Materials Literature
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Vertically aligned carbon nanotubes (CNTs) were grown on a Si substrate by thermal chemical vapor deposition (CVD) and direct current plasma-enhanced CVD with a negative electric field. By contrast, under a positive electric field, CNTs grew randomly. The morphologies of the CNTs grown on Si and quartz substrates were…
Rhizospheric exopolysaccharides (EPS) spontaneously aggregate mineral particles. Molecular dynamics simulations with Cerius2 ® and Materials Studio® programs have been performed to study the adsorption of chemical groups, monosaccharides and oligosaccharides, onto the basal surface of Na-montmorillonite. The estimated…
Neste estudo, foram desenvolvidos eletrodos eletrocatalisadores, a base de céria e Cu, para a oxidação direta de etanol em pilhas a combustível de óxido sólido (PaCOS). Um método alternativo, desenvolvido por Gortes et al [1], foi aplicado para a produção do composto Cu-CeO2-ZEI (zircônia estabilizada com 8% mol de ít…
Abstract Defects in the regular sequence of atomic planes can be frequently met in crystalline materials. Not rare is the case where type, quantity and sequence of this kind of defects influence the properties and behaviour of the material. As a matter of fact, planar defects modify the distribution of intensity in re…
Abstract Changes in physical and chemical properties have been studied for polycarbonate (PC) implanted by 100 keV Ni + with various fluences from 1 × 10 14 to 1 × 10 16 ions/cm 2 . Changes in the surface morphology and composition have been observed with atomic force microscopy and X‐ray diffraction (XRD). Ni particl…
The interactive nature of computer simulation allows students to develop a deeper understanding of the laws of charged particle optics. Here, the use of commercially available optical design programs is described as a tool to aid in solving charged particle optics problems. We describe simple and practical demonstrati…
The first observation and characterization of Lu3+ 4f 135d-4f 14 luminescence from the CaF2: Lu3+ crystal are reported, and the multisite structure in the spectra of Ce3+, Gd3+, and Lu3+ ions in the CaF2 host is analyzed with the high-resolution VUV spectroscopy technique using synchrotron radiation. It is shown that…
Monitoring the condition of electrical equipment insulation by means of partial discharge measurement and analysis is an effective diagnostic tool for the prediction of service failures. In this paper an accelerated aging system specialized for paper insulated lead covered (PILC) cables, with a highly sensitive and se…
Abstract We present optical spectra from the far infrared through the ultraviolet spectral region of freestanding transparent carbon nanotube films: single‐, double‐ and multiwalled, and containing varying amounts of tubes of different chirality. By comparing the spectral features in the far infrared and the near infr…
We investigated controlling parameters of hardness in brittle materials by exploring the correlation between hardness and shear mode cracking. Density functional theory was used to calculate the unstable stacking energies (shear resistance to irreversible deformation) and the surface energies (tension resistance to fr…
We have investigated the influences of surface texture and Bi/Fe ratio on the electric property of BiFeO 3 thin films prepared by chemical solution deposition. All the BiFeO 3 films have a rosette structure, which consists of circular regions with BiFeO 3 crystals and outer regions with amorphous phase. Circular regio…
Abstract Hydroxylpropyl‐ β ‐cyclodextrin (HP‐ β ‐CD) was introduced to the surface of magnetic nanoparticles in the presence of NH 3 ·H 2 O to synthesize magnetic HP‐ β ‐CD composite nanoparticles, which were used as a carrier in magnetic targeted drug delivery. The composite nanoparticles were characterized by FTIR,…
Hydrogen production from oxidative steam reforming of methanol (OSRM) was studied over copper supported on mixed ZrO2-CeO2 oxides. Experimental X-ray diffraction (XRD) results showed the formation of mixed oxide solutions on the sample with 50 wt.-% of zirconia in the support, this finding was associated with low surf…
High-purity nanoparticles ZnS has been successfully synthesized using a simple coupling reaction process of biological reduction and chemical precipitation mediated with EDTA referred to as the CRBRCP-EDTA process. This research investigated the optimum conditions of the transformation of SO(4) (2-) into S(2-) by SRB,…
Current-voltage characteristics have been obtained on lead zirconate titanate bulk ceramics using robust measurement techniques separating polarization effects from actual charge transport. Measurement of the electrical conduction upon both increase and decrease in the electric field shows that long settling times are…
Copper specimens have been exposed to the action of marine, marine industrial, urban and rural atmospheres of Saudi Arabia. Environmental factors such as average temperature, average relative humidity and deposition rates of atmospheric pollutants (i.e. Cl- and SO2) was investigated. By applying the standard ISO 9223,…
Calcium-containing spherical bodies (calcospherulites) exist along the mineralization front of bone and are thought to play a role in bone formation. Existing methods to isolate calcospherulites involve harsh treatments that remove much of their organic matter. This study sought to isolate them using a less destructiv…
Compressive stress-strain curves were generated for a pressed and sintered mixture of polytetrafluoroethylene and aluminum powders. Experiments were performed at strain rates ranging from 0.001 to 8000/s using a servo-hydraulic load frame and a split Hopkinson pressure bar. High-rate experiments were also performed ov…
The properties of a polymer are strongly influenced by its morphology. In the case of fibers from semi-crystalline polymers this consists of the degree of crystallinity, the spacing and alignment of the crystalline regions, and molecular orientation of the polymer chains in the amorphous regions. Information on crysta…
A fibre-level model for the longitudinal absorption of liquid water in wood has been developed. The model is primarily intended for simulation of absorption in softwoods. Capillary suction is based on the lumen radius, which is a stochastic parameter. The average lumen volume (and thus radius) is assumed to vary linea…