Materials Literature
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Abstract In Part 1 of this contribution we have reported how the Flory‐Huggins interaction parameter χ can be modeled as a function of chain length within the composition range of pair interaction between the macromolecules by means of the three parameters α , ζ , and λ . This contribution presents the extension of th…
TiO2 is frequently used in optical coatings as an inexpensive material with a particularly high refractive index. Often this high refractive index is only achieved if the substrate is heated to enable the deposition of crystalline films with rutile structure. In this study titanium oxide films have been deposited by d…
Abstract A large number of outstanding physical properties observed in perovskite‐type oxides, such as giant piezoelectricity, colossal magneto‐resistance and high‐ T c superconductivity, are related to an intrinsic nano‐scaled local structure. For instance, the presence of a nano‐scaled structure is characteristic of…
Abstract The background of several electrochemical techniques – recording of the corrosion potential E corr , electrochemical impedance spectroscopy (EIS), electrochemical noise analysis (ENA) and recording of potentiodynamic polarization curves – has been discussed and examples of the use of these techniques in studi…
Shikimate dehydrogenase catalyzes the NADPH-dependent reversible reduction of 3-dehydroshikimate to shikimate. We report the first X-ray structure of shikimate dehydrogenase from Haemophilus influenzae to 2.4-A resolution and its complex with NADPH to 1.95-A resolution. The molecule contains two domains, a catalytic d…
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The synthesis of magnesium silicon nitride (MgSiN 2 ) by direct nitridation of a Si/Mg 2 Si/Mg/Si 3 N 4 powder mixture is described. A nucleation period at 550°C and stepwise heat‐treatment schedule up to 1350°C was adopted for the synthesis of MgSiN 2 powder, based on TG‐DTA measurements. The influence of the ratio o…
We report high-precision reflectance, $R(\ensuremath{\omega}),$ measurements on films of conducting polypyrrole oriented by tensile drawing. The results obtained from Kramers-Kronig analysis of $R(\ensuremath{\omega})$ demonstrate that the optical conductivity, \ensuremath{\sigma}(\ensuremath{\omega}), becomes frequen…
This article summarizes two recently developed patterning techniques for plastic electronics: microcontact printing and thermal transfer printing. It reviews the methods and their capabilities, and presents new results on their use in forming transistors and circuits with a range of organic semiconductors. Active matr…
Experiments were conducted on the Zn-22 wt% Al eutectoid that contained nanometre-scale dispersion particles. These particles were introduced in the matrix of the alloy via powder metallurgy followed by cryomilling. Transmission electron microscopy observations made on specimens crept at a strain rate near the centre…
Recycling of rubber waste poses a challenging environmental, economical, and social problem. In the present study, we propose a new two-stage recycling process to reuse a rubber waste. First, the granulates of the waste were pulverized into small particles using a single screw extruder in the Solid State Shear Extrusi…
The ordering of Al 3+ , Fe 3+ , and Mg 2+ cations along the octahedral sheet in dioctahedral 2:1 phyllosilicates was studied theoretically. The distribution of Fe 3+ /Mg 2+ was studied in the octahedral sheet and is compared with the Al 3+ /Fe 3+ and Al 3+ /Mg 2+ distributions. The cation exchange interaction paramete…
Single‐phase in situ toughened SiAlON ceramics containing various modifying cations and single‐crystal seeds were studied. The modifying cations include rare‐earth cations from the smallest to the largest allowed in the α‐SiAlON structure (Yb to Y, to Nd), and from monovalent to trivalent (Li to Ca, to rare earths). A…
The influence of amide ligands on the photoluminescent behavior of tris(thenoyltrifluoroacetonate)- europium(III) in the solid state is reported. Elemental analysis showed that these compounds have the following formulas [Eu(TTA)3·(ANL)2] and [Eu(TTA)3·PZA], where ANL = acetanilide and PZA = pyrazinamide. The photolum…
This paper describes a modeling approach to incorporate the effects of nonquasistatic loading on the extensional behavior of an SMA wire. Experimental results under a variety of loading conditions indicate that the instantaneous temperature of the material is closely related to the applied strainrate in the material.…
Novel functionalized bis(ethylenedithio)tetrathiafulvalene (BEDT–TTF) derivatives 4 and 5 have been synthesized in good yields from cyano precursor via a cross-coupling reaction. Their redox potentials have been studied by cyclic voltammetry in a dichloromethane solution; this indicated that they are slightly weaker e…
We investigate the slow dynamics in gelling systems by means of Monte Carlo simulations on the cubic lattice of a minimal statistical mechanics model. By opportunely varying some model parameter we are able to describe a crossover from the chemical gelation behaviour to dynamics more typical of colloidal systems. The…
The cubic titanosiloxane [RSiO(3)Ti(OPr(i))](4) (R = 2,6-Pr(2)(i)C(6)H(3)NSiMe(3)) (1) is found to be relatively inert in its attempted reactions with alcohols and other acidic hydrogen containing compounds. The reaction of 1 with silanol (Bu(t)O)(3)SiOH however proceeds over a period of approximately 3 months to resu…
The concept of polymerization-induced phase separation with hydrogen-bonded supramolecular polymers was investigated by the photopolymerization of films containing mixtures of supramolecular polymer 1a or 1b and varying amounts of monoacrylate and diacrylate with UV-A (320−400 nm) radiation (5 W/cm 2 ) for 0.3 s. The…
The cavitation corrosion behavior of 20SiMn low-alloy steel in both distilled water and 3% sodium chloride (NaCl) solution was investigated using a magnetostrictive-induced cavitation facility. The micrographs of damaged surfaces were observed with a scanning electron microscope (SEM). The role of corrosion was analyz…