Modelling percolation in fibre and sphere mixtures: Routes to more efficient network formation

Rahatekar, Sameer S.; Shaffer, Milo S. P.; Elliott, James A.

doi:10.1016/j.compscitech.2009.11.007

Cited by 49 publications

(50 citation statements)

References 50 publications

(57 reference statements)

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“…This finding is in accordance with Rahatekar et al [39], who modelled the percolation in mixtures of fibers and spheres using a Dissipative Particle Dynamics (DPD) method. For both isotropic and uniaxially oriented fibre -sphere mixtures, they found that gradually replacing fibres with an equivalent volume of spheres increased the percolation threshold.…”

Section: Effect Of Hybrid Filler Systems On Electrical Percolationsupporting

confidence: 80%

Electrical and thermal properties of polyamide 12 composites with hybrid fillers systems of multiwalled carbon nanotubes and carbon black

Socher

Krause

Hermasch

et al. 2011

Composites Science and Technology

159

111

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thermal properties of polyamide 12 composites with hybrid fillers systems of multiwalled carbon nanotubes and carbon black. Composites Science and Technology, Elsevier, 2011, 71 (8) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractHybrid filler systems of multiwalled carbon nanotubes (MWCNTs) and carbon black (CB) were incorporated into two types of polyamide 12 (PA12) using small-scale melt mixing in order to identify potential synergistic effects on the interaction of these two electrical conductive fillers. Although no synergistic effects were observed regarding the electrical percolation threshold, at loadings well above the percolation threshold higher volume conductivities were obtained for samples containing both, MWCNT and CB, as compared to single fillers. This effect was more pronounced when using a higher viscous PA12 matrix. The formation of a co-supporting network can be assumed. The combined use of CB and MWCNTs improved the macrodispersion of MWCNT agglomerates, which can be assigned as a synergistic effect. DSC measurements indicated an effect of the nanofiller on crystallisation temperatures of PA12; however this was independent of the kind or amount of the carbon nanofiller.

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Section: Effect Of Hybrid Filler Systems On Electrical Percolationsupporting

confidence: 80%

Electrical and thermal properties of polyamide 12 composites with hybrid fillers systems of multiwalled carbon nanotubes and carbon black

Socher

Krause

Hermasch

et al. 2011

Composites Science and Technology

159

111

View full text Add to dashboard Cite

show abstract

“…The conductivity values, which are shown by the red symbols, follow the same trend as the storage modulus. The above correlation seems to support the hypothesis that a composite morphology consists of phase separated regions of clusters and dangling bridges result in more effective electron transport than an evenly-spread CNT network [63][64][65]. A recent study by Kyrylyuk et al [66] provided theoretical reasoning to this counter-intuitive effect, and showed that a multi-component CNT dispersion can achieve better electrical percolation than a single phase one.…”

Section: Correlating the Physical Properties And The Microstructuresupporting

confidence: 51%

Dispersion of Carbon Nanotubes: Mixing, Sonication, Stabilization, and Composite Properties

2012

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Advances in functionality and reliability of carbon nanotube (CNT) composite materials require careful formulation of processing methods to ultimately realize the desired properties. To date, controlled dispersion of CNTs in a solution or a composite matrix remains a challenge, due to the strong van der Waals binding energies associated with the CNT aggregates. There is also insufficiently defined correlation between the microstructure and the physical properties of the composite. Here, we offer a review of the dispersion processes of pristine (non-covalently functionalized) CNTs in a solvent or a polymer solution. We summarize and adapt relevant theoretical analysis to guide the dispersion design and selection, from the processes of mixing/sonication, to the application of surfactants for stabilization, to the final testing of composite properties. The same approaches are expected to be also applicable to the fabrication of other composite materials involving homogeneously dispersed nanoparticles.

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“…This is because the overall resistance of the fiber will be dominated by a limited number of paths of least resistance, 32 whereas the characteristic resistance measures the changes in ac behavior of all of the junctions in the fiber, whether or not they contribute significantly to the overall dc conduction pathway. More extensive studies of the characteristic resistance and capacitance of the fiber network are under way and will be reported in a subsequent publication.…”

mentioning

confidence: 99%

Electric Field-Modulated Non-ohmic Behavior of Carbon Nanotube Fibers in Polar Liquids

et al. 2014

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We report a previously unseen non-ohmic effect in which the resistivity of carbon nanotube fibers immersed in polar liquids is modulated by the applied electric field. This behavior depends on the surface energy, dielectric constant, and viscosity of the immersion media. Supported by synchrotron SAXS and impedance spectroscopy, we propose a model in which the gap distance, and thus the conductance, of capacitive interbundle junctions is controlled by the applied field.

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Modelling percolation in fibre and sphere mixtures: Routes to more efficient network formation

Cited by 49 publications

References 50 publications

Electrical and thermal properties of polyamide 12 composites with hybrid fillers systems of multiwalled carbon nanotubes and carbon black

Electrical and thermal properties of polyamide 12 composites with hybrid fillers systems of multiwalled carbon nanotubes and carbon black

Dispersion of Carbon Nanotubes: Mixing, Sonication, Stabilization, and Composite Properties

Electric Field-Modulated Non-ohmic Behavior of Carbon Nanotube Fibers in Polar Liquids

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