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Research on the Development of Fibroin and Nano-Fiber from Silk Cocoons for Regenerated Tissue Engineering Applications by Electro-Spinning
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作者 Md Kamrul Hasan Xinbo Ding 《Advances in Nanoparticles》 CAS 2024年第1期1-9,共9页
In this paper, the main goal is to prepare silk fibroin nano-fiber, which is used for regenerated tissue applications. Silk scaffold nano-fibers made by electro-spinning technology can be used in regenerated tissue ap... In this paper, the main goal is to prepare silk fibroin nano-fiber, which is used for regenerated tissue applications. Silk scaffold nano-fibers made by electro-spinning technology can be used in regenerated tissue applications. The purpose of the research is to prepare a silk-fibroin nano-fiber solution for potential applications in tissue engineering. Using a degumming process, pure silk fibroin protein is extracted from silk cocoons. The protein solution for fibroin is purified, and the protein content is determined. The precise chemical composition, exact temperature, time, voltage, distance, ratio, and humidity all have a huge impact on degumming, solubility, and electro-spinning nano-fibers. The SEM investigates the morphology of silk fibroin nano-fibres at different magnifications. It also reveals the surface condition, fiber orientation, and fiber thickness of the silk fibroin nano-fiber. The results show that regenerated silk fibroin and nano-fiber can be used in silk fibroin scaffolds for various tissue engineering applications. 展开更多
关键词 Silk fibroin SCAFFOLD electro-spinning nano-fiber Tissue Engineering
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Spectra of spontaneous Raman scattering in taper-drawn micro/nano-fibers 被引量:1
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作者 徐颖鑫 崔亮 +5 位作者 李小英 郭骋 李宇航 徐忠扬 王力军 方伟 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第12期266-270,共5页
We study the spontaneous Raman scattering (RS) in taper-drawn micro/nano-fibers (MNFs) by employing the photon counting technique. The spectra of RS in five MNFs, which are fabricated by using different heating fl... We study the spontaneous Raman scattering (RS) in taper-drawn micro/nano-fibers (MNFs) by employing the photon counting technique. The spectra of RS in five MNFs, which are fabricated by using different heating flames (hydrogen flame or butane flame) and with different diameters, are measured within a frequency shift range of 1435 cm- 1_3200 cm- 1. From the measured spectra, we observe the RS peaks originated from silica and a unique RS peak with a frequency shift of - 2905 cm-1 (- 87.2 THz). Unlike the former ones, the latter one is not observable in conventional optical fibers. Furthermore, the unique peak becomes obvious and starts to rapidly increase with the decrease of the diameter of MNFs when the diameter is smaller than 2 μm, and the intensity of the unique peak significantly depends on the heating flame used in the fabricating process. Our investigation is useful for the entanglement generation or optical sensing using taper-drawn MNFs. 展开更多
关键词 nonlinear optics micro/nano-fibers Raman scattering
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An energetic nano-fiber composite based on polystyrene and 1,3,5-trinitro-1,3,5-triazinane fabricated via electrospinning technique
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作者 Mahmoud Abdelhafiz Ahmed K.Hussein +1 位作者 Waleed F.Khalil Ahmed Elbeih 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第9期1-8,共8页
Electrospinning is a simple technique used to fabricate polymeric nano-fibrous membranes.These nano-fibers have found a wide range of valuable applications in the biomedical field.However,it has not been utilized with... Electrospinning is a simple technique used to fabricate polymeric nano-fibrous membranes.These nano-fibers have found a wide range of valuable applications in the biomedical field.However,it has not been utilized with solid high explosives yet.Herein,the electrospinning technique has been used to fabricate polystyrene(PS)/1,3,5-trinitro-1,3,5-triazinane(RDX)composite nanofibers.The governed electrospinning parameters,voltage,distance from the collector,flow rate,mandrel rotating speed,time,and solution concentration,that greatly affect the morphology of the obtained nanofibers were optimized.The fabricated PS/RDX nano-fibers were characterized using scanning electron microscopy(SEM),X-ray diffractometer(XRD),and Fourier Transform Infrared(FTIR)spectroscopy.The impact and friction sensitivities of PS/RDX were also measured.The thermal behavior of the prepared composite and the pure materials were studied by the thermal gravimetric analysis technique(TGA).SEM results proved the fabrication of PS/RDX fibers in the nano-size via electrospinning.FTIR spectroscopy confirmed the existence of the characteristic functional groups of both PS and RDX in the composite nano-fibers.XRD sharp peaks showed the conversion of amorphous PS into crystalline shape via electrospinning and also confirmed the formation of PS/RDX composite.The PS fibers absorbed the heat and increased the onset decomposition of the pure RDX from 181.5 to 200.7℃in the case of PS/RDX fibers.Interestingly,PS/RDX nano-fibers showed the relatively low impact and friction sensitivities of 100 J and 360 N respectively.These results could introduce PS/RDX nanofibrous composite in the field of explosives detection with high levels of safety. 展开更多
