Materials Literature
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The adsorption mechanism of silane coupling agent on the colloidal silica surface is studied with spin-labeled silane coupling agent using ESR method. The density of the adsorbed silane molecules was determined to be approximately 1.5-2 molecules per 100 A2 of the silica surface in 95% ethanol solution. In addition, E…
Insulating systems employing polyethylene terephthalate and polypropylene were tested for dielectric strength and time-to -break under pulsed and ramped voltages in the pulsewidth range of 0.2 to 5 μs with risetimes of 20 ns to 5 ps at a repetition rate of 500 pps. The dependence of dielectric strength and time-to-bre…
Abstract The kinetics of interfacial polycondensation of bisphenol A with isophthaloyl chloride and terephthaloyl chloride in dichloromethane with triethylbenzylammonium chloride (TEBAC) as the catalyst was investigated via measurements of bisphenolate concentration by UV. The reaction was found to be second order wit…
The conducting polymer field has continued its rapid expansion during the past 10 years since the discovery that an organic polymer, polyacetylene, could be doped to the metallic regime. A number of new conducting polymers have since been synthesized and many chemical, structural and physical studies have helped in el…
The corrosion behavior of carbon steel, austenitic stainless steels, Ni-base alloys, and nickel In hot, concentrated caustic soda solutions at the active potential range was investigated. The corrosion rate obtained in the boiling solution was larger than that in the hydrogen-saturated solution of the same concentrati…
Films of the transparent conductor indium‐tin‐oxide (ITO) have been deposited successfully by direct thermal evaporation of metallic indium and tin in an oxygen ambient. Various techniques, such as scanning and transmission electron microscopy, x‐ray diffraction, electron microprobe analysis, Hall measurements, and op…
We describe parallel optical XOR and XNOR logic gates implemented with ferroelectric liquid-crystal (FLC) electro-optic elements to yield naturally a logic in which the binary gate outputs are indicated by two orthogonal polarizations of transmitted light. These gates absorb no power from the incident light beam and h…
Abstract The mineralogy of partially kaolinized strata interbedded with lignite at the San Miguel mine, Atascosa County, Texas, was investigated by X-ray powder diffraction and optical and scanning electron microscopy. The San Miguel lignite occurs in the lower Jackson Group (late Eocene) of southern Texas. Based on m…
Measurements of transverse rupture strength are reported for AISI M2, AISI M 35, AISI T 15 and ASP 30 produced by conventional ingot metallurgy, sintering of cold pressed powders, and hot rolling of HIP billets. Also reported are the size distributions of undissolved carbides and the effects of hot reduction and auste…
Occupational exposure during BWR refueling and annual maintenance periods is determined by radioactive corrosion products, such as 60Co and 58Codeposited on major components and piping of the primary cooling system. The authors have investigated behavior of radioactive corrosion products, e.g. generation, activation a…
Abstract The plane strain fracture toughness and fracture mechanisms of several tough engineering plastics have been studied and compared with poly(methyl methacrylate) (PMMA), a relatively brittle polymer. The tough polymers all are observed to form a multiple craze zone at the crack tip, which is shown to be the pri…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe generation of methylene from methylene iodide on aluminum surfacesK. Domen and Tung J. ChuangCite this: J. Am. Chem. Soc. 1987, 109, 17, 5288–5289Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature dependence of ionic association and of molecular relaxation dynamics of lithium hexafluoroarsenate in 2-methyltetrahydrofuranNaoki. Inoue, Meizhen. Xu, and Sergio. PetrucciCite this: J. Phys. Chem. 1987, 91, 17, 4628–4635Publication Date (Print):August 1, 1987Pub…
A high-performance green-electrochromic display has been developed in a system of p-cyanophenylviologen (p-CV) and potassium ferrocyanide in the presence of sodium hypophosphite and potassium chloride. The main difficulty was in the fact that p-CV reacts with potassium ferrocyanide to form a scale-like green precipita…
The orientational relationship between intergrown lamellae of tetragonal (t) BaTiO 3 and monoclinic (m) Ba 6 Ti 17 O 40 was found to be ( 1 1 1 ) t ||(001) m , (001) t ||( 1 0 1 ) m , and [110] t ||[0 1 0] m . On the basis of this relationship a model of a topotactic boundary between these two phases was constructed.
Magnesium anode testing resulted in the determination of a formula that can be used to predict magnesium anode efficiency. Efficiency increases with increasing electrolyte resistivity and increasing anode current density. Anode potentials are made less negative with increasing electrolyte resistivity. Specific ions ha…
A general method is described for the design of single concave grating optical systems. Proper parameter and variable sets are defined, and a straightforward technique leads to a final set of optimized variable values which minimize a merit function based on spectroscopic performance.
Protein phosphatases present in the particulate and soluble fractions of oocytes of the starfish Asterias rubens and Marthasterias glacialis have been classified according to the criteria used for these enzymes from mammalian cells. The major protein phosphatase activity in the particulate fraction had very similar pr…
Specific volumes and thermal pressure coefficients (∂p/∂T)v of 5CB, 7CB, 50CB, and 80CB were measured from temperatures near their crystalline melting points to above their nematic-isotropic transitions. At TNI, volume changes ΔV of 0.52, 0.67, 0.25, and 0.48 cm3 mol−1, respectively, were found. A discontinuity of 0.0…