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Exploring van der Waals materials with high anisotropy:geometrical and optical approaches

Light(science & Applications) 2024年第4期13卷 645-653页

作者： Aleksandr s.slavich Georgy A.Ermolaev Mikhail K.Tatmyshevskiy Adilet N.Toksumakov Olga G.Matveeva Dmitriy V.Grudinin Kirill V.Voronin Arslan Mazitov Konstantin V.Kravtsov Alexander V.syuy Dmitry M.Tsymbarenko Mikhail s.Mironov sergey M.Novikov Ivan Kruglov Davit A.Ghazaryan Andrey A.Vyshnevyy Aleksey V.Arsenin valenty. s.volkov Kostya s.Novoselov Moscow Center for Advanced studies Kulakova str.20Moscow 123592Russia. Emerging Technologies Research Center XPANCEOInternet CityEmmay TowerDubaiUnited Arab Emirates. Donostia International Physics Center(DIPC) Donostia/San-Sebastián 20018Spain. Institute of Materials Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland. Department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia. Laboratory of Advanced Functional Materials Yerevan State UniversityYerevan 0025Armenia. National Graphene Institute(NGI) University of ManchesterManchester M139PLUK. Department of Materials science and Engineering National University of SingaporeSingapore 03-09 EASingapore. Institute for Functional Intelligent Materials National University of Singapore117544 SingaporeSingapore

The emergence of van der Waals(vdW)materials resulted in the discovery of their high optical,mechanical,and electronic anisotropic properties,immediately enabling countless novel phenomena and *** success inspired an intensive search for the highest possible anisotropic properties among vdW ***,the identification of the most promising among the huge family of vdW materials is a challenging quest requiring innovative ***,we suggest an easy-to-use method for such a survey based on the crystallographic geometrical perspective of vdW materials followed by their optical *** our approach,we found As2s3 as a highly anisotropic vdW *** demonstrates high in-plane optical anisotropy that is~20%larger than for rutile and over two times as large as calcite,high refractive index,and transparency in the visible range,overcoming the century-long record set by *** these benefits,As2s3 opens a pathway towards nextgeneration nanophotonics as demonstrated by an ultrathin true zero-order quarter-wave plate that combines classical and the Fabry–Pérot optical phase ***,our approach provides an effective and easy-to-use method to find vdW materials with the utmost anisotropic properties.

关键词： anisotropy anisotropic high

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Reinforced interface endows the lithium anode with stable cycle at high-temperature of 80℃

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Journal of Energy Chemistry 2023年第3期78卷 325-332,I0010页

作者： Yuhao Zhu Xieyu Xu Qingpeng Guo Yu Han Haolong Jiang Huize Jiang Hui Wang Pavel V.Evdokimov Olesya O.Kapitanova valenty. s.volkov Yongjing Wang shizhao Xiong Chunman Zheng Kai Xie Xingxing Jiao Yangyang Liu College of Aerospace science and Engineering National University of Defense TechnologyChangsha 410073HunanChina Department of Materials science Lomonosov Moscow State UniversityMoscow 119991Russia Center for Photonics and 2D Materials Moscow Institute of Physics and TechnologyDolgoprudnyMoscow 141701Russia state Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina Autonomous Noncommercial Organization"ID&As:Inter-Disciplinary&Advanced studies Center" Moscow 127495Russia

Embracing ultrahigh theoretical capacity of 3860 mA h g^(-1)and the lowest reduction potential of-3.04 V(versus standard hydrogen electrode),lithium(Li) is considered as the "holy grail" material for pursuing higher energy density,of which application has been challenged due to the unstable interface caused by the non-uniform electrodeposition as well as high chemical *** at higher temperature can be recommended to uniform electrodeposition of Li ***,the intrinsic side-reaction between Li metal anode and electrolyte is inevitably aggravated and thus fosters the failure of Li metal anode rapidly with uneven ***,a kind of temperature-tolerated ionic liquid(1-methyl-3-ethylimidazole bis(fluorosulfo nyl)imide/lithium bis(trifluoromethylsulfo nyl)imide,EF/LT)based electrolyte that matrixed with poly(vinylidene fluoride-hexafluoropropylene) was designed to maintain the interfacial stabilization of Li metal due to the weak interfacial reaction and uniform electrodeposition at high temperature of 80℃.It is the matter that the 660-h cycle with lower polarization is achieved with EF/LT-based electrolyte at temperature of 80 ℃ and the full cell embraces outstanding cyclic performance,without capacity fading within 100 ***,a door for practical application of Li metal anode for higher energy density as the carbon neutrality progresses in the blooming human society has been opened gradually.