关键词 ELECTROSPINNING nano-fibers 1 3 5-Trinitro-1 3 5-triazinane(RDX) Polystyrene(PS) Sensitivity
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Constructing long-cycling crystalline C_(3)N_(4)-based carbonaceous anodes for sodium-ion battery via N configuration control 被引量:1
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作者 Ying Wang Hongguan Li +5 位作者 Shuanlong Di Boyin Zhai Ping Niu Antonios Kelarakis Shulan Wang Li Li 《Carbon Energy》 SCIE EI CAS CSCD 2024年第1期159-171,共13页
Carbon nitrides with two-dimensional layered structures and high theoretical capacities are attractive as anode materials for sodium-ion batteries while their low crystallinity and insufficient structural stability st... Carbon nitrides with two-dimensional layered structures and high theoretical capacities are attractive as anode materials for sodium-ion batteries while their low crystallinity and insufficient structural stability strongly restrict their practical applications.Coupling carbon nitrides with conductive carbon may relieve these issues.However,little is known about the influence of nitrogen(N)configurations on the interactions between carbon and C_(3)N_(4),which is fundamentally critical for guiding the precise design of advanced C_(3)N_(4)-related electrodes.Herein,highly crystalline C_(3)N_(4)(poly(triazine imide),PTI)based all-carbon composites were developed by molten salt strategy.More importantly,the vital role of pyrrolic-N for enhancing charge transfer and boosting Na+storage of C_(3)N_(4)-based composites,which was confirmed by both theoretical and experimental evidence,was spot-highlighted for the first time.By elaborately controlling the salt composition,the composite with high pyrrolic-N and minimized graphitic-N content was obtained.Profiting from the formation of highly crystalline PTI and electrochemically favorable pyrrolic-N configurations,the composite delivered an unusual reverse growth and record-level cycling stability even after 5000 cycles along with high reversible capacity and outstanding full-cell capacity retention.This work broadens the energy storage applications of C_(3)N_(4) and provides new prospects for the design of advanced all-carbon electrodes. 展开更多
关键词 ANODE highly crystalline C_(3)N_(4) N configuration sodium-ion batteries ultra-long cyclic stability
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Possibility of the Application of the Ultra-long Electromagnetic Wave Remote Sensor to Marine Geological Exploration 被引量:6
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作者 HOU Guiting QIAN Xianglin +1 位作者 WANG Shuyuan SUN Jing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2000年第2期391-393,共3页
The ultra-long electromagnetic wave remote sensing technique developed by Peking University is one of new future techniques, which can detect the submarine geological information from the depth of 20 to 10000 m below ... The ultra-long electromagnetic wave remote sensing technique developed by Peking University is one of new future techniques, which can detect the submarine geological information from the depth of 20 to 10000 m below the surface by receiving natural ultra-long electromagnetic waves (n Hz to n 100 Hz). The new remote sensor is composed of three parts: a main instrument with a portable computer, an antenna with an amplifier and an external power. 展开更多
关键词 ultra-long electromagnetic wave new remote sensor lithologic interface submarine information
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Enhanced photocatalytic properties of ultra-long nanofiber synthesized from pure titanium powders 被引量:2
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作者 Tao, Jie Dong, Xiang +2 位作者 Zhu, Hong Tao, Haijun He, Pingting 《Rare Metals》 SCIE EI CAS CSCD 2012年第1期39-42,共4页
