Materials Literature
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Acoustic properties of a-${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ and a-${\mathrm{GeO}}_{2}$ are investigated at low frequencies in the temperature range 10 mKT200 K, using a vibrating-reed technique; the results confirm earlier measurements on other amorphous dielectrics. Whereas the low-temperature data are well describ…
Spectroscopic-ellipsometry (SE) and thermoreflectance (TR) spectra of GaAs are presented. Measurements are carried out on the same bulk sample in the 1.2–5.6 eV photon-energy range at room temperature. These spectra are analyzed based on a simplified model of the interband transitions. Results are in satisfactory agre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrisilyloxonium Ions: Preparation, NMR Spectroscopy, Ab Initio/IGLO Studies, and Their Role in Cationic Polymerization of CyclosiloxanesGeorge A. Olah, Xing-Ya Li, Qunjie Wang, Golam Rasul, and G. K. Surya PrakashCite this: J. Am. Chem. Soc. 1995, 117, 35, 8962–8966Publicati…
TiO 2 films were prepared by rf (13.56 MHz) magnetron sputtering using a mixture of Ar and O 2 gases. At a total pressure of 2 mTorr, 100% rutile TiO 2 films were successfully obtained on non heated substrates with rf power of 200 W, while 100% anatase TiO 2 films were deposited at a pressure of 20 mTorr. Spatial prof…
A hybrid atomistic-finite-element model is compared with the continuum-based Peierls-Nabarro model for several crack orientations in a nickel crystal. Both methods incorporate the same embedded-atom potential for Ni, in order to make the comparison as valid as possible. The agreement (expressed in terms of a stability…
Solid solutions of (1- x )Pb(Yb 1/2 Nb 1/2 )O 3 -( x )PbTiO 3 x =0 to 0.8 were investigated from the viewpoint of dielectric and piezoelectric properties. With increasing PbTiO 3 content ( x ), phases at room temperature continuously changed from antiferroelectric ( x =0), ferroelectric ( x =0.1 to 0.15), relaxor ( x…
Abstract In the present paper an effort is made to model the time‐dependent behavior of high‐density polyethylene (HDPE) with a one‐dimensional integral representation. Owing to the plasto‐viscoelastic behavior of the material, we assume that the total strain can be decomposed into a recoverable viscoelastic strain an…
Hyperbranched polymers prepared by step-growth polymerization of ABx monomers carry a very large number of reactive groups at their numerous chain-ends as well as throughout the macromolecule. These hyperbranched polymers are characterized by very high solubilities and unusually low solution viscosities when compared…
Structural, optical and photoresponse characteristics of ZnO thin films ( approximately 0.1 mu m) prepared by a relatively new chemical deposition method, SILAR (successive ion layer adsorption and reaction), are described. The films are deposited by successive immersion of glass substrate in a dilute solution of Zn 2…
ABSTRACT Degradable films from spray‐dried (SD) and flash‐dried (FD) wheat gluten prepared at various pHs, salt levels, temperatures, and shearing times were compared. Differences were observed in properties of the films related to processing conditions. Films prepared from SD wheat gluten were thicker, and had higher…
The metal hydride electrode is the negative electrode in one of the most advanced secondary batteries ( i.e. , nickel/metal hydride). The objective of this study is to obtain insight on the mechanism of the hydriding/dehydriding reaction in the battery by using the electrochemical impedance spectroscopy (EIS) techniqu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeroxynitrite-Induced DNA Strand Scission Mediated by a Manganese PorphyrinJohn T. Groves and Sudhakar S. MarlaCite this: J. Am. Chem. Soc. 1995, 117, 37, 9578–9579Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 Sep…
We investigated the morphology of dendrite tips through the growth and measurement of pure succinonitrile dendrites at a fixed supercooling of 0.46 K. Many current theories of dendritic growth rely on the assumption that the tip region can be approximated by a paraboloid of revolution. The evidence presented here sugg…
The Escherichia coli maltose system consists of a number of genes whose products are involved in the uptake and metabolism of maltose and maltodextrins. MalT is the central positive gene activator of the regulon and is, together with the cyclic AMP-catabolite gene activator protein system, necessary for the expression…
Protein prenylation utilizes different types of isoprenoids groups, namely farnesyl and geranylgeranyl, to modify proteins. These lipophilic moieties attach to carboxyl-terminal cysteine residues to promote the association of soluble proteins to membranes. Most prenylated proteins are geranylgeranylated. Geranylgerany…
We discuss the scattering theory of nanocrystalline solids, based on an evaluation of the intragrain and intergrain parts of the atomic distribution function. The results are applied to experimental x-ray scattering data obtained on a set of nanocrystalline Pd samples, prepared by inert-gas condensation, with differen…
The potential relevance of polyoxometalate chemistry for providing compounds that can be of interest in molecular magnetism and in the preparation of new classes of molecular materials is discussed. We show that this kind of inorganic complex provides remarkable examples of magnetic clusters for which the number and t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure Organization of Silicate Polyanions with Surfactants: A New Approach to the Syntheses, Structure Transformations, and Formation Mechanisms of Mesostructural MaterialsColin A. Fyfe and Guoyi FuCite this: J. Am. Chem. Soc. 1995, 117, 38, 9709–9714Publication Date (Pr…
functionalized amphiphiles, derived from polystyrene-poly (propylene imine)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbosilane-Based Dendritic PolyolsKlaus Lorenz, Rolf Muelhaupt, Holger Frey, Uwe Rapp, and Franz J. Mayer-PosnerCite this: Macromolecules 1995, 28, 19, 6657–6661Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 Septe…