Materials Literature
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In the present work the observation of the photorefractive effect in a cell filled with nematic liquid crystal under electric-field application is reported. Photorefraction is caused by formation of a spatial inhomogeneous charge distribution due to the Helfrich-Carr effect in the absence of light-excited charge carri…
Using a Lorentz-Drude model, we determine optical constants in the range from 300 to 1000 nm for CdIn(2)O(4) thin films deposited by rf reactive sputtering from the measurement of transmission and reflection. We discuss the effect of deposition conditions including substrate temperature and oxygen concentration in a r…
Nylon-6 chain extension by means of reactive processing in the presence of triphenyl phosphite (TPP) was investigated using an internal mixer coupled with a torque sensor. The molecular weight was dependent on TPP concentration, processing time, polymer drying conditions, rotational speed and processing temperature. T…
An experimental study of gas-phase combustion synthesis of silicon dioxide (SiO2) particles was conducted in C3H8/air and H2/air premixed flames. Two types of organosilicon compounds, HMDSO and HMDSA. were used as the silicon precursors of synthesis processes. The objective of this investigation was to study the effec…
The electrochemical behavior of Ti-Pd and Ti-6Al-4V alloys in 0.9% NaCl solution were studied by single triangular potential sweep, potentiodynamic polarization curves, and electrochemical impedance spectroscopy techniques (EIS). The complicated corrosion mechanism can be interpreted as at least one electrodissolution…
The results of Raman scattering studies of nanocrystalline CeO2 thin films are presented. The spectra have been described using the spatial correlation model from which the coherence length has been determined as a function of grain size. A direct comparison between the concentration of defects related to coherence le…
We review recent advances in the acquisition and microscopic interpretation of spectroscopic second harmonic data from silicon surfaces, including clean and adsorbate-covered Si(001) in ultrahigh vacuum, and the buried Si/SiO2 interfaces of planar and nanocrystalline structures.
Linear 2,3-di-n-alkoxy-azapolycyclic arenes are shown to act as potent gelators for a variety of organic liquids. This outstanding property is restricted to molecules that have no nitrogen atoms on the 1,4 positions. The readily accessible 5,12-diazatetracenes form thermoreversible gels which do not involve hydrogen b…
Single phase, c -axis oriented thin films of Y-type magnetoplumbite (Ba 2 Co 2 Fe 12 O 22 ; Co 2 Y) with a very large c -axis length as 43.5 Å were grown successfully by pulsed laser deposition technique. The key points were high temperature deposition and the use of CoO buffer layer inserted between the film and MgAl…
X-ray powder diffraction investigation of the new high temperature polymorphs beta- and gamma-CaTeO 3 and gamma- and delta-CaTe 2 O 5 and picnometric measurements of the room temperature phases of the two compounds have been carried out. The study led to the elucidation of their unit cell structures and assignment of…
Research Article| December 01, 2001 Proton microprobe results for the partitioning of platinum-group elements between monosulphide solid solution and sulphide liquid Sarah-Jane Barnes; Sarah-Jane Barnes Sciences de la Terre, Universite du Quebec, Chicoutimi, G7H 2B1, Canada. e-mail: sjbarnes@uqac.uquebec.ca Search for…
This paper describes the effect of fungi on the integrity of posttensioned tendons with respect to the occurrence of stress corrosion cracking (SCC). The occurrence of SCC is interpreted in terms of organic acids produced by fungal metabolic activity.
A new concept of a composite dielectric thin film fabrication is presented. The fabrication process consists of two stages. The first stage is anodizing a thin aluminum film to produce a porous alumina film that contains an array of nanometer sized parallel pores. The second stage is filling the pores with a saturated…
Abstract New copper(II) complexes with 8-hydroxyquinoline-2-carbaldehyde-N-methylnitrone (HL 1 ) (1) and pyridine-2-carbaldehyde-N-methylnitrone (L 2 ) (2) have been synthesized. The crystal structure of compound 1 consists of binuclear molecules Cu 2 (L 1 ) 2 (NO 3 ) 2 with the oxygen atoms of the hydroxy groups acti…
As models of ion channel proteins and naturally occurring pore-forming peptides, we designed a series of Aib rich peptides [Ac-(Aib-Xxx-Aib-Ala)(5)-NH(2) (Xxx = Lys, Glu, Ser, and Gly: BXBA-20)] to investigate the effects of the side chains of the amino acid residues Lys, Glu, Ser, and Gly on the conformation and elec…
On the basis of dielectric investigations of (NH3C2H5)2CuCl4 crystals the existence of phase transitions at T1 = 364 K and T2 = 356 K (in a heating run) was confirmed. In the temperature region of 300–370 K Debye relaxation was observed. The change of the dielectric dispersion character around T3 = 330 K is related to…
Dielectric and ferroelectric properties in systems of permanent and induced dipoles are calculated with a Monte Carlo method, the importance-sampling method. The systems are dipole chains and dipole planes, which can be looked at as subsystems of a perovskite structure. Depending on the system and the parameters we fi…
A influência dos materiais de origem, rochas do Pré-Cambriano e sedimentos coluviais e aluvionares delas derivados, e da posição topográfica na gênese de solos foi estudada em uma toposseqüência representativa das feições geomorfológicas da Baixada Litorânea Fluminense (RJ), no campus da Universidade Federal Rural do…
Interaction of CO 2 , Nd:YAG, excimer and high-power diode laser (HPDL) radiation with the surface of the biomaterial polyethylene (PE), was found to effect varying degrees of change to the wettability characteristics of the material depending upon the laser used. It was observed that interaction with CO 2 , Nd:YAG an…
A comparative study of slow crack propagation in alumina, zirconia and zirconia toughened alumina (ZTA) ceramics is presented keeping in mind the option that ZTA materials offer to improve the lifetime and reliability of ceramic joint prostheses. Different ZTA composites, using either unstabilized or yttria stabilized…