Materials Literature
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Five surface-treatment methods for working rollers are compared: shot blasting, electrical-discharge texturing, laser treatment, and electron-beam texturing, as well as the Topocrom method, in which a chromium layer is applied to the roller surface. These methods are used to ensure standard surface microtopography in…
The Eu2+-activated Sr2Mg3P4O15 (Sr2Mg3P4O15:Eu2+) phosphor is prepared using solid-state reactions of SrCO3, MgO, (NH4)2HPO4, and Eu2O3. The phosphor is excited efficiently by near-ultraviolet (n-UV) light irradiation, showing bright blue emission spectra at wavelengths of 400–550 nm with a maximum peak of 447 nm. The…
The transport and magnetic properties of Mn x Si1 − x films with a high (x ≈ 0.35) content of Mn produced by laser deposition at growth temperatures of 300–350°C have been studied in a temperature range of 5–300 K in magnetic fields of up to 2.5 T. The films exhibit a hole-type metallic conductivity and a relatively w…
Noncentrosymmetric crystals of iodates and titanates have been systematized, and the principles of the design of new nonlinear optical materials by means of revealing empirical composition-structure-property relationships have been considered. It is demonstrated that, in the diagram of chemical bond lengths, noncentro…
The incorporation of synthetic silica nanoparticles into polypropylene is shown to increase the ac breakdown strength compared to unfilled material. This breakdown strength stays unchanged during application of a 40 kV/mm dc field for up to 500 h at both, room temperature and 90°C. Dielectric spectroscopy shows an inc…
Abstract The interest in cellulose produced by bacteria from surface cultures has increased steadily in recent years because of its potential for use in medicine and cosmetics. Unfortunately, the low yield of this production process has limited the commercial usefulness of bacterial cellulose. The aim of this paper is…
Prehnite from the Jeffrey mine, in Asbestos, Quebec, has been investigated by optical microscopy, electron-microprobe analysis, single-crystal X-ray-diffraction (XRD) analysis, and electron paramagnetic resonance (EPR) spectroscopy. Electron-microprobe analyses yield an average iron content of 0.053(34) wt% Fe 2 O 3 ;…
Samples of α-Al2O3:Mg were obtained using polymer calcination method, with five different concentrations of magnesium. ICP-AES analysis showed the magnesium concentrations to be: 0.47, 0.88, 1.33, 2.61 and 3.36 mol%. Scanning Electronic Microscopy (SEM) indicated the occurrence of a nanometric layer over the α-Al2O3 c…
Article Moisture pickup in calcium carbonate coating structures: role of surface and pore structure geometry was published on August 1, 2009 in the journal Nordic Pulp & Paper Research Journal (volume 24, issue 3).
The composite films of ferroelectric potassium nitrate (KNO3):poly(vinyl alcohol) (PVA) with different weight percentages of KNO3 have been prepared at 200 degrees C using the spray-deposition technique. The remanent polarization (Pr) and peak current density for all composite films was estimated by tracing the polari…
Variations in the size distribution of CuCl particles in the glass formed at different temperatures are studied via the temperature-dependent exciton spectra (the exciton-thermal analysis). The kinetics of melting of CuCl nanocrystals is measured via changes in the strength of exciton absorption during linear heating…
Rare earth activated Y TaO4 based phosphors are perspective materials for optoelectronics. The paper presents some physical and chemical aspects related to the influence of the host lattice composition and crystalline order on the luminescence of rare earth ions. In this respect, Eu-activated Y (Ta,Nb)O4 powders have…
The Mg-, Al sorbent with a structure of hydrotalcite Mg 4 Al 2 (OH) 12 · CO 3 · n H 2 O was synthesized and its thermoactivated form Mg 4 Al 2 O 7 was investigated in sorption processes. Physicochemical investigations demonstrated that the resultant sorbent (Mg 4 Al 2 O 7 ) displays high sorption selectivity with resp…
Chiral nihility media are known to produce a backward wave as one of their two polarizations, yielding negative refraction at the interface of the chiral nihility medium and free space. In this paper, the analysis of chiral nihility effects is illustrated by showing the propagation of a Gaussian beam, both reflected a…
This work deals with the inception and the growth of electrical treeing inside different Low Density Polyethylene (LDPE) nanocomposites. Two nanoflllers were adopted: sepiolite and montmorillonite. Both nanoflllers belong to the family of silicate clay minerals but have different aspect ratio. The nanocomposites have…
We report neutron reflectivity results on a three-layer polystyrene thin film on Si wafer, consisting of alternative stacking of deuterated layer ~20 nm thick and hydrogenated layer ~30 nm thick. In the experiments we have evaluated the film thickness of each layer and the surface roughness and interfacial widths as a…
Epoxy resins with controlled high-order structures show higher thermal conductivity than conventional ones, because the ordered-structure domains consisting of self-arranged `mesogen' groups of epoxy monomers promote smooth phonon transportation. In this report, we investigated composites consisting of these resins an…
Abstract In this work the structure of a hexachloroplatinate of a bivalent metal as iron with the formula FePtCl 6 · 6 H 2 O is reported. The crystal contains [PtCl 6 ] 2– and [Fe(H 2 O) 6 ] 2+ ions adopting a regular octahedral coordination. A 3D hydrogen bond framework takes part in the cohesion of the structure pak…
che der Partikel mit Detergens funktionalisiert. Vor bzw. nach Zugabe des Matrixpolymers in das organische Lsungsmittel werden Agglomerate durch mechanischen Energieeintrag dispergiert. Der Einfluss auf den dispersen Zustand und die Stabilitt des Organosols wird beschrieben. Die adsorbierten Detergensmolekle sorgen fr…
The luminescence spectra of naturally occurring apatite Ca5[F∣(PO4)3] and fluorite CaF2 crystals, containing traces of rare-earth elements have been compared with phosphate glasses doped with Pr3+, Sm3+ and Er3+ ions. The selected excitation bands for luminescence of samarium and praseodymium ions were indicated. Sepa…