Polyvinylidene fluoride(PVDF)/garnet composite polymer electrolytes(CPEs) have shown great potential in the development of solid-state lithium metal batteries(SSLMBs) due to their excellent flexibility, high ionic con...Polyvinylidene fluoride(PVDF)/garnet composite polymer electrolytes(CPEs) have shown great potential in the development of solid-state lithium metal batteries(SSLMBs) due to their excellent flexibility, high ionic conductivity and superior mechanical strength.However, uneven dispersion of garnet fillers in CPEs would lead to deterioration of lithium metal batteries(LMBs) performance and severely limit their widespread application. Considering the rapidly growing research of addressing above-mentioned issue, herein, recent progress in the design and fabrication of uniformly dispersed fillers in PVDF/garnet CPEs for high-performance SSLMBs is summarized. We firstly analyze the mechanism for the aggregation of inorganic fillers, and provide a detailed introduction to the strategies for solving the uneven dispersion of nanoparticles in solid electrolytes. Moreover, we also comprehensively summarize their applications in PVDF/garnet electrolytes and their impact on the electrochemical performance of SSLMBs. Finally, the application challenges and future prospects of PVDF/garnet CPEs in SSLMBs were also proposed to promote their further development. It is anticipated that this review could inspire ongoing research interest in rational designing and fabricating novel CPEs for high-performance SSLMBs.展开更多
Ultrafine metal nanoparticles are crucial for various applications,such as energy storage,catalysis,electronics,and biomedicine,owing to their high surfaceto-volume ratio and unique electronic properties.However,conve...Ultrafine metal nanoparticles are crucial for various applications,such as energy storage,catalysis,electronics,and biomedicine,owing to their high surfaceto-volume ratio and unique electronic properties.However,conventional nanoparticle synthesis methods often face challenges like irregular shapes and agglomeration,leading to compromised functionality.To address these challenges,this paper introduces a novel,rapid,high-temperature thermal radiation heating for the ultrafast synthesis and dispersion of metal nanoparticles.Utilizing the heating properties of carbon materials,the direct Joule heating generated by them rises to 1800-2000 K within~200 ms,followed by cooling to room temperature at a rate of 2×10^(3)K s^(-1).展开更多
A phase-field model is developed in this paper based on the similarity between mechanical fracture and dielectric breakdown.Electrical treeing is associated with the dielectric breakdown in solid dielectrics by the ap...A phase-field model is developed in this paper based on the similarity between mechanical fracture and dielectric breakdown.Electrical treeing is associated with the dielectric breakdown in solid dielectrics by the application of high voltages.Instead of explicitly tracing the propagation of conductive channel,this model initializes a continuous phase field to characterize the extent of damage.So far,limited research has been conducted for simulating the effect of nanofiller dispersion on electrical treeing.No study has modeled the effect of uniform and nonuniform dispersion of nanofillers with varying filler concentration on treeing.Since electrical treeing tends to decrease the breakdown strength of solid dielectrics therefore,nanofillers are widely used to distract the tree from a straight channel to distribute its energy in multiple paths.Diverting a straight treeing channel into mul-tiple paths reduces the chances of its propagation from live to dead-end hence,improving the breakdown strength.The physical and chemical nature of nanofillers has a crucial impact on increasing the resistance to treeing.In this paper,phase-field model is developed and used to simulate electrical treeing in polyethylene for varying concentrations of alumina nanofiller using COM-SOL Multiphysics.Tree inception time,tree-growth patterns,and corresponding changes in dielectric strength is studied for both dispersions.Electrical treeing under different concentrations of alumina nanofillers with uniform and nonuniform dispersion is investigated in polyethylene as a base material.It is observed that fillers with uniform dispersion increases the resistance to tree-ing and tree inception time.Highest resistance to treeing is observed by adding 1%nanoalumina uniformly in raw polyethylene.Moreover,in uniform dispersion the tree deflects into multiple branches earlier than nonuniform dispersion impeding the damage speed as well.展开更多
