Materials Literature
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O crescimento do consumo de plásticos vem gerando grandes problemas ambientais, pois um polímero, uma vez descartado no ambiente, necessita de mais de cem anos para se degradar. O plástico ideal deve apresentar propriedades industriais desejáveis e, ao mesmo tempo ser degradável num período considerado satisfatório. B…
Photochromic diarylethene forms super water-repellent surfaces upon irradiation with UV light. Microfibril-like crystals grow on the solid diarylethene surface after UV irradiation, and the contact angle of water on the surface becomes larger with increasing surface roughness with time. The fractal analysis was made b…
Abstract Chrysocapsa flavescens (Chrysophyceae), Botrydiopsis constricta (Xanthophyceae), and Chlamydomonas pseudogloeogama (Chlorophyceae) were recovered from the alpine zone and constitute new records for New Zealand. Pseudococcomyxa simplex and Stichococcus sp. were also found and subjected to molecular phylogeneti…
Abstract Diatom communities in alpine-zone streams of the Tatra National Park and the Swiss National Park were heterogeneous with respect to species richness, abundance, Shannon diversity index, and ecological preference. Two groups of diatoms were distinguished. Group 1, inhabited streams in the upper Gąsienicowa Val…
This paper deals in general with fabrics consisting of bicomponent fibers that are fractured/fibrillated and bonded using mechanical and/or thermal means to form micro-denier fibers. Bicomponent filaments produced by the spunbonding process, where two polymers are co-extruded to form a fiber are used to demonstrate th…
The paper presents results of investigation of the influence of copper nanoparticles (of mean diameter 66 nm and mass share – 3.5%) on erosive wear of acrylic coatings. It was demonstrated that addition of copper nanoparticles increased the erosive wear resistance of modified coatings in the range from 25% for impact…
O objetivo deste trabalho foi o estudo do efeito do Grau de Hidrólise (GH) do poli(vinil álcool) (PVA) nas propriedades dos filmes à base de blendas de gelatina suína e PVA com dois GH. Os filmes foram produzidos com soluções com 2 g de macromoléculas/100 g de solução, contendo 23,1 g de PVA.100 g-1 de macromoléculas…
Abstract Being single‐walled carbon nanotubes, archetypical 1D systems with peculiar anisotropic electronic properties, it is possible to infer modifications in a controlled manner by filling their inner hollow space. One successful approach was proposed for Gd, which regards filling with metallofullerenes and a succe…
Some high birefringence ester liquid crystal compounds with cyanate or isothiocyanate polar groups were investigated, the relaxation frequency of which is in the kilo‐Hertz region. These compounds are useful for formulating dual‐frequency liquid crystal (DFLC) mixtures. The dielectric relaxation and electro‐optical pr…
Multiferroic Co-substituted BiFeO 3 films were fabricated by chemical solution deposition method followed by post deposition annealing at various temperatures. The substitution of cobalt of B -sites for iron in BiFeO 3 was promoted at relatively high temperatures. The B -site substitution by cobalt promoted increases…
Abstract A novel method for the continuous dispersion of carbon nanofibers (CNFs) in a polymer matrix for manufacturing high performance nanocomposites was developed using an ultrasonically assisted single screw extrusion process. The effect of ultrasound on die pressure, electrical and thermal conductivity, rheologic…
This paper reviews the status and recent progress achieved in the research of thermal interface materials (TIMs). The focus is on the research work performed in academia. The research and development work carried out in industry is also generally introduced. The existing TIM technologies have been categorized into eig…
Hardening and overaging mechanisms were examined in a semi-precious Au−Ag−Cu−Pd dental alloy with small amounts of In, Zn and Ir. The alloy showed maximum age-hardenability at the aging temperature of 400°C. The hardness value increased to reach the maximum value, and then decreased continuously with aging time. In th…
Electronic and optical properties of single-walled zinc oxide (ZnO) nanotubes are investigated from the first-principles calculations. Electronic structure calculations show that ZnO nanotubes are all direct band gap semiconducting nanotubes and the band gaps are relatively insensitive to the diameter and chirality of…
A directed synthesis of monohydroxyphthalocyanines has been developed; using the phthalocyanine–O-subphthalocyanine complex as an example, it has been shown that they can be used as building blocks in syntheses of heteronuclear complexes.
The transport between different equipment and unit operations plays an important role in pulp and paper mills because fiber suspensions differ from all other solid-liquid systems, due to the complex interactions between the different pulp and paper components. Poor understanding of the suspensions’ flow dynamics means…
There is growing awareness that electrochemical energy storage alone cannot meet the demanding vehicle propulsion applications and still retain design targets for cycle and calendar life. Add to this the sharp roll-off in advanced chemistry battery power capability at cold temperatures, the negative influence of deep…
This paper presents the evaluation of the performance of these cables in the field and to review the improvements that have been made within Europe. In the early 1980s, the first generation of medium voltage cables were made with graphitized outer screen, double extrusion, polyvinylchloride (PVC) sheaths, and classic…
Abstract Hydrogen flux through palladium membrane supported on α-alumina significantly decreased during permeation testing at elevated temperatures (650–850 °C). Strong interaction between palladium and α-alumina, i.e., formation of less hydrogen permeable palladium–aluminum alloy was suggested via reduction of alumin…
Over the years, we have investigated particulate matter (PM) and$ \hbox{NO}_{\rm x}$reduction using nonthermal plasma-chemical hybrid processes without using catalysts. Among nonthermal plasma hybrid processes, the ozonizer combined with the chemical hybrid reactor was investigated using a 479 cc (5.5 kW) power genera…