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Elastic interaction between inclusions and tunable periodicity of superlattice structure in nanowires

Applied Mathematics and Mechanics(English Edition) 2020年第10期41卷 1461-1478页

作者： Yang YANG Yong NI CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230026China

The elastic stress distribution and the variation of the elastic energy with spacing between two inclusions of arbitrary sizes in an infinite isotropic cylindrical rod are obtained by an analytical approach and the phase field microelasticity(PFM)*** results show a near-attraction and far-repulsion elastic interaction between two inclusions with hydrostatic *** critical spacing,at which the interaction changes from attraction to repulsion,is on the order of the radius of the rod,dependent on the length and Poisson’s ratio of ***,the elastic energy calculations and PFM simulation results indicate that applying the local radial stress on the rod surface can modulate the elastic interaction between inclusions and adjust the periodicity of the superlattice nanowire *** can provide some guidelines for the tunable construction of superlattice nanowire structures.

关键词： elastic interaction inclusion critical spacing superlattice structure

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One-step electrochemical in-situ Li doping and LiF coating enable ultra-stable cathode for sodium ion batteries

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Journal of Energy Chemistry 2023年第7期82卷 228-238,I0005页

作者： Jiameng Feng Chaoliang Zheng De Fang Jianling Li State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Despite of the higher energy density and inexpensive characteristics,commercialization of layered oxide cathodes for sodium ion batteries(SIBs)is limited due to the lack of structural stability at the high ***,the one-step electrochemical in-situ Li doping and LiF coating are successfully achieved to obtain an advanced Na0.79Lix[Li_(0.13)Ni_(0.20)Mn_(0.67)]O_(2)@LiF(NaLi-LNM@LiF)cathode with superlattice *** results demonstrate that the Li^(+)doped into the alkali metal layer by electrochemical cycling act as"pillars"in the form of Li-Li dimers to stabilize the layered *** supplementation of Li to the superlattice structure inhibits the dissolution of transition metal ions and lattice ***,the in-situ LiF coating restrains side reactions,reduces surface cracks,and greatly improves the cycling *** electrochemical in-situ modification strategy significantly enhances the electrochemical performance of the *** NaLi-LNM@LiF exhibits high reversible specific capacity(170.6 m A h g^(-1)at 0.05 C),outstanding capacity retention(92.65%after 200 cycles at 0.5 C)and excellent rate performance(80 mA h g^(-1)at 7 C)in a wide voltage range of 1.5-4.5 *** novel method of in-situ modification by electrochemical process will provide a guidance for the rational design of cathode materials for SIBs.

关键词： Sodium ion batteries Layered oxides In-situ Li doping In-situ LiF coating superlattice structure

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Tunable nano Peltier cooling device from geometric effects using a single graphene nanoribbon

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Frontiers of physics 2014年第4期9卷 472-476页

作者： Wan-Ju Li Dao-Xin Yao E. W. Carlson Department of Physics Purdue University West Lafayette IN 47907 USA State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University Guangzhou 510275 China

Based on the phenomenon of curvature-induced doping in graphene we propose a class of Peltier cooling devices, produced by geometrical effects, without gating. We show how a graphene nanorib- bon laid on an array of curved nano cylinders can be used to create a targeted and tunable cooling device. Using two different approaches, the Nonequilibrium Green＇s Function （NEGF） method and experimental inputs, we predict that the cooling kW/cm2, on par with the best known techniques power of such a device can approach the order of using standard superlattice structures. The structure proposed here helps pave the way toward designing graphene electronics which use geometry rather than gating to control devices.

关键词： Peltier cooling device graphene nanoribbon superlattice structure grapheneelectronics cooling power Nonequilibrium Green's Function (NI3GE)

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