Hi, Can anyone tell me Percolation Threshold of Graphene (obtained by Probe Sonication of the Graphene NanoPlatelets) into PVDF Polymer solution. I am eagerly looking forward to know the relevant datas and Info. your answers will be highly appreciated.
Dear Teekaram,
Perhaps you can start with this recent article:
http://arxiv.org/abs/1204.2961
http://journals.aps.org/pre/abstract/10.1103/PhysRevE.85.061407
Connectivity percolation in suspensions of hard platelets
Maneesh Mathew, Tanja Schilling, Martin Oettel
(Submitted on 13 Apr 2012)
We present a study on connectivity percolation in suspensions of hard platelets by means of Monte Carlo simulation. We interpret our results using a contact-volume argument based on an effective single--particle cell model. It is commonly assumed that the percolation threshold of anisotropic objects scales as their inverse aspect ratio. While this rule has been shown to hold for rod-like particles, we find that for hard plate-like particles the percolation threshold is non-monotonic in the aspect ratio. It exhibits a shallow minimum at intermediate aspect ratios and then saturates to a constant value. This effect is caused by the isotropic-nematic transition pre-empting the percolation transition. Hence the common strategy to use highly anisotropic, conductive particles as fillers in composite materials in order to produce conduction at low filler concentration is expected to fail for plate-like fillers such as graphene and graphite nanoplatelets.
Subjects: Soft Condensed Matter (cond-mat.soft); Statistical Mechanics (cond-mat.stat-mech)
DOI: 10.1103/PhysRevE.85.061407
Cite as: arXiv:1204.2961 [cond-mat.soft]
(or arXiv:1204.2961v1 [cond-mat.soft] for this version)
Best regards,
Mike Bender
Dear Mr. Madhukar,
at my opinion the percolation limit for polypropylene and graphite is about 15 % of graphite in the poylmere. This is important for EMC shielding effect. Under this limit we have NOT GOOD shielding effect.
Sincerely yours
F. Gräbner
"percolation" is not the correct term as percolation theory is based on the assumption that the dispersed particles (which you are looking at) are statistically evenly distributed in the matrix.
However, as soon as your particles are less than 1 micron in diameter, they are not any more statsticaly evenly distributed, but form very complex structures which finally are responsible for a sudden breakthrough of conductivity at a certain critical concentration, see this article:
https://www.researchgate.net/publication/229816762_Electrical_conductivity_in_heterogeneous_polymer_systems_V_1_Further_experimental_evidence_for_a_phase_transition_at_the_critical_volume_concentration?ev=prf_pub
and my various reviews on my RG page which contain additional evidence for it.
Most impotant to note: the critical concentration is dependant upon the dispersion degree.
Article Electrical conductivity in heterogeneous polymer systems. V ...
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