Materials Literature
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Several copper complexes used successfully as the catalysts for atom transfer radical polymerization (ATRP) were studied by cyclic voltammetry in acetonitrile. These complexes include CuBr or CuCl complexed by 2,2′-bipyridine (bpy), 4,4′-di(5-nonyl)-2,2′-bipyridine (dNbpy), 4,4′-di(n-nonyl)-2,2′-bipyridine (dnNbpy), N…
Crystals of different compositions, namely, [Ni( Ida )( Im ) 3 ] ⋅ H 2 O ( I ), [Ni( Im ) 6 ][Ni( Mida ) 2 ] ⋅ 6H 2 O ( II ), and [Ni( Im ) 2 (H 2 O) 4 ][Ni( Bida ) 2 ] ( III ), have been precipitated from aqueous solutions of the Ni 2+ - Lig 2− - Im systems, where Lig 2− is Ida , Mida , and Bida , respectively. The c…
Tetragonal-to-monoclinic martensite transformation due to water adsorption was found on the surface of both dispersed and ceramic oxide-stabilized zirconia. The transformation is due to local stretching strains arising in the lattice when the charge state of a stabilizer changes because of water molecules that are che…
Adiabatic shear bands self-organize themselves: this phenomenon was investigated in three different alloys ( stainless steel 304L, Ti, and Ti-6%Al-%V) through the radial collapse of a thick-walled cylinder under high-strain-rate deformation (∼10 4 s -1 ). This method was used to examine the shear-band initiation, prop…
Previous work done to measure spall response of U-Nb(6%) alloy showed a somewhat surprising result. In all experiments done previously no evidence for an elastic wave was observed; that is, no two wave structure was detected. In this paper we report on the results of new experiments done to look at the effect in more…
Six soil samples from the Bt2 horizon of red- and yellow-colored soils collected in Southern Japan and Yunnan, China, were used in this study. Detailed mineralogical studies by differential X-ray diffraction analysis showed the presence of hematite in association with goethite in the red-colored soils, whereas no hema…
Reflection and transmission of light in medium/cholesteric/substrate and glass (1)/cholesteric/glass (2) systems are discussed. These systems can be viewed as a cholesteric-filled Fabry-Perot resonator. A modified layer-addition method is used. Rigorous explicit expressions for the elements of the Jones matrices for t…
The surface morphology of polystyrene (PS), poly(ethylene oxide) (PEO), (PS) and polystyrene/poly(methyl methacrylate) blend (PS/PMMA) before and after ultraviolet (UV) irradiation was studied by means of atomic force microscopy. It was shown that the UV-induced changes were more noticeable on PS and PS/PMMA blend tha…
The metal-organic chemical vapor deposition (MOCVD) of ferroelectric thin films is being widely investigated for the manufacture of devices requiring a high density of volatile or non-volatile memory which goes beyond the limits of current mass production techniques. One of the more important challenges in the MOCVD o…
When multiphase alloys are rapidly heated, it is possible to cause melting of the interface between phases. This is called constitutional liquation if, during melting, the bulk composition is in a nonliquid region of the phase diagram but the tie-line between the liquating phases passes through a liquid region. The li…
Based on high resolution neutron powder diffraction (NPD) data, Llobet et al. [Phys. Rev. B 60, R9889 (1999)] have reported a structural transition of ${\mathrm{Pr}}_{1/2}{\mathrm{Sr}}_{1/2}{\mathrm{MnO}}_{3}$ from $I4/mcm$ ${(a}_{p}\sqrt{2}\ifmmode\times\else\texttimes\fi{}{a}_{p}\sqrt{2}\ifmmode\times\else\texttimes…
The anionic copper selenolate complex [Me 4 N] 2 [Cu 4 (SePh) 6 ] reacted with CS 2 in solvents CH 3 CN/CH 3 OH or DMF/CH 3 OH producing an uncharged two-dimensional layer polymeric complex [Cu(S 2 COMe)] n (I) and a mononuclear complex [Cu(S 2 CNMe 2 ) 2 ] (II), respectively. The crystal structure of (I) is reported.
We report precision X-ray powder-diffraction (XRD) data of single phase pure Ti 2 ZrAl . Ti 2 ZrAl samples were prepared by an arc melting method and annealed at 1000 °C for 30 days. XRD analysis was carried out on these samples and it was found that Ti 2 ZrAl has a DO 19 structure (space group P 6 3 / mmc , No. 194).…
Taylor tests have been performed on specimens of ten metallic materials. The different one - dimensional models have been used. In the next step the finite element code LS DYNA has been used in order to deduce the parameters in the Johnson - Cook constitutive equations Using of the mutual comparison of the computed sp…
It is well known that the properties of the materials may be different as the strain rate increases. Advanced ceramic materials such as aluminas, could present an increase in their strength as the strain rate becomes higher. In this paper the investigation is focused on the influence of the strain rate on the tensile…
Neointima formed quickly on vascular prostheses implanted in young dogs but not in aged dogs. Previously, we found that impeding neointima formation on vascular prostheses occurred more frequently in aged animals. From these observations, we hypothesized that neointima formation was age-dependent in dogs. To test the…
The Cotton-Mouton constants for three homologous series of liquid crystals were measured in the isotropic phase. Some of these measurements were performed with high temperature resolution. The results are compared with theories on pretransitional phenomena. The Landau-de Gennes theory proves to be inadequate to descri…
Three different relaxor ferroelectrics, 0.65PMN-0.35PT, Sr 0.61 Ba 0.39 Nb 2 O 6 (SBN), and Pb 0.85 La 0.1 Zr 0.65 Ti 0.35 O 3 have been studied by Brillouin scattering using a microscope with a focal point of 1–2 µm. Relaxation modes have been directly observed for the first time for all three samples. They form at a…
Abstract The interactions between glycine and two Na-, Ca- and Cu-exchanged smectites with different layer-charge location were studied. The sorption of glycine depends on the nature of the interlayer cations (Ca < Na < Cu), and on the type of smectite. Sequential extraction procedures were carried out in order…
The Raman spectra of monoclinic ZnWO4 (c4 2h-space group) are reported over wide ranges of pressure (0-24GPa) and temperature (13-970 K). All 18 Raman active pho-nons are observed throughout these ranges. Combining the pressure and temperature Raman data, an identification scheme is suggested which makes possible to d…