The Experts below are selected from a list of 18345 Experts worldwide ranked by ideXlab platform
Zhibin Shen - One of the best experts on this subject based on the ideXlab platform.
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vibration analysis of a single layered Graphene Sheet based mass sensor using the galerkin strip distributed transfer function method
Acta Mechanica, 2016Co-Authors: Renwei Jiang, Zhibin Shen, Guojin TangAbstract:The free vibration of a single-layered Graphene Sheet (SLGS)-based mass sensor is analyzed using the Galerkin strip distributed transfer function method (GSDTFM) based on the nonlocal Kirchhoff plate theory. The dynamic equations of the SLGS-based mass sensor are formulated, and the semi-analytical solutions of the frequency shift are computed with the GSDTFM. The effects of the nonlocal parameter, the attached nanoparticle locations, the plate side length, as well as the boundary conditions, on the frequency shift are studied. The simulated results show that the frequency shift of the SLGS-based mass sensor becomes smaller when the nonlocal parameter increases. The SLGS-based mass sensor is more sensitive when the attached nanoparticle is closer to the SLGS center or the side length of the SLGS becomes smaller. The boundary conditions strongly affect the frequency shift. Stiffer boundary condition causes larger frequency shift.
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transverse vibration of circular Graphene Sheet based mass sensor via nonlocal kirchhoff plate theory
Computational Materials Science, 2014Co-Authors: Shiming Zhou, Liping Sheng, Zhibin ShenAbstract:Abstract The potential of circular Graphene Sheet (GS) as a mass sensor is explored. A circular GS carrying a nanoparticle at an arbitrary position is modeled as a circular nanoplate with a concentrated micro-mass for clamped and simply supported boundary conditions. Based on the nonlocal Kirchhoff plate theory which incorporates size effects into the classical theory, the natural frequencies of the mass sensor are derived using the Galerkin method. The effects of mass and position of the nanoparticle on the frequencies and frequency shifts are discussed. The frequencies reduce to the results of the classical model for the absence of the small scale effect, which maintain in accordance with those available in literatures. Numerical results show that when the mass of the attached nanoparticle increases or its location is closer to the plate center, the natural frequency decreases, but frequency shift increases. Small scale effect diminishes the frequencies strongly, but has less effect on the frequency shifts. When the radius of the nanoplate decreases, the frequency shift increases. The results are helpful to design circular GS-based resonators as nanomechanical mass sensor.
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vibration of single layered Graphene Sheet based nanomechanical sensor via nonlocal kirchhoff plate theory
Computational Materials Science, 2012Co-Authors: Zhibin Shen, Haili Tang, Daokui Li, Guojin TangAbstract:Abstract The potential of single-layered Graphene Sheet (SLGS) as a nanomechanical sensor is explored. A simply supported SLGS carrying a nanoparticle at any position is modeled as a rectangular nanoplate with a concentrated micro-mass. Based on the nonlocal Kirchhoff theory of plates which incorporates size effects into the classical theory, the natural frequencies of a nanomechanical sensor are derived using the Galerkin method. The effects of the mass and position of the nanoparticle on the frequency shift are discussed. In the absence of the nonlocal parameter, the frequencies reduce to the results of the classical model, in agreement with those using the finite element method. The obtained results show that when the mass of the attached nanoparticle increases or its location is closer to the plate center, the natural frequency decreases, but frequency shift increases. Small scale effect diminishes the frequency shift. Decreasing the plate side length also increases the frequency shift. Obtained results are helpful to the design of SLGS-based resonator as nanomechanical mass sensor.
Ilhan A. Aksay - One of the best experts on this subject based on the ideXlab platform.
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Sandwich-type functionalized Graphene Sheet-sulfur nanocomposite for rechargeable lithium batteries
Physical Chemistry Chemical Physics, 2011Co-Authors: Yuliang Cao, John Lemmon, Zimin Nie, Zhenguo Yang, Ilhan A. Aksay, Xiaolin Li, Jun LiuAbstract:A functionalized Graphene Sheet-sulfur (FGSS) nanocomposite was synthesized as the cathode material for lithium-sulfur batteries. The structure has a layer of functionalized Graphene Sheets/stacks (FGS) and a layer of sulfur nanoparticles creating a three-dimensional sandwich-type architecture. This unique FGSS nanoscale layered composite has a high loading (70 wt%) of active material (S), a high tap density of ∼0.92 g cm(-3), and a reversible capacity of ∼505 mAh g(-1) (∼464 mAh cm(-3)) at a current density of 1680 mA g(-1) (1C). When coated with a thin layer of cation exchange Nafion film, the migration of dissolved polysulfide anions from the FGSS nanocomposite was effectively reduced, leading to a good cycling stability of 75% capacity retention over 100 cycles. This sandwich-structured composite conceptually provides a new strategy for designing electrodes in energy storage applications.
