Materials Literature
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Poly(acrylic acid) (PAA) was the focus of an investigation in the role and behavior of polyelectrolyte dispersants in aqueous‐based colloidal processing of silicon nitride. The steady‐shear flow properties of dense suspensions were examined as a function of pH, particle volume fraction, chain length, and polymer conce…
Ion microprobe analyses of as-grown{1014} faces of B-doped calcite single crystals show that boron oxyanions are incorporated differentially between nonequivalent vicinal faces that compose spiral growth hillocks. The step-selective incorporation pattern for boron anions is opposite to that observed for the tetrahedra…
In order to establish a simple model of protein interparticle interaction near crystallization conditions, we have measured the osmotic compressibility of the metastable fluid phase of hen egg-white lysozyme within the fluid-solid coexistence region. Light scattering measurements were performed in an extended volume f…
Muconate lactonizing enzyme (MLE), a component of the beta-ketoadipate pathway of Pseudomonas putida, is a member of a family of related enzymes (the "enolase superfamily") that catalyze the abstraction of the alpha-proton of a carboxylic acid in the context of different overall reactions. New untwinned crystal forms…
The present paper is a study of the ferroelectric and antiferroelectric behaviour in low molar mass organosiloxane liquid crystal materials classed as mono-mesogens (AB type) and bi-mesogens (ABA type). A systematic study of series of materials all based on the same chiral mesogenic moiety is presented. The mesogen is…
The N-terminal 15 amino acids of the major protein associated with inorganic pyrophosphatase activity in Bacillus subtilis WB600 are identical to those of B. subtilis ORF yybQ. This ORF was amplified from B. subtilis WB600 DNA by PCR and cloned into an overexpression vector in Escherichia coli. Induction of overexpres…
We propose a flow method to produce barium hexaferrite (BaO6Fe 2 O 3 ) particles with hydrothermal crystallization in supercritical water. Aqueous iron(III) and barium nitrate solution at room temperature was pressurized to 30 MPa and then mixed with potassium hydroxide solution (OH:NO 3 = 4) at the same conditions to…
The effect of hydrostatic pressure on the lower critical ordering transition (LCOT) was investigated by in situ small angle neutron scattering on symmetric and asymmetric diblock copolymers of perdeuterated polystyrene and poly( n -butyl methacrylate). These systems exhibit a transition from the disordered to ordered…
We have compared the X-ray structures of 13 thermophilic proteins with their mesophilic homologues, in order to bring out differences in the stability of helices. The energy terms of a helix-coil transition algorithm were used to evaluate helix stability. Helices of thermophilic proteins are more stable than the mesop…
The phase diagram of the Kondo lattice Hamiltonian with ferromagnetic Hund's coupling in the limit where the spin of the localized ${t}_{2g}$ electrons is classical is analyzed in one dimension as a function of temperature, electronic density, and a direct antiferromagnetic coupling ${J}^{\ensuremath{'}}$ between the…
Electrolessly deposited materials were investigated as possible diffusion barrier layers for multilayer microelectronic structures. Attention was focused on selective deposition of barrier layers on various surfaces, the barrier's capability to inhibit Cu diffusion, changes in Cu resistivity caused by barrier material…
Theoretical electronic structure studies on ${\mathrm{Mn}}_{n}$ $(n=2--8)$ clusters have been carried out using a linear-combination-of-atomic-orbitals--molecular-orbital approach within the density-functional formalism. It is shown that ${\mathrm{Mn}}_{2}$ and ${\mathrm{Mn}}_{3}$ have energetically close ferromagneti…
Comprehensive study on electronic and magnetic properties has been performed for doped manganite near the phase boundary of the antiferromagnetic metallic (AFM) state, with changing the nominal hole concentration $x$ and the one-electron bandwidth $W$. In ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}…
Hydrogen-induced changes on the electronic and structural properties of amorphous carbon nitride (a-CNx:H) prepared by ion beam assisted deposition are investigated by x-ray photoelectron, ultraviolet photoelectron, infrared, and Raman spectroscopies. Two series of specimen are studied: films with a constant nitrogen…
Erosion is regarded as a result of the periodic loading of a surface with spherical waves generated at the sites of the collapse of cavitation bubbles. One feature of cavitation loading is the formation of a zone of intense failure at the center of the contact surface. Damage appears a consequence of the formation of…
Estimation of reference intensity ratios ( k i or RIR) can be made on the basis of an atomic scattering function. Tests of regression equations for 50 compounds that predict an approximate reference intensity ratio from the easily computed scattering function have shown usefulness in multicomponent semiquantitative X-…
Experimental solubilities are reported at 25.0°C for fluoranthene dissolved in 36 different organic nonelectrolyte solvents containing ester, ether, hydroxy, chloro, methyl, and tert-butyl functional groups. Results of these measurements are used to test the applications and limitations of expressions derived from Mob…
Molecular chain diffusion in polyethylene crystals is studied using carbon-13 NMR longitudinal relaxation. Conventional slow-cooled polyethylene samples have been treated by means of electron-beam irradiation in acetylene, which forms crosslinks mainly at the fold surfaces. Following saturation, these samples show a s…
Studies of the structure‐property relations in Pb 0.98 Nb 0.02 ‐ [(Zr 1‐ x Sn x ) 0.97 Ti 3 ] 1‐ z O 3 (PZST x /3/2) were performed for 0 < x < 0.50 by transmission electron microscopy, dielectric spectroscopy, and electrically induced polarization and strain methods. As the tin content increased, a general sequ…
Strontium substituted lanthanum manganite La0.5Sr0.5MnO3 powder has been synthesized by solid state reaction method at 1673 K. X-ray diffraction shows that the material exists in a single phase having a perovskite-like structure. Some physical properties such as magnetization versus temperature and electrical transpor…