Topic
Volume fraction
About: Volume fraction is a research topic. Over the lifetime, 16312 publications have been published within this topic receiving 374181 citations.
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TL;DR: In this article, the percolation threshold of the films was only 0.122, which was lower than the theoretical value (0.16) and the effective dielectric permittivity of the film with 12.5vol% of Ag fillers achieved 400 at 103Hz.
Abstract: Silver/polyimide composite films were prepared through simple ultrasonic dispersion and subsequent in situ polymerization process. Dependence of dielectric properties of the films on volume fraction of Ag particles, frequency, and temperature was investigated. The percolation threshold of the films was only 0.122, which was lower than the theoretical value (0.16). The effective dielectric permittivity of the film with 12.5vol% of Ag fillers achieved 400 at 103Hz. The relative tolerance of dielectric permittivity of the film with 12.0vol% of Ag fillers in wide temperature range was less than 4.0%, which would satisfy the need in practical applications.
94 citations
TL;DR: In this paper, the effects of different key parameters such as Richardson number, position and height of the block, the volume fraction of the nanoparticles, and cavity inclination angles on the fluid flow and heat transfer inside the cavity are investigated.
94 citations
TL;DR: In this paper, thermal conductivity and viscosity of surfactant free and stable ethylene glycol (EG) based ZnO-nanofluids, prepared using long duration sonication, have been investigated.
94 citations
TL;DR: In this article, high volume fraction hemp and flax fibre composites were manufactured using low viscosity epoxy and phenolic resins, and composites with a mean stiffness of 26 GPa and a mean strength of 378 MPa were produced.
Abstract: High volume fraction hemp and flax fibre composites were manufactured using low viscosity epoxy and phenolic resins. Using 80% volume fraction of flax fibres in epoxy resin, composites with a mean stiffness of 26 GPa and a mean strength of 378 MPa were produced. By reducing processing damage of the plant fibres mechanical properties could be increased by 40%. Strips of retted fibre tissue were found to be just as effective for reinforcement as fibre bundles and individual fibres. Phenolic resin and decorticated flax fibres produced very poor composites. Using 40% volume fraction of fibres the mean stiffness was 3.7 GPa and the mean strength was 27 MPa. Two fibre pre-treatments were devised to improve adhesion with resins. The first, 6 M urea was used only in natural fibre-epoxy composites where it increased the stiffness but not the strength. The second pre-treatment was a 50% PVA solution, which was cured prior to the addition of space filling resin. The PVA treatment improved the stiffness and strength of both natural fibre-epoxy composites and natural fibre-phenolic composites.
94 citations
TL;DR: It was shown that in the case of small volume fraction of cells in suspension, the electrode polarization effect can be taken into account by the additional measurement of the corresponding supernatant.
94 citations