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functionalized Graphene Sheet colloids for enhanced fuel propellant combustion
ACS Nano, 2009Co-Authors: Justin L Sabourin, Richard A. Yetter, Daniel M. Dabbs, Frederick L. Dryer, Ilhan A. AksayAbstract:We have compared the combustion of the monopropellant nitromethane with that of nitromethane containing colloidal particles of functionalized Graphene Sheets or metal hydroxides. The linear steady-state burning rates of the monopropellant and colloidal suspensions were determined at room temperature, under a range of pressures (3.35−14.4 MPa) using argon as a pressurizing fluid. The ignition temperatures were lowered and burning rates increased for the colloidal suspensions compared to those of the liquid monopropellant alone, with the Graphene Sheet suspension having significantly greater burning rates (i.e., greater than 175%). The relative change in burning rate from neat nitromethane increased with increasing concentrations of fuel additives and decreased with increasing pressure until at high pressures no enhancement was found.
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functionalized Graphene Sheet colloids for enhanced fuel propellant
2009Co-Authors: Combustion L. Sabourin, Daniel M. Dabbs, Richard A. Yetter, Frederick L. Dryer, Ilhan A. AksayAbstract:We have compared the combustion of the monopropellant nitromethane with that of nitromethane containing colloidal particles of functionalized Graphene Sheets or metal hydroxides. The linear steady-state burning rates of the monopropellant and colloidal suspensions were determined at room temperature, under a range of pressures (3.3514.4 MPa) using argon as a pressurizing fluid. The ignition temperatures were lowered and burning rates increased for the colloidal suspensions compared to those of the liquid monopropellant alone, with the Graphene Sheet suspension having significantly greater burning rates (i.e., greater than 175%). The relative change in burning rate from neat nitromethane increased with increasing concentrations of fuel additives and decreased with increasing pressure until at high pressures no enhancement was found.
Q Wang - One of the best experts on this subject based on the ideXlab platform.
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a review on enhancement of mechanical and tribological properties of polymer composites reinforced by carbon nanotubes and Graphene Sheet molecular dynamics simulations
Composites Part B-engineering, 2019Co-Authors: Q Wang, Shijie WangAbstract:Abstract This paper reviews the application of molecular dynamics simulations on mechanical and tribological properties of polymer composites reinforced by carbon nanotubes and Graphene Sheet as reinforcements. A variety of simulation studies on modelling, calculation and analysis on enhanced elastic, tensile, fracture properties of carbon nanotubes and Graphene Sheet/polymer composites are introduced and reviewed. The capabilities of molecular dynamics simulations on exploring inherent mechanisms on improved tribological properties of carbon nanotubes and Graphene Sheet/polymer composites from atomic views are particularly discussed. Different methods of surface modifications of the two nano reinforcements on further enhancing the strength of polymer composites are summarized. Summary and recommendations for potential researches are also provided. This review is intended to provide a state-of-the-art and better understanding on applications of carbon nanotubes and Graphene Sheet for enhancing mechanical and tribological properties of polymer composites by molecular dynamics simulations, and inspire future efforts in this area.
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a comparison study on mechanical properties of polymer composites reinforced by carbon nanotubes and Graphene Sheet
Composites Part B-engineering, 2018Co-Authors: Shijie Wang, Q Wang, Malcolm XingAbstract:Abstract To compare enhancements of mechanical properties of polymer composites reinforced by carbon nanotubes and Graphene Sheet, molecular models of polymer matrix reinforced by the same weight percentage of carbon nanotubes and Graphene Sheet are developed. Pull-out process and strain constant method are applied to find mechanical properties of the nano-composites by examining the interfacial interactions between nano-reinforcements and polymer matrices. The results show that about 18% higher in Young's modulus, 8.7% higher in tensile strength, and 5% higher in surface crack energy are obtained for the composites by incorporation of Graphene Sheet than those by incorporation of carbon nanotubes. Graphene Sheet is found to play a better role in delaying the propagations of cracks. To explore the mechanisms on the enhanced tensile and fracture properties, the interfacial interaction energy and shear forces between the nano-reinforcements and polymer matrices, and total van der Waals energy of the polymer composites are examined and interpreted accordingly.
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controlling the formation of wrinkles in a single layer Graphene Sheet subjected to in plane shear
Carbon, 2011Co-Authors: Wenhui Duan, Kai Gong, Q WangAbstract:The initiation and development of wrinkles in a single layer Graphene Sheet subjected to in-plane shear displacements are investigated. The dependence of the wavelength and amplitude of wrinkles on the applied shear displacements is explicitly obtained with molecular mechanics simulations. A continuum model is developed for the characteristics of the wrinkles which show that the wrinkle wavelength decreases with an increase in shear loading, while the amplitude of the wrinkles is found to initially increase and then become stable. The propagation and growth process of the wrinkles in the Sheet is elucidated. It is expected that the research could promote applications of Graphenes in the transportation of biological systems, separation science, and the development of the fluidic electronics.
