Materials Literature
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<abstract language="eng">Polyhydroxyalkanoates (PHAs) are carbon and energy storage materials that are accumulated as intracellular granules in a variety of microorganisms during unbalanced growth. PHAs have drawn attention due to their properties similar to conventional plastics and complete biodegradability. T…
The temperature dependence of the solid-state magnetic susceptibility for the paramagnetic V(I) complexes trans -(CpV) 2 (μ-η 6:η 6 -C 6 H 6 ) ( 1 ) and CpV(η 6 -C 6 H 6 ) ( 2 ) has been investigated. Complex 1 obeys the Curie−Weiss law over the temperature range 10−300 K with μ eff = 4.81 μ B and ϑ = −18.8 K. The hig…
Abstract The macromolecular engineering of aliphatic polyesters by ring‐opening polymerization (ROP) initiated by aluminum alkoxides is now well established. Tin (IV) alkoxides are less popular, mainly because of a poorer control of the chain growth. This paper discusses some recent examples from CERM, showing that ti…
Ceria (CeO 2 ) aerogels with high surface area and high porosity have been prepared. Ce‐methoxyethoxide diluted in excess methoxyethanol was slowly hydrolyzed to yield a gel, which was then supercritically dried in CO 2 . Both as‐synthesized and annealed aerogels were examined by X‐ray powder diffraction, infrared spe…
It has been found that nanostructured organic/inorganic composites, in which nanometer-sized inorganic inclusions are uniformly dispersed in and fixed to a matrix polymer, can modify the property of the matrix polymer while suppressing Rayleigh scattering to exhibit preferable transparency. Rather, when compared with…
Abstract The surface of the oxide layers formed after oxidation in air at 750°C of three titanium alloys has been characterized by several techniques. The investigated alloys were Ti7Nb6Al, Ti13Nb13Zr and Ti15Zr4Nb, with potential applications as biomaterials. XPS experiments showed that, after 24 h exposure, th…
Several models for the estimation of thermodynamic properties of layered double hydroxides (LDHs) are presented. The predicted thermodynamic quantities calculated by the proposed models agree with experimental thermodynamic data. A thermodynamic study of the anion exchange process on LDHs is also made using the descri…
Abstract The effects of ultrasonic irradiation on the mechanical properties, morphology, and crystal structure of polypropylene (PP)/ethylene‐propylene‐diene terpolymer (EPDM) blends were examined. Results show that appropriate irradiation intensity can noticeably increase the toughness of the PP/EPDM blends without r…
A crude plasmin extract was prepared from milk by ultracentrifugation and was partially purified using ammonium sulfate precipitation. Isothermal and high-pressure inactivation of this plasmin system at pH 6.7 could be described by a first-order kinetic model. As expected, the plasmin system displayed a high thermosta…
Abstract Polyamide‐6,6 (PA)/poly(ethylene terephthalate) (PET) blends were obtained by direct injection molding over the whole composition range. Besides the two crystalline phases, the blends were composed of a pure amorphous PET phase, and a probably pure PA amorphous phase. The crystallinity of PA and PET did not c…
Samples of interstitial free (IF) steel were heated in alumina–graphite crucibles with flux cover at 1600°C for 120 min in a medium frequency induction furnace. The carbon contents of IF steel samples taken from the molten steel at times 0, 5, 10, 20, 30, 45, 60, 90 and 120 min were examined and the refractories after…
Abstract. Poly (ethylene terephthalate)-organoclay nanocomposites were prepared via melt blending in a torque rheometer at several different clay concentrations (3; 5; 8 and 16 wt.%). Morphological and thermal properties of the nanocomposites were characterized by x-ray diffraction (XRD), transmission electron microsc…
For a compound to be classified as a volatile corrosion inhibitor (VCI), it must possess two basic properties: volatility and ability of the vapour to retard the corrosion rate. VCIs can be used in cases where other protection methods are not feasible or when protection could be very expensive. Usually, most organic c…
Abstract The thermodynamic properties of Zn13La were investigated by calorimetry. The standard entropy of formation at 298 K, ΔfS°298, was determined from measuring the heat capacities, Cp, from near absolute zero (2 K) to 300 K by the relaxation method. The standard enthalpy of formation at 298 K, ΔfH°298, was determ…
ZnO nanoparticles were prepared by a solid state pyrolysis reaction of zinc acetate dihydrate and oxalic acid dihydrate at 500°C. The course of reaction at various temperatures was followed by XRD. Subsequently varistors were fabricated from this nano-ZnO material by solid state mixing with various oxide additives and…
Abstract Magnesium–aluminum layered double hydroxide containing polysulfide anions was prepared by a hydrothermal reaction from magnesium and aluminum hydroxides. Thioacetamide was used as the sulfide source. The product exhibits light green color corresponding to the S2− and S3− ions and turns to colorless when the s…
An approach for the classification of cavity sizes based on their maximum charge transfer characteristics, applied voltage partial discharge pattern using Hidden Markov Models, is described. In these models, the partial discharge patterns for different cavity sizes are represented by a sequence of events rather than b…
Abstract Effects of bamboo fiber (BF)-esterified with maleic anhydride (MA) (BF-e-MA) on the properties of BF-filled poly(butylene succinate) (PBS) bio-composites were investigated. Adding 5% BF-e-MA increased the tensile strength of the PBS/BF (70/30) composite from 21 MPa to 28 MPa in the presence of radical initiat…
The effect of Sn substitution on the dielectric and piezoelectric properties of BiScO 3 –PbTiO 3 was investigated in the ternary system, (1- x ){(1- y )BiScO 3 – y PbO·SnO 2 }– x PbTiO 3 ( x =0.43–0.63, y =0.25–0.75). The ferroelectric phase transition temperature near morphotropic phase boundary (MPB) decreased with…
The crystal structure of annealed chevkinite-(Ce), ideally (REE,Ca)(4) Fe2+ (Ti,Fe3+,Nb)(4) Si-4 O-22, monoclinic, C2/m, crystal (2(an)) a 13.400(1), b 5.7232(4), c 11.0573(9) Angstrom, beta 100.537(2)degrees, V 833.7(2) Angstrom(3) and crystal (3(an)) a 13.368(2), b 5.7243(6), c 11.041 (1) Angstrom, beta 100.516(1)de…