Materials Literature
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Nanostructured hybrid organic-inorganic solids are a class of materials of growing interest because of their great potential in synthesis and possible applications. All organic molecules containing at least two −Si(OR)3 groups can be transformed by hydrolytic polycondensation at silicon into materials in which the −Si…
The binding energy of H to a (10,0) carbon nanotube is calculated at 24, 50, and 100% coverage using the AM1 and ONIOM approaches. Several different bonding configurations are considered for the 50% coverage case. Using the ONIOM approach, the average C−H bond energy for the most stable 50% coverage and for the 100% c…
The constitutive relation describing the optical response of dielectric crystals in incommensurately modulated phases is derived for the plane-wave range of modulation. The symmetry properties of modulation corrections to the permittivity tensor of such crystals are analyzed with allowance for spatial dispersion. Thes…
A numerical method for estimating the order of angular focusing, which is a most important parameter of electron-optical systems, is proposed. The method is based on the determination of the value of the correlation between a power function and a function of charged-particle entry angle, the latter being constructed b…
Almost all of the major advances in understanding the interaction of X-rays with crystalline matter were made in the early part of the 20th century. By the 1970s, every crystallography laboratory had a single-crystal diffractometer, and powder diffraction was the de facto standard method for phase identification in po…
Abstract The effect of dichlorocarbene modified styrene butadiene rubber (DCSBR) as a compatibilizer in blends of acrylonitrile butadiene rubber and styrene butadiene rubber (SBR/NBR) has been studied. The cure characteristics, physical properties, crosslink density, FTIR studies and low temperature transitions of the…
The synthesis and characterization of some polyesters containing azomethine linkages are reported here. The electrical conductivity of these polyesters is measured and the results are explained with simple Pariser-Parr-Pople calculations. The polymers are doped with Ag and the electrical conductivity of most of the do…
Abstract The spherulitic and lamellar morphologies of melt crystallized isotactic polypropylene (iPP) have been investigated according to various crystallization temperatures and times. In this study, an appropriate chemical etching condition for the observation of iPP morphology by scanning electron microscopy (SEM)…
Nanodiamonds, doped with nitrogen, were successfully synthesized by using urea/methanol saturated solution as nitrogen source and in situ application of negative bias voltage during the growth period. Scanning electron microscope and Raman spectroscopic examinations reveal that increasing the urea/methanol ratio in th…
The effects of various bonding agents on curing characteristics and mechanical properties of oil palm wood flour (OPWF) filled natural rubber composites were examined. Compared to control compound the presence of various bonding agents increase the curing time, t90 , maximum torque (except phenol formaldehyde(PF) and…
The nature and function of flame retardants for polymeric materials is discussed in this review of polymer combustion processes. The phenomenon of combustion is explained, together with the nature of the mechanism of retardation of combustion. Types of agents used to retard the combustion of polymers are discussed, an…
Abstract The ability of a packaging material to protect the food product and extend its shelf‐life depends on several material properties. In this work the effects of material crystallinity and polarity on the quality of fermented milk were studied. The fermented milk is a high‐quality Swedish product, similar to yogh…
The perovskitelike transition-metal oxide ${\mathrm{Gd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{TiO}}_{3}$ is investigated by measurements of resistivity, specific-heat, and electron paramagnetic resonance (EPR). Approaching the metal-to-insulator transition from the metallic regime $(x>~0.2),$ the Sommerfeld…
La 1− y Sr y Fe 1− x Al x O 3−δ perovskites were studied as potential materials for solid‐oxide fuel cell (SOFC) cathodes. The phase relations in the LaFeO 3 –SrFeO 3−δ –LaAlO 3 system were investigated by X‐ray powder diffraction analysis. The defect structure of the La 1− y Sr y Fe 1− x Al x O 3−δ perovskites was in…
The infrared (IR) and Raman spectra of propylene carbonate (PC) containing various concentrations of LiClO4 have been measured and analyzed. The difference in spectra of PC with and without LiClO4 was attributed to the interaction of the PC molecules and lithium ions. This interaction occurs mainly on the carbonyl oxy…
In the early 1960s, Werner Von Braun and others recognized the need for a nuclear rocket for sending humans to Mars. The great distances, the intense radiation levels, and the physiological response to zero gravity all support the concept of using a nuclear rocket to decrease mission time. These same needs have been r…
Two series of p/p and o/o type iron(III)-metal-free porphyrin dimers were synthesized and characterized. The dimers consist of a ferric porphyrin and a free-base porphyrin, covalently linked with an alkoxy chain - O ( CH 2 ) n O -(n = 2–10) at the para and ortho position of two phenyl rings. The ferric paramagnetic ef…
The scattering mechanisms of carriers in natural diamond are investigated theoretically, based on the experimental low-field mobility data. The calculated values of low-field mobility are compared with published experimental data. Three types of intervalley phonon scatterings (zero-order) and acoustic phonon scatterin…
The results of measurements of the dynamic yield stress and the ultimate strength of aluminum single crystals in the temperature range from 15 to 650°C, which is only 10°C lower than the melting point, are presented. The measurements are made on samples under the action of plane shock waves with a pressure up to 5 GPa…
The effect of strain rate on the yield strength and fracture toughness of mild steel was studied in the strain rate range 10-5–102 s-1. The lower yield strength was found to be independent of strain rate in the range 10-5–10-3 s-1. Beyond this strain rate, the lower yield strength was found to vary linearly with logar…