to develop low-temperature self-regulating heating and self-powered flexible devices for extreme environments.
文摘This work focuses on the development of carpets from sand, fabrics of cotton fiber and mosquito nets and rubber latex. Following a study on the choice of the best formulations, the quantity of rubber latex used for shaping varies between 14% and 18% (latex/sand + latex ratio) for the carpet with the fabric of mosquito nets and between 16% and 18% for the one made with the fabric of cotton fiber. Thus, with a mixture of sand, fiber fabrics (cotton and mosquito nets) and rubber latex, carpets were developed. In addition, the wear test carried out on these samples indicates that it is possible to produce carpets with the new material made of rubber sand and latex: SABLATEX At room temperature. Following the characterization test, it resorts to only 16% latex with cotton fiber fabric, allowing to have carpets with good mechanical characteristics.
基金Project (51072165) supported by the National Natural Science Foundation of ChinaProject (KP200901) supported by the Fund of the State Key Laboratory of Solidification Processing,China
文摘The pyrolytic carbon （PyC） coatings were fabricated on A1203 fiber fabrics by the method of chemical vapor deposition （CVD）. The microstructures of A1203 fibers with and without PyC coatings were characterized by SEM and Raman spectroscopy. The influence of deposition time of PyC on the DC conductivity （ad） of A1203 filaments and complex permittivity of fabrics at X band （8.2-12.4 GHz） were investigated. The values of Crd and complex permittivity increase with increasing deposition time of PyC. The electron relaxation polarization and conductance loss were supposed to be contributed to the increase of ε＇ and ε＂, respectively. In addition, the reflection loss （RL） of fabrics was calculated. The results show that the microwave absorbing properties of Al2O3 fiber fabrics can be improved by PyC coatings. The best RL results are for 60 min-deposition sample, of which the minimum value is about -40.4 dB at about 9.5 GHz and the absorbing frequency band （AFB） is about 4 GHz.
基金supported by the National Natural Science Foundation of China(Grant Nos.51272171,51372164)
文摘A composite coating with inner and outer layers was prepared for the thermal protection of woven silica fiber fabrics.Using a sol mixture of a silica sol and AlF3/SiO2 particles mixed in the stoichiometric molar ratio for mullite,hollow silica spheres and short mullite fibers were added to the inner layer and outer layer,respectively.The phase composition and thermal evolution of the coating,along with the interfacial microstructure between the coating and the matrix,were characterized by means of X-ray diffraction,differential scanning calorimetry/thermogravimetry,scanning electron microscopy,and tensile strength testing.Mullite whiskers grew between 950°C and 1200°C and helped prevent thermal cracking during the drying and densification processes.The hollow silica spheres might play dual roles,weakening the adhesion between the coating and the fibers by reducing their direct contact,but strengthening the joining between the coating and substrate by embedding themselves among the fabrics.
文摘Self-lubrication is one of the smart material properties required for producing components with enhanced wear resistance and low coefficient of friction.Bidirectional(BD)satin weave polyacrylonitrile(PAN)based carbon fiber(Cf)fabric preform was successfully infiltrated with Al 6061 alloy by squeeze infiltration process.The infiltrated composite shows uniform distribution of carbon fibers in the matrix with the elimination of porosities,fiber damage and close control on the formation of deleterious aluminum carbide(Al4C3)phase.Cf/Al composite exhibits remarkable wear resistance compared to unreinforced alloy due to the formation of self-lubricating tribolayer on the pin surface,which intercepts the contact of matrix metal to counter surface.The BD carbon fiber enhanced the hardness and compressive strength of the composite by restraining the plastic flow behavior of matrix.High resolution transmission electron microscopy shows the presence of Al2O3 and MgAl2O4 spinel,confirmed by EDS and SAD pattern,at the composite interface.The composite shows a lower density of 2.16 g/cm^3 which is a major ad vantage for weight reduction compared to the monolithic alloy(2.7 g/cm^3).
基金supported by National Science and Technology Major Project (2010ZX04013-052)
文摘Samarium doped aluminosilicate fiber was fabricated by modified chemical vapor deposition （MCVD） process. The optical properties of this fiber were characterized by white light source and OSA. The photodarkening property of the fiber was measured by an Ar^＋ laser. The experiment results proved that the samarium doped aluminosilicate fiber had better photodarkening resistance than that of the samarium doped germanosilicate fiber. A brief explanation showed that the photodarkening loss could be reduced by changing the fiber core＇s material from germanosilicate to aluminosilicate. Samarium doped aluminosilicate fiber was very promising for the red fiber laser application.
