Materials Literature
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Measurements are presented of the long-time self-diffusion coefficient and of the low shear limiting viscosity of dispersions of charge stabilized colloidal silica spheres. Long-time self-diffusion coefficients were measured using fluorescence recovery after photobleaching (FRAP), the theory of which is presented and…
Abstract 3,3‐Bis[4‐(4‐aminophenoxy)phenyl]phthalide ( II ) was used as a monomer with various aromatic dicarboxylic acids and dianhydrides to synthesize polyamides and polyimides, respectively. The diamine II was derived by a nucleophilic substitution of phenolphthalein with p ‐chloronitrobenzene in the presence of K…
Bacterial periplasmic binding proteins are initial receptors in the process of active transport across cell membranes and/or chemotaxis. Among them, the histidine-binding protein (HisJ) has been extensively studied from the biochemical, physiological, and genetic points of view. The three-dimensional crystal structure…
Cross-linking of collagen-based biomaterials increases their strength and persistence in vivo. Recently, we described an efficient cross-linking process via the formation of acyl azide groups on methylated carboxyl groups of collagen using hydrazine and nitrous acid (referred to here as the hydrazine method). In this…
A theoretical model is proposed to describe the quasi-one-dimensional organic ferromagnet polyBIPO. Different from Ovchinnikov's model, we consider the itineracy of \ensuremath{\pi} electrons, the strong electron-phonon interaction, and electron-electron correlation in a one-dimensional system. Within the mean-field t…
Two methods for the determination of scattering length density profiles from specular reflectivity data are described. Both kinematical and dynamical theory can be used for calculating the reflectivity. In the first method, the scattering density is parameterized using cubic splines. The coefficients in the series are…
Alternating layers of radicals of the π-electron donor 1 and of polyoxonions [CoW12O40]6− (2, polyhedral representation) are contained in the title compound. Thus, organic charge carriers and inorganic electron-acceptor components lie next to each other. Since the polyoxometalates can accommodate different metal ions…
New concepts for a high performance catalyzed‐reaction layer for medium temperature operating solid oxide fuel cells were proposed. Mixed conducting oxide particles, samaria‐doped ceria (SDC), were employed as the anode material utilizing highly dispersed noble metal catalysts on their surface. As the cathode material…
The magnetic and structural properties of pulsed laser deposited MnZn–ferrite films have been examined. The results show that the uniaxial anisotropy, ferromagnetic resonance linewidth and coercive force are strongly influenced by the microstructure of the films, and the saturation magnetization and first-order magnet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservations of Latex Particle Two-Dimensional-Crystal Nucleation in Wetting Films on Mercury, Glass, and MicaAntony S. Dimitrov, Ceco D. Dushkin, Hideyuki Yoshimura, and Kuniaki NagayamaCite this: Langmuir 1994, 10, 2, 432–440Publication Date (Print):February 1, 1994Publica…
We cloned and sequenced the leuB gene encoding 3-isopropylmalate dehydrogenase from Escherichia coli K-12 (JM103). Errors (33 residues) were found and corrected in the sequence previously reported for the leuB gene of Thermus thermophilus. The three-dimensional structure of the thermophile enzyme and the amino acid se…
New results on the R ± 9° reconstructed α‐Al 2 O 3 (0001) surface, which can be obtained after heating at high temperature (1400°C) under vacuum, are presented. The atomic structure has been studied by combining low‐energy electron diffractometry and grazing incidence X‐ray scattering. The surface structure is found t…
A model is presented to explain the formation and morphologies of 3-d periodic surfactant-silicate mesostructures. The structures of lamellar, hexagonal tubular and a minimal surface cubic liquid crystal/silicate phase are described.
In a previous article, we proposed a model to explain the unwinding transition in an electric field of a frustrated cholesteric liquid crystal sandwiched between two glass plates imposing a homeotropic anchoring. We found that three distinct solutions exist in materials of negative dielectric anisotropy: first, the ho…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Density Functional Investigation of the Geometrical and Electronic Structure of the SiCln and SiCln- Series, n = 1-5G. L. GutsevCite this: J. Phys. Chem. 1994, 98, 6, 1570–1575Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published…
We examine the infinite frequency elastic moduli of steeply repulsive inverse power, r−n, potential fluids. Using molecular dynamics simulation we show that these are proportional to n and therefore diverge in the hard-sphere n→∞ limit, which we also prove independently for the case of hard spheres.
Specific heat measurement was performed in the temperature range from 800 mK to 62 K on the regenerator material Er 3 Ni which is an antiferromagnet with a Néel temperature of 6.1 K and possesses a large volumetric heat capacity even at temperatures above T N . The magnetic contribution to the specific heat has been c…
Martensitic phase transitions in a stressed cubic crystal are studied by means of Landau theory with a two-component order parameter. The stress-temperature phase diagram is analyzed theoretically and is shown to consist of six essentially different regions isolated by the liability lines of austenite, tetragonal mart…
The influence of small additions of three selected oxides on the microstructure and the mechanical behavior of high‐purity silicon nitride was systematically investigated. Dense silicon nitride bodies doped respectively with SiO 2 , Y 2 O 3 , and Yb 2 O 3 were fabricated by hot isostatic pressing (HIP). Two different…
Abstract The anionic polymerization of isoprene with n ‐butyl lithium and polar modifier such as TMEDA and tripiperdinophosphine oxide were studied and kinetic and reactor models are proposed for these systems. Reactor conversion, molecular weight distribution and polymer glass transition temperature had been calculat…