Using Ti powder as reagent,ultra-long TiO2 nanofibers were prepared via hydrothermal method in NaOH solution.The samples were char-acterized respectively by means of field emission scanning electron microscopy (FESEM)... Using Ti powder as reagent,ultra-long TiO2 nanofibers were prepared via hydrothermal method in NaOH solution.The samples were char-acterized respectively by means of field emission scanning electron microscopy (FESEM),transmission electron microscopy (TEM) with selected area electron diffraction (SAED),and X-ray diffraction (XRD).The diameter and the length of the ultra-long TiO2 nanofiber were ~100 nm and >200μm,respectively.The ultra-long TiO2 nanofibers were anatase after heat treatment at 450 ?C for 1 h.Moreover,the optical properties of the products were investigated by UV-visible light absorption spectrum.Furthermore,methyl orange was used as a target molecule to estimate the photocatalytic activity of the specimens.Under the same testing conditions,the photocatalytic activity of the ultra-long TiO2 nanofibers was higher than that of P25.Direct electrical pathway and improved light-harvesting efficiency were crucial for the superior photocatalytic activity of the ultra-long TiO2 nanofibers. 展开更多
关键词 TiO2 HYDROTHERMAL ultra-long nanofiber PHOTOCATALYTIC
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Preparation of Carbon Nano-fiber Washcoat on Porous Silica Foam as Structured Catalyst Support 被引量:1
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作者 刘平乐 L.Lefferts 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2006年第3期294-300,共7页
This paper reports how a hairy layer of carbon nano-fibers can be prepared on the macro-porous silica foam produced by the sphere templating method. Firstly, three-dimensional close-packed crystals of polystyrene sphe... This paper reports how a hairy layer of carbon nano-fibers can be prepared on the macro-porous silica foam produced by the sphere templating method. Firstly, three-dimensional close-packed crystals of polystyrene spheres are assembled on porous disk substrate by vacuum filtration or evaporation. The polystyrene template is annealed slightly above the glass transition temperature in order to strengthen the colloidal crystal and ensure interconnection of the spheres so as to obtain porous materials with open structure. Following the treatment of hexdecyltrimethylammonium bromide, the polystyrene template is filled with silica colloidal solution, which solidifies in the cavities. Then the polystyrene particles are removed by calcination at 843K, leaving behind porous silica foam. Scanning electron microscopy images demonstrate that silica foam has uniform and open structured pores. Nickel particles were deposited on porous silica foam layer by the dipping method and porous carbon nano-fiber washcoat was prepared by catalytic decomposition of ethene over small nickel particles. 展开更多
关键词 sphere template colloidal crystal silica foam carbon nano-fiber WASHCOAT
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Nonlinear Ultra-Long Wave and Its Stability 被引量:1
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作者 何建中 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 1994年第1期91-100,共10页
A stability of a nonlinear ultra-long wave and its solution are discussed in this paper by employing Burger model which is subject to heat resource. It is of interest noted that the wave solution can be described by a... A stability of a nonlinear ultra-long wave and its solution are discussed in this paper by employing Burger model which is subject to heat resource. It is of interest noted that the wave solution can be described by an equation of KDV or MKDV and that conditions for the existence of the solution are related to characteristic divergences. In addition, a wave velocity expression for nonlinear ultra-long waves and some diagnostic correlations among wave parameters have been obtained. 展开更多
关键词 ultra-long wave STABILITY Burger model
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Preparation of Carbon Nano-fiber Washcoat on Porous Silica Foam as Structured Catalyst Support
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作者 刘平乐 L. Lefferts 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2006年第3X期294-300,共7页
This paper reports how a hairy layer of carbon nano-fibers can be prepared on the macro-porous silica foam produced by the sphere templating method. Firstly, three-dimensional close-packed crystals of polystyrene sphe... This paper reports how a hairy layer of carbon nano-fibers can be prepared on the macro-porous silica foam produced by the sphere templating method. Firstly, three-dimensional close-packed crystals of polystyrene spheres are assembled on porous disk substrate by vacuum filtration or evaporation. The polystyrene template is annealed slightly above the glass transition temperature in order to strengthen the colloidal crystal and ensure inter- connection of the spheres so as to obtain porous materials with open structure. Following the treatment of hexde- cyltrimethylammonium bromide, the polystyrene template is filled with silica colloidal solution, which solidifies in the cavities. Then the polystyrene particles are removed by calcination at 843K, leaving behind porous silica foam. Scanning electron microscopy images demonstrate that silica foam has uniform and open structured pores. Nickel particles were deposited on porous silica foam layer by the dipping method and porous carbon nano-fiber washcoat was prepared by catalytic decomposition of ethene over small nickel particles. 展开更多
