Materials Literature
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Abstract Based on the Gibbs cannonical distribution, a number of physical quantities is related to crystal growing conditions such as various point defect densities (intrinsic, vacancies, antistructural, complex of some point defects), high‐temperature density of free carriers, homogeneity region width, and impurity d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImproved synthesis of covalently strapped porphyrins. Application to highly deformed porphyrin synthesisTilak P. Wijesekera, John B. Paine III, and David DolphinCite this: J. Org. Chem. 1988, 53, 7, 1345–1352Publication Date (Print):April 1, 1988Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination chemistry, inductive metal-metal bond transfer, and magnetic susceptibility of adducts of tetrakis(trifluoroacetato)dichromiumCarl J. Bilgrien, Russell S. Drago, Charles J. O'Connor, and Ngai WongCite this: Inorg. Chem. 1988, 27, 8, 1410–1417Publication Date (Pr…
The heat capacity of crystalline iodoform prepared by vacuum sublimination has been measured from 50 to 340 K and that of iodoform prepared by recrystallization from acetone measured from 120 to 300 K. Both samples exhibit a phase transition near 260 K. The heat capacity anomaly in the sublimed material shows several…
New measurements are reported for the ionic conductivity of well-annealed crystals of pure NaCl, NaCl doped with Sr 2+ ions, and NaCl doped with S 2− ions. Analysis of these data leads to the conclusions (i) that the Schottky defect model is entirely adequate for NaCl (in contrast to KCl); and (ii) that the activation…
1‐Phenyl‐2‐propyn‐1‐ol (1‐PPO) is a very efficient corrosion inhibitor for oilfield steel in hydrochloric acid. With a suitable surfactant, 1‐PPO can impart >99% protection to API J55 steel in 15% at 65°C for 24h. Chemical analyses of the products formed on the steel surface and in solution indicate that 1‐PPO reacts…
The purpose of this investigation was to (a) begin to evaluate the coagulation curve as a means of selecting the minimal quantity of IgG required to stabilize colloidal gold (Au); (b) determine the effect of the quantity of IgG added, the pH of adsorption, and the isoelectric point (pI) range of the IgG on the quantit…
differences between observed and calculated values was already well established in crystallography. From there it was, in retrospect, only a small step to refrain from using the integrated intensities as observed values but to use the actual measured profile intensities obtained by step scanning the powder diagram. Th…
An algorithm is described for the determination of an experimental (learned) peak shape function, which has been used succesfully in crystal structure refinements from powder data. The function gives an optimal fit to almost any peak shape since it is not based on an analytical expression. It is determined from a sing…
This user's guide documents two computer programs that supplement the recently revised Army Technical Manual TM 5-855-1. FunPro allows the user to display and scroll through the text of the manual, search for key words and/or phrases, display the curves and illustrations on a microcomputer monitor and produce hard cop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence spectra and lifetimes of cerium(III) compounds as indicators of solution behavior and radiative efficiencyPaulette N. Hazin, Chitra Lakshminarayan, Linda S. Brinen, Joseph L. Knee, Joseph W. Bruno, William E. Streib, and Kirsten FoltingCite this: Inorg. Chem. 19…
Abstract Photooxidations of the evaporated films of rubrene, naphthacene, and pentacene were investigated by means of X-ray photoelectron spectroscopy. A rubrene film was found to be photooxidized far more easily than a naphthacene film although the molecules of rubrene and naphthacene in solution are known to be almo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVerification of the "cation-popping" doping mechanism of self doped polymersY. Ikenoue, J. Chiang, A. O. Patil, F. Wudl, and A. J. HeegerCite this: J. Am. Chem. Soc. 1988, 110, 9, 2983–2985Publication Date (Print):April 27, 1988Publication History Published online1 May 2002P…
Abstract Poly(methyl methacrylate) has been grafted onto chitosan by using Fenton's reagent as a redox initiator in an aqueous medium. Initiation by Fenton's reagent was carried out in the presence of atmospheric oxygen. The percentages of grafting, efficiency, and homopolymer were found to depend on chitosan (RchitOH…
Polyurethanes offer the greatest versatility in compositions and properties of any family of polymers. For implantable medical devices, a few specific elastomeric polyurethane compositions have demonstrated a combination of toughness, durability, biocompatibility and biostability not achieved by any other available ma…
Continuing efforts in vascular prosthetic design are focused on understanding the characteristics required for function of small internal diameter and low-flow prostheses. The pioneers of vascular surgery developed large diameter textile prostheses for successful reconstruction of the aortoiliac vessels, but fabric gr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe formation, characterization, and reactivity of the oxene adduct of [tetrakis(2,6-dichlorophenyl)porphinato]iron(III) perchlorate in acetonitrile. Model for the reactive intermediate of cytochrome P-450Hiroshi. Sugimoto, Hui Chan. Tung, and Donald T. SawyerCite this: J. A…
Abstract The present paper introduces a new fundamental approach to the modeling of diffusion‐controlled free‐radical polymerization reactions. Our analysis follows the original work of Chiu, Carratt, and Soong (CCS), according to which the termination and propagation rate constants are expressed in terms of both a pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA convenient synthesis of alkali metal selenides and diselenides in tetrahydrofuran and the reactivity differences exhibited by these salts toward organic bromides. Effect of ultrasoundDennis P. Thompson and Philip BoudjoukCite this: J. Org. Chem. 1988, 53, 9, 2109–2112Publi…
In recent theoretical work we have shown that the sintering of a composite is strongly affected by the shear deformation of the continuous phase. This phenomenon was studied experimentally in a model system consisting of a TiO 2 matrix dispersed with nondensifying agglomerates of Al 2 O 3 . The results of this study a…