The development of magnetic-electric synergistic microwave-absorbing materials represents a pivotal strategy for optimizing impedance matching,overcoming skin effects,and enhancing absorbing performance.Achieving a un...The development of magnetic-electric synergistic microwave-absorbing materials represents a pivotal strategy for optimizing impedance matching,overcoming skin effects,and enhancing absorbing performance.Achieving a uniform distribution of magnetic particles within the dielectric material during preparation poses an immense challenge.This study employed PMMA-assisted electrospinning to achieve a homogeneous dispersion of magnetic particles on the surface of 1D or 2D carbon nanomaterials.The electrospinning process effectively blends the precursor of the magnetic material with the carbon nanomaterials while utilizing PMMA as a sacrificial template to anchor and evenly disperse the magnetic particles onto the carbon material’s surface.As anticipated,this approach ensures uniform modification of magnetic particles within the carbon matrix,thereby achieving ideal interface uniformity.Comparative analysis reveals that optimized samples incorporating carbon nanotubes and graphene exhibit significantly reduced minimum reflection loss by 294% and 313%,respectively,compared to those without electrospinning treatment.Further examination of the composite microstructure and electromagnetic parameters underscores that excellent dispersion of magnetic particles is crucial in improving impedance matching.This article presents a controllable and easily scalable preparation method for constructing interface-uniform dielectric-magnetic composite structures with exceptional homogeneity.展开更多
The sulfate ions modified YAG：Ce^（3＋） phosphors were prepared by co-precipitation method and characterized by X-ray diffraction,transmission electron microscopy,and photoluminescence.Effects of sulfate ions on the...The sulfate ions modified YAG：Ce^（3＋） phosphors were prepared by co-precipitation method and characterized by X-ray diffraction,transmission electron microscopy,and photoluminescence.Effects of sulfate ions on the photoluminescence（PL） property of the as-prepared YAG：Ce^（3＋） phosphors were studied,with sodium dodecyl sulfate（SDS） being added to R^（3＋）（Ce^（3＋）,Y^（3＋）,Al^（3＋）） ions.Results indicated that pure YAG：Ce^（3＋） phosphors with different ratios of sulfate ions could be easily obtained by calcining the as-synthesized precursor at 950 ℃ for 2 h,the YAG：Ce^（3＋） phosphors with an optimal mass ratio of 3.5 wt.%SDS had the highest emission intensity and the best dispersion behavior,and the fluorescence decay of the as-obtained YAG：Ce^（3＋） phosphors was related to the lattice defect,reabsorption and cross correlation.Furthermore,thermal quenching properties of the YAG：Ce^（3＋） phosphors and the YAG：Ce^（3＋） phosphors with 3.5 wt.%SDS were also discussed,indicating that the YAG：Ce^（3＋） with SDS phosphors could have potential applications in the daylight LEDs or warm white LEDs.展开更多
Lithium metal is one of the most promising anodes for next-generation batteries due to its high capacity and low reduction potential.However,the notorious Li dendrites can cause the short life span and safety issues,h...Lithium metal is one of the most promising anodes for next-generation batteries due to its high capacity and low reduction potential.However,the notorious Li dendrites can cause the short life span and safety issues,hindering the extensive application of lithium batteries.Herein,Li_(7)La_(3)Zr_(2)O_(12)(LLZO)ceramics are integrated into polyethylene oxide(PEO)to construct a facile polymer/inorganic composite solid-state electrolyte(CSSE)to inhibit the growth of Li dendrites and widen the electrochemical stability window.Given the feasibility of our strategy,the designed PEO-LLZO-LiTFSI composite solid-state electrolyte(PLLCSSE)exhibits an outstanding cycling property of 134.2 mAh g^(-1) after 500 cycles and the Coulombic efficiency of 99.1%after 1000 cycles at 1 C in LiFePO_(4)-Li cell.When cooperated with LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)cathode,the PLL-CSSE renders a capacity retention of 82.4%after 200 cycles at 0.2 C.More importantly,the uniform dispersion of LLZO in PEO matrix is tentative tested via Raman and FT-IR spectra and should be responsible for the improved electrochemical performance.The same conclusion can be drawn from the interface investigation after cycling.This work presents an intriguing solid-state electrolyte with high electrochemical performance,which will boost the development of all-solid-state lithium batteries with high energy density.展开更多
