Materials Literature
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We investigate the electronic characteristics and the absorption spectra of poly(3-octylthiophene), POT, films grown by electrochemical methods onto Au substrates. We discuss the results considering the morphological factor. POT films thickness can be controlled by current density in the electropolymerization process.…
The microstructures of as-cast and slowly solidified Al-Cu-Fe ternary alloys in the vicinity of the icosahedral phase region have been investigated using light microscopy and scanning electron microscopy. The chemical composition of the different phases present has been determined by energy-dispersive X-ray spectrosco…
A cosmetic patch containing tamarind fruit extract was formulated and developed by blending two types of natural polymers: chitosan with molecular weight of 100 000 and starch such as corn, potato or tapioca starch. The physicochemical characteristics, i.e. flexibility, colour, transparency, integrity, gloss, water so…
A solution to the equation of grain-boundary diffusion is obtained under conditions where migration of the diffusant from the boundaries into the grains is absent and the diffusion coefficient decreases with time from an increased value to a value characteristic of equilibrium grain boundaries. The specific features o…
The displacement cross-section of iron was calculated for gamma-ray irradiation with the energy range of 1 to 15 MeV, which corresponds to radiation fields in fission reactors. Three gamma-material interactions, Compton scattering, pair production and photoelectric effect were considered. The displacements induced by…
The inhibitive action of triazoles and surfactants on the corrosion of carbon steel has been studied using the weight loss method and electrochemical studies. Results obtained show that these organic compounds are very good inhibitors. Potentiodynamic polarisation studies clearly reveal the type of inhibitor. The corr…
Abstract [DodMe 2 S] 2 AgI 3 and [DodMe 2 S]Ag 2 I 3 were obtained from mixtures of dodecyldimethylsulfonium iodide and silver iodide in acetonitrile solution. [DodMe 2 S] 2 AgI 3 crystallizes in the orthorhombic crystal system, space group Pbca and contains trigonal planar anions AgI 3 2− , while [DodMe 2 S]Ag 2 I 3…
Abstract Two biphenyl lignans, α ‐ and β ‐DDB ( 1 and 2 , respectively) were efficiently synthesized without contamination by other regio‐isomers. The different yields of the Ullmann coupling reactions for the synthesis of 1 and 2 were rationalized by calculating steric hindrance, stability, entropy change, and heat‐o…
The inhibition efficiency (IE) of various concentrations of a caffeine-Zn2+ system in controlling corrosion of mild steel immersed in an aqueous solution containing 60 ppm of Cl– was evaluated by a weight-loss study. The formulation consisting of 50 ppm of caffeine and 50 ppm of Zn2+ showed 91% IE. A synergistic effec…
In this work, the frequency relaxation of the dielectric permittivity of BaBi 2 Ta 2 O 9 (BBT) and BaBi 2 Nb 2 O 9 (BBN) ceramics is investigated in the wide temperature range. Both compositions feature behavior typical for relaxor ferroelectrics including the strong frequency dispersion of the permittivity, the prono…
Abstract The hydrothermal reaction of kaolinite in the system Na 2 O-K 2 O-(MgO)-Al 2 O 3 -SiO 2 - H 2 O has been investigated at 200 and 300 º C. The study of the solid products indicates that, at 200 º C, disordered illite was the first phase formed, which evolved at increasing run times towards well ordered illite…
Abstract Morphology and properties of poly(butylene terephthalate) (PBT)/nylon 6 (PA6)/EVA‐g‐MAH ternary blends were investigated. The blends were prepared in a corotating, intermeshing, twin‐screw extruder. The incorporation of maleic anhyride (MAH) grafted onto ethylene‐vinyl acetate copolymer (EVA) (EVA‐g‐MAH) in t…
Las muestras palinológicas de sedimentos holocenos provenientes de la laguna Hinojales (37º 34’" S; 57º 27’O), sudeste de la provincia de Buenos Aires, contienen algas (Chlorophyta, Cyanophyta and Dinoflagellata) y acritarcos. Las algas clorofíceas consisten en cenobios de Pediastrum musterii Tell y Mataloni,P. boryan…
Internal space charge measurement has been mainly applied to investigate insulating materials used in RV apparatus, such as HVDC cables. We have observed the space charge profiles to monitor copper ion migration occurring in an insulation layer of a metal-base printed circuit board and found that the space charge dist…
Abstract Aggregation of colloidal clay particles (Na-montmorillonite) by CaCl 2 and anionic polysaccharide (succinoglycan) in turbulent conditions was investigated using time-resolved size measurements by laser diffraction on diluted (50 mg l –1 ) and stirred suspensions. Excess of Ca 2+ ions promotes coagulation of t…
Abstract Raman spectrometry, UV–visible–near IR and attenuated total reflection IR absorptions are used to analyze the protonation of the emeraldine form of the phenyl/—NH 2 end‐capped BQBBa tetramer and of the phenyl/—NH 2 end‐capped (BQBB) 4 a hexadecamere in strong (H 2 SO 4 or HCl), intermediate (CH 3 COOH) and we…
Porous SiC ceramics were synthesized by sintering pressed and pressed/CIPed powder compacts of α‐Si 3 N 4 , carbon (Si 3 N 4 :C = 1:3 mol as ratio), and sintering aids, at 1600°C for few hours to achieve a reaction, and subsequently sintering at a temperature range of 1750°–1900°C, in an argon atmosphere. High porosit…
Improved X-ray powder diffraction data for orthorhombic phosphorus, S.G. C mca (64) obtained in situ at synthesis conditions of 1.2 GPa and 1100 K, are described. Representative, as synthesized, data include 2.552 X , 3.320 4 , 2.595 3 , 5.191 2 , 1.630 2 , for least-squares unit-cell a =3.3182(6) Å, b =10.3744(18) Å…
Copper and palladium complexes of new salicylaldimines derived from 3,4,5-tridecyloxyaniline, 2,3,4-tridecyloxyaniline and 4-decyloxyaniline have been synthesized and characterized. All the ligands bear four or more aliphatic chains with the aim of inducing columnar mesophases at low temperatures. In particular, metal…
We describe a new and unique method for simultaneous determination of the groove depth and duty cycle of binary diffraction gratings. For a near-normal angle of incidence, the +1 and -1 diffracted orders will behave nearly the same as the duty cycle is varied for a fixed grating depth. The difference in their behavior…