Materials Literature
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Discotic columnar mesophase behaviour exhibited by ten metal-free and copper 1,4,8,11,15,18,22,25- octa-alkylphthalocyanines has been characterised by optical microscopy, differential scanning calorimetry, x-ray diffraction and electronic absorption spectroscopy. Compounds with side-chains as short as hexyl exhibit on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically conducting polymers containing alternating substituted phenylenes and bithiophene repeat unitsJohn R. Reynolds, Jose P. Ruiz, Andrew D. Child, Kasinath Nayak, and Dennis S. MarynickCite this: Macromolecules 1991, 24, 3, 678–687Publication Date (Print):February 1…
High-level radioactive wastes from the Purex process contain long-lived nuclides, which mainly consist of transuranic elements (TRUs). A partitioning and transmutation method that consists of pyrometallurgical partitioning of TRUs from Purex waste from light water reactor fuel and transmutation using a metal-fueled fa…
Abstract Slow crack growth in a wide variety of polyethylenes have been investigated. The quantitative relationship between: (1) the external variables such as stress, temperature, stress intensity and J‐integral; (2) the morphological variable such as density and crystal size and (3) molecular variables such as molec…
High conducting ITO films were deposited by DC magnetron sputtering using ITO targets. At substrate temperatures of 200°C and 300°C ITO films were reproducibly prepared with resistivities of 1.9×10 -4 Ω·cm respectively 1,4×10 -4 Ω·cm at a deposition rate of 20 Å/s. ITO films prepared at room temperature show after ann…
Abstract The solution chemistry of niobium oxide in alkaline and acidic oxalate solutions was investigated by Raman spectroscopy in order to determine the molecular structures of the various aqueous niobium oxide species. The aqueous potassium niobate species were studied as a function of pH from 14.5 to 0.55. Differe…
The effects of droplet size on light scattering by polymer-dispersed liquid crystal (PDLC) films have been studied theoretically and experimentally. Rayleigh–Gans calculations predict that, provided the droplets scatter independently, backscattering will be maximum at wavelength λ when the droplet radius is about λ/7.…
The interface between Cu and faceted particles of a cubic Al2O3 phase in an internally oxidized CuAl alloy was studied by HRTEM. Image simulations indicate that the Al2O3 precipitates have a highly disordered spinel-type structure. The precipitates grow by ledge migration and possess internal defects, mainly coherent…
Extracellular calcification by the giant celled alga Chara corallina may involve active Ca2+ extrusion from the cell in exchange for protons. The following evidence is presented: CaCO3 incrustations accrete largely along the inside, facing the cell, as revealed by X-ray microanalysis using Sr2+ and Mn2+ as tracers for…
Infrared spectra of thin films (a few micrometers) of hydrated sodium silicate glasses after heating at temperatures from 100° to 400°C were measured in the spectral region from 400 to 4300 cm −1 . Also, Raman spectra of hydrated glasses were measured in the region from 100 to 1400 cm −1 . Water molecules in hydrated…
Human cervix carcinoma cells of the line NHIK 3025 were incubated for 18 h with sulfonated meso-tetraphenylporphines (TPPSn where n = 1, 2a, 2o or 4) followed by 1 h in sensitizer-free medium and then exposed to light. The fluorescing fraction of TPPS4, TPPS2o and TPPS2a has recently been shown to be located intracell…
The tetragonal‐to‐monoclinic martensitic phase transformation in ZrO–3 mol% Y 2 O 3 (PSZ) containing 0 to 12 wt% Al 2 O 3 was investigated by dilatometry, XRD, and SEM‐EDS methods. The propagation of the transformation into the specimen interiors was suppressed by the addition of Al 2 O 3 . The grain size was independ…
A high resolution (5 lines/mm) large area(l4inch) FLCD has been developed for use in various personal and office equipment like computer, workstation, wordprocessor and desktop-publishing systems etc. The 1280 × 1120 pixel screen is simply multiplexed, thus working at a 1/1120 duty rate.
A suite of gem zircon samples from Sri Lanka has been studied using infrared (IR) spectroscopy, X-ray diffraction, and chemical analysis. The degree of metamictization of the zircon, as indicated by unit-cell parameters, increases systematically with U-Th content \nup to the point of total metamictization. The app…
The convection-induced increase of the wave front velocity in the iodate-arsenous acid system can be explained by considering the convective flow velocity caused by the density gradient in the reaction front. The density is decreased by the exothermicity of the reaction and by the positive volume change of the reactio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExploration of new cooperative proton-electron transfer (PET) systems: first example of extended conjugated quinhydrones, 1,5-dihalo-2,6-naphthoquinhydronesKazuhiro Nakasuji, Kenichi Sugiura, Toshikazu Kitagawa, Jiro Toyoda, Hiroshi Okamoto, Kaoru Okaniwa, Tadaoki Mitani, Hi…
Basic processes, parameters, and mechanisms are discussed with special reference to hydrodynamics, mechanical actions of one- and two-phase flows, transport processes, electrochemical steps, and mechanical properties of the wall of the flow system. The terminology is clarified. New results on erosion-corrosion in part…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic mechanical measurement of crystallization-induced gelation in thermoplastic elastomeric poly(propylene)Y. G. Lin, D. T. Mallin, J. C. W. Chien, and H. H. WinterCite this: Macromolecules 1991, 24, 4, 850–854Publication Date (Print):February 1, 1991Publication History…
The magnetic interactions between copper(II) and imino nitroxide free radicals have been investigated in two novel adducts of copper(II)-bis(hexafluoroacetylacetonato): bis(mu-1,3-(2-phenyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy))hexakis(hexafluoroacetylacetonato)tricopper(II) (1) and (2-(2-pyridyl)-4,4,5…
ABSTRACT The importance of immigration, growth, and competition for nutrients and light in benthic diatom succession was studied in experimental channels in a low‐nutrient stream. Diatom accumulation was greater in channels enriched with nitrate and phosphate (NP) than in control channels, reaching about 5 × 10 6 and…