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viscoelastic inorganic glass as solid-state electrolyte for batteries

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Journal of Materiomics 2024年第3期10卷 707-708页

作者： Yaoyu Ren Ce-Wen Nan School of Materials Science and Engineering State Key Lab of New Ceramics and Fine ProcessingTsinghua UniversityBeijing100084China

A most recent exciting research result in the area of solid-state batteries that has been accepted for publication by the journal Nature Energy is *** research designed a new type of inorganic solid electrolyte named“viscoelastic inorganic glass(VIGLAS)”electrolyte with the compositions of LiAlCl_(2.5)O_(0.75)and NaAlCl_(2.5)O_(0.75).The newly developed solid electrolyte material showcases an excep-tional degree of deformability at room temperature,high ionic conductivity(>1 mS/cm at room tem-perature)and high oxidation stability(up to 4.3 V ***^(+)/Li or Na^(+)/Na).Using it as a catholyte enables a facile fabrication and a stable operation under practical stack pressure(<0.1 MPa)of all-solid-state *** represents a new path in the design of promising solid electrolytes for realizing high performance all-solid-state batteries.

关键词： viscoelastic Inorganic glass Solid electrolyte Lithium battery Sodium battery

INVESTIGATION OF THE THICKNESS VARIABILITY AND MATERIAL HETEROGENEITY EFFECTS ON FREE VIBRATION OF THE viscoelastic CIRCULAR PLATES

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Acta Mechanica Solida Sinica 2013年第1期26卷 83-98页

作者： M.Shariyat A.A.Jafari M.M.Alipour Faculty of Mechanical Engineering K.N.Toosi University of Technology

The present study deals with free vibration analysis of variable thickness viscoelastic circular plates made of heterogeneous materials and resting on two-parameter elastic foundations in addition to their edge conditions. It is assumed that the viscoelastic material properties vary in the transverse and radial directions simultaneously. The complex modulus approach is employed in conjunction with the elastic-viscoelastic correspondence principle to obtain the solution. The governing equations are solved by means of a power series solution. Finally, a sensitivity analysis including evaluation of effects of various edge conditions, thickness variations, coefficients of the elastic foundation, and material loss factor and heterogeneity on the natural frequencies and modal loss factors is accomplished.

关键词： viscoelastic variable thickness circular plate natural frequencies elastic foundation material heterogeneity power series solution

Length-based separation of Bacillus subtilis bacterial populations by viscoelastic microfluidics

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Microsystems & Nanoengineering 2022年第1期8卷 149-159页

作者： Ping Liu Hangrui Liu Lucie Semenec Dan Yuan Sheng Yan Amy K.Cain Ming Li Suqian University Suqian 223800China School of Engineering Macquarie UniversitySydneyNSW 2109Australia Department of Physics and Astronomy Macquarie UniversitySydneyNSW 2109Australia ARC Centre of Excellence in Synthetic Biology Department of Molecular ScienceMacquarie UniversitySydneyNSW 2109Australia Centre for Regional and Rural Futures Deakin UniversityGeelongVIC 3216Australia Institute for Advanced Study Shenzhen UniversityShenzhen 518060China Biomolecular Discovery Research Centre Macquarie UniversitySydneyNSW 2109Australia

In this study,we demonstrated the label-free continuous separation and enrichment of Bacillus subtilis populations based on length using viscoelastic ***,a gram-positive,rod-shaped bacterium,has been widely used as a model organism and an industrial *** can be arranged in different morphological forms,such as single rods,chains,and clumps,which reflect differences in cell types,phases of growth,genetic variation,and changing environmental *** ability to prepare *** populations with a uniform length is important for basic biological studies and efficient industrial ***,we systematically investigated how flow rate ratio,poly(ethylene oxide)(PEO)concentration,and channel length affected the length-based separation of *** *** lateral positions of *** cells with varying morphologies in a straight rectangular microchannel were found to be dependent on cell length under the co-flow of viscoelastic and Newtonian ***,we evaluated the ability of the viscoelastic microfluidic device to separate the two groups of *** cells by length(i.e.,1-5μm and>5μm)in terms of extraction purity(EP),extraction yield(EY),and enrichment factor(EF)and confirmed that the device could separate heterogeneous populations of bacteria using elasto-inertial effects.