关键词 SPHERE TEMPLATE COLLOIDAL crystal SILICA foam carbon nano-fiber WASHCOAT
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Synthesis of Ordered Ultra-long Manganite Nanowires via Electrospinning Method
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作者 郑俊 杜恺 +5 位作者 肖迪 周正阳 魏文刚 陈金杰 殷立峰 沈健 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第9期116-119,共4页
We develop a new electrospinning method to prepare ultra-long ordered La1-xSrxMnO3 (LSMO) nanowires. The length is up to several centimeters and is only limited by the size of the collector. The well-ordered straigh... We develop a new electrospinning method to prepare ultra-long ordered La1-xSrxMnO3 (LSMO) nanowires. The length is up to several centimeters and is only limited by the size of the collector. The well-ordered straight-line structure ensures the transport measurement, which is impossible to be carried out for the random nanowires fabricated by the traditional electrospinning method. Magnetic and transport measurements indicate that the physical properties of the LSMO nanowires depend sensitively on the doping concentration. At the optimum doping, the LSMO wires are ferromagnetic at room temperature with a metal-insulator transition temperature close to room temperature. Magnetic force microscopy studies are also performed to provide a microscopic view of these ultra-long nanowires. 展开更多
关键词 of on is by as for Synthesis of Ordered ultra-long Manganite Nanowires via Electrospinning Method LSMO
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New insight into the ultra-long lifetime of excitons in organic-inorganic perovskite: Reverse intersystem crossing
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作者 Guanghao Meng Yantao Shi +4 位作者 Xiangyuan Wang Wei Wang Shufeng Wang Min Ji Ce Hao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第5期1496-1500,共5页
Recently, an effective exciton diffusion length L exceeding 100μm has been reported for organic- inorganic halide perovskites owing to both the high mobility and ultra-long lifetime of the excitons; however, the orig... Recently, an effective exciton diffusion length L exceeding 100μm has been reported for organic- inorganic halide perovskites owing to both the high mobility and ultra-long lifetime of the excitons; however, the origin of ultra-long L is still unclear in nature. In some photoelectric materials, reverse intersystem crossing (RISC) from the triplet to the singlet state can enhance the quantum yield of pho- toluminescence greatly. In this study, our theoretical investigation indicated that the energy difference △E_st between the singlet state and the triplet state of CH_3NH_3Pbl_3 was less than 0.1 eV, which represents one crucial prerequisite for the occurrence of RISC. Meanwhile, the experimental results showed that the photoluminescence lifetime increased with the increasing temperature, a typical feature of RISC. Based on this study, we put forward the hypothesis that the ultra-long lifetime of excitons in organic-inorganic halide perovskite might be caused by the RISC process. This may provide a new insight into the important photophysical properties of such novel photovoltaic materials. 展开更多
关键词 Inorganic-organic halide perovskite PHOTOPHYSICS Photoluminescence Reverse intersystem crossing ultra-long lifetime
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Stability and activity of carbon nanofiber-supported catalysts in the aqueous phase reforming of ethylene glycol 被引量:3
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作者 T. van Haasterecht C. C. I. Ludding +1 位作者 K. P. de Jong J. H. Bitter 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第2期257-269,共13页
Nickel, cobalt, copper and platinum nanoparticles supported on carbon nano-fibers were evaluated with respect to their stability, catalytic activity and selectivity in the aqueous phase reforming of ethylene glycol (... Nickel, cobalt, copper and platinum nanoparticles supported on carbon nano-fibers were evaluated with respect to their stability, catalytic activity and selectivity in the aqueous phase reforming of ethylene glycol (230 ℃, autogenous pressure, batch reactor). The initial surface-specific activities for ethylene glycol reforming were in a similar range but decreased in the order of Pt (15.5 h-1 ) 〉Co(13.0 h 1 ) 〉Ni(5.2 h-1) while the Cu catalyst only showed low dehydrogenation activity. The hydrogen molar selectivity decreased in the order of Pt (53%)〉Co(21%)〉Ni (15%) as a result of the production of methane over the latter two catalysts. Over the Co catalyst acids were formed in the liquid phase while alcohols were formed over Ni and Pt. Due to the low pH of the reaction mixture, especially in the case of Co (as a result of the formed acids), significant cobalt leaching occurs which resulted in a rapid deactivation of this catalyst. Investigations of the spent catalysts with various techniques showed that metal particle growth is responsible for the deactivation of the Pt and Ni catalysts. In addition, coking might also contribute to the deactivation of the Ni catalyst. 展开更多
