Materials Literature
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A derivation is presented for X(t), the transformed fraction as a function of time, in a phase transformation process which produces randomly oriented anisotropic particles. The key novel element in the development and results is the inclusion of blocking (shielding) effects. The derivation is performed for a 2D syste…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic Resolution of Racemic Chromenes via Asymmetric Epoxidation: Synthesis of (+)-Teretifolione BSusan L. Vander Velde and Eric N. JacobsenCite this: J. Org. Chem. 1995, 60, 17, 5380–5381Publication Date (Print):September 1, 1995Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect Measurement of the Electric Double-Layer Structure in Hydrated Lithium Vermiculite Clays by Neutron DiffractionN. T. Skipper, M. V. Smalley, G. D. Williams, A. K. Soper, and C. H. ThompsonCite this: J. Phys. Chem. 1995, 99, 39, 14201–14204Publication Date (Print):Sept…
Amorphous hydrogenated carbon films (a-C: H) were deposited in a capacitively coupled r.f. discharge reactor. The precursor gas and the amount of doping and inert gas added during deposition were changed in a systematic manner. The d.c. conductivity was measured in the temperature range 80 to 500 K. The conductivity b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Magnetic Properties of a Tetranuclear Copper(II) Complex with a .mu.-1,2,3,4-Squarato Coordination Mode. Crystal Structure of (.mu.-1,2,3,4-Squarato)tetrakis[(tris(2-aminoethyl)amine)copper(II)] PerchlorateIsabel Castro, Jorunn Sletten, Maria Luisa Calatayud, M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural study of poly(vinyl alcohol) in the gel state by high-resolution solid-state 13C NMR spectroscopyMasatoshi Kobayashi, Isao Ando, Takahiro Ishii, and Shigetoshi AmiyaCite this: Macromolecules 1995, 28, 19, 6677–6679Publication Date (Print):September 1, 1995Publicat…
Barium titanate single-crystal particles with various average particle sizes (20-100 nm) were prepared by a hydrothermal method. In the particles as prepared, there were a lot of hydroxyl group and barium vacancies as the lattice detects, and the concentration of the lattice defects increased with decreasing particle…
Specimen damage caused by mass loss due to electron beam irradiation is a major limitation in low-temperature scanning electron microscopy of bulk specimens. At high primary magnifications (e.g., 100,000 x) a hydrated sample is usually severely damaged after one slow scan (about 3000 e-nm-2). The consequences of this…
Three mechanisms by which edges induce stress relaxation in GeSi strained stripes are described and their relative importance is discussed. Relaxation of stresses in the middle of the layers with l/h(=half-width/thickness) varying from 3 to 100 is calculated including the effect of the two mechanisms which are importa…
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…