关键词： viscoelastic separation straight

Precise Integration Method of C-integral for Linear viscoelastic Solids with Crack

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上海交通大学学报 2004年第z2期38卷 25-31页

作者： Liu Jinghua Wu Changchun Huang Ruoyu School of Naval Arch. Ocean & Civil Engineering Shanghai Jiaotong Univ. Shanghai200030 China School of Naval Arch. Ocean & Civil Engineering Shanghai Jiaotong Univ. Shanghai200030 China School of Naval Arch. Ocean & Civil Engineering Shanghai Jiaotong Univ. Shanghai200030 China

Generally, viscoelastic solid constitutive equation can be written into differential form and integral form. From differential form of constitutive equation the mathematical representation of the state space equation can be derived. Due to the state space equation, general constitutive equation can be solved by precise integration method that can be used in many fields with the advantages of highly precision and convenience. For linear viscoelastic solids with crack, the finite elements program of the precise integration method for viscoelastic solid is developed, which appears to be efficient and precise. C-integral is used to be the characterising parameter.

关键词： precise integration C-integral viscoelastic finite element

Investigation of the viscoelastic Effect on the Metzner and Otto Coefficient Through LDA Velocity Measurements

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Chinese Journal of Chemical Engineering 2001年第1期9卷 77-83页

作者： M.Jnhangiri M.R.Golkar-Narenji N.Montazerin S.Savarmand DepartmentofChemical DepartmentofwMechanicalEngineering AmirkabirUniversityofTechnology（Tehranpolytechnic）No.424HafezAve.Tehran15914I.R.Iran

The Metzner and Otto correlation is the single practical method for incorporating non-Newtonian effects in the mixing process. In this article, the Metzner and Otto' s idea, the role of viscoelasticity on the Metzner and Otto coefficient, ks, effects of flow regime on ks and the determination of fc3 for Rushton turbine impeller have been studied using the direct method of the laser Doppler anemometry (LDA) velocity measurement for the case of viscoelastic liquids. The normalized mean tangential velocity profiles are independent of Rushton turbine impeller speeds. Contrary to literature findings, it is shown that the variation of local shear rate against the impeller speed is better correlated by the power equation, i.e. y= k'a Nb' , in the transition region, i. e. - 30 viscoelastic liquids is given which is very helpful in designing of the mixing of both viscoelastic and inelastic non-Newtonian fluids through relating rheological properties to kinematical and dynamical parameters of the mixing process.

关键词： viscoelastic mixing Rushton turbine impeller laser Doppler anemometry (LDA) Metzner and Otto coefficient

Identifying the viscoelastic properties of soft matter from the indentation response of a hard film-soft substrate system

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Science China(Physics,Mechanics & Astronomy) 2020年第4期63卷 108-118页

作者： YanWei Liu YueGuang Wei Hao Long Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China

The indentation technique is widely used in measuring the mechanical properties of soft matter at the microscale or nanoscale,but still faces challenges by these unique properties as well as the consequent strong surface adhesion, including the strong nonlinear effect, unclear judgment of the contact point, difficulties in estimating the contact area, and the risk of the indenter piercing the sample. Here we propose a two-step method to solve these problems: lay a hard film on a soft matter, and obtain the viscoelastic properties of this soft matter through the indentation response of this composite structure. We first establish a theoretical indentation model of the hard film-soft substrate system based on the theory of plates, elastic-viscoelastic correspondence principle and Boltzmann superposition principle. To verify the correctness of this method, we measure the mechanical properties of the methyl vinyl silicone rubber(MVSR) covered by a Cu nanofilm. Finally, we test the effectiveness and error sensitivity of this method with the finite element method(FEM). The results show that our method can accurately measure the mechanical properties of soft matter, while effectively circumventing the problems of the traditional indentation technique.