关键词 carbon nano-fiber catalyst deactivation aqueous phase reforming non-noble metal catalyst
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Hydrogen Bond-Assisted Ultra-Stable and Fast Aqueous NH_(4)^(+)Storage 被引量:4
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作者 Xikun Zhang Maoting Xia +4 位作者 Haoxiang Yu Junwei Zhang Zhengwei Yang Liyuan Zhang Jie Shu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第9期193-208,共16页
Aqueous ammonium ion batteries are regarded as eco-friendly and sustainable energy storage systems.And applicable host for NH_(4)^(+)in aqueous solution is always in the process of development.On the basis of density ... Aqueous ammonium ion batteries are regarded as eco-friendly and sustainable energy storage systems.And applicable host for NH_(4)^(+)in aqueous solution is always in the process of development.On the basis of density functional theory calcula-tions,the excellent performance of NH_(4)^(+)insertion in Prussian blue analogues(PBAs)is proposed,especially for copper hexacyanoferrate(CuHCF).In this work,we prove the outstanding cycling and rate performance of CuHCF via electrochemical analyses,delivering no capacity fading during ultra-long cycles of 3000 times and high capacity retention of 93.6%at 50 C.One of main contributions to superior performance from highly reversible redox reaction and structural change is verified during the ammoniation/de-ammoniation progresses.More importantly,we propose the NH_(4)^(+)diffusion mechanism in CuHCF based on con-tinuous formation and fracture of hydrogen bonds from a joint theoretical and experimental study,which is another essential reason for rapid charge transfer and superior NH_(4)^(+)storage.Lastly,a full cell by coupling CuHCF cathode and polyaniline anode is constructed to explore the practical application of CuHCF.In brief,the outstanding aqueous NH_(4)^(+)storage in cubic PBAs creates a blueprint for fast and sustainable energy storage. 展开更多
关键词 Aqueous ammonium ion batteries Copper hexacyanoferrate ultra-long cycling performance Excellent rate performance Hydrogen bonds
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Stabilization and Evaluation of Modified Nanofiber Flour Wood on the Properties of Cement-Baszd Mortar 被引量:2
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作者 Fadhel Aloulou Sabrine Alila Habib Sammouda 《Journal of Renewable Materials》 SCIE 2019年第8期763-774,共12页
The influence of nanofiberwood on the properties of the fresh condition of cement based mortars is not known in detail,despite recent advances in nanocellulose technology and it is related composite materials.Nanofibe... The influence of nanofiberwood on the properties of the fresh condition of cement based mortars is not known in detail,despite recent advances in nanocellulose technology and it is related composite materials.Nanofiber wood from industrial waste,produced by high-pressure homogenization,was used as cement partial replacement for cement paste at a content ranging from 0%to 2%by weight of cement.The effect of the nanofiber wood content on the porosity,the compressive strength and the degree of hydration of the cement was investigated.Results have shown an improvement in the compressive strength by more than 50%with 1%of added fiber wood.The chemical modification of nanofibers wood by grafting of chains alkyls in their surfaces can reduce the quantity of water absorbed by the sample.The addition of an anionic additive(SDBS)in the water of mixing improves of more the surface of samples by minimizing the size of pores by emulsion effect,from where the absorption of water reduces.The degree of hydration of the cement has increased with the cellulose content containing nanofibrils.The analyze revealed that the presence of nanofiber wood favored the hydration of the cement by producing more calcium silicate gel and portlandite,probably the main reason for this improvement in compressive strength. 展开更多
关键词 CEMENT nano-fiber ADJUVANT surfactant EMULSION hydratation thermal conductivity
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Preparation of chain copper oxide nanoparticles by microwave 被引量:2
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作者 LI Zaiyuan LIU Yan +1 位作者 GONG Panwei ZHAI Yuchun 《Rare Metals》 SCIE EI CAS CSCD 2007年第5期476-481,共6页