关键词： Lithium metal anode Uniform electrodeposition High-temperature operation Temperature-tolerated electrolyte Ionic liquid

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Electro-chemo-mechanical design of polymer matrix in composited LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cathode endows solid-state batteries with superior performance

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Journal of Energy Chemistry 2023年第3期78卷 277-282,I0009页

作者： Haolong Jiang Xieyu Xu Qingpeng Guo Hui Wang Jiayi Zheng Yuhao Zhu Huize Jiang Olesya O.Kapitanova valenty. s.volkov Jialin Wang Yaqi Chen Yongjing Wang Yu Han Chunman Zheng Kai Xie shizhao Xiong Yangyang Liu Xingxing Jiao College of Aerospace science and Engineering National University of Defense TechnologyChangsha 410073HunanChina Department of Materials science Lomonosov Moscow State UniversityLeninskie gory 1Moscow 119991Russia Center for Photonics and 2D Materials Moscow Institute of Physics and Technology9 Institutskiy per.DolgoprudnyMoscow Region 141701Russia state Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) cathode material has been widely concerned due to its high voltage,high specific capacity and excellent rate performance,which is considered as one of the most promising cathode materials for the next generation of high-energy-density solid-state lithium ***,serious electro-chemo-mechanical degradation of Nickel-rich cathode during cycling,especially at a high voltage(over 4.5 V),constrains their large-scale ***,using the multiphysical simulation,highly-conductive polymer matrix with spontaneous stress-buffering effect was uncovered theoretically for reinforcing the electrochemical performance of composited NCM81 1 cathode through the visualization of uniform concentration distribution of Li-ion coupled with improved stress field inside NCM811 ***,polyacrylonitrile(PAN) and soft polyvinylidene fluoride(PVDF) were selected as the polymer matrix to fabricate the composited NCM811 cathode(PVDFPAN@NCM811) for improving the electrochemical performance of the solid-state NMC811|Li full cells,which can maintain high capacity over 146.2 mA h g^(-1)after 200 cycles at a high voltage of 4.5 ***,designing a multifunctional polymer matrix with high ionic conductivity and mechanical property can buffer the stress and maintain the integrity of the structure,which can be regarded as the door-opening avenue to realize the high electrochemical performance of Ni-rich cathode for solidstate batteries.

关键词： Ni-rich cathode solid-state batteries Interfacial modiﬁcation in electro-chemo-mechanics Multi-physical simulation

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A sTOCHAsTIC ALGORITHM FOR FAULT INVERsE PROBLEMs IN ELAsTIC HALF sPACE WITH PROOF OF CONVERGENCE

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Journal of Computational Mathematics 2022年第6期40卷 955-976页

作者： Darko volkov Department of Mathematical sciences WPIWorcesterMassachusettsUSA

A general stochastic algorithm for solving mixed linear and nonlinear problems was introduced in[11].We show in this paper how it can be used to solve the fault inverse problem,where a planar fault in elastic half-space and a slip on that fault have to be reconstructed from noisy surface displacement *** the parameter giving the plane containing the fault denoted by m and the regularization parameter for the linear part of the inverse problem denoted by C,both modeled as random variables,we derive a formula for the posterior marginal of *** C as a random variable allows to sweep through a wide range of possible values which was shown to be superior to selecting a fixed value[11].We prove that this posterior marginal of m is convergent as the number of measurement points and the dimension of the space for discretizing slips *** put,our proof only assumes that the regularized discrete error functional for processing measurements relates to an order 1 quadrature rule and that the union of the finite-dimensional spaces for discretizing slips is *** proof relies on trace class operator theory to show that an adequate sequence of determinants is uniformly *** also explain how our proof can be extended to a whole class of inverse problems,as long as some basic requirements are ***,we show numerical simulations that illustrate the numerical convergence of our algorithm.

