SiO2 coated Fe3O4 submicrometer spherical particles (a conducting core/insulating shell configuration) are fabricated using a hydrothermal method and are loaded at 10 and 20 vol % into a bisphenol E cyanate ester matrix for synthesis of multifunctional composites. The dielectric constant of the resulting composites is found to be enhanced over a wide frequency and temperature range while the lo...

The current special issue topic ‘‘modeling and simulation in composite materials’’ is intended to capture the recent advancements in the area of modeling and simulation in composite materials. The articles that appear under this topic describe theoretical models, molecular mechanics methods, finite-element methods, and multiscale methods for mechanical and thermal properties of composite materi...

Carbon nanotube is a kind of the special structure of material. Its radial length is nano-level and axial length is micron order of magnitude. Both ends of this one-dimensional quantum tube are basically sealed. Several dozens of layers of coaxial pipe is made up of the hexagonal arrangement of carbon atoms. In this paper, the Organic polymer Composite Materials Modified by Carbon Nanotube is i...

One main feature of metamaterials is the occurrence of a negative dynamic mass density that is produced when an inner local resonance is present. The inner resonance can be obtained in composite materials containing composite inclusions. For suitable ratios of the physical properties of the constituting materials, the composite inclusions act as spring-mass systems. The scaling of physical prop...

We have measured the low-temperature transport properties of a high-mobility front-gated GaAs/Al 0.33 Ga 0.67 As heterostructure. By changing the applied gate voltage, we can vary the amount of disorder within the system. At a Landau level filling factor ν = 1/2, where the system can be described by the composite fermion picture, we observe a crossover from metallic to insulating behaviour as t...

Synthesis, structure, properties, main reactions, and applications of graphenes are reviewed. It is shown that these compounds possess unique properties, which can be successfully used for a series of applications, mainly as nanodevices and composite materials.

Leonardo Gonçalves Cunha1 Roberta Caroline Bruschi Alonso1 Mario Alexandre Coelho Sinhoreti2 Mario Fernando de Goes3 Lourenço Correr Sobrinho3 1 Graduate Students – Department of Restorative Dentistry – Piracicaba Dental School – SP – Brazil 2 DDS, MS, Associate Professor Department of Restorative Dentistry – Piracicaba Dental School – SP – Brazil 3 DDS, MS, PhD Associate Professors Department ...

This in vitro study determined the surface roughness (Ra) and absolute gloss (AG) values for 2 resin composites: a microhybrid and a microfill. Eight groups (n = 4) of each resin composite were prepared, along with 4 controls (Mylar strip) for the 2 resin composites. After finishing with a medium polishing disc, the specimens from each resin composite material were subjected to 7 polishing proc...