Materials Literature
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Radical cations of Group 14 element organometallics R4E and R3EER3 (E = Si,Ge,Sn, R = Me,Et) were generated in alkane solutions by X-ray irradiation and studied using the time-resolved magnetic field effect technique. Modeling shows that in alkane solutions the g-factors of Me4E+˙ and Me3EEMe3+˙ are close to those mea…
Failure and stiffness properties of a woven 8 harness satin (8HS) graphite/PMR-15 composite have been investigated at room temperature and at 315°C by performing the ±45° tensile and Iosipescu tests. Acoustic emission has been monitored during testing. The critical loads for the initiation of damage in the composite h…
Our work of new ferroelecric survey was reviewed. A 2 BX 4 -type compounds having Sr 2 GeS 4 structure, where A = K, Rb, Tl and Cs, B = Zn, Co, Cd and Hg, X = I and Br, were synthesized by the Bridgman method. Their dielectric and phase transitional properties were investigated. From the results, several empirical rel…
Abstract The new compound [{(C 2 H 5 ) 2 NH 2 } 2 In 2 Ge 2 S 8 ] · [(C 2 H 5 ) 2 NH] 0.25 was synthesized under solvothermal conditions using elemental In, Ge, and S in diethylamine. The title compound crystallizes in the orthorhombic space group Pna2 1 with a = 12.804(3)Å , b = 17.615(4)Å, c = 13.067(3)Å, V = 2947.2…
Investigation of porous silicon carbide layer morphology and its growth rate was studied along with electrical characterization. Morphology of the formed porous SiC layers was analyzed by scanning electron microscopy. The effective carrier density in porous layers was extracted from the capacitance-voltage characteris…
Foreign object damage (FOD) behavior of two commercial gas-turbine grade silicon nitrides, AS800 and SN282, was determined at ambient temperature through post-impact strength testing for thin disks impacted by steel-ball projectiles with a diameter of 1.59 mm in a velocity range from 115 to 440 m/s. AS800 silicon nitr…
The synthesis of host–guest composites consisting of entrapped poly(acrylic acid) (PAA) and inorganic host MCM-41 is described. The monomer acrylic acid (AA) and initiator azoisobutyronitrile (AIBN) were introduced into the channels of MCM-41 using supercritical CO2 as a solvent at 35.0 °C, followed by free radical po…
A method using the atom-vacancy ordering phenomenon for the visualization of structural vacancies in crystals was suggested and implemented. The ordered nonstoichiometric titanium monoxide Ti 5 O 5 was taken as the object of investigation, because the structural vacancies in this compound can be observed due to the fo…
The use of the glass slag method in the extraction of Sm from Sm–Co alloys was studied. The magnetic SmCo5 phase decomposed into Sm oxide phase and Co phases by the glass slag method. The Sm oxide phase was extracted by the surrounding molten glass slag materials in the glass slag method. The resultant alloys consiste…
We present three-dimensional simulations of field emission through an oscillating barrier from an ideal open (10,0) carbon nanotube without adsorption by using a transfer-matrix methodology. By introducing pseudopotentials for the representations of carbon atoms and by repeating periodically a basic unit of the nanotu…
Abstract X‐ray absorption fine structure (XAFS) analysis and transmission electron microscopy (TEM) have been used for investigating the atomic structure and microstructure of rust formed on a weathering steel and a relevant iron–chromium alloy. The XAFS results have shown that the atomic structure of the rust is an F…
A novel semidiscrete Peierls-Nabarro model is introduced which can be used to study dislocation spreading at more than one slip planes, such as dislocation cross-slip and junctions. The strength of the model, when combined with ab initio calculations for the energetics, is that it produces essentially an atomistic sim…
We study the Schrödinger equation for an off-diagonal tight-binding hamiltonian, as well as the equations of motion for out-of-plane vibrations on the separable square Fibonacci quasicrystal. We discuss the nature of the spectra and wave functions of the solutions.
Disturbances in the wet end can affect both the paper machine runnability and the paper quality. If things go wrong in the wet end, little can be done later in the papermaking process to remedy the problems. Wet end disturbances are often directly related to the different dissolved and colloidal substances (DisCo's) a…
Segmented polyurethane(SPU)s are block polymers which have a good elastic property and thermoplasticity. However, the biocompatibility of SPU is not sufficient, and a living organism rejects the SPU as a foreign material. Thus, some modification is needed to provide excellent biocompatibility and retain the good physi…
Abstract Solid‐state calculations were performed with the program CASTEP to analyze some electronic structure features of the crystal compound Li 6 Gd(BO 3 ) 3 (LIGDBO), which is known to be an efficient gamma radiation detector, in particular when doped with rare‐earth ions. The structure of this material displays a…
In order to increase the performance of silk fabrics, especially their c ease resistance, an epoxy silicone crosslinking agent A (EPSIA) is synthesized and applied to silk fabrics. The physical properties of EPSIA and those of the silk fabrics treated with it are examined. After 240 days' storage, the specific gravity…
TiNi intermetallic compounds were manufactured on an industrial scale using a combustion synthesis process that exploits the heat of formation between Ti and Ni. In this paper we investigate the influence of Ni content on the phase transformation temperature. The TiNi shape memory intermetallic compounds manufactured…
Abstract The amphiphilic 5, 11, 17, 23‐tetra‐ t ‐butyl‐25, 26, 27, 28‐tetrakis(carboxymethoxy)calix[4]arene ( 1 ) forms stable monolayers at the air‐water interface which serve as template to induce growth of CaCO 3 (calcite) single crystals. The nucleation density and the preferred orientation(s) of calcite single cr…
A novel technique to derive the closed-form spatial Green’s function for finite dielectric structures is presented by employing a combination of the characteristic Green’s function (CGF) and complex images (CI) techniques. To show the versatility of this technique, a two-dimensional finite dielectric substrate is stud…