And we hope you, and your loved ones, are staying safe and healthy. All rights reserved. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Percolation and conductivity development of the rod networks within randomly packed porous media. © 2020 Elsevier Ltd. All rights reserved. A percolation-permeation-diffusion simulation and analysis scheme was proposed with Cellular Automata (CA) and Lattice Boltzmann method (LBM). By continuing you agree to the use of cookies. Information about registration may be found here. The percolation threshold is reached when the insulator - conductor transition is observed. Lett. https://doi.org/10.1103/PhysRevLett.27.1719, Physical Review Physics Education Research, Log in with individual APS Journal Account », Log in with a username/password provided by your institution », Get access through a U.S. public or high school library ». COVID-19 has impacted many institutions and organizations around the world, disrupting the progress of research. Shortened rod length triggers the influence of the local pores on the conductivity. According to the percolation theory, the relationship between the conductivity and the volume fraction of the composite filler is given by [45] (5.65) σ = σ 0 ( V f − V c ) … The physical system was modelled as the rod-particle composite with an adjustable packing density of the porous medium, and experiment on the electrical resistivity development was conducted on the CNT-cement composite. Subscription The simulation-based study demonstrates that the densely packed porous medium can further enhance the connectivity and conductivity of the network within, especially with the shortened rod length. Representative elementary volume analysis was performed to determine the suitable size of the digital sample. It was found that heterogeneity caused locally enhanced transportability. Generally, it is better to use as less filler as possible for getting the conductive regime. The proposed simulation-analysis scheme is a generic method to evaluate the conductive network formed in porous media. Physical Review Letters™ is a trademark of the American Physical Society, registered in the United States, Canada, European Union, and Japan. Download : Download high-res image (636KB)Download : Download full-size image. Hydration product covering CNT magnify the elementary resistivity to tens times. The percolation threshold for the GA/epoxy composites was found to be ~0.25 wt.%, with the highest conductivity of 20 S m −1 obtained at 1.4 wt.% graphene content, which is 4 orders of magnitude higher than that found for 2.0 wt.% GNP , and nearly 2 orders of magnitude higher than those containing 3 wt.% CRGO or 1 wt.% CNTs . Conditions and any applicable https://en.wikipedia.org/wiki/Conductivity_near_the_percolation_threshold The behavior of the conductivity is found to be quite different from that of the percolation probability. We appreciate your continued effort and commitment to helping advance science, and allowing us to publish the best physics journals in the world. Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and The. Learn More ». Heterogeneous porous sericulture locally increased the permeability of the network. 27, 1719 – Published 20 December 1971 We use cookies to help provide and enhance our service and tailor content and ads. Percolation is a standard model for disordered systems. A compatible percolation-permeation-diffusion simulation scheme is proposed. https://doi.org/10.1016/j.compositesb.2020.107837. The APS Physics logo and Physics logo are trademarks of the American Physical Society. Last and D. J. Thouless Phys. ISSN 1079-7114 (online), 0031-9007 (print). Copyright © 2020 Elsevier B.V. or its licensors or contributors. To address this, we have been improving access via several different mechanisms. However, it is open to question that the content range up to the percolation threshold [ 31 ] is sufficient to cover the entire content range of the mass/electron transport. A general trend that increased network content increased the electrical conductivity was observed both numerically and experimentally. The hydration product covering the CNT surface can introduce surface resistance to increase the elementary resistivity of the network to a magnification of tens times. Densely packed porous medium enhances the conductivity of the network within. See Off-Campus Access to Physical Review for further instructions. Percolation behaviour can explain the conductivity development of a network to some extent. Its applications range from transportinamorphousandporousmediaandcompositesto thepropertiesofbranched polymers, gels and complex ionic conductors.

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