Materials Literature
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X-ray diffraction, differential scanning calorimetry and reflected light microscopy studies are made of disorder-order phase transformations in the region of homogeneity of a non-stoichiometric cubic vanadium carbide, (0.66 < y < 0.88). It is found that according to the composition of the carbide, both an ordered phas…
The pseudoelastic stress/strain hysteresis behavior observed in nickel-titanium (Ni-Ti) shape memory alloys (SMAs) above the austenite finish temperature can be exploited to provide passive structural damping in a variety of applications. The present study characterizes the damping behavior of Ni-Ti SMAs using the com…
An experimental study was performed to determine the effect of aging on martensitic transformations in NiTi, Polycrystalline and single crystal NiTi ([100], [110], and [111] orientations) were both considered, Stress-induced transformations in polycrystalline NiTi were found to closely resemble transformations in sing…
The ability of the paramagnetic macromolecular complex (GdDO3ASQ)30-Orn114 to enhance the water proton relaxation rate has been found to be a function of pH; this behaviour is related to the structural changes occurring in the polypeptide upon protonation of the side-chain NH2 groups.
Because of the isotropic and disordered nature of liquids, anisotropy hidden in many-body intermolecular interactions is usually neglected. Thus, it has been believed so far that the only order parameter required to describe a simple liquid is the density. Not accepting this common-sense view, we argue that a new addi…
An overview is given of the methods for preparation of birefringent films with patterned optical properties and their applications in liquid crystal displays. A versatile method of obtaining patterned films is based on manipulation of the helical twisting power of chiral dopants by photoisomerization reactions. Becaus…
A conjugated tetrapyridylporphyrin dimer has been synthesised, which binds two metalloporphyrin dimers to form a triple strand array; formation of this supramolecular assembly holds both components in planar conformations, increasing the conjugation.
EPR was mainly used to study the morphological, textural and structural behavior of zirconium hydroxide [ZrO(OH)2] with respect to calcination under air at different temperatures. For calcination temperatures less than 700°C, the tetragonal and monoclinic phases of the solid were present. In this range of temperatures…
The hydrothermal reaction of a mixture of V2O5, 1,2,4-triazole (trz), Cu(NO3)2·2.5H2O and H2O yields [{Cu3(trz)2}V4O12], a material constructed from one-dimensional {V4O12}n4n– chains linked to undulating {Cu3(trz)2}n4n+ networks.
Controlled procedures for the covalent anchoring of iron tetrasulfophthalocyanine onto amino-modified silicas have been developed to fix the complex either in a monomer or dimer form. Usually considered as a catalytically inert form, dimeric µ-oxo iron tetrasulfophthalocyanine grafted onto amino-modified silica or MCM…
Double hydroxides of the formula, having the same structure as that of α‐nickel hydroxide have been synthesized by partial substitution of zinc for nickel. The hydroxide having the composition x = 0.25 exhibits prolonged stability in 6 M KOH. Pasted electrodes comprising this material are rechargeable with a stabilize…
Domains in the low-temperature, ferrimagnetic, and ferroelectric, phase of magnetite ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ were investigated in the bulk, via their ferroelastic distortion, by means of synchrotron radiation x-ray topography, complemented by Nomarski optical microscopy on the surface. After cooling throug…
Sample controlled thermal analysis (SCTA) has been used to carefully and reproducibly eliminate the organic surfactant template from pure silica mesoporous MCM-41. The reproducibility allowed a number of intermediate species to be isolated permitting complementary measurements. To understand the mechanisms by which th…
The aristotype and the two ettotypes of the complex perovskite PbFe 0.5 Nb 0.5 O 3 have been refined by the Rietveld method from neutron and x-ray powder diffraction data. To avoid errors due to sample off-stoichiometry or inhomogeneity, only powders obtained by grinding single crystals were analysed. At 523 K the cub…
One of the primary differences among various test methods used to evaluate fabrics for thermal protective clothing is the presence or absence of a horizontal air gap between the fabric to be tested and the test sensor. Numerical modeling and flow visualization experiments were used to study the effect of the size of t…
The dc space-charge model, previously developed by the authors, here is modified to account for the contribution to electrical degradation provided by ac fields. First, the dc model is applied to both dc and ac multistress life test results relevant to a given material. The variations of model parameters from dc to ac…
The perovskite-type compounds Sr 2 LnRuO 6 (Ln = Eu-Lu) have been synthesized, and their crystal structures and magnetic properties have been investigated. Powder x-ray diffraction measurements and the Rietveld analysis show that they are monoclinic with space group P 2 1 / n and that Ln 3+ and Ru 5+ ions are structur…
The absolute fluorescent quantum efficiencies of NBS phosphor standard samples which were excited by a 254nm radiation were measured by a polychromator. The polychromator was calibrated by a conical cavity thermal radiation detector, which used polyvinylidene fluoride (PVDF) films, coated inside with gold black absorb…
The Mechanics-Materials Linkage (M. Meyers, et al.) Essentials to Solid Mechanics (J. Willis) Foundations of Solids Mechanics (J. Rice) Elastic Anisotropy (D. Barnett) Structure Property Relations: Impact of Electron Microscopy (G. Thomas) Nature of Elastic Stiffness and Plastic Strength (J. Gilman) Rate Processes in…
Surface topography appears to be an important but often neglected factor in implant performance. In this study, fibroblasts were cultured on a range of porous polycarbonate (PC) membranes with well defined surface topography (track-etched micropores, 0.2-8.0 microm in diameter) and wettability gradients. The wettabili…