Effect of Iron Particle Size and Concentration on Thermal Conductivity of Iron/Polystyrene Composites

Elimat, Z. M.; AL-Aqrabawi, F. S.; Hazeem, T. Abu; Ramadin, Y.; Zihlif, A. M.

doi:10.1007/s10765-013-1499-7

Cited by 11 publications

(5 citation statements)

References 21 publications

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“…8), the experimental values of k showed in Fig. 9a do not display a saturation, as was reported by Elimat et al [46], but rather it tends to increase exponentially after crossing the percolation threshold, which is consistent with the data reported by Sofian et al [40] and Rusu et al [41]. For a concentration of 0.12 vf, the thermal conductivity increases 1.9 times that of the matrix.…”

Section: Thermal Conductivitysupporting

confidence: 90%

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

et al. 2021

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Composites made up of microparticles embedded in a polymeric matrix have attracted increasing attention due to the possibility of tailoring their physical properties by adding the adequate quantity of fillers. As the concentration of these fillers increases, their connectivity changes drastically at a given threshold and therefore the electrical, thermal and optical properties of these composites are expected to exhibit a percolation effect. In this work, the thermal and electrical conductivities along with the emissivity of composites composed of carbonyl-iron microparticles randomly distributed in a polyester resin matrix are measured, for volume fractions ranging from 0 to 0.55. It is shown that both the thermal and electrical conductivities increase with the particles' concentration, such that their percolation threshold appears at volume fractions of 0.46 and 0.38, respectively. The emissivity, on the other hand, decreases as the fillers' concentration increases, such that it exhibits a substantial decay at a volume fraction of 0.41. The percolation threshold of the emissivity is thus higher than that of the thermal conductivity, but lower than the electrical conductivity one. This dispersion on the percolation concentration is justified by the different physical mechanisms required to activate the electrical, thermal, and optical responses of the considered composites. The obtained results thus show that the percolation phenomenon can efficiently be used to enhance or reduce the physical properties of particulate composites.

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Section: Thermal Conductivitysupporting

confidence: 90%

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

et al. 2021

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“…Taşdemir and Gulsoy 15 reported that the physical properties are affected by adding the iron particles to the PS matrix. Recently, Elimat et al 16 studied the effect of iron particle sizes on the thermal conductivity of PS composites and found large enhancement in the thermal conduction.…”

Section: Introductionmentioning

confidence: 99%

Optical and electrical properties of polystyrene composites containing ultrafine iron particles

Saleh

Ramadin

Zihlif

et al. 2014

Journal of Thermoplastic Composite Materials

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Optical and electrical properties of conductive polymer composites made of polystyrene (PS) containing ultrafine iron particles of size 2 mm were studied under different measuring conditions: iron filler concentrations (0, 5, 10, 20, and 30 wt.%), ultraviolet radiation wavelength, temperature range (30-90 C), and applied frequency range (50 kHz-1.5 MHz). The absorption spectra from the composites were measured using a spectrophotometer. The analysis of the optical results showed that the electronic transitions are direct in the k-space. The optical energy gap and the energy tails were determined as a function of iron particles' content. It was found that optical energy gap decreased and energy tails increased with iron content. The determined refractive index (n) and the extinction coefficient (k) increased with iron concentration. The alternating current (AC) conductivity and dielectric properties were determined using impedance measurements. The collected impedance data were analyzed and showed that the dielectric constant (" 0 ) and dielectric loss (" 00 ) of the composites are increasing as iron concentration increases and decreasing as the applied frequency increases. It was found that the AC conductivity increases with increasing frequency, temperature, and iron concentration. Some theoretical and empirical models are used to describe the observed optical and electrical behavior of the prepared PS composites.

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“…The contact between the iron particles and the disc surface induced plastic deformation, and strain hardening at this contact plateau generated iron and iron oxide wear debris, and contributed to friction due to adhesion [23]. The iron particles also had an effect on the increasing thermal conductivity of the polymer composite [24]. In reference to the previous explanation, the contact plateau that was formed by the iron particles affected the frictional behaviour of the composite brake block.…”

Section: Methodsmentioning

confidence: 79%

Characteristic Evaluation of Brake Block Material

Surojo¹,

Jamasri²,

Malau³

et al. 2017

Tribol. Ind.

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Effect of Iron Particle Size and Concentration on Thermal Conductivity of Iron/Polystyrene Composites

Cited by 11 publications

References 21 publications

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

Percolation Threshold of the Thermal, Electrical and Optical Properties of Carbonyl-Iron Microcomposites

Optical and electrical properties of polystyrene composites containing ultrafine iron particles

Characteristic Evaluation of Brake Block Material

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