A cold model of top-bottom blown converter was set up to study the particle transport phenomenon and vibration performance of converter with bottom powder injection.The effect of bottom blowing flow rates,tuyere diame...A cold model of top-bottom blown converter was set up to study the particle transport phenomenon and vibration performance of converter with bottom powder injection.The effect of bottom blowing flow rates,tuyere diameters,arrangements,and powder to gas mass ratios on powder distribution and furnace body vibration was investigated.The results show that the bottom injection parameters and modes have significant effects on the particle transport behavior and furnace vibration.The powder dispersion uniformity and furnace vibration increase with the increase in bottom blowing tuyere diameters.In the lower range of bottom blowing flow rates and powder to gas mass ratios,the powder dispersion uniformity is improved with the increase in them.However,in the higher range,the excessive furnace vibration leads to reduction in uniformity in powder dispersion.When the bottom blowing tuyeres arrange at double arrangement of 0.5R(R refers to the radius of the bottom)distance between tuyere and center of bath bottom,the converter has optimal particle transport behavior and vibration performance.The vibration law of converter with bottom powder injection was revealed by deducing the empirical formulas of furnace vibration maximum amplitude.The vibration intensity is affected by Froude number,powder to gas mass ratio,and tuyere arrangement.展开更多
In this work, indium nitride(InN) films were successfully grown on porous silicon(PS) using metal oxide chemical vapor deposition(MOCVD) method. Room temperature photoluminescence(PL) and field emission scanning elect...In this work, indium nitride(InN) films were successfully grown on porous silicon(PS) using metal oxide chemical vapor deposition(MOCVD) method. Room temperature photoluminescence(PL) and field emission scanning electron microscopy(FESEM) analyses are performed to investigate the optical, structural and morphological properties of the InN/PS nanocomposites. FESEM images show that the pore size of InN/PS nanocomposites is usually less than 4 μm in diameter, and the overall thickness is approximately 40 μm. The InN nanoparticles penetrate uniformly into PS layer and adhere to them very well. Nitrogen(N) and indium(In) can be detected by energy dispersive spectrometer(EDS). An important gradual decrease of the PL intensity for PS occurs with the increase of oxidation time, and the PL intensity of PS is quenched after 24 h oxidization. However, there is a strong PL intensity of InN/PS nanocomposites at 430 nm(2.88 eV), which means that PS substrate can influence the structural and optical properties of the InN, and the grown InN on PS substrate has good optical quality.展开更多
As the key factor in brain development and fat metabolism,choline is widely present in foods,especially in health care and dairy products.In this study,a simple,rapid,sensitive,and cost-eff ective method was proposed ...As the key factor in brain development and fat metabolism,choline is widely present in foods,especially in health care and dairy products.In this study,a simple,rapid,sensitive,and cost-eff ective method was proposed for choline detection based on luminol derivate(L012)doped amino silica nanoparticles(L012@SiNPs-NH_(2)).L012@SiNPs-NH_(2)exhibited a 47-fold increase in the electrochemiluminescence(ECL)response and much better uniformity and dispersion compared with conventional luminol-doped silica nanoparticles(Luminol@SiNPs).We thus constructed an ECL biosensor based on the L012@SiNPs-NH_(2)/H_(2)O_(2)system,in which co-reactant H_(2)O_(2)is generated from dissolved oxygen during the process of oxidation of choline by choline oxidase.Significantly,the ECL biosensor shows a linear relationship between ECL intensity and choline concentration in the range of 1–5000μM,with a low limit of detection of 1μM.Additionally,the recovery tests from milk powders were conducted,demonstrating its practical application potential,which could be expanded to other oxidase-related analytes detection.It greatly broadened the application of L012 based nano-emitters in biological,food,and clinical analysis.展开更多
