Materials Literature
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In a junction system which consists of ferromagnetic- (La1−xSrx)MnO3 and band insulating-SrTiO3, the double exchange ferromagnetism in the (La, Sr)MnO3 layer was controlled by light irradiation through photocarrier injection form SrTiO3. We investigated the dependence of hole doping level (Curie temperature) on the ph…
La 0.8 Sr 0.2 Cr 0.9 Ti 0.1 O 3 perovskite has been designed as an interconnect material in high‐temperature solid oxide fuel cells (SOFCs) because of its thermal expansion compatibility in both oxidizing and reducing atmospheres. La 0.8 Sr 0.2 Cr 0.9 Ti 0.1 O 3 shows a single phase with a hexagonal unit cell of a = 5…
The synthesis of calcium hexaboride (CaB 6 ) powder via the reaction of calcium carbonate (CaCO 3 ) with boron carbide (B 4 C) and carbon has been investigated systematically in the present study. The influences of heating temperature and holding time on the reaction products have been studied using X‐ray diffractomet…
Associations of diatom species were identified, in the Arroio Sampaio Basin, Rio Grande do Sul, Brazil, based on monthly samplings over a year along Arroio Sampaio and its main tributaries, using polyamide thread as an artificial substrate. The species groupings showed four different environments: medium-lower course…
Rather than a marriage of convenience, which implies a relationship that is non-rigorous and has a substantial degree of independence, we argue that as we move forward through the 21st Century, studies on the taxonomy and ecology of freshwater diatoms will, and by necessity must, be linked. This linkage will be forged…
Abstract There is increased technological interest to use blends of various dissimilar elastomers in applications for which service, material availability, or cost of a single elastomer do not provide the necessary processing, vulcanizate, or economic properties. Properties of polyblends are sensitive to variations in…
Polyurethane closed cell rigid foams have been widely used as insulants in the building and refrigeration industry and also for district heating pipes. It is the special combination of its excellent insulation performance and the mechanical stability due to the foaming process which makes this material very attractive…
The adhesive interphase formed between brass plated steel cord and sulfur crosslinked rubber is known to be a complex layer of metal oxides, sulfides, and rubber. Hostile aging of this system produces changes in the structure, morphology, thickness, and mechanical properties of this layer. In a previous publication it…
The results of the low-temperature ultrahigh-energy-resolution photoemission studies of a single-grain icosahedral alloy ${\mathrm{Al}}_{70}{\mathrm{Pd}}_{21.5}{\mathrm{Mn}}_{8.5}$ have been presented. The existence of the theoretically predicted pseudogap in the density of states at the Fermi energy has been confirme…
PET waste obtained from beverage bottles was depolymerized by a glycolysis reaction, using diethylene glycol (DEG) as the glycolyzing system and manganese acetate as a transesterification catalyst. The glycolysis reaction was conducted at two different molar ratios of PET : DEG, namely 1 : 2.15 and 1 : 1.03, for the s…
Starch applications in the plastics industry have been investigated intensively for many years. Unfortunately, native starch is unsuitable for most applications in polymers, because of its hydrophilic and brittle character. Modification of native starch can be a solution of this problem. In our research programme we d…
Nanomaterials have contributed significantly to the enhancement of technological and industrial development. The conventional membranes used in various separation processes are limited in their abilities, performances, and are prone to fouling or biofouling. Membranes fabricated with functionalized nanomaterials are s…
The late-stage phase ordering, in d = 2 dimensions, of symmetric fluid mixtures violates dynamical scaling. We show however that, even at 50/50 volume fractions, if an asymmetric droplet morphology is initially present then this sustains itself, throughout the viscous hydrodynamic regime, by a "coalescence-induced coa…
The phase transformation behavior of hexagonal germanium nitride, including both α- and β-Ge3N4, has been studied under shock wave compression. The shock compressed quenched samples indicate phase transformation from hexagonal into a cubic spinel structure (γ-Ge3N4). This transformation is completed with increasing sh…
Composites of jute fabrics (Hessian cloth) and Biopol® were prepared by compression molding process. Three types of Biopol® (3-hydroxbutyrate- co-3-hydroxyvalarate) such as D300G, D400G and D600G, depending on the concentration of 3-hydroxyvalarate (3HV) in 3-hydroxbutyrate (3HB) were taken for this purpose. Mechanica…
Recent advances in the development of organic multifunctional spin systems are described. This includes systems with carrier transport properties, photo-functionality, liquid crystallinity, and pressure functionality in which aminoxyl (nitroxide) radicals play a crucial roll.
A new soluble terephthaloyl oligoperoxide (OTP) was synthesized by the reaction of terephthaloyl peroxide and 2,5-dimethyl 2,5-dihydroperoxy hexane. Thermal polymerization of vinyl monomers (styrene, methyl methacrylate) with OTP yielded poly(styrene peroxide) (PS-P) and poly(methyl methacrylate peroxide) (PMMA-P) whi…
Physico-chemical properties of retentates obtained from selective concentration of skim milk up to 8 times its original weight using a microfiltration system were studied. The effects of process variables, namely concentration (8.6 to 27 wt.%), temperature (20 to 50 degrees C) and pH (6.0, 6.3, and 6.5) on density (rh…
A stress intensity ( K ) function describing the extension of a crack through bounding compressive layers has been experimentally verified using two methods. For one method the crack length was measured using a replicating technique; in the other, the crack length was continuously measured in situ with an optical micr…
The aims of the present study were to prepare spray-dried polymeric nanocapsules (NC) and nanospheres (NS) from poly(epsilon-caprolactone) (P epsilon C) suspensions containing diclofenac (DIC) and to determine the physicochemical properties of the formulations. NC or NS suspensions were prepared by interfacial deposit…