Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic and geometric features of (.eta.5-C5H5)ML 16-electron fragments. A molecular orbital study of ligand effectsPeter Hofmann and Moothetty PadmanabhanCite this: Organometallics 1983, 2, 10, 1273–1284Publication Date (Print):October 1, 1983Publication History Publishe…
Abstract A structure refinement of kaolinite made using the Rietveld neutron profile refinement technique has given non-hydrogen atom positions which were not significantly different from those given by B. B. Zvyagin in 1960. All of the hydrogen atoms have been located; the three inner-surface hydrogen atoms are invol…
The use of steady, normal and oblique shock configurations is explored in calculating the pressure and deformation produced by the impact of a liquid mass on a plane solid surface. Since pressures generated are very large, the change in bulk modulus of the liquid (water) is accounted for by using an equation of state…
A photoelectrochemical method has been developed for etching integral lenses on light-emitting diodes (LED’s). An LED wafer is immersed in an electrolyte and biased at a potential at which the etch rate is directly proportional to light intensity. The image of a photomask is projected onto the surface of the wafer to…
Abstract The crystal structure of kaolinite( P l, a = 5.153(1), b = 8.941 (1), c = 7.403 (1)Å, α = 91.692(3)°, β = 104.860(3)°, γ = 89.822(3)°, specimens from Keokuk geodes) has been refined in detail and that of dickite ( Cc, a = 5.1460(3), b = 8.9376(5), c = 14.4244(6) Å, β = 96.761(5)°) has been re-refined, both fr…
Propionic, n-butyric, isobutyric and phthalic acid esters of (hydroxypropyl)cellulose were prepared and characterized. The aliphatic esters were readily formed by reacting (hydroxypropyl)cellulose with the corresponding acid chloride at room temperature. The phthalic acid ester was formed by reacting phthalic anhydrid…
The relative susceptibilities of Alloy 600 and 690 base metals and I-82 and I-182 weld metals to intergranular stress corrosion cracking (IGSCC) in pure water at 288 C were evaluated. A combination of creviced and noncreviced slow strain rate, smooth sustained load, and precracked fracture mechanics tests were employe…
A relatively new deposition technique involving laser-assisted evaporation is applied to the deposition of thin ZnO films. Highly oriented and crystalline films of ZnO were obtained by CO2 laser evaporation of ZnO powder targets on substrates held at 50–450 °C. Optical transmission spectra of these films show a sharp…
The refractive indices and densities of six liquid crystals—two alkylcyanobiphenyls, three alkoxycyanobiphenyls and one mixture of two alkylcyanobiphenyls have been reported as a function of temperature. The effective polarizabilities αeand αo in the nematic phase calculated using the methods due to Neugebauer, Vuks a…
A technique is presented whereby compressive surface stresses are introduced into transformation‐toughened ZrO 2 ceramics by removing the stabilizing oxides, such as Y 2 O 3 , from the surface. The advantages of this approach over other techniques are discussed, and experimental data confirming the presence of compres…
Abstract Wood fibers from aspen and spruce have been used for filler and reinforcement of polystyrene. The wood fibers used were in the form of refined wood. In order to improve compatibility of wood fibers with polymeric matrices, fibers have been modified by copolymerization with styrene. The kanthate method of graf…
A method for the isolation and purification of pyridinoline from bone collagen was developed, with the use of sulphonated polystyrene resins. The analytical techniques were used to quantify pyridinoline, for which hydroxyallysine is a known precursor, in a wide range of tissues. The structure of pyridinoline proposed…
Gorsky-effect measurements of the diffusion coefficient of tritium (T) in V, Nb and Ta are reported. The measurements were performed at small T concentrations (less than about 1.4 at.%), and in the temperature range from -140 degrees C to 100 degrees C. Comparison with results obtained for H and D shows an increase of…
Dispersion states of aqueous composite Al 2 O 3 /ZrO 2 colloidal suspensions were studied by measuring particle size distribution as a function of pH. Mutual dispersion was achieved at pH values of 2.0 to 3.5. Consolidated composites formed by colloidal filtration reflected the uniformity of the colloidal state. The m…
Abstract not Available.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio investigation on the lowest singlet and triplet state of disilyne (Si2H2)Hans Lischka and Hans Joachim KoehlerCite this: J. Am. Chem. Soc. 1983, 105, 22, 6646–6649Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissu…
Semi-infinite systems are considered which undergo a first-order transition. The global phase diagram is discussed within the framework of Landau theory. Several types of phase transitions are found. At some of these transitions, critical surface phenomena occur since a variety of surface exponents may be defined alth…
During oxygen and carbon tetrafluoride plasma etching of silicon nitride, a light blue and water soluble film is deposited upon the surface of the silicon nitride layer. Depending upon the thickness, this film retards or completely inhibits the desired etching process. This film has been identified by infrared spectro…
There is no simple experimental method which allows the separation of the dielectric constant in contributions of the bulk and those of 90°-domain wall motions. The contribution of the bulk is calculated in this paper for the specific domain configuration in large grains which was revealed by etch patterns. The volume…
The blue phases of two cholesteric systems are studied under the influence of an electric field. The wavelength of maximum absorption due to the selective reflection of circularly polarized light of both blue phase I (BP I) and blue phase II (BP II) turns out to be shifted to longer wavelengths with increasing electri…