Materials Literature
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The nanometric scale allows an investigation of the Verwey transition: the impact of varying degree of oxidation of Fe cations on this transition was studied by means of zero-field-cooled superconducting quantum interference device measurements in nanometric highly nonstoichiometric particles of pure and Ti-substitute…
Summary The podzolization process is examined in the light of measurements of the solubility characteristics of aluminium fulvate, the extent of dissolution of a proto‐imogolite sol by fulvic acid, the adsorption capacity of proto‐imogolite for fulvic acid and aluminium fulvate, and published evidence. Fulvic acid at…
Hyperbranched aromatic polyamides (pPDT) from A 2 ( p-phenylene diamine)+ B 3 (trimesic acid) reactants have been prepared using direct polycondensation in solution. The influence of various polymerization parameters on the polymer structure development and the sol content, as well as on gel formation, has been thorou…
This article describes a hybrid electrostatic–aerodynamic levitation furnace for the containerless processing and study of oxide materials on the ground. Its operation principle relies on an aerodynamic levitator that allows sufficient electric charge to be accumulated on a sample, due to high-temperature heating, bef…
Nanotube fibers with diameters ranging between 10 and 100 microns were produced by a simple spinning process. These fibers were studied by x-ray scattering--a technique that allows good visualization of the composition as well as the alignment of the constituents. The fibers were found to be composed of bundles of sin…
Uniform silicon single nanodots were synthesized by laser ablation with a differential mobility analyzer (DMA) technique. The Si nanoparticles generated by laser irradiation of a silicon target were actively classified by a DMA and were impacted on the solid surface by a “nanoparticle beam”. By measuring the current o…
The synthesis, crystal structure, and spectroscopic and magnetic properties of a new alternating ferro- and antiferromagnetic, one-dimensional manganese(II) azide complex, [Mn(dpa)(N3)2] (where dpa is the 2,2′-dipyridylamine ligand), are reported. The compound’s crystal structure has been resolved at room temperature.…
Texture formation via high‐temperature deformation in sintered alumina was investigated. Fine‐grained, normal‐purity‐alumina sintered bodies deformed under stresses up to 80 MPa in a temperature range of 1200°–1300°C. Fine, disklike grains formed in the equiaxial fine‐grained matrix during high‐temperature deformation…
Abstract Three series of neat resins, based on methacrylates or dimethacrylates modified with 1‐[3‐(methacryl)propyl]‐3,5,7,9,11,13,15‐heptacyclopentylpentacyclo[9.5.113,9.15,15.17,13]octasiloxane (Methacryl‐POSS or POSS‐MA), were evaluated. Incorporation of POSS‐MA into the polymeric matrix was accomplished in three…
The occurrence of brittle fracture in iridium has attracted significant attention in recent years and is thought to be related to the energetics of the dislocation core, in particular the extremely high unstable stacking energy. Although it is not experimentally possible to measure the unstable stacking energy, first-…
The data on the number of active centers (Cp) and values of propagation rate constants (Kp) have been obtained for stereospecific and non-stereospecific centers at propylene polymerization with catalytic systems of various composition: TiCl3-AlEt3 (I), TiCl4/D/MgCl2-AlEt3 (II), TiCl4 /D/MgCl2-AlEt3-TES (III), where D…
Regenerated cellulose membranes have been traditionally manufactured using the viscose or the copper-ammonia process. Today, membranes made by this process are still used in many fields such as dialysis. However, there are some serious environmental problems inherent in the existing processing routes. The new N-methyl…
Chemically prepared Pb(Zr 0.95 Ti 0.05 )O 3 (PZT 95/5) ceramics were fabricated with a range of different porosity levels, while grain size was held constant, by systematic additions of added organic pore former (Avicel). Use of Avicel in amounts ranging from 0 to 4.0 wt% resulted in fired ceramic densities that range…
Atomic resolution structure determinations of proteins by X-ray crystallography are formidable multidisciplinary undertakings, requiring protein construct design, expression and purification, crystallization trials, phase determination, and model building. Modern mass spectrometric methods can greatly facilitate these…
Abstract The low-temperature alteration of a rhyolitic rock from Kimolos Island, Aegean, Greece, yielded an alteration profile characterized by gradual transition from fresh glass to bentonite containing homogeneous Chambers-type montmorillonite and then to a mordenite-bearing bentonite. Both mordenite and smectite we…
The available studies of the creep behaviour of AZ91 alloy produced by die casting, ingot casting, or thixoforming are reviewed in the present paper. Differences in microstructure and creep response are analysed and discussed with a view to providing a unitary, comprehensive description of the creep behaviour of this…
Investigations on a series of crosslinked poly(ferrocenylsilane) networks that have been prepared via the ring-opening copolymerization of the silicon-bridged [1]ferrocenophane fcSiMe2 (fc = Fe(η-C5H4)2) with controlled amounts of a spirocyclic [1]ferrocenophane fcSi(CH2)3 are reported. These crosslinked poly(ferrocen…
Although the collagen V heterotrimer is known to be involved in the control of fibril assembly, the role of the homotrimer in fibrillar organization has not yet been examined. Here, the production of substantial amounts of recombinant collagen V homotrimer has allowed a detailed study of its role in homotypic and hete…
Large-scale well aligned carbon nitride nanotube films (6 cm in diameter), which are easily processed and show potential for nanomanipulation, have been synthesized by microwave plasma enhanced chemical vapor deposition at a relatively low temperature of 550 °C. The characterization, using transmission electron micros…
This paper presents research aimed at reviewing and comparing constitutive models for Shape Memory Alloy (SMA) behavior under uniaxial loading with experimental data over the entire thermomechanical range of test conditions. Three commonly used representative constitutive models predicting quasistatic SMA behavior – T…