Materials Literature
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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…
Abstract Anionic living polystyrene and polyisoprene were allowed to react with six tert ‐butyl‐dimethylsilyl ethers of ω‐halo‐1‐alkanols 1–6 , the trimethylsilyl ether of bromohydrin ( 7 ), the tert ‐butyldimethylsilyl ether of 4‐bromophenol ( 8 ), and tert ‐butyldimethylsilyl 3‐chloropropyl sulfide ( 9 ), followed b…
Abstract The effect of concentration of polypropylene grafted with butyl acrylate (PP‐g‐BA) compatibilizer on thermal, morphological, and mechanical properties of polypropylene/nylon‐6 blends has been studied. It was observed that blends with 4.8 wt% concentration of PP‐g‐BA exhibited superior mechanical and morpholog…
Polyimides have been extensively studied in view of their wide industrial applications. Adhesion to a substrate is essential for normal operation of devices. This problem is often solved by the use of an adhesion promoter on the surface of interest. A surface-sensitive technique such as XPS has proved to be a powerful…
We study the structure of diffusive layers in solutions of unstable nonlinear diffusion equations. These equations are regularizations of the forward‐backward heat equation and have diffusion coefficients that become negative. Such models include the Cahn‐Hilliard equation and the pseudoparabolic viscous diffusion equ…
A two-dimensional computational fluid dynamics model is developed to simulate the flow patterns inside the transportation zone of a rotor spinning machine and analyze their effects on yarn properties. The strength and area of recirculation at the inlet of the transfer channel caused by the geometric variation and rota…
To make universal and efficient liposome-based drug carriers, liposomes should be able to recognize and bind other targets beyond their natural targets, the cells of the reticuloendothial system. To make liposomes targeted, numerous methods to couple active substances, primarily, monoclonal antibodies, to the liposome…
Electrochemical properties of corroding mild steel (MS) surfaces were measured in real time using three closely spaced microelectrodes. Dissolved oxygen, pH, and ion currents were mapped simultaneously and noninvasively above a MS coupon partially coated with biopolymer gels. Calcium alginate (Ca-Alg [an extracellular…