Materials Literature
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$^{7}\mathrm{Li}$ nuclear spin-lattice relaxation rates (${\mathit{R}}_{1}$) versus the temperature at several resonance frequencies (4 to 40 MHz) are reported together with the conductivity measurements, \ensuremath{\sigma}(\ensuremath{\omega}), in the range 1 Hz to 3.76 MHz on 0.${56\mathrm{L}\mathrm{i}}_{2}$S+0.${4…
We have analyzed an Ising-like model, in the mean-field approach, involving two “antiferromagnetically” coupled sublattices. This model simulates the so-called “two-step” spin-crossover transition, for which a precise definition is given. If both sublattices are equivalent, it implies a spontaneous breaking of symmetr…
Grafted polymer layers under variable solvent conditions are studied by Monte Carlo simulations using the bond fluctuation model. Structural information such as monomer density profiles, brush thickness, mean-square displacement of monomers, and positions of the monomers along the chain are obtained for temperatures a…
The physical and chemical phenomena responsible for the atmospheric corrosion of silver are presented. Corrosion layer formation, morphology, and chemical makeup are discussed in the context of silver‐containing minerals and other crystalline structures that thermodynamics and kinetics suggest are likely to be present…
We have studied the stoichiometric (annealed in oxygen), the slightly oxygen-deficient (annealed in vacuum), and the highly defective (sputtered with Ar+) TiO2(110) surfaces and their reactivities to molecular oxygen, molecular water, and 50-eV hydrogen ions using x-ray photoelectron spectroscopy (XPS) and low-energy…
Polymers, tensides, liquid crystals, and colloids have always stood at the forefront of Pierre‐Gilles de Gennes's interests. He obtained the Nobel Prize for Physics in 1991, and his Nobel lecture is a “sentimental journey in the wonderland of soft matter”, which is what he calls complex fluids. In his contribution, de…
A new cavity model that can explain the interaction between viscous effects including vortices and cavitation bubbles is presented in this study. This model, which is named a bubble two-phase flow (BTF) model, treats the inside and outside of a cavity as one continuum by regarding the cavity as a compressible viscous…
Photopolymerization of polymer-coated solid substrates with linearly polarized light is shown to induce an anisotropic, uniaxial orientation of polymer molecules. The linearly photopolymerized (LPP) layers exhibit UV dichroism and optical anisotropy. The resulting anisotropic dispersive surface interaction forces are…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A consistent picture of the evolution of the defect structure is presented for a solid undergoing plastic deformation, when defects are multiplied and arbitrary hierarchical structures are formed. The complete problem is reduced to a description of the kinetics of the formation of a new structural level of plastic def…
Abstract This paper is concerned with the problem of modelling the motion of a bubble close to a rigid structure in an infinite fluid. It is well known that the boundary integral method is a powerful technique for modelling the motion of a single bubble in a fluid. In this paper we shall present a modified boundary in…
Asp222 is an invariant residue in all known sequences of aspartate aminotransferases from a variety of sources and is located within a distance of strong ionic interaction with N(1) of the coenzyme, pyridoxal 5'-phosphate (PLP), or pyridoxamine 5'-phosphate (PMP). This residue of Escherichia coli aspartate aminotransf…
Two distinctive 3,4-dihydroxyphenyl-L-alanine-(DOPA-) containing proteins (Pc-1 and Pc-2) have been isolated and partially characterized from the thorax of the reef-building sabellariid Phragmatopoma californica. They are the first such reported from the phylum Annelida. The proteins are presumed to be soluble precurs…
A single-crystal neutron diffraction study of the cubic Laves phase Fe2Zr at 4.2 K has been made using both polarized and unpolarized incident beams. The samples were prepared from high-purity zirconium and iron and exhibited resistance ratios (rho 293 K/rho 4.2 K) of typically 95, indicative of samples with good long…
Highly coercive isotropic magnets were prepared by pressure-assisted Zn bonding of microcrystalline Sm2Fe17Nx powders. Mechanically alloyed and two-step heat treated powder was mixed with elemental Zn powder and compacted by uniaxial pressing at elevated temperatures. The maximum room-temperature coercivity of such ma…
Changes in the electronic states for Ba1-xKxBiO3- delta ( delta =0 and 0.5) due to various surface treatments (fracturing, scraping and ion sputtering) have been studied by X-ray photoelectron spectroscopy. It is found that marked spectral changes occur as a result of scraping and sputtering; the core levels are broad…
The authors propose a consistent approach to the study of hole self-trapping and diffusion in ionic crystals based on the static quantum-chemical calculation of the self-trapping energy and adiabatic barriers or hole diffusion. The calculations made for MgO revealed the possibility that the hole is localized on one an…
Results of a study on internal stress, hardness, and structure of nitrogen-doped amorphous hydrogenated hard carbon films deposited by rf glow discharge from methane-nitrogen mixtures onto silicon substrate are presented. Films obtained for different N2 partial pressures (bias voltage Vb=−370 V and total pressure P=8…
Black and white images were projected onto n-type silicon (100) wafers during a photoelectrochemical etch to produce a color image that photoluminesces. The photoluminescence originates from a thin layer of luminescent porous silicon that is produced in the photoetch, and the colors that appear in the etched image ari…
Abstract Studies of the thermal and photodegradation of two commercial polymers, stabilized and unstabilized low‐density polyethylene (LDPE), show the effects of weathering in differential scanning calorimetry (DSC) curves. The shape and the size of the melting peak vary significantly in thermal aging and in accelerat…