Orthopedic applications of Fe have been hindered by the insufficient degradation rate.Alloying with noble elements(such as Ag,Au,and Pt)to generate galvanic couples is a feasible approach.However,the direct preparatio...Orthopedic applications of Fe have been hindered by the insufficient degradation rate.Alloying with noble elements(such as Ag,Au,and Pt)to generate galvanic couples is a feasible approach.However,the direct preparation of homogenous alloys by mechanical alloying or metallurgy is difficult because of the differences in strength,density,and toughness.In this study,Ag_(2)O was selected as the precursor phase for incorporation into Fe to achieve a homogeneous distribution of Ag,which was then reduced in situ to Ag via a mechanochemical reduction reaction during mechanical alloying.The composite powders were printed as implants by selective laser melting,where a fast cooling rate contributed to the retention of the phase distribution of the obtained powder.The electrochemical tests showed that the Fe-Ag_(2)O implant had a high corrosion current density(21.88±0.12μA/cm^(2))and instantaneous corrosion rate(0.23±0.05 mm/year).Moreover,the implant exhibited a faster degradation rate(0.22 mm/year)than Fe(0.15 mm/year)and Fe-Ag(0.21 mm/year)after immersion for 28 d.The acceleration mechanism of the implant could be attributed to the uniformly distributed Ag particles triggering many galvanic couples with the Fe grains,which was confirmed by the observation of the corrosion surface.In addition,the composite implants exhibited good biocompatibility and antibacterial properties.展开更多
In this study,phosphorus doped graphene supported PtNiP nanocluster electrocatalyst(PtNiP/P-graphene)was successfully prepared via a simple hypophosphite-assisted co-reduction method.The improved anchoring force and i...In this study,phosphorus doped graphene supported PtNiP nanocluster electrocatalyst(PtNiP/P-graphene)was successfully prepared via a simple hypophosphite-assisted co-reduction method.The improved anchoring force and increased anchoring sites of graphene support result from phosphorus doping as well as size-confined growth effect of NaH_(2)PO_(2) leads to uniform dispersion of ultrafine PtNiP nanoclusters.Doped P also promotes the removal of CO-like intermediate by adjusting Pt electronic structure combining with alloyed Ni via electronic effects.As a result,the as-prepared PtNiP/P-graphene catalyst with more exposed active sites and optimized electronic structure of Pt alloy shows excellent electrocatalytic performances for methanol oxidation reaction(MOR)both in activity and durability in an acidic medium.展开更多
The three dimensional(3D) microstructures of Al-Bi alloys with different grain refiners(Al-5Ti-B, Al-3B and Al-3Ti) have been studied using synchrotron X-ray microtomography. The relationships between the microstructu...The three dimensional(3D) microstructures of Al-Bi alloys with different grain refiners(Al-5Ti-B, Al-3B and Al-3Ti) have been studied using synchrotron X-ray microtomography. The relationships between the microstructures and the corresponding wear behavior are verified through the friction and wear tests. The worn surfaces of the samples with grain refiners tested under 15 and 60 N loads are analyzed using Scanning Electron Microscopy(SEM). The results indicate that the addition of grain refiners is beneficial to the size and distribution of the Bi-rich particles in Al-Bi alloys. Compared with Al-5Ti-B and Al-3B grain refiners, the Bi-rich particles are more uniformly distributed and spherical with finer size with the addition of Al-3Ti grain refiner. The refinement renders the Al-20wt%Bi alloy refined by Al-3Ti the superior wear resistance with respect to those refined by Al-5Ti-B and Al-3B grain refiners, corresponding to the microstructures with fine and uniformly distributed Bi-rich particles in the Al matrix.展开更多
基金financially supported by the National Key Research and Development Program of China(No.2020YFB1713500)the Natural Science Foundation of Henan Province(No.242300420021)Open Fund of State Key Laboratory of Advanced Refractories(No.SKLAR202210)
文摘Polyvinylidene fluoride(PVDF)/garnet composite polymer electrolytes(CPEs) have shown great potential in the development of solid-state lithium metal batteries(SSLMBs) due to their excellent flexibility, high ionic conductivity and superior mechanical strength.However, uneven dispersion of garnet fillers in CPEs would lead to deterioration of lithium metal batteries(LMBs) performance and severely limit their widespread application. Considering the rapidly growing research of addressing above-mentioned issue, herein, recent progress in the design and fabrication of uniformly dispersed fillers in PVDF/garnet CPEs for high-performance SSLMBs is summarized. We firstly analyze the mechanism for the aggregation of inorganic fillers, and provide a detailed introduction to the strategies for solving the uneven dispersion of nanoparticles in solid electrolytes. Moreover, we also comprehensively summarize their applications in PVDF/garnet electrolytes and their impact on the electrochemical performance of SSLMBs. Finally, the application challenges and future prospects of PVDF/garnet CPEs in SSLMBs were also proposed to promote their further development. It is anticipated that this review could inspire ongoing research interest in rational designing and fabricating novel CPEs for high-performance SSLMBs.
