Materials Literature
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The optimization of the formulation (nature and content of chemical components) and the technical parameters of the shaping-up process of ceramic insulators (in replacement of those in glass) are the objectives of this study. The decontamination of SiO2 (solid-liquid extraction of Fe xOy) and the increase of both BaO…
Unswept and vacuum-swept synthetic quartz crystals were investigated in order to determine the mechanisms responsible for the radiation sensitivity of this material. Results were obtained by means of infrared (IR) spectroscopy, dielectric relaxation spectroscopy (DRS), and thermoluminescence (TL). First, the effect of…
Ni(II) and Zn(II) phthalocyanines carrying four or eight branched oligo(ethyleneoxy)-thia groups on peripheral positions have been synthesized from new phthalonitrile derivatives. The new compounds have been characterized by elemental analysis, IR, NMR, mass spectra and electronic spectroscopy. The aggregation behavio…
The present review covers the deconsolidation aspects of refractory polycrystalline skeletons for composites based on refractory particles with a metal binder. The thermodynamics of the process has been highlighted. The criterion for deconsolidation is established and the mechanism has been described.
The magnetoresistance of thin polycrystalline La1-xSrxMnO3 films deposited on lucalox substrate using metal organic chemical vapor deposition technique was investigated in pulsed magnetic fields up to 18 T in the temperature range 100-320 K. The influence of film preparation conditions, ambient temperature variation a…
Strong magnetoelectric (ME) coupling can be realized in multiferroic heterostructures, which have led to a variety of devices. However, it has been challenging in achieving strong ME coupling at microwave frequencies. Here, we report on novel FeGaB/Si/PMN-PT and FeGaB/PMN-PT microwave multiferroic heterostructures, wh…
We measured light scattered from gold nanoparticles with darkfield microscopy in order to perform single molecule detection based on tethered particle motion (TPM). This combination results in a signal to noise ratio of about 40 dB, which allowed us to use 80 nm diameter gold particles as reporters instead of the typi…
Abstract Sector zoning in solid solutions of Tutton’s salts (NH 4 ) 2 M(SO 4 ) 2 .6H 2 O (M = Co, Ni, Zn, Mg) and nitrates of divalent metals Me(NO 3 ) 2 (Me = Sr, Pb, Ba) grown from low- T aqueous solutions under controlled conditions is studied. The effect of crystal composition and growth rate (supersaturation) on…
Abstract Synthetic siliceous mesoporous materials are of great value in many different applications, including nanotechnology, biotechnology, information technology, and medical fields, but historically the resource materials used in their synthesis have been expensive. Recent efforts have focused on indirect synthesi…
Vanadium dioxide is investigated as potential oxide barrier in spin switches, and in order to incorporate VO2 layers in complex multilayer devices, it is necessary to understand the relation between bulk and surface/interface properties. Highly oriented VO2 thin films were grown on (0001) sapphire single crystal subst…
The physical-mechanical and relaxation properties of nanocomposites based on chitosan graft copolymers with poly(vinyl alcohol) and nanodispersed titanium oxide, where a high dispersity of the initial nanofillers was retained until high loading, were studied. The stabilization of the molecular mobility within the temp…
O objetivo deste trabalho foi avaliar temperaturas de armazenamento e embalagens para abóbora minimamente processada. Pedaços de abóbora foram cortados em tamanho de 5 x 10 cm, embalados em bandejas de poliestireno recobertas com filme polivinilcloreto e em embalagem de polietileno de alta densidade a vácuo. O produto…
The lattice vibrational modes of spinel structured CoCr2O4 have been calculated using a rigid-ion model. In this model the short-range force constants have been calculated by using a Taylor expansion of the potential energy in the harmonic approximation, and the long-range part was evaluated on the basis of the screen…
Barium titanosilicates are possible oxide forms for the immobilization of short‐lived fission products in radioactive waste. Ba 2 TiSi 2 O 8 (fresnoite) and BaTiSiO 5 (Ba‐titanite) samples were prepared by a solid‐state synthesis. The enthalpies of formation of Ba 2 TiSi 2 O 8 crystal and glass at 25°C and of BaTiSiO…
Abstract Reflex™ electronic skin displays can be conformed to cover the case of electronic consumer devices allowing the consumer to instantaneously switch the case color electronically. These displays have inherent reflective color and an ultra thin and flexible form factor. The optical performance, environmental rug…
The polarization state of light transmitted through a polymer-dispersed liquid-crystal film with small, spherical, nonabsorbing, partially oriented nematic droplets is theoretically investigated. The model used is based on the effective medium approach. Scattering properties of a single droplet are described by the Ra…
Poly(carboxylic acid) hydrogel films and hollow capsules undergo reversible size changes in response to variations in pH and/or ionic strength. The films and capsules were obtained from hydrogenbonded poly-N-vinylpyrrolidone/poly(carboxylic acid) layer-by-layer films by chemical crosslinking of the polyacid, followed…
The photo‐stimulated luminescence spectroscopy (PSLS) technique provides the means to establish stress dependencies of the well‐known R ‐line peak positions in polycrystalline alumina. The uniaxial compression tests presented in this paper, which determine the coefficients describing this piezospectroscopic (PS) behav…
Chitosan/gelatin microparticles were prepared by complex coacervation. Three chitosan (CH) samples, with different acetylation degrees and intrinsic viscosities, were used together with commercial gelatin (G) samples. Microparticles formation was investigated at various CH/G ratios, within the pH range of 3.5 to 6.0.…
Abstract Knitted products have a flexibility that offers many attractive possibilities. Combined with technical fibres, this gives interesting and innovative possibilities. Many technical fibres and yarns has however properties such as high stiffness and brittleness which are difficult to process in the practice of we…