Materials Literature
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In the analysis of corrosion behaviors of metals in oil & gas well and chemical plants containing CO2 and/or H2S gas, detailed knowledge of a stable corrosion product and its solubility is essential. Thus, a computer program has been developed that can automatically construct the potential-pH diagram and calculate the…
Synthesis, characterization, and liquid crystal (LC) aligning capability of polyimide (PI) for the active matrix (AM) liquid crystal display (LCD) application are demonstrated and discussed. The synthesized PI materials in this research are featured by: 1) a low curing temperature below 200°C due to their organic-solv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHosloppin, a New Pyrone-Substituted Flavonoid from Hoslundia oppositaBonaventure T. Ngadjui, Apollinaire Tsopmo, Johnson F. Ayafor, Joseph D. Connolly, and Hélène TamboueCite this: J. Nat. Prod. 1995, 58, 1, 109–111Publication Date (Print):January 1, 1995Publication History…
Copper tubes suffer from severe localized attack during storage after rinse and de-greasing process in organochlorine solvents. This type of corrosion is triggered by condensed organic acid vapor, e.g. acetic and formic acids that are decomposition products of the solvents used for rinsing and de-greasing of copper tu…
The radical scavenging effects and anticorrosive properties of polyphenols (gallic acid [GA] and two gallotannins) that contained ortho-trihydroxyl aromatic rings but different numbers of GA moieties and different molecular masses were studied. Scavenging of the 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) by the poly…
Abstract Here we study the dynamics and the conformational properties of Rouse polymers in random layered flows. We obtain explicit expressions for the mean squared displacement of the center of mass of the polymer as a function of time and number of beads. The averages involve both the thermal noise and the realizati…
Platinum is a non-inert material which reacts with oxides when in contact at high temperatures. The degree of such reactions depends strongly on the oxygen partial pressures established in the environment of the Pt-oxide reaction couple. If the oxygen partial pressure is decreased, oxygen is released due to (i) the di…
Complexation–decomplexation equilibria between boronic-acid-appended porphyrins and naphthalenedisulfonates or anthraquinonedisulfonates can be efficiently controlled by the addition of saccharides: this finding is readily applied to the saccharide-controi of photoinduced electron-transfer processes.
In order to provide a quantitative basis to discuss the efficiency of purification of organic mixtures achieved by layer or suspension type melt crystallization operations, experiments of purification by sweating were carried out with naphthalene-benzothiophene solid solution mixtures. The rate and the degree of compo…
The development of power electronics has enabled rapid and nearly continuous control of phase-shifting transformers (PSTs). As a consequence, new possibilities for solving problems concerning not only steady-state but also dynamic conditions in power systems are offered by electronically controlled PSTs. In the paper,…
Abstract Stainless steel (SS) 304L is widely used as a construction material in industries requiring corrosion resistance in nitric acid environments. Representative samples from 20 heats of SS 304L products were subjected to a testing procedure consisting of testing as per the rapid screening test (Practice A) and th…
Abstract A number of novel nonlinear optically (NLO) active polymethacrylates were prepared from the NLO active methacrylates 2a–d with azobenzene side groups and the bulky comonomer 1‐adamantyl methacrylate. The polymers exhibit unusually high glass transition temperatures between 160°C and 190°C. The copolymerizatio…
The diameter-distribution of collagen fibrils in the dermis of human skin and scar tissue has been investigated. In samples of normal skin, normal scar, and hypertrophic scar, prepared for transmission electron microscopy, collagen fibrils were systematically random-sampled and their diameters measured. There was a st…
Cu–Mg–Al hydroxycarbonate, derived from Cu–Mg–Al hydrotalcite, affords yields of >80% for the heterogeneous coupling of phenylethyne to 1,4-diphenylbuta-1,3-diyne in the presence of sodium hydroxide and oxygen.
The distributions of the tangential and radial stresses acting on the yam of a fabric during sewing as the sewing needle is inserted into the fabric have been discussed by means of the mechanical principles of elasticity. The influence on the needle penetration force caused by the shape of the cross section and the pr…
The effects of heat treatment on PVA films containing water soluble plasticizers were investigated. Propylene glycol, glycerol and polyethylene glycol were used as plasticizers. There was synergism between heat treatment and the presence of plasticizers in enhancing the water resistance of PVA films. In the absence of…
Soft magnetic composite (SMC) materials offer design advantages when compared with steel laminations due to their isotropic nature and the relative ease of producing complex net shaped components by the powder metallurgy production route. Iron loss is low at elevated frequencies as the eddy current loss is a small por…
The thermal decomposition of ammonium metavanadate, NH4VO3, has been studied by differential scanning calorimetry (DSC), mass spectrometry (MS) and X-ray diffraction (XRD) in the temperature range 50–500 °C. Different experimental conditions (heating rate and atmosphere) have been explored in various combinations. Dif…
Lattice chains, chain length 200 monomers, generated by the Monte Carlo method, have been studied on a tetrahedral lattice. Real-chain features such as conformational restrictions, variable segment interaction and chain thickness were assumed in the model. The chain vector density distribution function W(R) and the re…
Oxotitanium and oxovanadium β-alkylcorrolates have been synthesized by reaction of corroles H3L with different metal carriers. These complexes retain an aromatic π-electron system and exist as mononuclear species [MO(HL)] containing a MO double bond. Optical and NMR spectroscopy indicated reaction with base leading to…