基金financially supported by the National Natural Science Foundation of China(Nos.22468029,52274408,52204314)the Major Science and Technology Projects in Yunnan Province(No.202402AF080005)+1 种基金Yunnan Fundamental Research Projects(No.202201AW070014)the Program for Innovative Research Team in the University of ministry of Education of China(No.IRT_17R48)
文摘Ultrafine metal nanoparticles are crucial for various applications,such as energy storage,catalysis,electronics,and biomedicine,owing to their high surfaceto-volume ratio and unique electronic properties.However,conventional nanoparticle synthesis methods often face challenges like irregular shapes and agglomeration,leading to compromised functionality.To address these challenges,this paper introduces a novel,rapid,high-temperature thermal radiation heating for the ultrafast synthesis and dispersion of metal nanoparticles.Utilizing the heating properties of carbon materials,the direct Joule heating generated by them rises to 1800-2000 K within~200 ms,followed by cooling to room temperature at a rate of 2×10^(3)K s^(-1).
文摘A phase-field model is developed in this paper based on the similarity between mechanical fracture and dielectric breakdown.Electrical treeing is associated with the dielectric breakdown in solid dielectrics by the application of high voltages.Instead of explicitly tracing the propagation of conductive channel,this model initializes a continuous phase field to characterize the extent of damage.So far,limited research has been conducted for simulating the effect of nanofiller dispersion on electrical treeing.No study has modeled the effect of uniform and nonuniform dispersion of nanofillers with varying filler concentration on treeing.Since electrical treeing tends to decrease the breakdown strength of solid dielectrics therefore,nanofillers are widely used to distract the tree from a straight channel to distribute its energy in multiple paths.Diverting a straight treeing channel into mul-tiple paths reduces the chances of its propagation from live to dead-end hence,improving the breakdown strength.The physical and chemical nature of nanofillers has a crucial impact on increasing the resistance to treeing.In this paper,phase-field model is developed and used to simulate electrical treeing in polyethylene for varying concentrations of alumina nanofiller using COM-SOL Multiphysics.Tree inception time,tree-growth patterns,and corresponding changes in dielectric strength is studied for both dispersions.Electrical treeing under different concentrations of alumina nanofillers with uniform and nonuniform dispersion is investigated in polyethylene as a base material.It is observed that fillers with uniform dispersion increases the resistance to tree-ing and tree inception time.Highest resistance to treeing is observed by adding 1%nanoalumina uniformly in raw polyethylene.Moreover,in uniform dispersion the tree deflects into multiple branches earlier than nonuniform dispersion impeding the damage speed as well.
基金supported by the Natural Science Foundation of Sichuan Province(2023NSFSC0435,2024NSFSC0969)Key Laboratory of High Temperature Electromagnetic Materials and Structure of MOE,Wuhan University of Science and Technology,Wuhan 430081,PR China(Grant No.KB202408)Sichuan Agricultural University College Student Innovation Training Program Project Funding(No.S202310626096).
