Materials Literature
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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…
Interfacial studies of a series of subphthalocyanine (SubPc) macrocycles 1-3, 5 and 6, differently substituted either in the periphery (with polar and donor groups) or in the axial position of the macrocycle (with a chlorine atom or a trihexylsiloxy group), have been carried out. Remarkable changes in the orientation…
The Fokker-Planck equation and molecular-based grand friction tensor are derived for the problem of rotational and translational motions of a structured Brownian particle, including the presence of a structured wall. Using the method of multiple time scales, it is shown that the time independent, grand friction tensor…
The behaviour of vibrational plane waves in disordered solids has been studied theoretically, particularly in the vicinity of the Ioffe-Regel crossover. We have analysed the behaviour of vibrational excitations in vitreous silica, for which we have found the Ioffe-Regel crossover frequency to be THz (for both longitud…
Thermal treatment of 2,4,6-[(NHPr i ) 2 B(NPr i )] 3 B 3 N 3 H 3 in vacuo led to a polyborazine in which the borazine rings are mainly linked by –N–B–N– bridges. Pyrolysis of up to 1400 °C resulted in the formation of high crystallinity hexagonal boron nitride which has been characterised by ESCA, powder X-ray diffrac…
Chemogradient surfaces whose properties are changed gradually along the sample length are of particular interest for the basic studies of the interaction between biological species and surfaces since the effect of a selected property can be examined in a single experiment on one surface. A wettability chemogradient on…
A new thermal model is introduced which is based on unique references, specifically suited to design and optimization of high-frequency high-power magnetic components. This thermal reference model is independent of shape, size and orientation, so that a general set of data may be used to optimize transformer structure…
Phases determined by the molecular-replacement method often suffer from model bias. In extreme cases, the refinement of the atomic model can stall at high free R values when the resulting electron-density maps provide little indication of how to correct the model, sometimes rendering even a correct solution unusable.…
A study of the optical and electrical properties of a conducting polypyrrole–polyoxyphenylene composite, PPy–POP, prepared by insitu electropolymerization is presented. Electropolymerization was performed potentiostatically in a solution of pH 9 which contained the monomers pyrrole, allylphenol and sodium 4-hydroxyben…
Microfibrils differ in their geometrical arrangement between the orthocortex and the paracortex of a wool fibre. An investigation is reported as to whether these differences, combined with a large shrinkage perpendicular to the fibre direction as the fibre dries from an initial wet state, could account for the curvatu…