Materials Literature
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Reaction of the verdazyl precursor 1,4,5,6-tetrahydro-2,4-dimethyl-6-(2′-pyridyl)-1,2,4,5-tetrazin-3(2H)-one (pvdH3) with oxygen and copper(I) bromide in acetonitrile results in precipitation of the crystalline diradical di-μ-bromo-bis[(1,5-dimethyl-6-oxo-3-(2-pyridyl)verdazyl)copper(I)]. The solid shows a slightly an…
The aim of the present work is to focus on the characterization of materials in situ by using a modified near‐field scanning optical microscope (NSOM) with a home‐built tuning fork head that allowed us to obtain optical imaging concurrently with topography of some systems. The first example is related to finding precu…
This paper compares a dibromo and a structurally strictly related diiodo monomer in regard to the respective achievable molecular weights and the degree of incorporated phosphorus when subjected to the Suzuki polycondensation. The diiodo monomer gives – by a factor of roughly two – a higher molecular weight PPP (Pn up…
The evaluation of the ampacity of electric power cables and the overload protection are currently based on criteria, to which the operation of the circuits will have to satisfy each time like the first time, without self-memory of the way of life, without discounts or debts correspondent to the actual profile load, ce…
( Ce 0.83 Sm 0.17 ) 1 − x Zr x O 2 − δ ( x = 0 to 0.50 ) solid solutions were synthesized for the first time by the hydrothermal method. The electrical properties of the solid solutions have been studied in air and under reducing conditions. Solid solutions with the fluorite structure were formed in all of the studied…
Relaxor-type ferroelectric perovskites, (1-x)PNN · xPT, were prepared through process of heat treatment and then acid treatment of oxide mixtures containing PbO in amount greater than in the perovskite composition. For obtaining the perovskites without formation of pyrochlore phase, it was essential that the amount of…
Tris(2,2′-bipyridine)Zn(II) tetrakis(2-chloro-4-nitrophenolate)Zn(II), [Zn(bpy)3][Zn(CNP)4] 1, is a new octupolar material for quadratic nonlinear optics. 1, a chiral metal–organic complex, crystallizes in space group C2. Refinement of the Flack parameter supports the description of the [Zn(bpy)3]2+ cation as the Δ en…
The objective of this research is to understand the effects of crack tip mechanics on environment‐assisted cracking (EAC) of α‐precipitation hardened β‐Ti alloys. Precracked Ti–8V–6Cr–4Mo–4Zr–3Al and Ti–15Mo–3Nb–3Al are prone to severe EAC in aqueous NaCl when stressed under fixed or rising displacement. The latter is…
The ternary neodymium versatate (NdV3)-based catalyst system, NdV3/SiCl4/Al(iso-Bu)2H, for the stereospecific polymerization of 1,3-butadiene (Bd) has been studied at a catalyst concentration of 0.11 mmol Nd per 100 g Bd. The effects of the concentration of SiCl4 following in situ activation, preformed at 20 °C in the…
The synthesis and characterisation of several hepta-substituted triphenylene derivatives are reported. These unsymmetrically substituted triphenylene derivatives are of three varieties, i) with seven identical peripheral alkoxy chains, ii) two or three out of the seven alkoxy chains have different chain lengths and, i…
composites were prepared using sol‐gel‐derived aerogels and xerogels. The addition of aerogel or xerogel to AgI enhanced the ionic conductivity. The conductivity at room temperature showed a maximum at the composition in both aerogel‐containing and xerogel‐containing composites and was for the aerogel composite. The c…
The yields of the different radiolytic products formed by gamma radiolysis from NaCl brines at ambient temperature and dose rates between 0.1 and 1 kGy/h were determined. At a chloride concentration of 5.3 mol/l, H2, O2, and ClO3- were formed proportional to the dose and independent from the dose rate with G values of…
Obertiite is a new amphibole species from Bellerberg, Laccher See district, Eifel, Germany. It occurs with tridymite, fluororichterite, hematite, rutile, aegirine-augite, kinoshitalite, and fluor-apatite in vugs in volcanic rocks, and crystallized from late-stage hydrothermal fluids associated with recent volcanism. O…
A large portion of the stator core of a rotating electric machine is subjected to magnetic flux that rotates in the plane of the laminations. Iron losses under rotating flux conditions can differ considerably from those due to alternating fields. It has long been suspected that this difference may be responsible for s…
The results of the evaluation of zinc maleate and zinc anthranilate as thermal stabilizers for poly(vinyl chloride) (PVC) are reported in this article. Calcium stearate, diphenyl isodecyl phosphite, and epoxidized soya oil were used as costabilizers. Both zinc compounds showed good stabilizing performance in static an…
A sonochemical approach to the preparation of elongated needles of Pb(OH)Br using a cationic surfactant, cetyltrimethylammonium bromide (CTAB) is reported. A shape transition of the particles is found to occur due to the presence of an organized medium consisting of a cylindrical, interconnected network of thread-like…
Mechanical properties of foams extruded with starch and biodegradable polymers were correlated withingredient formulations and physical characteristics of the extrudates. The type of polymer had a significant effect onfoam compressibility and Youngs modulus. The PLA-starch and EBC-starch foams were softer than the Mat…
We report on the magnetic and magnetocaloric properties of GdFeSi, as obtained from DC magnetisation and specific heat measurements, in applied fields up to 9 Tesla and in a temperature range between 3 and 300 K. The compound orders ferromagnetically at 118 K. In the paramagnetic range it follows the Curie–Weiss law w…
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The catalytic reaction of Co(CO)3NO and Mg at 900 °C has led to the formation of multi-walled carbon nanoflasks.