Materials Literature
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Magnesium products provide an excellent strength-to-weight ratio, good fatigue strength, high impact strength, good corrosion resistance, high-speed machinability, and good thermal and electrical conductivities. As a result, applications are expanding in almost every industry. Dozens of automotive components are now m…
Over the last decade, the focus of titanium alloy development has shifted from aerospace to industrial applications. The titanium industry has been very dependent on the aerospace market, and this sector will constitute a significant percentage of total consumption for years to come. However, titanium is increasingly…
Nature usually combines polymers with short degradation times with polymers having long degradation times in an energy and material optimized process involving hierarchical systems. Sometimes a natural system of polymers has evolved to degrade in a month, sometimes in many years. The building blocks of the plant and a…
Abstract The structure, morphology and organisation of the cusps of the major lateral radula teeth of the chiton Plaxiphora albida have been examined using light, transmission and scanning electron microscopy, together with energy dispersive X‐ray analysis and Mössbauer spectroscopy. In this chiton species, both the a…
The electrical resistivity of TiB2 has been measured using a DIA-6 cubic anvil apparatus at pressures up to 8 GPa and temperatures up to 800 K. The ambient-condition resistivity is determined to be 13.3 (±0.9) μΩ cm. The resistivity decreases with increasing pressure. At pressures above 2 GPa, the pressure dependence…
Sodium‐rich NASOCON‐type ceramics, the NaM 2 (PO 4 ) 3 + y Na 2 O (M = Ge, Ti, Hf, Zr) system, were investigated in order to obtain a material having a high Na + conductivity and high density. The ionic conductivity and the sinterability were greately improved by an increase in the valve of y for all of the system exa…
The application of chelation chemistry to the etching or removal of iron and iron oxide is investigated. Reactions of iron and iron oxide with 1,1,1,5,5,5‐hexafluoro‐2,4‐pentanedione , 1,1,1‐trifluoro acetic acid , and trimethylsilyl‐1,1,1,5,5,5‐hexafluoro‐2,4‐pentanedione (SEE + hfac) provide insight into the mechani…
Abstract A new process to synthesize thermally stable mesoporous molecular sieves of MCM‐41 structure based on delayed neutralization at ambient temperature was investigated. All samples synthesized by this new method have BET surface areas of about 1100m 2 /g and possess high thermal stability up to 900°C. Higher cry…
Abstract Phosphonate‐scale inhibitors are commonly used to prevent scale formation in many industrial processes involving high‐salinity brine solutions. To effectively prevent scale formation in these industrial processes, one must have a fundamental understanding of how phosphonates are released into high‐salinity br…
<div class="htmlview paragraph">The effect of a number of lubricity additives on the performance and no-harm characteristics of low sulfur diesel fuel has been studied. The effectiveness of conventional versus novel products is discussed and the suitability of current bench test procedures reviewed.</div>…
Based on a cross‐sectional transmission electron microscopy study of dislocation configurations in boron doped p + silicon layer, the distribution of residual stresses in the boron diffused silicon layer as well as in the p + silicon films that were made from this layer are formulated. The calculated deflections of th…
Elemental composition and distribution in individual teeth of the whole radula of the chiton Cryptoplax striata were analyzed using energy-dispersive spectroscopy. Both the element deposited and its position within the tooth vary according to the stage of mineralization. The initial site of mineralization is the junct…
Electrochromic molybdenum trioxide thin films were prepared by thermal oxidation in air of electrodeposited molybdenum trisulfide. , prepared at temperatures ranging from 400 to 550°C were found to be polycrystalline. The best electrochromic properties (coloration efficiency and coloration time) evaluated in 1 M /prop…
The effect of OH content on fractoluminescence spectra in silica glasses was investigated. The spectra consisted of the 1.9- and 2.7-eV bands. The intensity of the 2.7-eV band was larger in lower OH samples. This is because the oxygen-deficient center (ODC) can be more easily created on the fracture surface of silica…
We report x-ray photoemission spectra of the surface of iron oxide (FeO) particles. The research grade high purity FeO sample was commercially obtained from Alfa/AESAR. The XPS spectra were measured with the Physical Electroncs Model 5400 x-ray photoelectron spectrometer using unmonochromatized Mg Kα x-rays at two pas…
Abstract The structure of benzene films that were vacuum-deposited on cold-metal substrates to be 5—20 μm in thickness was studied with Raman spectroscopy and X-ray diffraction. Films deposited below 30 K were amorphous. They crystallized when the temperature was raised to about 60 K. If the substrate temperature at s…
A method is described for the assessment of the dissolution behavior of solid dosage forms with a high content of a very water insoluble drug. In this method the dissolved drug is continuously extracted from the aqueous dissolution medium into an organic phase. The reported data on the dissolution of artemisinin show…
Abstract The formation of well‐oriented MgAl 2 O 4 spinel films by solid state reactions between (i) a MgO (001) substrate and an Al 2 O 3 vapour and (ii) a sapphire (1 1 .2) substrate and a deposited solid MgO film, respectively, is experimentally investigated. Composition, structure and morphology of the films are c…
High‐surface‐area silicon oxycarbide gels and glasses were synthesized from mixtures of methyldimethoxysilane (MDMS) and tetraethoxysilane (TEOS) through acidic hydrolysis and condensation. A surface area of ∼275 m 2 /g and an average pore size of ∼30 Å was obtained for a 50% MDMS‐50% TEOS glass at 800°C under a flowi…
A series of blends of high molecular weight polyamide 11 (PA11) and three different polar molecules [i.e., N-butyl benzene sulfonamide (BBSA), δ-valerolactam, and ω-laurolactam] have been studied by differential scanning calorimetry (DSC), Fourier transform infrared microscopy (FTIR), differential mechanical thermal a…