Cu(OH)2 nano-fibers were prepared by chemical precipitation with CuSO4·5H2O and NaOH as raw materials. The Cu(OH)2 nano-fibers have a diameter of 10-30 nm and a length of 1-6 μm. The reaction conditions were... Cu(OH)2 nano-fibers were prepared by chemical precipitation with CuSO4·5H2O and NaOH as raw materials. The Cu(OH)2 nano-fibers have a diameter of 10-30 nm and a length of 1-6 μm. The reaction conditions were as follows: the concentration of CuSO4 solution was 0.1 mol·L^-1,NaOH solution 4 mol·L^-1,the dropping rate of the NaOH solution 50 mL·min^-1,the reaction temperature 20℃the pH value of the reaction terminal 13,and the stirring rate 1200 r·min^-1. The chain nano-CuO grains were obtained through the microwave radiation of the Cu(OH)2 nano-fibers. 展开更多
关键词 copper oxide Cu(OH)2 nano-fibers MICROWAVE CHAIN
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Ethylene Polymerization with Palygorskite Supported Nickel-Diimine Catalyst 被引量:2
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作者 严小伟 王靖岱 +1 位作者 阳永荣 张雷 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第3期361-366,共6页
A nickel-diimine catalyst [N, N'-bis(2,6-diisopropylphenyl)-1,4-diaza-2,3-dimethyl-1, 3-butadiene nickel dibromide, DMN] was supported on palygorskite clay for ethylene slurry polymerization. The effect of support... A nickel-diimine catalyst [N, N'-bis(2,6-diisopropylphenyl)-1,4-diaza-2,3-dimethyl-1, 3-butadiene nickel dibromide, DMN] was supported on palygorskite clay for ethylene slurry polymerization. The effect of supporting methods on the catalyst impregnation was studied and compared. Pretreatment of the support with methylalumi-noxane (MAO) followed by DMN impregnation gave higher catalyst loading and catalytic activity than the direct impregnation of DMN. Catalyst activity as high as 5.42×105g PE·molNi-1·h-1 was achieved at ethylene pressure of 6.87×105 Pa and polymerization temperature of 20℃. In particular, the morphological change of the support during MAO treatment was characterized and analyzed. It was found that nano-fiber clusters formed during the support pretreatment, which increased the surface area of the support and favored the impregnation of the catalyst. The investigation of polymerization behavior of supported catalyst revealed that the polymerization rate could be kept at a relatively high level for a long time, different from the homogeneous catalyst. By analyzing the SEM photographs of the polymer produced by the supported catalyst, the morphological evolution of polymer particles was preliminarily studied. 展开更多
关键词 ethylene polymerization nickel diimine catalyst palygorskite support nano-fiber clusters
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Impacts of SST and SST Anomalies on Low-Frequency Oscillation in the Tropical Atmosphere 被引量:2
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作者 何金海 宇婧婧 沈新勇 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2007年第3期377-382,共6页
Considering the multiscale character of LFO effects of SST on LFO in the tropical atmosphere (low-frequency oscillation) in the tropical atmosphere, the are discussed by using an absolute ageostrophic, baroclinic mo... Considering the multiscale character of LFO effects of SST on LFO in the tropical atmosphere (low-frequency oscillation) in the tropical atmosphere, the are discussed by using an absolute ageostrophic, baroclinic model. Here, SST effects include sea surface heating and forcing of SST anomalies (SSTAs). Studies of the influences of sea surface heating on LFO frequency and stability show that sea surface heating can slow the speed of waves and lower their frequency when SST is comparatively low; while higher SST leads to unstable waves and less periods of LFO. Since the impact of a SSTA on ultra-long waves is more evident than that on kilometer-scale waves, long-wave approximation is used when we continue to study the effect of SSTAs. Results indicate that SSTAs can lead to a longer period of LFO, and make waves unstable. In other words, positive (negative) SSTAs can make waves decay (grow). 展开更多
关键词 Low-Frequency Oscillation (LFO) sea surface heating sea surface temperature anomaly (SSTA) ultra-long wave kilometer-scale precipitation
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Dynamic effective elastic modulus of polymer matrix composites with dense piezoelectric nano-fibers considering surface/interface effect 被引量:1
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作者 FANG XueQian HUANG MingJuan +2 位作者 ZHU ZiTao LIU JinXi FENG WenJie 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第1期125-132,共8页
