Article (Scientific journals)
Depletion-interaction effects on the tunneling conductivity of nanorod suspensions
Nigro, B.; Grimaldi, C.; Miller, M.A et al.
2013In Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, 88 (042140)
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Abstract :
[en] We study by simulation and theory how the addition of insulating spherical particles affects the conductivity of fluids of conducting rods, modeled by spherocylinders. The electrical connections are implemented as tunneling processes, leading to a more detailed and realistic description than a discontinuous percolation approach. We find that the spheres enhance the tunneling conductivity for a given concentration of rods and that the enhancement increases with rod concentration into the regime where the conducting network is well established. By reformulating the network of rods using a critical path analysis, we quantify the effect of depletion-induced attraction between the rods due to the spheres. Furthermore, we show that our conductivity data are quantitatively reproduced by an effective-medium approximation, which explicitly relates the system tunneling conductance to the structure of the rod-sphere fluid.
Disciplines :
Physics
Author, co-author :
Nigro, B.;  Ecole Polytechnique Fédérale de Lausanne - EPFL > LPM
Grimaldi, C.;  Ecole Polytechnique Fédérale de Lausanne - EPFL > Laboratory of Physics of Complex Matter
Miller, M.A;  Durham University > Department of Chemistry
Ryser, P.;  Ecole Polytechnique Fédérale de Lausanne - EPFL > LPM
Schilling, Tanja ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Language :
English
Title :
Depletion-interaction effects on the tunneling conductivity of nanorod suspensions
Publication date :
2013
Journal title :
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
ISSN :
1550-2376
Publisher :
American Physical Society, College Park, United States - Maryland
Volume :
88
Issue :
042140
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 28 October 2013

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