基金supported by the National Basic Research Pragram of China (973 Pragram) (No.2010CB327801)the Natural Science Foundation of Hebei Province (No.F2010001286)the Applied Basic Research Programs of Hebei Province (No.10963526D)
文摘The paper studies a kind of improved photonic crystal fiber gratings fabricated by CO2 laser heating method. The effective refractive index of cladding induced by periodic air hole deformation is computed using multipole method, and the rela-tionship between the effective refractive index and the collapse of air-holes is discussed, thereby the modulation expression of effective refractive index is obtained. The grating transmission characteristics are simulated. The results indicate that with the diameter of air-holes increasing from 3.3 ~m to 3.7 μm, the resonance wavelength shows blue-shift, the resonance peak intensifies, and the bandwidth becomes narrow. As the collapse degree of cladding enhances, the resonance wave- length shows red-shift, the transmission increases, and the bandwidth tends to narrow.
基金Supported by the National High-Technology Research and Development Program of China under Grant No 2013AA031501the National Natural Science Foundation of China for Director Fund of WNLO
文摘We fabricate the Tm-doped double cladding silica fiber by using the vapor-solution hybrid-doping method, then build up an all-fiber Tin-doped fiber laser which can provide the output power of up to 121 W, corresponding to a slope efficiency of 51% and an optical-optical efficiency of 48%. By using the domestic Tin-doped fiber, it is the first time a hundred-watt level output at 1915nm has been achieved, to the best of our knowledge. The thermal effect of Tm-doped fiber laser is also analyzed.
文摘Adsorption capacity of ACFF in cyanide leaching liquor of gold ores was studied with cyanide leaching liquor of gold ores, containing various kinds of ions. The adsorbed leaching liquor was analyzed by atomic emission spectroscopy and colorimetric method. The contents of various kinds of ions in ACFF were determined with X-ray photoctron spectroscopy. ACFF not only adsorbed gold but also adsorbed arsenic, nickel, zinc, calcium, sulphur, bismuth, copper, iron, silver and cyanide anion. Atomic percentage of C and those of O, N, Zn, Fe increase and decrease respectively with the increase of the layer depth, while those of Ca, Au, Ag keep constant.
基金Funded by the National Natural Science Foundation of China(No.51001117)
文摘Two kinds of 2.5D deep straight-joint structure ultra-high molecular weight polyethylene（UHMWPE）（twisted and original） fibers woven fabric reinforced epoxy resin composites were prepared by the hand lay-up method. Subsequently, the flexural property, microstructures, and failure mechanisms of the composites were also investigated. The average flexural strength of 2.5D deep bend-joint structure twisted fiber and original fiber woven fabric composites were 176.66 MPa and 204.45 MPa, respectively. The results of the characteristics indicated that the twist was the main factor which affected the flexural performance. Flexural property vitally relied on the strength of the fiber itself. Twist decreased the strength of the yarns, which meant that when the mechanical property of woven fabric reinforced composites was improved, the yarns must be kept straight in the woven fabric. The study are extremely valuable to guide the improvement of the mechanical property of the woven fabric reinforced composites.
基金supported by the National Natural Science Foundation of China (No.10904051)the China Postdoctoral Science Foundation (Nos.20080441070 and 200902505) the Jiangsu Planned Projects for Postdoctoral Research Funds (No.0802018B)
文摘We propose a novel optical polarizer based on an asymmetric dual-core photonic crystal fiber(PCF) with triangular lattice air-holes.The fiber is designed as that the effective indices of modes in the two cores are matched at one polarized state but mismatched at another polarized state.As a result,one of the polarization states is coupled to the other core and transferred into a high-order mode.The transmission properties of the polarizer are investigated by the semi-vectorial beam propagation method(SV-BPM).Numerical results demonstrate that a device length of 11.3 mm shows extinction ratio as low as-20 dB with bandwidth as great as 80 nm ranging from 1.51 mm to 1.59 mm.
