Materials Literature
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Abstract Based on the synthesis of a rigid aromatic diamine, α , α ‐bis(4‐aminophenyl)‐4‐( t‐ butyl)toluene ( 1 ), a novel polyimide (PI) 3 was prepared from this diamine monomer and 4,4′‐oxydiphthalic dianhydride via a one‐step high‐temperature polycondensation. FT‐IR, 1 H NMR and elemental analysis were used to inve…
This work presents an experimental procedure to verify if a model of vector hysteresis, the DPC model (Della Torre, Pinzaglia, Cardelli), based on the Preisach theory, can be identified for a given material. The identification can be achieved only if the material has a magnetic behavior in agreement with the propertie…
We describe here a novel hybrid organic/inorganic nanocomposite of hexahexyloxytriphenylene (HAT6) which is a columnar discotic liquid crystal and gold tetrachloride, an inorganic dopant, showing enhanced dc and ac electrical conductivity by several orders of magnitude at ambient conditions vis-à-vis the respective pu…
The physical principles are considered of on-chip interconnection degeneration and failure in sub-1-µm technologies from the viewpoint of multilevel-metallization reliability. A general theory and simulation results are presented that deal with electromigration-induced failure of thin-film conducting tracks on the mic…
The iron compounds resulting from the impregnation of the most common supports—alumina and silica gel-with an aqueous FeSO 4 · 7H 2 O solution and subsequent heat treatment in air are identified by thermal analysis and Mössbauer spectroscopy. The state of the active component of the iron-containing catalysts depends s…
We investigate the local structural change under antiferro- and ferromagnetic transition for annealed Fe 50.4 Rh 49.6 alloy. Both Fe and Rh K -edge EXAFS are analysed up to second nearest neighbours. For first nearest neighbour Fe-Rh (or Rh-Fe), the temperature dependence of the interatomic distance and Debye-Waller f…
We present results of tight binding calculations demonstrating existence of degenerate electronic shells of Dirac fermions in narrow, charge neutral graphene quantum rings. We predict removal of degeneracy with finite magnetic field. We show, using a combination of tight binding and configuration interaction methods,…
Ground tyre rubber (GTR) was blended with waste polypropylene (WPP) in nine different compositions to prepare GTR/WPP blends. The blends were prepared in a Haake Rheocord PolyLab system at a temperature of 180 °C and a rotor speed of 30 r/min for 8 min. The processing characteristics of the blends showed an increase i…
One of the main reasons for using nonceramic insulators in polluted regions is the reduction of maintenance needed to keep a line in service. Because the useful lifetime of these insulators depends largely on the pollution conditions, it is advisable to inspect the insulators on a regular cycle. The article discusses…
The authors developed an experimental method that can measure the in-plane thermal conductivity of a thin film and the interface thermal conductance between the film and the metal strip, simultaneously. This technique, the in-plane 3ω method, can be applied to the films with very high thermal conductivity such as diam…
Flammability of peroxide vulcanizates of acrylonitrile-butadiene rubber NBR 18, containing various flame retardants has been determined by thermal analysis (Table 1, Fig. 1-5). A clear relation between thermal decomposition rate of cured elastomer and its flammability, determined as oxygen index OI and combustion time…
This study investigates Cu isotope ratio variations in the high-grade, vein-type Cu-Ag deposit of Dikulushi, Democratic Republic of Congo. The Dikulushi deposit consists of a Cu-Pb-Zn-Fe mineralization, comprising sphalerite, chalcopyrite, bornite, and chalcocite that precipitated under reducing conditions. This miner…
This paper presents an experimental study on microstructural and mechanical properties of injection molded microcellular foamed parts. The effects of shot size, injection pressure and mold temperature on the relative density, unfoamed skin thickness, cell population density, surface hardness and flexural strength of v…
Most commercial textile materials are given a “soft finish” for the comfort of the wearer. This paper investigates the effects of two levels of concentration for six commercial softeners on cotton knitted fabrics. The fabric properties are measured by using the Kawabata Evaluation System for Fabrics (KES-FB). It is fo…
The I ( V ) characteristics of amorphous GST devices show a peculiar S-shape behavior, that is a swift rise of the current along with a voltage snap-back. This type of characteristics led to a growing research interest in view of the future application of such materials to the manufacturing of phase-change memory devi…
In situ x-ray absorption spectroscopy identified partially oxidized platinum as the active phase for generating high activity during carbon monoxide oxidation over Pt/Al 2 O 3 . CO covers and poisons metallic platinum, which results in a low catalytic activity. The conversion in CO abruptly increased during ignition,…
This paper presents a program to simulate performance of a liquid phase catalytic exchange (LPCE) column of a water detritiation facility based on combined electrolysis and catalytic exchange (CECE) technology over a wide range of deuterium contents in a feed stream. The program uses rate constants of the chemical iso…
Cation Exchange Selectivity (CES) for Wyoming montmorillonite was determined by equilibration of the clay with a mixed equinormal solution containing two competing cations (i.e. Pb2+, Zn2+). This paper aims at characterizing the structural change and selectivity of a Na-dioctahedral smectite (Wy-Na). The quantitative…
X-ray absorption fine structure (XAFS) and first-principles calculations are effectively combined to establish correlations of fabrications, atomic and electronic structures as well as ferromagnetism for the Mn-doped dilute magnetic semiconductors (DMS), and to shed light on the magnetism origin for a variety of ZnO-,…
The focus of this study has been to fully describe the mechanical properties and behaviour of an extruded Wood Plastic Composite product. The use of plasturgy technologies for the elaboration of lignocellulose reinforced composites raises fundamental questions about the behaviour of these materials. Mechanical propert…