Materials Literature
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As regiões do Rio Capim e do Rio Jari são os principais distritos caulinitícos da Região Amazônica, detentores das maiores reservas brasileiras de caulim de alta qualidade para aplicações como cobertura de papel. O caulim é lavrado e beneficiado por três grandes companhias que são responsáveis pela geração de aproxima…
Barium strontium titanate (BST) ceramics (Ba0.6Sr0.4)TiO3 were synthesized by solid state sintering using barium carbonate, strontium carbonate and rutile as the precursor materials. The samples were doped with nickel oxide in different proportions. Different phases present in the sintered samples were determined from…
Muitos alimentos possuem ingredientes ou compostos bioativos que oferecem benefícios à saúde. O colágeno, que é uma proteína fibrosa encontrada nos tecidos conjuntivos do corpo, tem a função de contribuir com a resistência e elasticidade dos tecidos. Em virtude de suas características funcionais, essa proteína tem sid…
Experimental studies have shown that flexible woven fabrics can absorb significant kinetic energy from both projectile and fragment impacts through a combination of design factors which include yarn materials, weaving architectures, yarn density ratios, as well as the projectile mass, shape and velocity. 1–3 This pape…
Abstract The influence of the concentration of purine (PU) on the corrosion of 304 austenitic stainless steel (SS) in chloride acid solutions was studied. The investigations involved electrochemical polarization methods and scanning electron microscopy. The inhibition efficiency increased with an increase in the conce…
This research is a comparative study of the physical properties of mechanical compact and conventional spun yarns and fabrics knitted from these yarns. To experiment the relational behavior, mechanical compact and conventional spun cotton yarns were produced in three different yarn linear densities having three twist…
The antimicrobial activity of the total alkaloids from five medicinal plants namely Jatropha curcas, Calotropis procera, Magifera indica, Carica papaya and Psidium guajava, commonly used in northern Nigeria for the treatment of various ailments was evaluated using disc diffusion assay. The extracts were used against t…
Polylactic acid (PLA)/polybutylene succinate (PBS) and the PLA/PBS/montmorillonite (MMT) composites were prepared by melt extrusion. The morphology structure, mechanical, thermal, and dynamic rheological properties of the composites were characterized, as well as foaming extrusion behavior of the composites was also s…
BACKGROUND: A multifunctional telodendrimer-based micelle system was characterized for delivery of imaging and chemotherapy agents to mouse tumor xenografts. Previous optical imaging studies demonstrated qualitatively that these classes of nanoparticles, called nanomicelles, preferentially accumulate at tumor sites in…
A series of Co-doped ZnO thin films were prepared under various deposition conditions using the pulsed laser deposition method. X-ray photoelectron spectroscopy (XPS) and XPS depth profiling were used to detect the elemental valence states of Zn, Co and O. It was found that the films deposited under low temperature an…
The piezoelectric, dielectric, and ferroelectric properties of the (LiCe) co-substituted calcium bismuth niobate (CaBi 2 Nb 2 O 9 , CBNO) are investigated. The piezoelectric properties of CBNO ceramics are significantly enhanced and the dielectric loss tan δ decreased. This makes poling using (LiCe) co-substitution ea…
Coarse graining procedures are intended to well reproduce the structure of a material while increasing the simulations efficiency. However, the dynamics usually accelerates with coarse graining and a scaling procedure has to be used for dynamical data calculations. Most often a simple time-scaling coefficient is used…
This paper presents a study wherein the Laser Sintering (LS) process is used to perform additive manufacturing of zirconium diboride (ZrB2) parts. Experiments were conducted to determine values of LS process parameters (laser power, scan speed, energy density, line spacing, and layer thickness) that can be used to imp…
The poor bioavailability and therapeutic response exhibited by conventional eye drops due to rapid precorneal elimination of the drug may be overcome by the use of an in situ gelling systems that are instilled as drops into the eye and undergo a sol-to-gel transition in the cul-de-sac which improves patient compliance…
Nanocomposite fibers based on multi-walled carbon nanotubes (MWCNT) and poly(lactic acid) (PLA) were prepared by solution blow spinning (SBS). Fiber morphology was characterized by scanning electron microscopy (SEM) and optical microscopy (OM). Electrical, thermal, surface and crystalline properties of the spun fibers…
An oscillating bubble near another (stationary) bubble can give rise to interesting interactions. Such a nonequilibrium (oscillating) bubble can create a jet in a smaller nearby (initially stationary) bubble as demonstrated in this study both experimentally and numerically. In the experimental study, a spark-generated…
AC (alternative current) resistivity measurement results on Mn-Zn sintered ferrite were analyzed in the 0.1–500 MHz range. From electrical point of view, the material could be represented by an equivalent circuit of parallel resistance-capacitance cells connected in series corresponding to the contributions from bulk…
La(Fe,Si)13 alloys display a giant magnetocaloric effect when a magnetic field is applied near the Curie temperature TC. However, to use these alloys for domestic refrigeration based on magnetic cooling, it is vital to increase TC near to the room-temperature range while simultaneously maintaining a large magnetocalor…
Polyethylene terephthalate (PET) was depolymerized using trimethylolpropane (TMP) and glycerin as a binary solvent mixture to provide oligomeric polyol for rigid polyurethanes foam formulation. Recyclate containing rigid polyurethane foam nanocomposites were prepared by introducing of different portions (1-5%) of nano…
Theoretical methods are critical to our understanding of defect formation in block copolymer lithography processes. We have previously applied self-consistent field theory (SCFT) to study the energetics of dislocation and disclination defects prevalent in graphoepitaxy of "standing up" lamellae, and present results of…