Based on effective field method,the dynamic effective elastic modulus of polymer matrix composites embedded with dense piezoelectric nano-fibers is obtained,and the interacting effect of piezoelectric surfaces/interfa... Based on effective field method,the dynamic effective elastic modulus of polymer matrix composites embedded with dense piezoelectric nano-fibers is obtained,and the interacting effect of piezoelectric surfaces/interfaces around the nano-fibers is considered.The multiple scattering effects of harmonic anti-plane shear waves between the piezoelectric nano-fibers with surface/interface are averaged by effective field method.To analyze the interacting results among the random nano-fibers,the problem of two typical piezoelectric nano-fibers is introduced by employing the addition theorem of Bessel functions.Through numerical calculations,the influence of the distance between the randomly distributed piezoelectric nano-fibers under different surface/interface parameters is analyzed.The effect of piezoelectric property of surface/interface on the effective shear modulus under different volume fractions is also examined.Comparison with the simplified cases is given to validate this dynamic electro-elastic model. 展开更多
关键词 piezoelectric nanocomposites dense nano-fibers dynamic effective properties effective field method
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Building ultra-stable K–Te battery by molecular regulation 被引量:1
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作者 Jiawan Zhou Dongyang Shen +1 位作者 Xinzhi Yu Bingan Lu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第6期100-107,I0004,共9页
Tellurium (Te) is an ideal electrode for potassium ion batteries (PIBs) owing to its excellent electronic conductivity and high volumetric capacity.However,the Te electrode is prone to capacity fading as the shuttle e... Tellurium (Te) is an ideal electrode for potassium ion batteries (PIBs) owing to its excellent electronic conductivity and high volumetric capacity.However,the Te electrode is prone to capacity fading as the shuttle effect.To address this challenge,we propose molecular regulated Se–Te solid solutions on N-doped porous carbon as the PIBs electrode.After optimizing the Se content in Se–Te solid solutions,the resultant SeTe_(6.8) on N-doped porous carbon (SeTe_(6.8)@C) delivered a capacity of over 400 mAh g^(-1) with a flat plateau of 1.0 V at 500 m A g^(-1).It also achieved a superiorly long cycle life,running for more than 1600 cycles (over 7 months with 0.015%degeneration per cycle) at 100 mA g^(-1) and excellent rate performance (179.9 mAh g^(-1) at 10000 mA g^(-1)).This remarkable electrochemical energy storage of the Te electorde likely arises from suppression of the shuttle effect after doping the Te with strongly electronegative Se atoms (forming K_(s)Te_(3) which is not easily soluble in electrolyte).This study presents a fresh approach for designing and developing ultra-stable Te-based electrodes for PIBs and beyond. 展开更多
关键词 Se–Te solid solutions ultra-long cycle life Potassium tellurium battery Molecular regulation
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Enabling Extraordinary Rate Performance for Poorly Conductive Oxide Pseudocapacitors 被引量:1
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作者 Mozaffar Abdollahifar Hao-Wen Liu +6 位作者 Chia-Hsin Lin Yu-Ting Weng Hwo-Shuenn Sheu Jyh-Fu Lee Meng-Lin Lu Yen-Fa Liao Nae-Lih Wu 《Energy & Environmental Materials》 2020年第3期405-413,共9页
Pseudocapacitive transition metal oxides(PTMOs)have the advantages of high areal capacitance and material density suitable for high-energy supercapacitor devices,but they are typically marred by insufficient rate perf... Pseudocapacitive transition metal oxides(PTMOs)have the advantages of high areal capacitance and material density suitable for high-energy supercapacitor devices,but they are typically marred by insufficient rate performance,which in turn deteriorates cyclic stability at high current levels.Using the example of spinel manganese oxide,herein we demonstrate that a pseudocapacitive oxide electrode of remarkable rate performance and cyclic stability may be realized by adopting oxide nanocrystallites,which are derived based on a novel solution chemistry,and carbon additive(CA)nanoparticles with highly uniform of size distributions.Precisely controlling the particle morphology and size distribution of the active material and conductive additive(CA)in the nanometer range can maximize the density of active material-CA-electrolyte three-phase contact points,thus facilitating synchronized electron and cation flow for the completion of surface faradaic reactions.The resultant Mn3O4 pseudocapacitive electrode exhibits rate capability and cycle stability,including 60%capacity retention at 60 A g-1 and no capacity fade over 100000 cycles under dynamic current densities,far superior to the state-of-the-art PTMO electrodes.The electrode design strategy is in general applicable to pseudocapacitors containing poorly conductive active materials. 展开更多
关键词 high-rate performance pseudocapacitor electrodes single nanoparticles three-phase contact point ultra-long cycle life
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