Materials Literature
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The morphology and crystalline microstructure of carbon-encapsulated nanoparticles produced in a Huffman-Kr\"atschmer fullerene reactor are studied systematically as a function of location within the reactor. X-ray powder diffraction and high-resolution transmission electron microscopy are used to characterize powder…
We studied liquid and vitreous ${\mathrm{SiO}}_{2}$ by performing first-principles molecular-dynamics simulations. Diffusion in the liquid is shown to occur through correlated jump events, which disrupt the network only for short time periods. The persistence of the network even at high temperatures is confirmed by th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence Dynamics of Noncovalently Linked Porphyrin Dimers, and AggregatesNakul C. Maiti, M. Ravikanth, Shyamalava Mazumdar, and N. PeriasamyCite this: J. Phys. Chem. 1995, 99, 47, 17192–17197Publication Date (Print):November 1, 1995Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination of Cu Ions in High-Silica Zeolite Matrixes. Cu+ Photoluminescence, IR of NO Adsorbed on Cu2+, and Cu2+ ESR StudyJ. Dedecek, Z. Sobalik, Z. Tvaruazkova, D. Kaucky, and B. WichterlovaCite this: J. Phys. Chem. 1995, 99, 44, 16327–16337Publication Date (Print):Novem…
Without a magnetic field ${\mathrm{Pr}}_{0.7}$${\mathrm{Ca}}_{0.3}$${\mathrm{MnO}}_{3}$ exhibits three phase transitions: a change of the lattice symmetry at ${\mathit{T}}_{\mathit{B}}$=200 K, an antiferromagnetic ordering at ${\mathit{T}}_{\mathit{N}}$=140 K, and a canted antiferromagnetism at ${\mathit{T}}_{\mathrm{…
Metalloporphyrins undergo remarkable nonplanar distortions of the macrocycle that perturb the chemical and photochemical properties of these important protein cofactors. Further, the tertiary structure of the surrounding protein can manipulate these distortions as a means of regulating biological function. For cytochr…
A high resolution cross-linked PMMA resist has been synthesized and optimized for the generation of zone plate patterns down to 19 nm linewidth with e-beam lithography. This resist shows an increased resolution compared to PMMA for generating periodic structures with a line to space ratio of 1:1. Furthermore, we devel…
Characteristics of the oxide film formed on type 316 (UNS S31600) stainless steel (SS) in 288°C water under cyclic normal water chemistry (NWC) and hydrogen water chemistry (HWC) conditions were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Auger electron spectroscopy (AES…
Protruding yarns influence a fabric's properties and its end use. This paper discusses a new approach to measuring fabric appearance objectively using image processing techniques by Fourier transform analysis. Characteristics of the fabric surface such as directionality, density of yarns protruding from the fabric bod…
A simple model of bubble dynamics is constructed in which effects of thermal conduction and those of evaporation and condensation of water vapor are included. Results of numerical calculations when a bubble is irradiated by an ultrasonic wave reveal that the effect of thermal conduction is considerable. The calculated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the Photochromic Properties of Amorphous MoO3 Films Using Raman MicroscopyK. Ajito, L. A. Nagahara, D. A. Tryk, K. Hashimoto, and A. FujishimaCite this: J. Phys. Chem. 1995, 99, 44, 16383–16388Publication Date (Print):November 1, 1995Publication History Published on…
The deviation from stoichiometry, δ, in (CrxFe1−x)3−δO4 was measured by thermogravimetry at 1200 °C as a function of oxygen activity, aO2, and cationic composition, x. Moreover, cation tracer diffusion coefficients, DMe∗, for Me = Co, Cr, Fe and Mn, were experimentally determined using radioactive isotopes, Co-60, Cr-…
Suspensions of fumed silica exhibit a wide range of rheological properties, depending on the type of microstructure present. At high silica concentrations, the rheological behavior is ‘‘gel-like,’’ due to the formation of a network consisting of interconnected silica flocs. When large amplitude oscillatory preshear is…
Following the approach of Yu, Singh, and Krakauer [Phys. Rev. B 43 (1991) 6411] we extended the linearized augmented plane wave code WIEN of Blaha, Schwarz, and coworkers by the evaluation of forces. In this paper we describe the approach, demonstrate the high accuracy of the force calculation, and use them for an eff…
A systematic method is presented for constructing effective Hamiltonians for general phonon-related structural transitions. The key feature is the application of group-theoretical methods to identify the subspace in which the effective Hamiltonian acts and construct for it localized basis vectors, which are the analog…
CO oxidation kinetics, at differential conversions, have been studied on model Rh/ceria catalysts over a wide pressure and temperature range to investigate the effect of ceria support interactions with Ph on the catalytic properties. The kinetics suggest that there are two reaction mechanisms in excess CO. The first i…
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Mosby's Diagnostic and Laboratory Test Reference , second ed By Kathleen Deska Pagana, Timothy James Pagana 1994, 960 pp $25.95 paperback
A general purpose micromechanics analysis that discretely models the yarn architecture within the textile repeating unit cell was developed to predict overall, three-dimensional, thermal and mechanical properties, damage initiation and progression, and strength. This analytical technique was implemented in a user-frie…
We investigate the thermal behavior of the (111) surface of silver, using phonon frequencies obtained from ab initio total energy calculations, and anharmonic effects treated within a quasiharmonic approximation. Our results reproduce the experimental observation of a large and anomalous increase in the surface therma…