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Abstract The mechanical hysteresis of a polyether polyurethane thermoplastic elastomer was studied as a function of temperature, percent strain, and deformation energy. Hysteresis values remained small at low temperatures when the extent of the sample deformation did not disrupt the glassy matrix. This was readily evi…
All three viscometric functions are investigated as a function of shear rate for lyotropic solutions of hydroxypropyl cellulose (HPC). Through the use of m-cresol as the solvent, it was possible to investigate liquid crystal solutions at lower polymer volume fractions than have previously been studied for HPC. We find…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReductive quenching of the emission of trans-dioxo(1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane)osmium(VI) in waterSiegfried Schindler, Edward W. Castner Jr., Carol Creutz, and Norman SutinCite this: Inorg. Chem. 1993, 32, 20, 4200–4208Publication Date (Print):Sept…
We conduct a numerical study of the dynamic behavior of a dense hard-sphere fluid by deriving and integrating a set of Langevin equations. The statics of the system is described by a free-energy functional of the Ramakrishnan-Yussouff form. We find that the system exhibits glassy behavior as evidenced through a stretc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic, structural, and spectroscopic studies on copper(II), copper(I), and silver(I) complexes of a series of pyridazinophane and phthalazinophane macrocycles. Unusual extended metallocyclic structuresLiqin Chen, Laurence K. Thompson, Santokh S. Tandon, and John N. Brids…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFully aromatic liquid-crystalline polyesters of phenyl-substituted 4,4'-biphenols and 1,1'-binaphthyl-4,4'-diol with either 2-bromoterephthalic acid or 2-phenylterephthalic acidPradip K. Bhowmik and Haesook HanCite this: Macromolecules 1993, 26, 20, 5287–5294Publication Date…
Renaut bodies (RB) are fusiform endoneurial structures preferentially found at sites of nerve entrapment, often occupying more than 30% of the cross-sectional area of a nerve fascicle. Their composition and significance, however, are still incompletely understood. In this study, further evidence for the link between t…
Abstract The optical absorption properties of Fe‐impurity centers in SrTiO 3 can be used to probe in‐situ the oxygen activity in the sample. The response of the absorbance upon a sudden change the oxygen partial pressure allows the precise investigation of the kinetics of oxygen incorporation (excorporation). In contr…
The breakdown of Molière's multiple-scattering theory for short pathlengths occurring during Monte Carlo simulations with charged particles is demonstrated. It has been found that in certain conditions where the theory is assumed to be valid, significant distortions of the angular distribution occur that make the samp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivergent pathways for the addition of dioxygen to sulfur in nickel cis-dithiolates: an isotopomeric analysisPatrick J. Farmer, Touradj Solouki, Takako Soma, David H. Russell, and Marcetta Y. DarensbourgCite this: Inorg. Chem. 1993, 32, 20, 4171–4172Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpontaneous formation of reverse vesiclesHironobu Kunieda, Kazuyoshi Nakamura, Ulf Olsson, and Bjoern LindmanCite this: J. Phys. Chem. 1993, 97, 37, 9525–9531Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September…
Electrical properties pertinent to memory applications of ferroelectrics are systematically characterized for multi-ion-beam reactive sputter deposited Pb(Zr0.5, Ti0.5)O3 thin films. The processing dependence of electrical properties of the films offers an opportunity for property modification. Low-energy oxygen ion b…
The high-temperature phase of Pb(Mg 1/2 W 1/2 )O 3 , Pb(Co 1/2 W 1/2 )O 3 and Pb(Yb 1/2 Nb 1/2 )O 3 belongs to the space group Fm 3 m with the unit cell size of 2 a c ×2 a c ×2 a c where a c is the lattice parameter of the cubic perovskite unit cell. All these complex perovskites undergo phase transition into low-temp…
The mode I, mode II, and combined mode I–mode II fracture behaviors of a coarse‐grained silicon nitride, a fine‐grained silicon nitride, and an alumina were investigated. These ceramics were fractured from two types of fracture initiating flaws: small surface flaws and large single edge precracks. The small surface fl…
Several technetium-99 BATO (boronic acid adduct of technetium dioximes) complexes TcX(dioxime)3BR (X = Cl) that contain a boron cap R which bears a 2- or 4-nitroimidazole moiety have been prepared from either TcCl(dioxime)3 or from Tc(dioxime)3(mu-OH)SnCl3 [dioxime = dimethyl glyoxime (DMG) or cyclohexanedione dioxime…
RATIONALE AND OBJECTIVES: The objective of the present investigation was to demonstrate a new method for the production of iopromide-carrying liposomes. We studied biodistribution and elimination behavior, as well as the computed tomography (CT) liver imaging properties. METHODS: Iopromide-containing liposomes were pr…
Experimental spectroscopic and time-resolved luminescence measurements of the ${\mathrm{Ti}}^{3+}$:${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ crystalline system have been performed. The absorption and fluorescence spectra obtained have led to a reconsideration of prevailing theoretical models for the radiative relaxation p…
Tetraethoxysilane/oxygen (TEOS/O2) chemistries are now used for low plasma enhanced chemical vapor deposition (PECVD) of SiO2 when high conformality and low temperature are required. The surface processes leading to film growth, carbon elimination, and conformality are not well characterized. We have developed a model…
The ternary phase diagram of Al 2 O 3 ‐La 2 O 3 ‐TiO 2 at 1400°C was determined with 12 compatibility triangles. Al 2 O 3 stabilizes the A‐site‐deficient La 2/3 TiO 3 perovskite structure. According to XRD and microstructural investigations, the solid solution extends along the La 2/3 TiO 3 ‐LaAlO 3 tie line from at l…
The effects of varying the levels of cell disruption achieved by high-pressure homogenization upon subsequent centrifugal separation of cell debris have been defined by measuring sedimentation velocity distributions of the cell debris. Using this data together with particle size distributions, a computer-based model o…