Materials Literature
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The effect of the plasma pretreatment using a biased sample holder on amino group introduction onto a polyethylene (PE) surface is reported. Ar or N 2 plasma was used for the pretreatment and was followed by ammonia plasma treatment for 30 s. X-ray photoelectron spectroscopy (XPS) and chemical derivatization were used…
Focusing of an electromagnetic wave radiated by a point source and transmitted through a plane layer filled with a medium with negative refractive index is considered. An elementary electric Hertzian dipole located in the air (or vacuum) parallel to the boundaries of the layer is considered as a point source of radiat…
The structures and properties of some Schiff base compounds doped in organogels were investigated. It was found that although individual Schiff bases could not form organogels with organic solvents, they can gel by mixing with an organogelator, N,N′-bisoctadecyl-L-Boc-glutamic-diamide, which formed transparent organog…
High density boron carbide nanowires are grown by an improved carbon thermal reduction technique. Transmission electron microscopy and electron energy lose spectroscopy of the sample show that the synthesized nanowires are B 4 C with good crystallization. The field emission measurement for an individual boron nanowire…
Zinc oxide microcrystal tubes were prepared by using H 2 O 2 -activated Zn powder and active carbon as raw materials. The prepared samples were characterized by powder X-ray diffraction, scanning electron microscopy and fluorescence spectrophotometer. The results indicate that ZnO microcrystal has tubular structure wi…
Crystal field effects in rare-earth ferroborates R Fe 3 (BO 3 ) 4 with various rare-earth elements are studied theoretically. The rare-earth magnetoelastic interaction Hamiltonian is written in a multipole approximation. The field and temperature dependences of the multipole moments and strain susceptibilities of rare…
BaTiO 3 thin films were fabricated at 650 °C by single sintering using additive-free and diethanolamine (DEA)-modified alkoxide solutions. The BaTiO 3 thin films derived from the DEA-modified solution had a flat surface and an rms roughness below 2.5 nm. The grain size on Pt/Ti/SiO 2 /Si substrates single-sintered at…
Abstract Smooth polypyrrole (PPy) films were successfully electrosynthesized on a stainless steel (SS, 1Cr18Ni9) surface by a self‐catalytic two‐step process. SS substrate dissolution during PPy electrosynthesis was effectively depressed. The redox properties and corrosion behavior of PPy film coated SS electrodes wer…
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,…