Mechanical stability is of vital significance in commercial application of thermoelectric materials. The essential mechanical behaviours of a nanoporous skutterudite thermoelectric material have been studied by the mo...
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The relationship between nuclear graphite microstructure and its oxidation resistance underlines the importance of comprehensive oxidation characterization studies of the new grades of nuclear graphite. Periodic DFT c...
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The relationship between nuclear graphite microstructure and its oxidation resistance underlines the importance of comprehensive oxidation characterization studies of the new grades of nuclear graphite. Periodic DFT calculations are performed to model oxidation behavior of irradiated graphite. O 2 molecules adsorbed on perfect and defective graphite surfaces are calculated. The adsorptive energy of O 2 on defective graphite adsorption site with one carbon atom missing is approximately 10 times as strong as that on a defect-free perfect graphite surface. Monovacancy and divacancy on graphite surface can easily chemisorb O 2 molecule compared to perfect surface. Two oxidation processes including CO and CO 2 formation steps are analyzed. For symmetric monovacancy defect, three dangling C atoms are unsaturated and exhibit high adsorption ability, as well as reconstructed monovacancy and divacancy defects. These vacancy defects in irradiated graphite decrease oxidation resistance of nuclear graphite.
It was still a worldwide challenge to improve capacity, cycling stability and rate performance in consideration of the intrinsic properties and structure of material. Compared with other nanostructure, nanowire have d...
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It was still a worldwide challenge to improve capacity, cycling stability and rate performance in consideration of the intrinsic properties and structure of material. Compared with other nanostructure, nanowire have demonstrated better electrochemical performance in regard of electrochemical energy storage devices such as Li-ion battery, Li-air battery and supercapacitor, since it has unique anisotropy, large specific surface area, facile strain relaxation, fast axial electron transport and radial ion diffusion. Moreover, nanowire have shown the advantages in facile assembly and in-situ characterization of electrochemical energy storage devices. Based on the latest progress in nanowire materials, we mainly summarize the design, assembly and characterization of single nanowire electrochemical energy storage device and the optimization strategy of nanowire materials. In this article, we review the strategy in improving the electrochemical performance of one-dimensional structure. This article lays a foundation for the development and applications of nanowire materials in electrochemical energy storage field.
Over the last decade, significant effort has been devoted to the applications of hierarchically structured porous materials owing to their outstanding properties such as high surface area, excellent accessibility to a...
Over the last decade, significant effort has been devoted to the applications of hierarchically structured porous materials owing to their outstanding properties such as high surface area, excellent accessibility to active sites, and enhanced mass transport and diffusion. The hierarchy of porosity, structural, morphological and component levels in these materials is key for their high performance in all kinds of applications. The introduction of hierarchical porosity into materials has led to a significant improvement in the performance of materials. Herein, recent progress in the applications of hierarchically structured porous materials from energy conversion and storage, catalysis, photocatalysis, adsorption, separation, and sensing to biomedicine is reviewed. Their potential future applications are also highlighted. We particularly dwell on the relationship between hierarchically porous structures and properties, with examples of each type of hierarchically structured porous material according to its chemical composition and physical characteristics. The present review aims to open up a new avenue to guide the readers to quickly obtain in-depth knowledge of applications of hierarchically porous materials and to have a good idea about selecting and designing suitable hierarchically porous materials for a specific application. In addition to focusing on the applications of hierarchically porous materials, this comprehensive review could stimulate researchers to synthesize new advanced hierarchically porous solids.
Good crystalline of ATO thin films is necessary to improve the electrical and optical properties. In this paper, ATO thin films were fabricated using PLD method at high temperature of 550 °C, and the effect of la...
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An equiatomic CoCrFeNiMnAl high-entropy alloy was synthesized by mechanical alloying, and alloying behaviors, microstructure and annealing behaviors were investigated. It was found that a solid solution with refined m...
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The transformation of recognition signals into regulating macroscopic behaviors of biological entities (e.g., biomolecules and cells) is an extraordinarily challenging task in engineering interfacial properties of art...
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The transformation of recognition signals into regulating macroscopic behaviors of biological entities (e.g., biomolecules and cells) is an extraordinarily challenging task in engineering interfacial properties of artificial materials. Recently, there has been extensive research for dynamic biointerfaces driven by biomimetic techniques. Weak interactions and chirality are two crucial routes that nature uses to achieve its functions, including protein folding, the DNA double helix, phospholipid membranes, photosystems, and shell and tooth growths. Learning from nature inspires us to design dynamic biointerfaces, which usually take advantage of highly selective weak interactions (e.g., synergetic chiral H-bonding interactions) to tailor their molecular assemblies on external stimuli. Biomolecules can induce the conformational transitions of dynamic biointerfaces, then drive a switching of surface characteristics (topographic structure, wettability, etc.), and eventually achieve macroscopic functions. The emerging progresses of dynamic biointerfaces are reviewed and its role from molecular recognitions to biological functions highlighted. Finally, a discussion is presented of the integration of dynamic biointerfaces with the basic biochemical processes, possibly solving the big challenges in life science.
In this paper, composites of Ni(OH)2/reduced graphene oxides (rGO) were prepared by chemical co-precipitation method, by which Ni(OH)2 hexagonal nanoplates were successfully inserted into the layers of reduced graphen...
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Nanowires have attracted increasing interests because one-dimensional (1-D) nanomaterials can offer a range of unique advantages in many energy related fields.[1-6] For previous Iithium battery applications, bulk mate...
Nanowires have attracted increasing interests because one-dimensional (1-D) nanomaterials can offer a range of unique advantages in many energy related fields.[1-6] For previous Iithium battery applications, bulk materials made of nanowires were usually used as the *** the electrochemical properties could be improved, the fast capacity fading is still one of the key issues and the intrinsic reasons are not clear until *** situ probing has been increasingly employed in nanotechnology.[7-8] To understand intrinsic reason of capacity fading,we designed the single nanowire electrochemical devices for in situ probing the direct relationship between electrical transport, structure, and electrochemical properties of the single nanowire electrode, which may push the fundamental limits of the nanowire materials for energy storage applications.[9] Our results show that conductivity of the nanowire electrode decreased during theelectrochemical reaction, which limits the cycle life of the devices.
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