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Continuum percolation of polydisperse rods in quadrupole fields : theory and simulations.

Finner, Shari P. and Kotsev, Mihail I. and Miller, Mark A. and van der Schoot, Paul (2018) 'Continuum percolation of polydisperse rods in quadrupole fields : theory and simulations.', Journal of chemical physics., 148 (3). 034903.


We investigate percolation in mixtures of nanorods in the presence of external fields that align or disalign the particles with the field axis. Such conditions are found in the formulation and processing of nanocomposites, where the field may be electric, magnetic, or due to elongational flow. Our focus is on the effect of length polydispersity, which—in the absence of a field—is known to produce a percolation threshold that scales with the inverse weight average of the particle length. Using a model of non-interacting spherocylinders in conjunction with connectedness percolation theory, we show that a quadrupolar field always increases the percolation threshold and that the universal scaling with the inverse weight average no longer holds if the field couples to the particle length. Instead, the percolation threshold becomes a function of higher moments of the length distribution, where the order of the relevant moments crucially depends on the strength and type of field applied. The theoretical predictions compare well with the results of our Monte Carlo simulations, which eliminate finite size effects by exploiting the fact that the universal scaling of the wrapping probability function holds even in anisotropic systems. Theory and simulation demonstrate that the percolation threshold of a polydisperse mixture can be lower than that of the individual components, confirming recent work based on a mapping onto a Bethe lattice as well as earlier computer simulations involving dipole fields. Our work shows how the formulation of nanocomposites may be used to compensate for the adverse effects of aligning fields that are inevitable under practical manufacturing conditions.

Item Type:Article
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Publisher statement:© 2018 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Finner, Shari P., Kotsev, Mihail I., Miller, Mark A. & van der Schoot, Paul (2018). Continuum percolation of polydisperse rods in quadrupole fields: Theory and simulations. The Journal of Chemical Physics 148(3): 034903 and may be found at
Date accepted:27 December 2017
Date deposited:10 January 2018
Date of first online publication:18 January 2018
Date first made open access:10 January 2018

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