关键词： Mixed Linear and nonlinear inverse problems Bayesian modeling Regularization Approximation to solutions by quadrature Convergence of Random Variables Elasticity equations in unbounded domains

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Ultrafast Optomechanical Terahertz Modulators Based on stretchable Carbon Nanotube Thin Films

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Ultrafast science 2023年第6期3卷 1-9页

作者： Maksim I.Paukov Vladimir V.starchenko Dmitry V.Krasnikov Gennady A.Komandin Yuriy G.Gladush sergey s.Zhukov Boris P.Gorshunov Albert G.Nasibulin Aleksey V.Arsenin valenty. s.volkov Maria G.Burdanova Center for Photonics and 2D Materials Moscow Institute of Physics and TechnologyDolgoprudny.Russia skolkovo Institute of science and Technology MoscowRussia Prokhorov General Physics Institute of the Russian Academy of sciences MoscowRussia Laboratory of Advanced Functional Materials Yerevan State UniversityYerevanArmenia Institute of solid state Physics of the Russian Academy of sciences ChernogolovkaRussia.

For terahertz wave applications,tunable and rapid modulation is highly *** studied by means of optical pump-terahertz probe spectroscopy,single-walled carbon nanotube(sWCNT)thin films demonstrated ultrafast carrier recombination lifetimes with a high relative change in the signal under optical excitation,making them promising candidates for high-speed ***,combination of sWCNT thin films and stretchable substrates facilitated studies of the sWCNT mechanical properties under strain and enabled the development of a new type of an optomechanical *** applying a certain strain to the sWCNT films,the effective sheet conductance and therefore modulation depth can be fine-tuned to optimize the designed *** exhibited a photoconductivity change of approximately 2 times of magnitude under the strain because of the structural modification in the sWCNT *** was used to control the terahertz signal with a modulation depth of around 100%without strain and 65%at a high strain operation of 40%.The sensitivity of modulators to beam polarization is also shown,which might also come in handy for the design of a stretchable *** results give a fundamental grounding for the design of high-sensitivity stretchable devices based on sWCNT films.

关键词： strain excitation films

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structure and heterogeneity of habitat determine diet of predators despite prey abundance:similar response in Long-eared,short-eared Owls and Common Kestrels

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Avian Research 2023年第1期14卷 54-61页

作者： Tatyana Kovinka Alexander sharikov Tatyana Massalskaya sergey volkov Zoology and Ecology Department Moscow State Pedagogical UniversityKibalchicha Str.6-3129164MoscowRussid severtsov Institute of Ecology and Evolution Russian Academy of SciencesMoscow119071Russia

According to one of the theses of optimal foraging theory,main prey species abundance in the hunting area is the main factor determining the diet and habitat choices of birds of *** other factors can also be *** habitat structure influences the predators’diets as *** this study we examined the influence of habitat structure on diet compositions of three species of birds:Long-eared Owl(Asio otus),short-eared Owl(***)and Common Kestrel(Falco tinnunculus).The study was carried out from 2007 to 2019 in a 48 km2area of the Crane’s Homeland Reserve,Moscow Region,*** habitat structures of model species’hunting territories(ratio of different types of landscape elements)were classified in module"semi-Automatic Classification Plugin"based on the QGIs.A boosted regression tree analysis identified that the share of the main prey species in the diet is primarily determined by the landscape structure of hunting *** largest share of Common Vole(Microtus arvalis)in birds’diet was determined by the shrubs area(15%of hunting area),the meadow area(75%),the habitat heterogeneity(70%)and the arable land area(5%).The same predictors determined the largest share of Root Vole(Microtus oeconomus):the shrubs area 25%,the meadow area 70%,and the arable land area 3%.The annual mean abundance of prey species did not determine their importance in the diet of birds of ***,the main prey abundance in the hunting area is not a determining factor for the formation of diet composition of birds of prey.

