Materials Literature
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Some aspects of electrochromism phenomena are presented in this review paper.A deep literature revision about the subject dealing with materials and device configurations developed in the last years, is presented.Great efforts of the scientific community have been done in this field.On the other hand, new electrochomi…
Austempered ductile iron (ADI) is gradually replacing many fabricated and forged steel components in engineering applications. One of its advantages is the combination of good castability, machinability, and mechanical properties with significant savings in cost and weight compared with equivalent steel components. A…
Branched poly(ethylene terephthalate)s (BPET) of varying molar mass have been synthesized with glycerol and pentaerythritol as branching comonomers, and their rheological behaviour has been measured. In this study, we describe the use of dynamic and steady shear measurements to examine the influence of the proportion…
Three protected catechol-containing conjugated oligomers have been prepared using Pd-mediated coupling reactions. Two of the oligomers are poly[ o -phenylenevinylene] type while the other is poly[ o -phenyleneethynylene] type. One of the poly[ o -phenylenevinylene]-type oligomers is regioregular while the other is reg…
A silica (SiO 2 ) layer was deposited on the surface of an AlN ceramic in order to increase the strength and to prevent the high‐temperature oxidation of the material. The layer was formed on the surface by exposing coupons to the atmosphere downstream of a bed of SiC powder in a flowing H 2 –0.1% H 2 O atmosphere at…
Magnetic ion spin dynamics has been investigated in the perovskite manganite ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ single crystals at the hole concentrations x of 0.5 and 0.55 by muon spin relaxation $({\ensuremath{\mu}}^{+}\mathrm{SR})$ spectroscopy. We have observed the critical slowi…
The main problem with Shape Memory Alloy (SMA) actuators is their slow response speed. Current SMA actuators work in tens of seconds though they can generate large force and displacement outputs. The objective of the research in this paper is to improve the response speed of SMA actuators to 10 milliseconds or less. S…
Raman spectra of ${\mathrm{SrZrO}}_{3}$ have been successfully obtained at temperatures from $600\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ to $1240\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ by using a new continuous-wave ultraviolet Raman spectroscopic system. The phase transition between cubic and tetragonal…
Cupronickel alloys have been extensively used in marine and offshore applications. These alloys offer desirable physical and mechanical properties to be used as a versatile engineering alloy. The oxidation resistance of these alloys was due to the formation of scales consisting of a thick, inner Cu2O layer and a thin,…
The assessment of fiber scale height is known to be a key ingredient in animal fiber analysis, particularly when quantifying speciality fiber/wool blends. This paper ex plores the potential role of imaging techniques in scale height measurement. High magnification fiber images are captured from a SEM, and imaging tech…
The dynamic mechanical response of several binary mixtures of a styrene–butadiene copolymer and high cis-polybutadiene has been studied. The loss tangent and shear modulus were measured with a free damping torsion pendulum at temperatures between 143 and 343 K in argon atmosphere. From the loss tangent data the glass…
Heat treatment of graphitized and ungraphitized carbon samples was carried out in air and argon atmosphere from ambient temperature to 700\\circC. The changes in degree of amorphousness, mean crystallite size and interlayer separations were studied employing x-ray diffraction. The results revealed an increase in cryst…
A predictive scheme is proposed for the simultaneous calculation of the modulus and yield (or tensile) strength of ternary polymer systems. According to the continuity or discontinuity of constituting phases, the scheme combines in two steps the models for binary systems: (i) in the interval of phase duality (co-conti…
The thin sheets of calcite, termed folia, that make up much of the shell of an oyster are covered by a layer of discrete globules that has been proposed to consist of agglomerations of protein and mineral. Foliar fragments, treated at 475 degrees C for 36 h to remove organic matter, were imaged by atomic force microsc…
The electronic excitation energies of boron nitride in the layered hexagonal (h-BN), zincblende (c-BN), and wurtzite (w-BN) structures under applied pressure and lattice stretching have been studied. Hydrostatic pressure applied on denser phases c-BN and w-BN has been considered, on the other hand for h-BN both hydros…
The metastable pitting behaviour of galvanically coupled and potentiostatically controlled A516–70 carbon steel in a chloride containing solution has been statistically analysed. It is shown that the pitting activity, indicated by the pit initiation rate, depends on immersion time, applied potential, and chloride conc…
Abstract The intercalation complex of a low-defect (“well-crystallized”) kaolinite from Cornwall, England, with hydrazine was studied by high-temperature X-ray diffraction (HTXRD), differential thermal analysis (DTA), and thermogravimetry (TG). The X-ray pattern at room temperature indicated that intercalation of hydr…
Abstract The rheological properties of calcium carbonate‐filled polypropylene were examined using a Rheometrics dynamic analyzer. The study included steady shear test, transient stress growth test with sequential deformation history, and two‐step dynamic oscillatory shear flow. Thixotropic behavior was observed in tra…
Unusual large magnetostrictions as well as anisotropy compensation have been found in quaternary ${\mathrm{Sm}}_{0.9}{\mathrm{Pr}}_{0.1}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{)}_{2}.$ The magnetostriction constants ${\ensuremath{\lambda}}_{111}$ and ${\ensuremath{\lambda}}_{100}$ at room temperature are $\…
The bulk polymerisation of ε-caprolactone initiated by tetrapropoxy titanium was investigated in a co-rotating twin screw extruder. The process dynamic modelling, based on pressure measurements, was achieved via a combination of rheological modelling coupled with residence time distribution modelling. The former was d…