基金supported by the National Natural Science Foundation of China (Nos.60637010 and 60978028)the National Basic Research Program of China (No.2010CB327604)+1 种基金the Young Scientists Fund of the Natural Science Foundation of Hebei Province (Nos.F2010001313 andF2010001291)the Science and Technology Development Program of Qinhuangdao of Hebei Province (No.201001A076)
文摘The effective index of the cladding fundamental space-filling mode in photonic crystal fiber (PCF) is simulated by the effective index method. The variation of the effective index with the structure parameters of the fiber is achieved. For the first time, the relations of the V parameter of Yb3+-doped PCF with the refractive index of core and the structure parameters of the fiber are provided. the single-mode characteristics of large-core Yb3+-doped photonic crystal fibers with 7 and 19 missing air holes in the core are analyzed. The large-core single-mode Yb3+-doped photonic crystal fibers with core diameters of 50 μm, 100 μm and 150 μm are designed. The results provide theory instruction for the design and fabrication of fiber.
文摘A new structure of the photonic crystal fiber（PCF）based Mach-Zednder interferometer（MZI）is fabricated and presented.The structure has microholes ablated by a femtosecond laser.The fringe visibility can be enhanced more than 10 dB compared with the interferometer without a microhole.The interferometer is characterized by sodium chloride solutions for refractive index（RI）sensing.The RI sensitivities are greatly increased by the hole fabrication since it directly changes the cladding modes of the PCF.For the interferometer sensor with two holes,the RI sensitivity is 157.74 nm/RIU,which is 5 times than that of the sensor without a microhole.Microholes ablation with a femtosecond laser on PCF can increase the sensor＇s sensitivity dramatically.Femtosecond laser has a wide application prospect in the field of performance improvement of the sensors.
文摘Fiber fabric duct is also called Sox duct. Combined with engineering examples, the paper introduces that fiber fabric duct is a new ventilation system product in the field of ventilation. It is a kind of air supply terminal system to replace the traditional iron sheet duct and thermal insulation material, which is widely used in office, exhibition, factory and other public places. It has the advantages of safety and energy saving, short construction period, health and environmental protection, reusable, convenient construction and demolition, and accords with the development direction of green building.
文摘A staged modeling approach is proposed to divide the needling process into three stages:deformation,insertion and smoothness,and construct dynamic coupling models of rigid force,cutting force and friction force respectively.Based on the Boussinesq contact theory,the initial tip-fabric contact behavior is analyzed,combined with the elastic cutting theo-ry to quantify the fiber breakage mechanism,and the Winkler foundation model and LuGre dynamic friction model are used to characterize the friction properties of the needle shaft.It is shown that:the stiffness force in the deformation stage is af-fected by the geometrical parameters of the needle tip and the elastic modulus of the fabric;the cutting force in the insertion stage is closely related to the micro deformation of the fiber;and the dynamic friction behavior in the smooth stage can be depicted by the LuGre model with high accuracy.The complete needling force prediction model finally established provides a theoretical basis for optimizing composite needling process parameters,reducing fiber damage and equipment design.
基金supported by National Natural Science Foundation of China(11572160,22278225).
文摘The demand for wearable electronics is still growing,and the rapid development of new electrochemical materials and manufacturing processes allows for innovative approaches to power these devices.Here,three-dimensional(3D)self-supported reduced graphene oxide/poly(3,4-ethylenedioxythiophene)(rGO/PEDOT)hybrid fiber fabrics are systematically designed and constructed via phase inversion-based microfluidic-fiber-spinning assembly(MFSA)method,followed by concentrated sulfuric acid treatment and chemical reduction.The rGO/PEDOT fiber fabrics demonstrate favorable flexibility,interconnected hierarchical network,large specific surface area,high charge storage capacity,and high electrical conductivity.In addition,the all-solid-state supercapacitor made of these rGO/PEDOT fiber fabrics proves large specific capacitance(1028.2 mF cm^(−2)),ultrahigh energy density(22.7μWh cm^(−2)),long-term cycling stability,and excellent flexibility(capacitance retention remains at 84%,after 5000 cycles of continuous deformation at 180o bending angles).Further considering those remarkable electrochemical properties,a wearable self-powered device with a sandwich-shaped supercapacitor(SC)is designed to impressively light up LEDs and power mini game console,suggesting its practical applications in flexible and portable smart electronics.
