Materials Literature
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The introduction of ceramics into the market of wood cutting tools has been difficult because of the generally low toughness of ceramics which causes brittle failure. That is why the improvement of mechanical performance of ceramics with potential to be used as cutting tools is important. The newly developed Si 3 N 4…
This review summarizes current data on structure of the most representative group of the collagen family--fibrillar collagens. Attention has been focused on structural organization of individual domains and their functional role in the hierarchical stacking of alpha-chains of collagens. There is presented characterist…
The technique of calculation of a feeding zone for a single screw extruder is developed taking into account the nonisothermal process and the actual boundary geometric conditions and speed conditions (the screw is rotated, the cylinder is fixed). An analysis of the influence of the screw geometry was performed and als…
We use Self-Consistent Field Theory (SCFT) to study the directed self-assembly of laterally confined diblock copolymers. In this study, we focus on systems where the self-assembled lamellae are oriented parallel to the selective sidewalls of the channel. While well-ordered, perfect lamellae are observed both experimen…
Kraft pulping of hydrolyzed green bamboo (Dendrocalamopsis oldhami) chips was performed under various conditions to determine the effects of process variables (alkali charge, sulfidity, cooking temperature, and cooking time) on the dissolution of the lignocellulosic components, i.e. lignin, pentosans, and cellulose. M…
Surface coating often alters or improves the performances of materials. In Mg alloys, surface treatment plays a key role in rendering them appropriate for widespread applications. Here, a thermal diffusion method of antimony and zinc is applied to deal with the surface of Mg alloys AZ31 in order to improve their funct…
A different way of producing the magnetic waveguide by loading gradually varied magnetic fields on graphene is proposed. The vector potential induced by the magnetic fields is connected by two square magnetic barriers and one magnetic well with linear variation. We investigate the guided modes and probability current…
In this paper, we explore diamond synthesis with a series of experiments using an Fe—Ni catalyst and a P 3 N 5 additive in the temperature range of 1250–1550 °C and the pressure range of 5.0–6.3 GPa. We also investigate the influence of nitrogen on diamond crystallization. Our results show that the synthesis condition…
Dispersion composition and the distribution of functional groups over the surface and in the bulk of particles of spent ion exchangers in the course of mechanochemical destruction, a key issue for choosing further application area of the resulting materials, were studied.
In this work, the effect of low pressure plasma and atmospheric-pressure plasma treatment on surface properties and adhesion characteristics of high performance polymer, Polyether Ether Ketone (PEEK) are investigated in terms of Fourier Transform Infrared Spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), an…
Successful doping of Eu3+ ions into ZnO nanocrystals has been realized by using a low temperature wet chemical doping technique. The substitution of Eu3+ for Zn2+ is shown to be dominant in the Eu-doped ZnO nanocrystals by analyzing the X-ray diffraction patterns, transmission electron microscopy images, Raman and sel…
The physical properties of polystyrene composites containing different concentrations of iron (0, 5, 10, 20 and 30 wt.%) were studied as a function of ultraviolet (UV) wavelength, iron concentration, temperature, and applied field frequency. The absorption spectra were collected using the UV-spectrophotometry, and the…
We proposed intercalation of hexagonal boron nitride (hBN) in multilayer graphene to improve its performance in ultra-scaled interconnects for integrated circuit. The effect of intercalated hBN layer in bilayer graphene is investigated using non-equilibrium Green's functions. We find the hBN intercalated bilayer graph…
Based on the property of angular dependent transmission probability of electrons observed in graphene PN junctions, a modified MUX-based graphene logic device is introduced. A more elaborate resistance model including ON resistance, leakage resistance and contact resistance is given as well as a capacitance model of t…
Oxidation of olefins with tert-butyl hydroperoxide (TBHP), tetra-n-butylammonium periodate (TBAP) and potassium peroxomonosulfate (Oxone) in the presence of MCM-41 immobilized meso-tetra-4-carboxyphenylporphyrinatomanganese(III) acetate has been studied. The results of this study show better catalytic performance of t…
The adsorption and corrosion inhibition behaviour of ceftezole (CFZ) at mild steel surface were studied gravimetrically and electrochemically by using electrochemical impedance spectroscopy (EIS) and Tafel polarization techniques. The increase in concentration, immersion time and temperature shows a positive effect on…
We report a study on a liquid-thermoelectric hybrid cooling that allows a multiple larger heat flux (>;600 W/m2) hotspots on a chip that is never achievable with a reasonable pump power for a microchannel with single phase liquid cooling. Thermoelectric effect is realized in this study by embedding to the silicon chip…
The physical and electrical properties of SixSb2Te system materials with various Si contents have been systemically studied with the aim of finding the most suitable composition for the phase change random access memory (PCRAM) applications. SixSb2Te shows better thermal stability than Ge2Sb2Te5 due to no Te separatio…
No Estado do Rio Grande do Sul (RS), os Neossolos Litólicos e Neossolos Regolíticos são solos que têm sofrido forte pressão de uso, demandando maior conhecimento sobre sua gênese e mineralogia. O objetivo deste trabalho foi determinar o grau de intemperismo de Neossolos Litólicos e Neossolos Regolíticos, avaliando-se…
The main stages of the self-assembling of supramolecular ensembles have been revealed by studying different functional wedged macromolecules: polymethacrylates with tapered side chains based on gallic acid, their macromonomers, and salts of 2,3,4- and 3,4,5-tris(dodecyloxy)benzenesulphonic acid. The first stage is the…