Materials Literature
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Abstract The effects of Y 2 O 3 and Er 2 O 3 on the sintering behaviors, thermal properties and microstructure of AlN ceramics were investigated. The experimental results show that the sintering temperature can be decreased; the relative density and thermal behavior can be improved by adding rare earth oxide in AlN ce…
UNLABELLED: Chitosan is a D-glucosamine polysaccharide derived from chitin that displays an antimicrobial activity against bacteria and fungi. OBJECTIVE: to evaluate the antifungal effect of high molecular weight chitosan (HMWC) in clinical strains of Candida spp. METHODOLOGY: the susceptibility of forty strains of Ca…
Extremely thin diamond-like carbon (DLC) films are deposited by the filtered cathodic vacuum arc (FCVA) and plasma chemical vapour deposition (p-CVD) methods. The target thicknesses of the extremely thin protective DLC films deposited on a Si (100) surface by FCVA and p-CVD are 0·1, 0·4, 0·8, 1·0, 2·0, 5·0 and 100·0 n…
This paper treats approximate solutions for a self-folding problem of carbon nanotubes. It has been observed in the molecular dynamics calculations (Buehler, Kong, Gao, and Huang, 2006, “Self-Folding and Unfolding of Carbon Nanotubes,” ASME J. Eng. Mater. Technol., 128, pp. 3–10) that a carbon nanotube with a large as…
This paper reports on the results of investigations of the crack growth kinetics in glasses under different test conditions (in media containing moisture and under vacuum with the complete removal of water from the glass surface) in the test temperature range from room temperature to 430°C. The specific features of th…
Fiber optic reflectometry (FOR) and scanning electron microscopy (SEM) were used to study the regularities of the etching of a single-mode optical silica fiber with a germanium silicate core in subcritical and supercritical water. It was demonstrated that the rate of etching of the germanium silicate core, being highe…
RESUMEN. Catálogo de las algas verdes cocales de las aguas continentales de Andalucía. En España los estudios realizados de los ecosistemas acuáticos continentales han tenido sobre todo un enfoque ecológico. En la mayoría de los trabajos limnológicos las algas se han considerado como productores primarios en su conjun…
Abstract : This thesis investigates the use of porous materials in a multi-layered armor concept. The prototype layered structure consists of an initial high-strength material to slow down the projectile and cause significant plastic deformation, followed by an orthotropic wave-spreading layer to spread shock waves la…
In this work gasochromic effect in TiO2 thin films doped with palladium and tantalum (without catalyst film) have been described. The results have shown that in nanocrystalline TiO2:(Ta, Pd), with anatase structure, the film colorization effect in alcohol presence was observed. Both colorization and also bleaching eff…
Effects of mean powder size and size distribution on the microstructure and magnetic properties of anisotropic NdFeB sintered magnets were investigated. The hydrogen-decrepi- tated NdFeB alloy was jet milled and the jet-milled powder was subsequently divided by a classifier in order to eliminate coarse and fine partic…
Abstract Manganese dioxide (MnO 2 ) particle was synthesized and introduced into epoxy resin to be microwave absorber. The spectroscopic characterization of the formation processes of MnO 2 was studied by using X‐ray diffraction (XRD) and scanning electron microscopy (SEM). Microwave absorbing properties with differen…
A size-controlled synthesis of gold nanoparticles has been developed by the thermolysis of AuCl(SMe 2 ) in the presence of alkylamines at 120 °C. In the procedure, the key intermediate was [Au(NH 2 R) 2 ]Cl, detected by electrospray ionization (ESI) mass spectrometry. This thermally unstable intermediate was reduced b…
Polycaprolactone-polylactide block copolymers (PCL-block-PLA) were grafted onto filled multi-wall carbon nanotubes (MWCNT) successfully. In this synthesis, MWCNTs were opened and functionalized, and then they were filled by silver nanoparticles. The filled MWCNT were used as macroinitiator for ring opening polymerizat…
(Pb1-xSrx)TiO3 (PST) (x=0.25, 0.50) powders were synthesized by a mixed oxide solid-state reaction method under various calcination temperatures (600-1100oC). Powder samples were characterized using thermogravimetric (TGA), differential thermal analysis (DTA), x–ray diffractrometer (XRD) and scanning electron microsco…
The dependences of the permittivity and electrical resistivity on the temperature and the frequency of the clock signal in electrochemical cells fabricated from a two-phase composite of the PbSe + PbSeO 3 system in the form of pressed pellets have been investigated by impedance spectroscopy. It has been shown that the…
A combination of two catalysts, Au/TiO 2 and TS-1 were used to catalyze the demanding reaction of butene epoxidation in an aqueous solution using molecular oxygen under very mild reaction conditions. Peroxy initiator was not necessary but carbon monoxide as a sacrificial reductant was needed. Carbon monoxide conversio…
We use ab initio theoretical methods to study the relative stability under pressure of the zircon, scheelite and fergusonite structures in the LuVO4 and ScVO4 orthovanadates. In LuVO4, our study confirms the zircon→scheelite→fergusonite sequence of stable phases proposed in previous experimental works. In ScVO4, we fi…
A new polymorphic modification, α-LiKZnP 2 O 7 , has been synthesized, which is a low-temperature modification of the LiKZnP 2 O 7 compound. The crystal structure is determined by the Rietveld method from the X-ray powder diffraction data. The compound crystallizes in the monoclinic system (space group Pc , a = 12.362…
In this paper, we present new temperature-programmed desorption measurements from implanted single and polycrystalline beryllium as well as new computational results on the diffusion of interstitials through an undisturbed beryllium lattice. The threshold fluence for the appearance of a low-temperature desorption regi…
Plate-like hydrated cerium phosphate, Ce 2 (PO 4 ) 2 HPO 4 · H 2 O , ca. 3 μm in diameter, was obtained by the hydrothermal reaction of Ce(SO 4 ) 2 in H 3 PO 4 aqueous solution at 150–200°C. Ce 2 (PO 4 ) 2 HPO 4 · H 2 O transformed to CeP 2 O 7 –CePO 4 mixture around 700°C while maintaining the plate-like morphology.…