Materials Literature
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The structural changes and magnetic anomalies accompanying martensitic transformations in Ni–Mn–Ga alloys are briefly discussed. The role of lattice tetragonality of martensite in the reduction of magnetic field needed for the observation of large magnetostrain effect is theoretically analyzed, considering the compens…
Abstract A hyperbranched polycarbosilane of the type [R 3 SiCH 2 −] x [−SiR 2 CH 2 −] y [−SiR(CH 2 −) 1.5 ] z [−Si(CH 2 −) 2 ] l (R = H, –CH 2 CH=CH 2 , or OR) has been prepared, which was used as a source of inorganic/organic hybrid materials and, through pyrolysis, as a precursor to inorganic solids with unusual mic…
We present a method that alleviates some of the sensitivity to the inclusion of diffuse basis functions when calculating partial atomic charges from a Löwdin population analysis. This new method locally redistributes that part of the Löwdin population that comes from diffuse basis functions so that the final charges c…
The properties of porous GaP, formed by anodic etching in are described. Pore size, pore density, and the interpore distance depend on the dopant density and the potential at which the sample is etched. In addition, it is shown that at high potential, the GaP passivates as a result of the formation of an oxide layer.…
The mean first passage time of cyclization τ of a semiflexible polymer with reactive ends is calculated using the diffusion-reaction formalism of Wilemski and Fixman [J. Chem. Phys. 60, 866 (1974)]. The approach is based on a Smoluchowski-type equation for the time evolution, in the presence of a sink, of a many-body…
Compressive tests were conducted in vacuum at temperatures up to 1203 K, on the Ti3SiC2 samples synthesized from 2Ti/2Si/3TiC powder mixture through pulse discharge sintering technique. The compressive strength of Ti3SiC2 compound showed a monotonic decrease with increasing testing temperature. The Ti3SiC2 samples dis…
The crystal structure of [(CH3)4N]4Na2H[alpha-PW11O39].8H2O has been determined by using the Weissenberg camera at the BL04B2 beamline of SPring-8, revealing that it contains a disorder-free lacunary [alpha-PW11O39]7- anion with one sodium cation embedded into its lacuna that links the oxometalate building blocks into…
Porous titanium-nickel shape memory alloys (TiNi SMA) can be fabricated using special engineering technique. This material is a whole porous material with interconnected pores. This porous TiNi SMA retains the unique properties of solid TiNi SMA. Its porosity and pore size can be controlled. Its application to orthopa…
A new inorganic–organic solid, with a 2∶1 phyllosilicate layer structure and octyl chains directly bound to the inorganic sheets via Si–C covalent bonds, was prepared at room temperature from an ethanolic gel with the molar composition RSiO3/2 ∶ 0.255 Al2O3 ∶ 0.5 MgO ∶ 130 CH3CH2OH ∶ 0.62 Na2O. Octyltriethoxysilane wa…
We explore the role of electronic and ionic polarization energies in the physics of “colossal” magnetoresistive (CMR) materials. We use the Mott-Littleton approach to evaluate polarization energies in the LaMnO 3 lattice associated with holes localized on both the Mn 3+ cation and the O 2− anion. The full (electronic…
The mobilities of various electrolyte-derived species in amorphous anodic titania have been determined, with stabilization of the oxide structure by incorporation of silicon species from a sputter-deposited Ti-6 atom % Si alloy. From comparison of the distributions of silicon marker species and electrolyte-derived spe…
MHPB(H)PBC and MHPB(F)PBC were studied by means of refractometric measurements. The refractive indices: n “ (T), n Á (T) and n I (T) were measured using combined methods, applying both appropriately prepared Abbe refractometer and interference wedge. Values of the n “ (T), n Á (T) for the Sm A*, Sm C* and Sm C A * pha…
The formation of macropores by anodization of low-doped p-Si in HF electrolyte has been investigated quantitatively. As anodization proceeds, structures of increasing characteristic size are formed, then a steady state is reached, where macropores grow parallel. The intermediate regime is well understood on the basis…
The crystal structures of the perovskites La2MTiO6 (M = Co and Ni) were determined on the basis of powder neutron diffraction data collected at room temperature. Refinements of the data showed that these compounds have monoclinic symmetry, space group P21/n, and the common structure is a perovskite-type with a partial…
Although the biodegradation of polyurethanes (PU) by oxidative and hydrolytic agents has been studied extensively, few investigations have reported on the combination of their effects. Since neutrophils (PMN) arrive at an implanted device first and release HOCl, followed by monocyte-derived macrophages (MDM) which hav…
Semi empirical equation developed by Yalkowsky and Valvani, and another equation extended by Jain and Yalkowsky were used to estimate the aqueous solubility S w , of some sulfonamides using experimental octanol-water partition coefficients P , entropies of fusion j S f , and melting points t m , determined by DSC meas…
High Performance Electrode for Medium-Temperature Solid Oxide Fuel Cells: Control of Microstructure of La ( Sr ) CoO3 Cathodes with Highly Dispersed Pt Electrocatalysts , Uchida, Hiroyuki, Arisaka, Shin-ichi, Watanabe, Masahiro
It is very imperative to improve delayed fracture properties of high strength steel, which may enlarge its usage. The published literature shows that the susceptibility to hydrogen embrittlement of a novel 1 500 MPa bainite/martensite dual-phase high strength steel is inferior to that of conventional quench-tempered h…
The purpose of this article is to illustrate how conventional precursors can serve, when used with a drop of imagination, to the synthesis of sophisticated inorganic rings and wheels. The self-condensation of the [M2O2S2]2+ fragments under acido-basic process produces, in the presence or absence of guest species, line…
Novolac/layered silicate nanocomposites were synthesized by condensation polymerization of phenol and formaldehyde catalyzed by H-montmorillonite (H-MMT). Exfoliation of the clay was investigated by X-ray diffraction and transmission electron microscopy (TEM). It turned out that the intra-gallery condensation of pheno…