Materials Literature
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Single-crystal samples of taurine, NH3C2H4SO3, were studied by Raman spectroscopy in a diamond-anvil cell up to pressures of 5.6 GPa. From the analysis of the results we observed that the crystal undergoes a phase transition at about 0.7 GPa. The transition is accompanied by the appearance of a phonon in the external…
The polytopic ligands 2poap and po2p have a linear disposition of coordination pockets suitably disposed to bind metal ions in close proximity and produce linear trinuclear copper(II) complexes. The complexes [Cu3(2poap − 2H)(CH3CO2)4]·3H2O (1), [Cu3(2poap − 2H)(H2O)(DMF)3(CH3OH)2](BF4)4 (2), and [Cu3(po2p − H)2(H2O)2…
At a polymer-solid interface, an inorganic adherend may influence the structure and/or chemistry of the polymer in the near-interface region. This region between the adherend and the homogeneous polymer is referred to as the interphase. While there is general agreement that interphases exist, extensive debate revolves…
Grain refining mechanisms of Fe– and Mn–free high-purity Mg–Al alloy ingots and the influences of a small addition of Fe or Mn on their cast structures were investigated. In order to prepare the alloy, a distilled pure magnesium (< 99.99%) and a commercial high-purity aluminum (99.99%) were melted, and given amounts o…
The power absorption of Co-rich metallic glasses in the shape of ribbons and microwires has been measured in the microwave frequency range. The technique employed consists of replacing the dielectric of a coaxial transmission line by the amorphous sample to be measured. The ferromagnetic resonance frequency of the mic…
The first push–pull 1,3-dithiol-2-ylidene derivatives containing an azine spacer have been prepared in order to evaluate the effect of the azine bridge on the second-order NLO properties of these compounds, which show µβ(0) values lower than those of similar derivatives endowed with ethylenic spacers. The linear and n…
The reaction of 3-aminophenylhydroxamic acid with CuSO4·5H2O in aqueous solution gives the novel helical polymer [Cu3(3-Apha)4(H2O)SO4]n·8H2O 1 the structure of which contains interlinked repeating units having three unique neutral, anionic and cationic copper(II) sites. In this complex the copper(II) sites are magnet…
This article describes electrically conductive polymer blends containing polyaniline-dodecyl benzene sulfonic acid (PANI-DBSA) dispersed in a polystyrene (PS) matrix or in crosslinked polystyrene (XPS). Melt blending of previously mixed, coagulated, and dried aqueous dispersions of PANI-DBSA and PS latices lead to hig…
The reaction course leading to meso-substituted porphyrins was examined for reversibility (formation of oligomers, formation of α- and β-pyrrole linkages), inactivation of the acid catalyst, homogeneity of the reaction medium, and the pathway of oligomer formation. The methodology employed enabled characterization of…
We have used several experimental methods to study how a large extrinsic oxygen vacancy density in pure tetragonal ZrO 2 powders depends on details of how those powders are made. Samples were made from oxychloride and nitrate precursor solutions. We used perturbed angular correlation spectroscopy to determine in situ…
The thermal diffusivity and specific heat have been measured at room temperature by laser flash method and AC calorimetry, respectively. Thermal conductivity has been determined by the product of density, thermal diffusivity and specific heat. The Debye temperature data have been collected from the measurements of ult…
Corn-zein is a protein polymer promising as a biodegradable food packaging film to overcome environmental pollution caused by the use of non-degradable petroleum-derived plastics. However, the brittleness of pure zein film requires that plasticizers be added. The effects of the proportion of polyethylene glycol (PEG)…
This paper describes the synthesis, electrochemistry, and electronic properties of 5,5′-di(2-thienyl)-2,2′-bithiazole, 5,5′-di(2-thienyl)-4,4′-dimethyl-2,2′-bithiazole, and 5,5′-bis(3-methoxy-2-thienyl)-4,4′-dimethyl-2,2′-bithiazole, their complexes with Ru(bpy)22+ and Os(bpy)22+, and electrochemically prepared polyme…
This paper deals with the bonding of sulfur-vulcanized rubber compounds to metals. It had previously been reported that bis-(triethoxysilyl)ethane and vinyltriethoxysilane were found to work for bonding peroxide-cured rubber compounds to metals. These silanes were found not to work with sulfur-cured rubber compounds.…
The nonallosteric and allosteric L-lactate dehydrogenases of Lactobacillus pentosus and L. casei, respectively, exhibited broad substrate specificities, giving virtually the same maximal reaction velocity and substrate K(m) values for pyruvate and oxaloacetate. Replacement of Pro101 with Asn reduced the activity of th…
The combination of bpa with the pseudohalide cyanate (NCO−) leads to the preparation of two new isomorphous compounds exhibiting the formula [M(NCO)2(bpa)2]n·bpa where M = Co (1), Mn (2). Both of them have been magnetostructurally characterised by means of X-ray diffraction analysis, TG measurements, IR and ESR spectr…
The goal of this work was to test for the occurrence of the (IR) voltage form of crevice corrosion in a corrosion-resistant alloy. Crevice corrosion occurred immediately (prior to a change in the solution composition) in alloy T-2205 duplex stainless steel exposed to an acidic-chloride media. This was indicated by the…
Hydrogen absorbed from the test environment was detected experimentally from an Al–4.9%Zn–2.2%Mg–1.3%Cu alloy deformed in laboratory air, which is a direct evidence of hydrogen embrittlement. The alloy exhibited grain boundary embrittlement when deformed at a strain rate of 10−7 s−1 in laboratory air and hydrogen beha…
The crystals of ferroelectric-semiconductor Sn2P2S6 exhibit a strong piezoelectric effect. We present measurements of ultrasonic and piezoelectric properties of other crystals of the Sn2P2S6 family: i.e., Sn2P2Se6 and CuInP2S6. The acoustoelectric method was applied to measure electromechanical coupling parameters in…
Poly(2,3,5,6-tetrafluoro-1,4-phenylenevinylene) (PTFPV) was prepared for the first time by the Stille cross-coupling reaction and the resulting material was characterized through MALDI-TOF mass spectrometry, employing a novel sample preparation protocol suitable for insoluble compounds; preliminary optical and electro…