关键词： viscoelastic properties soft matter theoretical indentation model indentation technique finite element method

Dispersion and attenuation of torsional wave in a viscoelastic layer bonded between a layer and a half-space of dry sandy media

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Applied Mathematics and Mechanics(English Edition) 2017年第9期38卷 1313-1328页

作者： P.ALAM S.KUNDU S.GUPTA Department of Applied Mathematics Indian Institute of Technology(Indian School of Mines)Dhanbad 826004JhrkhandIndia

Propagation of a torsional wave in a doubly-layered half-space structure of an initially stressed heterogeneous viscoelastic layer sandwiched between a layer and a half-space of heterogeneous dry sandy media is studied. A closed form complex expression for the velocity profile is obtained under effective boundary conditions. The real part of the complex expression provides a dispersion equation, and the imaginary part yields a damping equation. The derived dispersion and damped equations are in well agreement with the classical Love wave condition. In addition, to study the effect of the dissipation factor, the attenuation coefficient, the sandy parameters, the initial stress, the hetero- geneity parameters, and the thickness ratio parameter, some noteworthy contemplations are made by numerical calculations and graphical visuals. The results of this paper may present a deeper insight into the behaviour of propagation phenomena in heterogeneous viscoelastic and heterogeneous dry sandy materials that can provide a theoretical guide for the design and optimization in the field of earthquake engineering. The study also reveals that the presence of a damping part due to viscoelasticity affects the torsional wave propagation significantly.

关键词： attenuation dissipation viscoelastic sandy heterogeneous initial stress,phase damping

Stationary response of stochastic viscoelastic system with the right unilateral nonzero offset barrier impacts

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Chinese Physics B 2019年第1期28卷 195-204页

作者： Deli Wang Wei Xu Xudong Gu Department of Applied Mathematics Northwestern Polytechnical UniversityXi’an 710072China Department of Engineering Mechanics Northwestern Polytechnical UniversityXi’an 710072China

The stationary response of viscoelastic dynamical system with the right unilateral nonzero offset barrier impacts subjected to stochastic excitations is investigated. First, the viscoelastic force is approximately treated as equivalent terms associated with effects. Then, the free vibro-impact(VI) system is absorbed to describe the periodic motion without impacts and quasi-periodic motion with impacts based upon the level of system energy. The stochastic averaging of energy envelope(SAEE) is adopted to seek the stationary probability density functions(PDFs). The detailed theoretical results for Van der Pol viscoelastic VI system with the right unilateral nonzero offset barrier are solved to demonstrate the important effects of the viscoelastic damping and nonzero rigid barrier impacts condition. Monte Carlo(MC) simulation is also performed to verify the reliability of the suggested approach. The stochastic P-bifurcation caused by certain system parameters is further explored. The variation of elastic modulus from negative to zero and then to positive witnesses the evolution process of stochastic P-bifurcation. From the vicinity of the common value to a wider range, the relaxation time induces the stochastic P-bifurcation in the two interval schemes.

关键词： viscoelastic system right unilateral nonzero offset barrier impacts stochastic averaging of energy envelope(SAEE) stochastic P-bifurcation

Direct numerical simulation of the viscoelastic channel flow using Giesekus model with variable parameters

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Journal of Hydrodynamics 2019年第2期31卷 326-332页

作者： Wei-guo Gu Yu Li De-zhong Wang School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The paper presents a direct numerical simulation(DNS)for the drag-reducing channel flow using the Giesekus model with variable *** is assumed that the relaxation time in the constitutive equation is varied depending on the local shear *** maximal drag reduction rate is obtained when variable parameters are applied in the Giesekus model at a high Weissenberg *** Reynolds shear stress is reduced when the Weissenberg number *** this case,the turbulence generation and transportation are further weakened and increasingly approach to the values in the experiments.

关键词： viscoelastic fluid Giesekus model direct numerical simulation(DNS) Variable parameters