Materials Literature
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We have considered the dynamical evolution of cellular patterns controlled by a stochastic Glauber process determined by the deviations of local cell topology from that of a crystalline structure. Above a critical temperature evolution is towards a common equilibrium state from any initial configuration, but beneath t…
Motivations leading to lowering the primary beam energy in the SEM are summarized and arguments are presented in favour of extending the operation range down to tens and units of eV. Possibilities to produce beams at low energies below 1 keV and very low energies below 50-100 eV are reviewed, particularly the principl…
Based upon thermodynamic considerations, we propose ‘soft, solution processing’, as a means to fabrication of shaped, sized, and controlled advanced materials from aqueous solutions without excess heat, energy consumption, expensive equipment, and precursor(s) as one of the most economical and environmentally friendly…
Two GRADIENT-DEPENDENT COMBINATIONS of isotropic plasticity and scalar damage are proposed. The gradient enhancements of either the plasticity or the damage component of the theory are performed by introducing the Laplacian of a strain measure and an internal length parameter. This makes the constitutive models applic…
Heat treatment at temperatures >835/spl deg/C and compressive stresses >80 MPa substantially increased the magnetostrictive performance of Terfenol-D (Tb/sub 0.3/Dy/sub 0.7/Fe/sub 1.92/) under the condition of zero loading. This heat treatment created a built-in prestress which significantly increased the low stress m…
The modifications induced by excimer laser irradiation of poly(ether ether ketone) (PEEK) surfaces have been investigated as a function of the laser process parameters for laser fluences below the material ablation threshold. In the case of 193 nm laser treatment, a significant increase in the adhesion properties of P…
CdS/CdSe core/sheath nanowires with diameters of 7.7/0.75 nm were prepared by treating CdS nanowires with selenium in tributylphosphine (TBP) at 100 °C for 24 h and were characterized by X-ray powder diffraction, transmission electron microscopy, high resolution TEM, UV–VIS absorption spectra, photoluminescence spectr…
The mechanisms of photoexpansion in As2S3 glass have been studied through the excitation energy dependence. When the glass is exposed to supergap light homega 2.7 eV) in air, photodepression occurs, which is ascribable to photovaporization. In vacuum, the glass always expands. When the glass is illuminated by a weak b…
In order to study electronic and steric effects on δ(103Rh), the103Rh-NMR spectra of a series of [Rh(cod)L2] complexes (with L = nitrogen, oxygen, or chloride) have been measured by gradient-enhanced HMQC (1H,103Rh) NMR spectroscopy. Density functional computations of representative examples have been performed at the…
In chemical vapor deposition (CVD) of copper, adsorption of iodine on the growing film surface greatly suppresses the development of surface roughness such that thick films show a root‐mean‐square roughness and a high specular reflectance of 85% for a laser beam. The films are predominantly (111)‐oriented regardless o…
Three new copper(II) complexes with simple pyrazolate bridges have been prepared, [Cu2(pz)2(dpa)2(H2O)Cl]Cl·H2O 1, [Cu2(pz)2(phen)2Cl2]·2C2H5OH 2 and [Cu2(pz)(phen)2Cl3]·2H2O 3 (Hpz = pyrazole, dpa = di(2-pyridyl)amine, phen = 1,10-phenanthroline) and their crystal and molecular structures determined. The copper centr…
A simple processing route to molybdenum bimetallic nitrides and oxynitrides has been developed, based on the use of precursors resulting from freeze-drying of aqueous solutions of the appropriate common metal salts. Thermal decomposition of amorphous freeze-dried powders originates crystalline mixed oxides, which have…
We report the inducement of large circular birefringence (optical activity) in films of a cyanoazobenzene side-chain liquid-crystalline polyester on illumination with circularly polarized light. The polyester has no chiral groups and is initially isotropic. The induced optical rotation is up to 5° µm -1 at 633 nm and…
Lanthanide ions act as templates in the formation of dinuclear Ln(III) complexes with a cryptand ligand bearing three phenolate groups; the presence of both lanthanide ions into the cavity of the cryptand was confirmed by X-ray structure analysis and spectroscopic data.
The variable pressure scanning electron microscope (VPSEM) is a promising new family of techniques which permits the imaging of insulators without preparation (coating). The elimination of specimen charging is accomplished in the VPSEM by the introduction of air inside the specimen chamber. Unfortunately, directing an…
Calmodulin (CaM) is a 148-residue regulatory calcium-binding protein that activates a wide range of target proteins and enzymes. Calcium-saturated CaM has a bilobal structure, and each domain has an exposed hydrophobic surface region where target proteins are bound. These two "active sites" of calmodulin are remarkabl…
A novel method for mercury(II) selenide thin film deposition on transparent polyester sheets is presented. The method is based on chemical bath deposition in alkaline media, the chemical reaction involved being hydrolytic decomposition of selenosulfate. X-Ray analysis confirmed that the deposited material is {111} tex…
Epoxidation of alkenes with different electronic and steric properties has been performed with high selectivity by sodium periodate in the presence of acetatotetraarylporphinatomanganese(III) complexes containing electron releasing or withdrawing groups at the ortho positions of the aryl rings, in a two-phase (CH2Cl2–…
Co-sublimation of the dithiadiazolyl radical, p-NCC 6 H 4 CNSSN 2 with the inclusion-forming host compound perhydrotriphenylene (PHTP) leads to trichroic crystals of the host-guest complex [PHTP-2]. Molecules of 2 are linked through a CN‥S interaction (ca. 3.03 Å) to form polar chains within the channels of the PHTP h…
An RTV silicone rubber coating applied to insulators in a 345 kV switchyard located near Long Island Sound has depolymerized and become putty-like after six years of service. Coating samples were taken from high creep insulators which were energized and weathered, weathered but not energized, and neither weathered or…