关键词： Birds of prey diet Boosted regresion tnee Habitat strnocture efiect Prey sbundance

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sTUDIEs ON THE sELF-DIFFUsION OF WATER ETHANOL MIXTURE IN CHITOsAN PERVAPORATION MEMBRANE WITH PULsED FIELD GRADIENT NMR DATA

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Chinese Journal of Polymer science 2002年第4期20卷 317-323页

作者： VitalijI.volkov Karpov Institute of Physical Chemistry 103064 Moscow Russia

The self-diffusion of water, ethanol and water-ethanol mixtures in chitosan (Cs) membranes crosslinked by aqueous H2sO4 solution and uncrosslinked membrane was measured using pulsed-field gradient (PFG) nuclear magnetic resonance (NMR) spectroscopy to obtain the partial solubilities and self-diffusion coefficients. An attempt was made to explain the transport properties of water and ethanol through the Cs membrane. It was concluded that there are two types of channel water and ethanol diffusate transfer. The water was localized in the hydrophilic ionic region formed by the ionized groups, and the ethanol was localized in the hydrophobic amorphous network of the polymer. There was a good agreement between. the separation factors estimated from PFG-NMR data and those obtained by pervaporation testing.

关键词： chitosan membrane pervaporation pulsed-field gradient NMR

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A NUMERICAL BOUNDARY EIGENVALUE PROBLEM FOR ELAsTIC CRACKs IN FREE AND HALF sPACE

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Journal of Computational Mathematics 2011年第5期29卷 543-573页

作者： Darko volkov Department of Mathematical sciences Worcester Polytechnic Institute Worcester MA 01609 USA

We present in this paper a numerical method for hypersingular boundary integral equations. This method was developed for planar crack problems： additional edge singularities are known to develop in that case. This paper includes a rigorous error analysis proving the convergence of our numerical scheme. Three types of examples are covered： the Laplace equation in free space, the linear elasticity equation in free space, and in half space.

关键词： Hypersingular boundary integral equations Numerical error analysis Eigen-value problems Faults in free space and half space somigliana tensor of the second kindin free space and in half space.

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Inflatable Models

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Journal of Computer science & Technology 2006年第2期21卷 154-158页

作者：李凌 Vasily volkov Department of Computing Curtin University of Technology Perth WA 6845 Australia

A physically-based model is presented for the simulation of a new type of deformable objects-inflatable objects, such as shaped balloons, which consist of pressurized air enclosed by an elastic surface. These objects have properties inherent in both 3D and 2D elastic bodies, as they demonstrate the behaviour of 3D shapes using 2D formulations. As there is no internal structure in them, their behaviour is substantially different from the behaviour of deformable solid objects. We use one of the few available models for deformable surfaces, and enhance it to include the forces of internal and external pressure. These pressure forces may also incorporate buoyancy forces, to allow objects filled with a low density gas to float in denser media. The obtained models demonstrate rich dynamic behaviour, such as bouncing, floating, deflation and inflation.

关键词： inflatable models physically based modelling physically based animation

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Chaotic Driven Tunneling in Rectangular Double-Well

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Communications in Computational Physics 2006年第1期1卷 81-99页

作者： V.L.Golo Yu.s.volkov Department of Mechanics and Mathematics Moscow State UniversityMoscow 119899 GSP-2Russia

We consider a charged particle confined in a one-dimensional rectangular doublewell potential,driven by an external periodic excitation at frequencyΩand with amplitude *** find that there is the regime of the parametric resonance due to the modulation of the amplitude A at the frequencyωprm,which results in the change in the population dynamics of the energy *** analysis relies on the Dirac system of Hamiltonian equations that are equivalent to the schr¨odinger *** a finite dimensional approximation to the Dirac system,we construct the foliation of its phase space by subsets F_(ab)given by constraints a≤N_(0)≤b on the occupation probabilities N0 of the ground state,and describe the tunneling by frequenciesνab of the system’s visiting subsets F_(ab).The frequenciesνab determine the probability density and thus the shannon entropy,which has the maximum value at the resonant frequencyω=ω*** reconstruction of the state-space of the system’s dynamics with the help of the shaw-Takens method indicates that the quasi-periodic motion breaks down at the resonant valueωprm.

关键词： Tunneling double-well parametric resonance

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