文摘The kinetics of hydrolysis of cationic reactive disperse dyes containing quaternary group and chemical shift（13CNMR） of the adjacent carbon atoms with pyridine-acetylamino were discussed. The results show pyridine-acetylamino reactive group had higher reactivity than chloroacetylamino and chemical shift（13 CNMR） of the adjacent carbon atoms with pyridine-acetylamino moved 18.77 ppm.
基金supported by the National Natural Science Foundation of China(Nos.62275148,62022053,62205192,62405175,and 12074349)the Open Fund of Laboratory of Science and Technology on Marine Navigation and Control,the China State Shipbuilding Corporation(No.2023010102)+2 种基金the Jiangsu Province’s Industry Outlook and Key Core Technologies-Key Projects(No.BE2022055-4)the 111 Project(No.D20031),the Advanced Optical Waveguide Intelligent Manufacturing and Testing Professional Technical Service Platform of Shanghai(No.19DZ2294000)the Science and Technology Commission of Shanghai Municipality Project(Nos.22010500100 and 22ZR1424800)。
文摘We report a novel anti-resonant hollow-core fiber(ARF)with a heptagonal core surrounded by connected cladding tubes,which is employed as a laser beam mode shaper.Cladding nodes are formed between each pair of adjacent cladding tubes,which efficiently enhances the mode coupling,thus significantly suppressing higher-order modes(HOMs)within a short fiber length.Numerical investigation and simulation for variations in the curvature of each node are conducted,through which an optimized structure of cladding nodes is obtained.Experimental results demonstrate that for a 1-m-long ARFbased mode shaper,the output beam quality M^(2)is enabled,and the near-diffraction-limit beam quality is 1.03.The ARF presents a maximum average transmission power of 600 mW,achieving a total coupling efficiency of approximately 85%.Moreover,it is maintained for one hour without inducing any damage while maintaining beam quality.These results highlight the great potential of the mode shaper in applications such as laser surgery,precision welding,and laser writing.
基金supported by the National Natural Science Foundation of China(Nos.62075200 and 12374295)the National Key Research and Development Program of China(No.2023YFB4603803)the Fundamental Research Funds for the Central Universities(No.2042022gf0004).
文摘Aiming at low-loss terahertz(THz)fiber fabrication,we propose a negative curvature terahertz tube fiber(NC-TF).Simulation results show that the NC-TF has similar transmission losses(TLs)to the recognized half-ring fiber but with a significantly simpler fabrication structure.NC-TF samples are fabricated by extruding polymers from a specially designed mold,presenting a novel approach for obtaining fibers with shaped boundaries.Experimental data demonstrate that the NC-TF exhibits TLs below 3 dB/m in transmission bands,with a minimum TL of 0.2 dB/m at 0.6 THz.The simplicity and practicality of the NC-TF enable its application in various THz transmission or sensing scenarios.
基金supported by the National Natural Science Foundation of China(Nos.62225502 and 62090062)the CAS Youth Interdisciplinary Team(No.JCTD-2022-09)+2 种基金the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2022244)the National Key R&D Program of China(Nos.2020YFA0607602 and 2021YFB3500901)the Shandong Provincial Natural Science Foundation of China(No.ZR2024MF033).
文摘The mid-infrared(mid-IR)spectral region(2-25μm)holds immense promise for applications in molecular spectroscopy,environmental sensing,biomedical diagnostics,and defense technologies.Among various enabling platforms,fluoride glass fibers stand out due to their broad transmission window,low phonon energy,and excellent rare-earth ion solubility,making them ideal candidates for high-efficiency mid-IR photonic systems.This review comprehensively examines the materials science,fabrication strategies,and laser applications of mid-IR fluoride fibers.We critically examine the structural and optical properties of leading glass systems-fluozirconate,fluoroaluminate,and fluoroindate-highlighting their roles in fiber design and mid-IR luminescence.State-of-the-art fabrication methods,including built-in casting,rod-in-tube,extrusion,and crucible-based fiber drawing,are analyzed in detail alongside the latest commercial fiber developments.Particular emphasis is placed on rare-earth-doped fluoride fiber lasers and supercontinuum sources,covering their physical mechanisms,system architectures,and emerging application scenarios.Finally,the current challenges in glass stability,fabrication scalability,and moisture resistance are discussed,and future research directions are proposed to advance fluoride fibers toward practical mid-IR photonic integration.This review aims to provide insights into the multidisciplinary progress driving the next generation of mid-IR fiber technologies.