文摘The development of magnetic-electric synergistic microwave-absorbing materials represents a pivotal strategy for optimizing impedance matching,overcoming skin effects,and enhancing absorbing performance.Achieving a uniform distribution of magnetic particles within the dielectric material during preparation poses an immense challenge.This study employed PMMA-assisted electrospinning to achieve a homogeneous dispersion of magnetic particles on the surface of 1D or 2D carbon nanomaterials.The electrospinning process effectively blends the precursor of the magnetic material with the carbon nanomaterials while utilizing PMMA as a sacrificial template to anchor and evenly disperse the magnetic particles onto the carbon material’s surface.As anticipated,this approach ensures uniform modification of magnetic particles within the carbon matrix,thereby achieving ideal interface uniformity.Comparative analysis reveals that optimized samples incorporating carbon nanotubes and graphene exhibit significantly reduced minimum reflection loss by 294% and 313%,respectively,compared to those without electrospinning treatment.Further examination of the composite microstructure and electromagnetic parameters underscores that excellent dispersion of magnetic particles is crucial in improving impedance matching.This article presents a controllable and easily scalable preparation method for constructing interface-uniform dielectric-magnetic composite structures with exceptional homogeneity.
基金supported by the Research Fund for Doctoral Program of Higher Education of China(20120201130004)the Science and Technology Developing Project of Shaanxi Province(2015KW-001)+1 种基金the National Natural Science Foundation of China(61078058)Partially by the National Natural Science Foundation of China Major Research Plan on Nanomanufacturing(91323303)
文摘The sulfate ions modified YAG：Ce^（3＋） phosphors were prepared by co-precipitation method and characterized by X-ray diffraction,transmission electron microscopy,and photoluminescence.Effects of sulfate ions on the photoluminescence（PL） property of the as-prepared YAG：Ce^（3＋） phosphors were studied,with sodium dodecyl sulfate（SDS） being added to R^（3＋）（Ce^（3＋）,Y^（3＋）,Al^（3＋）） ions.Results indicated that pure YAG：Ce^（3＋） phosphors with different ratios of sulfate ions could be easily obtained by calcining the as-synthesized precursor at 950 ℃ for 2 h,the YAG：Ce^（3＋） phosphors with an optimal mass ratio of 3.5 wt.%SDS had the highest emission intensity and the best dispersion behavior,and the fluorescence decay of the as-obtained YAG：Ce^（3＋） phosphors was related to the lattice defect,reabsorption and cross correlation.Furthermore,thermal quenching properties of the YAG：Ce^（3＋） phosphors and the YAG：Ce^（3＋） phosphors with 3.5 wt.%SDS were also discussed,indicating that the YAG：Ce^（3＋） with SDS phosphors could have potential applications in the daylight LEDs or warm white LEDs.
基金financially supported partly by the National Key Research and Development Program of China(2018YFE0111600)the Tianjin Sci.&Tech.Program(17YFZCGX00560)the Young Elite Scientists Sponsorship Program by Tianjin(TJSQNTJ-2017-05)。
文摘Lithium metal is one of the most promising anodes for next-generation batteries due to its high capacity and low reduction potential.However,the notorious Li dendrites can cause the short life span and safety issues,hindering the extensive application of lithium batteries.Herein,Li_(7)La_(3)Zr_(2)O_(12)(LLZO)ceramics are integrated into polyethylene oxide(PEO)to construct a facile polymer/inorganic composite solid-state electrolyte(CSSE)to inhibit the growth of Li dendrites and widen the electrochemical stability window.Given the feasibility of our strategy,the designed PEO-LLZO-LiTFSI composite solid-state electrolyte(PLLCSSE)exhibits an outstanding cycling property of 134.2 mAh g^(-1) after 500 cycles and the Coulombic efficiency of 99.1%after 1000 cycles at 1 C in LiFePO_(4)-Li cell.When cooperated with LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)cathode,the PLL-CSSE renders a capacity retention of 82.4%after 200 cycles at 0.2 C.More importantly,the uniform dispersion of LLZO in PEO matrix is tentative tested via Raman and FT-IR spectra and should be responsible for the improved electrochemical performance.The same conclusion can be drawn from the interface investigation after cycling.This work presents an intriguing solid-state electrolyte with high electrochemical performance,which will boost the development of all-solid-state lithium batteries with high energy density.
基金supported by the National Natural Science Foundation of China(Nos.52074073 and U20A20272)the Fundamental Research Funds for the Central Universities,NEU(No.N2025017).
