Materials Literature
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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…
Further investigation of the mesomorphism of hydrogen bonded complexes formed between alkoxystilbazoles and benzenedicarboxylic acids has led to a reinterpretation of the phase behaviour. We have found unexpectedly that the most stable complex is at an equimolar ratio.
Symmetric diblock copolymers undergo a weakly first-order microphase separation transition to a lamellar phase. In a thin film of thickness d this transition is altered for two reasons: the film geometry imposes commensurability restrictions on the concentration profiles, and the surface field favors one of the two bl…
Three-phonon umklapp processes are considered as the main intrinsic thermal-resistive processes in the crystals. The splitting umklapp processes are considered as the important process in thermal-resistive processes at low and high temperatures. Based upon a two-dimensional model, the simplest possible model is constr…
Abstract Chernikovite and meta-ankoleite were synthesized with a relatively high crystallinity and the compounds were identified by means of chemical analysis and X-ray diffraction. The infrared spectra were recorded and the bands assigned. From the luminescence spectra, the band-gap energy for both compounds was calc…
Abstract Weathering products formed on the surface of K-feldspar in Yakushima Island, Japan were investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS). XRD confirmed t…
Acid-catalyzed condensation of pyrrole and perfluoroalkyl aldehydes produced, in a single step, α,β-unsubstituted 5-perfluoroalkyldipyrromethanes, which were isolated and characterized for the first time. These dipyrromethanes were used as the key intermediates in the synthesis of trans-perfluroalkylporphyrins as well…