Guojin Tang - One of the best experts on this subject based on the ideXlab platform.
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vibration analysis of a single layered Graphene Sheet based mass sensor using the galerkin strip distributed transfer function method
Acta Mechanica, 2016Co-Authors: Renwei Jiang, Zhibin Shen, Guojin TangAbstract:The free vibration of a single-layered Graphene Sheet (SLGS)-based mass sensor is analyzed using the Galerkin strip distributed transfer function method (GSDTFM) based on the nonlocal Kirchhoff plate theory. The dynamic equations of the SLGS-based mass sensor are formulated, and the semi-analytical solutions of the frequency shift are computed with the GSDTFM. The effects of the nonlocal parameter, the attached nanoparticle locations, the plate side length, as well as the boundary conditions, on the frequency shift are studied. The simulated results show that the frequency shift of the SLGS-based mass sensor becomes smaller when the nonlocal parameter increases. The SLGS-based mass sensor is more sensitive when the attached nanoparticle is closer to the SLGS center or the side length of the SLGS becomes smaller. The boundary conditions strongly affect the frequency shift. Stiffer boundary condition causes larger frequency shift.
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vibration of single layered Graphene Sheet based nanomechanical sensor via nonlocal kirchhoff plate theory
Computational Materials Science, 2012Co-Authors: Zhibin Shen, Haili Tang, Daokui Li, Guojin TangAbstract:Abstract The potential of single-layered Graphene Sheet (SLGS) as a nanomechanical sensor is explored. A simply supported SLGS carrying a nanoparticle at any position is modeled as a rectangular nanoplate with a concentrated micro-mass. Based on the nonlocal Kirchhoff theory of plates which incorporates size effects into the classical theory, the natural frequencies of a nanomechanical sensor are derived using the Galerkin method. The effects of the mass and position of the nanoparticle on the frequency shift are discussed. In the absence of the nonlocal parameter, the frequencies reduce to the results of the classical model, in agreement with those using the finite element method. The obtained results show that when the mass of the attached nanoparticle increases or its location is closer to the plate center, the natural frequency decreases, but frequency shift increases. Small scale effect diminishes the frequency shift. Decreasing the plate side length also increases the frequency shift. Obtained results are helpful to the design of SLGS-based resonator as nanomechanical mass sensor.
Moslem Mohammadi - One of the best experts on this subject based on the ideXlab platform.
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numerical study of the effect of shear in plane load on the vibration analysis of Graphene Sheet embedded in an elastic medium
Computational Materials Science, 2014Co-Authors: Moslem Mohammadi, M Goodarzi, Ali Farajpour, Shehni Nezhad H PourAbstract:Abstract In the present work, the free vibration behavior of rectangular Graphene Sheet under shear in-plane load is studied. Nonlocal elasticity theory has been implemented to study the vibration analysis of orthotropic single-layered Graphene Sheets (SLGSs) subjected to shear in-plane load. Using the principle of virtual work, the governing equations are derived for the rectangular nanoplates. Differential quadrature method is employed and numerical solutions for the vibration frequency are obtained. To verify the accuracy of the present results, the Galerkin method is also developed. DQM results are successfully verified with those of the Galerkin method. The influence of surrounding elastic medium and effect of boundary conditions on the vibration analysis of orthotropic single-layered Graphene Sheets (SLGSs) is studied. Six boundary conditions are investigated. Numerical results show that the vibration frequencies of SLGSs are strongly dependent on the small scale coefficient and shear in-plane load.
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INFLUENCE OF IN-PLANE PRE-LOAD ON THE VIBRATION FREQUENCY OF CIRCULAR Graphene Sheet VIA NONLOCAL CONTINUUM THEORY
Composites Part B: Engineering, 2013Co-Authors: Moslem Mohammadi, M Goodarzi, Mostafa Ghayour, Ali FarajpourAbstract:Abstract In this study, the free vibration behavior of circular Graphene Sheet under in-plane pre-load is studied. By using the nonlocal elasticity theory and Kirchhoff plate theory, the governing equation is derived for single-layered Graphene Sheets (SLGSs). The closed-form solution for frequency vibration of circular Graphene Sheets under in-plane pre-load has been obtained and nonlocal parameter appears into arguments of Bessel functions. The results are subsequently compared with valid result reported in the literature. The effects of the small scale, pre-load, mode number and boundary conditions on natural frequencies are investigated. The results are shown that at smaller radius of circular nanoplate, the effect of in-plane pre-loads is more importance.
