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    Estimating and understanding the efficiency of nanoparticles in enhancing the conductivity of carbon nanotube/polymer composites

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    Type
    Article
    Authors
    Mora Cordova, Angel cc
    Han, Fei cc
    Lubineau, Gilles cc
    KAUST Department
    Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-05-22
    Online Publication Date
    2018-05-22
    Print Publication Date
    2018-09
    Permanent link to this record
    http://hdl.handle.net/10754/627972
    
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    Abstract
    Carbon nanotubes (CNTs) have been widely used to improve the electrical conductivity of polymers. However, not all CNTs actively participate in the conduction of electricity since they have to be close to each other to form a conductive network. The amount of active CNTs is rarely discussed as it is not captured by percolation theory. However, this amount is a very important information that could be used in a definition of loading efficiency for CNTs (and, in general, for any nanofiller). Thus, we develop a computational tool to quantify the amount of CNTs that actively participates in the conductive network. We then use this quantity to propose a definition of loading efficiency. We compare our results with an expression presented in the literature for the fraction of percolated CNTs (although not presented as a definition of efficiency). We found that this expression underestimates the fraction of percolated CNTs. We thus propose an improved estimation. We also study how efficiency changes with CNT loading and the CNT aspect ratio. We use this concept to study the size of the representative volume element (RVE) for polymers loaded with CNTs, which has received little attention in the past. Here, we find the size of RVE based on both loading efficiency and electrical conductivity such that the scales of “morphological” and “functional” RVEs can be compared. Additionally, we study the relations between particle and network properties (such as efficiency, CNT conductivity and junction resistance) and the conductivity of CNT/polymer composites. We present a series of recommendations to improve the conductivity of a composite based on our simulation results.
    Citation
    Mora A, Han F, Lubineau G (2018) Estimating and understanding the efficiency of nanoparticles in enhancing the conductivity of carbon nanotube/polymer composites. Results in Physics 10: 81–90. Available: http://dx.doi.org/10.1016/j.rinp.2018.05.019.
    Sponsors
    The research reported in this publication was funded by King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Results in Physics
    DOI
    10.1016/j.rinp.2018.05.019
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S2211379718309306
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.rinp.2018.05.019
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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