Materials Literature
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An apparatus has been designed and constructed to characterize thermal interface materials with unprecedented precision and sensitivity. The design of the apparatus is based upon a popular implementation of ASTM D5470 where well-characterized meter bars are used to extrapolate surface temperatures and measure heat flu…
Colloidal gold nanoparticles (spheres) have been prepared from HAuCl 4 containing aqueous solution by using X-ray irradiation and by chemical reduction method. Gold nanorods were synthesized according to the seed-mediated growth method. The colloidal gold nanoparticles were characterized by using transmission electron…
Micrometer-sized, monodisperse, “onionlike” multilayered polystyrene- block -poly(methyl methacrylate) (PS- b -PMMA, volume fraction of PS segment in the block copolymer; f PS ≈ 0.5) particles and PS/PS- b -PMMA/PMMA composite particles with different layer thicknesses ( D ) were successfully prepared by slow release…
The effects of electric and magnetic fields on magnetic and electric properties have been investigated for a triangular lattice antiferromagnet CuCrO(2) showing magnetically induced ferroelectric order. We demonstrate that ferroelectric polarization reversal can be finely tuned by using both magnetic and electric fiel…
Nanoparticle systems are an intense subject of research for various biomedical applications. Colloidal suspensions of magnetic nanoparticles are of special interest, particularly in bioimaging, and more recently, in Magnetic Fluid Hyperthermia (MFH). MFH promises to be a viable alternative in the treatment of localize…
We present a simple, solution-based synthetic route to hollow cerium oxide spheres. Thin layers (∼12 nm) of cerium oxide are deposited onto ∼200 nm silica colloids using cerium nitrate and the silica cores are subsequently removed to yield hollow spheres. The spheres are composed of ∼4 nm ceria nanocrystals. Nitrogen…
Piezoelectric 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3thick film with the thickness around 12 ¿m has been deposited on the platinum bufered Si substrate via a composite spin-coating method. The X-ray diffraction analysis and scanning electron microscopy revealed that the film was in the well-crystallized perovskite phase and c…
Hot-dip galvanized steel sheets with different spangle sizes were deformed by means of rolling and tension. The change of preferential crystallographic orientation and of superficial characteristics due to the deformation was analyzed by means of both X-rays diffraction and optical and scanning electronic microscopy.…
It is well known that there are differences between the fresh mix concrete and the placed concrete sprayed using dry or wet-mix process. Because of that, the characterization of such material is carried out in cores extracted parallel to the spray direction from sample panels. However, in many applications (e.g. tunne…
This paper studies the effect of salinity, alkalinity and amount of ionic and non-ionic synthetic surfactants in the aqueous emulsifier used to prepare oil-in-water or asphaltic emulsions on the performance of such substances as waterproofing on buildings. The emulsion systems studied here were prepared with Venezuela…
The infrared bands of amethyst and prasiolite samples from different origins were correlated to the trace elements contents. Amethysts have an iron content greater than 20 ppm and a low content of sodium and potassium. Prasiolites have an aluminum content greater than 120 ppm and a higher overall trace elements conten…
The present paper reports on an analysis of the mechanical performance of two flat joining systems used in roof members made of glued laminated timber. Six pairs of laminated timber rafters for a double-pitched roof with a 100x180-mm cross-section, a 6.00-m span and a height of 1.00 m were subjected to full-scale four…
The porosity and pore diameter distribution are important characteristics of nonwoven fiber media. With the advent of electrospinning, the production of mats of nonwoven fibrous materials with fiber diameters in the 0.1-10 μm range has become more prevalent. The large compliance of these mats makes them susceptible to…
Derakene is a vinyl ester resin largely employed as matrix for polymeric based composite systems. In this work, the performance of such polymeric system was evaluated considering the effect of hygrothermal aging. The mechanical and thermal properties were examined for the processed material before and after ageing in…
San Francisco de Paula Cathedral, a nineteenth century neoclassical building, epitomizes the ballooning population and thriving economy that prevailed in Brazil at the time. Ever since its construction in 1813 under an initiative of Felício da Costa Pereira and donor Antonio Francisco de los Ángeles (Almanaque Pelotas…
Heavyweight concrete is used for shielding in structures requiring protection against radiation. The addition of superplasticizers to mixes yields workable, high density materials with low water/cement ratios. This paper discusses the results of adding a polycarboxylate-based superplasticizer to heavyweight barite con…
Numerical simulation of solute trapping during solidification, using two phase-field model for dilute binary alloys developed by Kim et al. [Phys. Rev. E, 60, 7186 (1999)] and Ramirez et al. [Phys. Rev. E, 69, 05167 (2004)] is presented here. The simulations on dilute Cu-Ni alloy are in good agreement with one dimensi…
Development of the positive temperature coefficient of resistivity (PTCR) in Er3+ and Ca2+ co-doped ferroelectric BaTiO3 was studied in this work, with Er3+ being used to act as a donor doping. Irrespective of all the materials showing high densities after sintering at 1200 to 1300 ºC, these revealed insulator at the…