文摘A cold model of top-bottom blown converter was set up to study the particle transport phenomenon and vibration performance of converter with bottom powder injection.The effect of bottom blowing flow rates,tuyere diameters,arrangements,and powder to gas mass ratios on powder distribution and furnace body vibration was investigated.The results show that the bottom injection parameters and modes have significant effects on the particle transport behavior and furnace vibration.The powder dispersion uniformity and furnace vibration increase with the increase in bottom blowing tuyere diameters.In the lower range of bottom blowing flow rates and powder to gas mass ratios,the powder dispersion uniformity is improved with the increase in them.However,in the higher range,the excessive furnace vibration leads to reduction in uniformity in powder dispersion.When the bottom blowing tuyeres arrange at double arrangement of 0.5R(R refers to the radius of the bottom)distance between tuyere and center of bath bottom,the converter has optimal particle transport behavior and vibration performance.The vibration law of converter with bottom powder injection was revealed by deducing the empirical formulas of furnace vibration maximum amplitude.The vibration intensity is affected by Froude number,powder to gas mass ratio,and tuyere arrangement.
基金supported by the Xinjiang Science and Technology Project(No.2015211C275)
文摘In this work, indium nitride(InN) films were successfully grown on porous silicon(PS) using metal oxide chemical vapor deposition(MOCVD) method. Room temperature photoluminescence(PL) and field emission scanning electron microscopy(FESEM) analyses are performed to investigate the optical, structural and morphological properties of the InN/PS nanocomposites. FESEM images show that the pore size of InN/PS nanocomposites is usually less than 4 μm in diameter, and the overall thickness is approximately 40 μm. The InN nanoparticles penetrate uniformly into PS layer and adhere to them very well. Nitrogen(N) and indium(In) can be detected by energy dispersive spectrometer(EDS). An important gradual decrease of the PL intensity for PS occurs with the increase of oxidation time, and the PL intensity of PS is quenched after 24 h oxidization. However, there is a strong PL intensity of InN/PS nanocomposites at 430 nm(2.88 eV), which means that PS substrate can influence the structural and optical properties of the InN, and the grown InN on PS substrate has good optical quality.
基金supported by Natural Science Foundation of Shandong Province(ZR2022QB033)National Natural Science Foundation of China(22304015)+5 种基金the Scientifi c Research Start-up Fund of Binzhou Medical University(BY2022KYQD43BY2021KYQD21)Taishan Scholars Program of Shandong Province(tsqn202103112)the Development Plan of Youth Innovation Team in Colleges and Universities of Shandong Province(2021KJ052)the Supporting Fund for Leading Talents above Provincial Level in Yantai(10073803)the Collaborative Innovation Program of Hefei Science Center(2022HSC-CIP012)。
文摘As the key factor in brain development and fat metabolism,choline is widely present in foods,especially in health care and dairy products.In this study,a simple,rapid,sensitive,and cost-eff ective method was proposed for choline detection based on luminol derivate(L012)doped amino silica nanoparticles(L012@SiNPs-NH_(2)).L012@SiNPs-NH_(2)exhibited a 47-fold increase in the electrochemiluminescence(ECL)response and much better uniformity and dispersion compared with conventional luminol-doped silica nanoparticles(Luminol@SiNPs).We thus constructed an ECL biosensor based on the L012@SiNPs-NH_(2)/H_(2)O_(2)system,in which co-reactant H_(2)O_(2)is generated from dissolved oxygen during the process of oxidation of choline by choline oxidase.Significantly,the ECL biosensor shows a linear relationship between ECL intensity and choline concentration in the range of 1–5000μM,with a low limit of detection of 1μM.Additionally,the recovery tests from milk powders were conducted,demonstrating its practical application potential,which could be expanded to other oxidase-related analytes detection.It greatly broadened the application of L012 based nano-emitters in biological,food,and clinical analysis.
