Percolation Threshold of Carbon Black-Polyethylene Composites

Nakamura, Shuhei; Saito, Kazuhiko; Sawa, Goro; Kitagawa, Keiichi

doi:10.1143/jjap.36.5163

Cited by 87 publications

(50 citation statements)

References 11 publications

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“…Below Pt, the AC conductivity of carbon blackfilled polyethylene matrix composites becomes AC loss current in proportion to frequency. [7] Near Pt, apart from the loss current in proportion to the frequency, frequency does not have any impact. Also, different current elements depending on electric fields are repeated.…”

Section: Resultsmentioning

confidence: 92%

“…[6] This is identical to the result of Nakamura. [7] Nakamura mentioned the need to review the change behavior of relative dielectric constant in relation to the amount of filled black carbon in association with effective medium approximation theory (EMA theory) as the size of carbon black clusters tends to remain limited when the amount is below Pt. [6,8] investigate the effect of temperature on the dielectric properties of carbon black-filled polyethylene matrix composites below the Pt based on the EMA theory.…”

Section: Introductionmentioning

confidence: 99%

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RETRACTED ARTICLE: Effect of temperature on the dielectric properties of carbon black-filled polyethylene matrix composites below the percolation threshold

Shin

Kwon

2011

Electron. Mater. Lett.

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The temperature dependence of dielectric properties of carbon black-filled polyethylene matrix composites below the percolation threshold was studied based on the effect medium approximation theory (EMA theory). Although the literature on calculation based on the EMA theory by changing the parameters is vast, an overall discussion taking into account the EMA theory is required to explain the dielectric properties of the composites and their temperature dependence. Changes of the dielectric properties of carbon black-filled PMC and their temperature dependence below the percolation threshold for the volume fraction of carbon black have been discussed based on the EMA theory. The composites satisfy the universal law of conductivity above the percolation threshold, whereas it gives the critical exponent of s = 1 for dielectric constant below percolation threshold. The rates of the decrement of both % changes of dielectric constant and dielectric loss factor for temperature become larger with an increase in the volume fraction below percolation threshold. By incorporating the effect of thermal expansion into the EMA theory, the temperature dependence of dielectric properties is successfully explained.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Effect of temperature on the dielectric properties of carbon black-filled polyethylene matrix composites below the percolation threshold

Shin

Kwon

2011

Electron. Mater. Lett.

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“…The volume filler fraction of SiN10 is 3 % (assuming a filler density of 3.44 g/cm 3 and a polymer density of 0.95 g/cm 3 ), which is well below the threshold for percolation for conducting spheres in a non-conducting matrix [28]. However, numerical modelling calculations by other authors [15] have shown that it is possible to obtain a percolating network in such a system by introducing water shells of ~60 nm thickness around each nanoparticle.…”

Section: F Simulation Of Percolationmentioning

confidence: 98%

“…In the silica nanocomposites, a percolating network is not formed, due most likely, to particle aggregation (see Fig. 3); aggregation allows water shells locally to overlap so reducing the overall volume fraction of the system occupied by water-containing interphase regions to below that required for percolation [15,28].…”

Section: F Simulation Of Percolationmentioning

confidence: 99%

The Effects of Water on the Dielectric Properties of Silicon-Based Nanocomposites

Hosier¹,

Praeger²,

Vaughan

et al. 2017

IEEE Trans. Nanotechnology

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Abstract-A series of polyethylene-based nanocomposites was prepared, utilizing silicon nitride or silicon dioxide (silica) nanopowders, and the effect of filler loading and conditioning (i.e. water content) on their morphology and electrical properties was examined. The addition of nano-silicon nitride led to systems that were free of obvious nanoparticle aggregates, whereas the nanosilica based systems showed evidence of aggregation up to the micrometer-scale. While the nano-silicon nitride composites remained essentially dry under ambient conditions, the nanosilica-based composites absorbed appreciable quantities of water from the ambient environment, indicating that interactions with water are dependent on the nanoparticle surface chemistry. Dielectric spectroscopy showed a broad relaxation peak due to adsorbed water at nanoparticle surfaces, which shifted to higher frequencies with increased water content. Similarly, the electrical conductivity was found to be highly sensitive to the presence of absorbed water, particularly for systems containing well dispersed nanoparticles. We conclude that, in nanodielectric applications, nanoparticle surface chemistry is important in determining macroscopic properties, and not just as a means of compatibilizing the filler and the matrix. Additional factors can be critical, here, as exemplified by interactions with water.

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“…From the experimental and theoretical investigations, it is reported that the drastic variation of conductivity and permittivity takes place around the φ c . 13,14 Since we used the same Permalloy particles in the preparation of heat-treated and non-treated particle composites, the critical particle content of the mechanical percolation must be the same in the two particle conditions. Therefore, it is considered that the critical particle content φ c in the electrical percolation was increased by the decrease of the electrical conductivity due to the heat-treatment of particles.…”

Section: Resultsmentioning

confidence: 99%