Materials Literature
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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 $25.95 paperback
A general purpose micromechanics analysis that discretely models the yarn architecture within the textile repeating unit cell was developed to predict overall, three-dimensional, thermal and mechanical properties, damage initiation and progression, and strength. This analytical technique was implemented in a user-frie…
We investigate the thermal behavior of the (111) surface of silver, using phonon frequencies obtained from ab initio total energy calculations, and anharmonic effects treated within a quasiharmonic approximation. Our results reproduce the experimental observation of a large and anomalous increase in the surface therma…
Parallel algorithms for ab initio calculations of vibrations modes of solids are presented and implemented under PVM. Load balancing and communication problems are dealt with in order to increase parallelism efficiency. For accurate time measurements, synchronisation of processes must be achieved. The results obtained…
The temperature dependence of the optical-absorption edge (Urbach edge) of GaAs is measured in semi-insulating and n-type GaAs (n=2×1018 cm−3) over the temperature range from room temperature to 700 °C. Both the optical absorption and the temperature are measured using a diffuse reflectance technique. The characterist…
A comparative study is reported of transient photoconductivity and ac conductivity in the liquid-crystalline columnar hexagonal (${\mathit{D}}_{\mathit{h}}$) phase of pure and p-doped hexakis(n-hexyloxy)triphenylene. In both materials, charge-carrier transport is dispersive, and the measured carrier mobilities along t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotentiometric, Calorimetric, and Solution NMR Studies of a Tridentate Ligand Which has a Marked Preference for Formation of Bis(ligand) versus Mono(ligand) Lanthanide Complexes and Which Exhibits High Selectivity for Heavier LanthanidesP. Caravan, Tomas Hedlund, Shuang Liu,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRational Design of the First Nonspherical Dendrimer Which Displays Calamitic Nematic and Smectic Thermotropic Liquid Crystalline PhasesVirgil Percec, Peihwei Chu, Goran Ungar, and Jianping ZhouCite this: J. Am. Chem. Soc. 1995, 117, 46, 11441–11454Publication Date (Print):No…
Edible films and coatings based on milk proteins have been developed to be used as a protective layer on foods or between food components. The most important functionalities of an edible film or coating include control of mass transfers, mechanical protection, and sensory appeal. Control of mass transfers involves pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Mechanism of Chemical Enhancement in Surface-Enhanced Raman ScatteringAlan Campion, J. E. Ivanecky III, C. M. Child, and Michelle FosterCite this: J. Am. Chem. Soc. 1995, 117, 47, 11807–11808Publication Date (Print):November 1, 1995Publication History Published online…
Plasma treatment of silicone surfaces is a useful, environmentally-sound method of increasing wettability to improve adhesion. A thin, wettable silica-like layer is produced with various plasma gases such as argon, helium, oxygen and nitrogen. However, in each case the surfaces gradually recover their hydrophobicity.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Plasmon Resonance Permits in Situ Measurement of Protein Adsorption on Self-Assembled Monolayers of Alkanethiolates on GoldMilan Mrksich, George B. Sigal, and George M. WhitesidesCite this: Langmuir 1995, 11, 11, 4383–4385Publication Date (Print):November 1, 1995Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Inclusion Complexes of Poly(propylene glycol) with CyclodextrinsAkira Harada, Miyuko Okada, Jun Li, and Mikiharu KamachiCite this: Macromolecules 1995, 28, 24, 8406–8411Publication Date (Print):November 1, 1995Publication History Published…
The literature on aqueous thermogalvanic cells has been reviewed. Wherever possible, the power conversion efficiency, , relative to that of a Carnot engine operating between the same temperatures and the figure of merit, , of the cell have been extracted from the literature data in order to assess the cell's possible…
We report a detailed study of the size dependence of the ferroelectric transition in an ensemble of ${\mathrm{PbTiO}}_{3}$ nanoparticles produced by coprecipitation. The phase transition was monitored by dielectric measurements, variable temperature x-ray diffraction, and differential scanning calorimetry (DSC). Size…