基金the National Natural Science Foundation of China(Grant Nos.52105352,51935014,52165043,and 82072084)the JiangXi Provincial Natural Science Foundation of China(Grant No.20224ACB204013)+2 种基金the Technology Innovation Platform Project of Shenzhen Institute of Information Technology 2020(Grant No.PT2020E002)the Guangdong Province Precision Manufacturing and Intelligent Production Education Integration Innovation Platform(Grant No.2022CJPT019)the Shccig-Qinling Program(Grant No.2022360702014891)。
文摘Orthopedic applications of Fe have been hindered by the insufficient degradation rate.Alloying with noble elements(such as Ag,Au,and Pt)to generate galvanic couples is a feasible approach.However,the direct preparation of homogenous alloys by mechanical alloying or metallurgy is difficult because of the differences in strength,density,and toughness.In this study,Ag_(2)O was selected as the precursor phase for incorporation into Fe to achieve a homogeneous distribution of Ag,which was then reduced in situ to Ag via a mechanochemical reduction reaction during mechanical alloying.The composite powders were printed as implants by selective laser melting,where a fast cooling rate contributed to the retention of the phase distribution of the obtained powder.The electrochemical tests showed that the Fe-Ag_(2)O implant had a high corrosion current density(21.88±0.12μA/cm^(2))and instantaneous corrosion rate(0.23±0.05 mm/year).Moreover,the implant exhibited a faster degradation rate(0.22 mm/year)than Fe(0.15 mm/year)and Fe-Ag(0.21 mm/year)after immersion for 28 d.The acceleration mechanism of the implant could be attributed to the uniformly distributed Ag particles triggering many galvanic couples with the Fe grains,which was confirmed by the observation of the corrosion surface.In addition,the composite implants exhibited good biocompatibility and antibacterial properties.
基金supported by the National Natural Science Foundation of China(Nos.21733004,U1601211,21673221,21733004,21603216,and U19A2016)the National Science and Technology Major Project(No.2018YFB1502703)+1 种基金Jilin Province Science and Technology Development Program(Nos.20170520150IH,20180101030JC,20190201270JC,and 20200201001JC)the Chinese Academy of Sciences STS Project(No.KFJ-STS-ZDTP-088).
文摘In this study,phosphorus doped graphene supported PtNiP nanocluster electrocatalyst(PtNiP/P-graphene)was successfully prepared via a simple hypophosphite-assisted co-reduction method.The improved anchoring force and increased anchoring sites of graphene support result from phosphorus doping as well as size-confined growth effect of NaH_(2)PO_(2) leads to uniform dispersion of ultrafine PtNiP nanoclusters.Doped P also promotes the removal of CO-like intermediate by adjusting Pt electronic structure combining with alloyed Ni via electronic effects.As a result,the as-prepared PtNiP/P-graphene catalyst with more exposed active sites and optimized electronic structure of Pt alloy shows excellent electrocatalytic performances for methanol oxidation reaction(MOR)both in activity and durability in an acidic medium.
基金supported by the National Natural Science Foundation of China(Grant Nos.51274054,U1332115,51271042,51375070 and 51401044)the Key Grant Project of Chinese Ministry of Education(Grant No.313011)+1 种基金the Science and Technology Planning Project of Dalian(Grant No.2013A16GX110)the Fundamental Research Funds for the Central Universities
文摘The three dimensional(3D) microstructures of Al-Bi alloys with different grain refiners(Al-5Ti-B, Al-3B and Al-3Ti) have been studied using synchrotron X-ray microtomography. The relationships between the microstructures and the corresponding wear behavior are verified through the friction and wear tests. The worn surfaces of the samples with grain refiners tested under 15 and 60 N loads are analyzed using Scanning Electron Microscopy(SEM). The results indicate that the addition of grain refiners is beneficial to the size and distribution of the Bi-rich particles in Al-Bi alloys. Compared with Al-5Ti-B and Al-3B grain refiners, the Bi-rich particles are more uniformly distributed and spherical with finer size with the addition of Al-3Ti grain refiner. The refinement renders the Al-20wt%Bi alloy refined by Al-3Ti the superior wear resistance with respect to those refined by Al-5Ti-B and Al-3B grain refiners, corresponding to the microstructures with fine and uniformly distributed Bi-rich particles in the Al matrix.
