Materials Literature
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Abstract The results of ultrasonic irradiation of polystyrene solutions in toluene, benzene and carbon tetrachloride are described. The effect of a range of conditions such as ultrasonic intensity, solution concentration and varying solvents were investigated. The non‐random nature of the degradation process was clear…
The bis(1,3-dithiolium) dication salts 8a–c have been synthesised in three steps (31–51% overall yields) starting from 1,4-bis(bromomethyl)naphthalene, 9,10-bis(chloromethyl)anthracene and 4,4′-bis(chloromethyl)biphenyl, respectively. The bis(halogenomethyl) compounds 5 were converted into the dipiperidiniumbis(dithio…
Calculations of energy deposition in cylindrical target volumes of diameter and height 1-100 nm, including those similar to the dimensions of biological molecules and structures such as DNA, nucleosomes and chromatin fibre, have been made. The calculations used the Monte Carlo track structure program MOCA8B for electr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and properties of partially neutralized poly(acrylic acid) gelsF. Schosseler, F. Ilmain, and S. J. CandauCite this: Macromolecules 1991, 24, 1, 225–234Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January…
Two allotropic forms of zirconium oxide, monoclinic and tetragonal, have been identified in the scales formed on zirconium alloys. The transition from tetragonal to monoclinic has been followed by X-ray measurements and Raman laser spectroscopy. Information on the average content of the tetragonal phase was obtained b…
Hydrogen-induced loss increases are known to occur in optical fibers, due both to the presence of molecular H<sub>2</sub> and to the reaction of hydrogen with defects in the fibers. To predict the long-term loss increases expected for fibers under normal conditions, it is necessary to rely on accelerated aging experim…
Ferroresonance can occur in power transformers or reactors fed through capacitive coupling from neighbouring phases or lines. Ritz's method of harmonic balance is used to formulate an analytical solution to the problem of fundamental frequency ferroresonance. A two-term polynomial of order 11 is used to accuratel…
Textiles as clothing material must fit the human body and senses. This fitting is an important performance of the textiles besides the utility performance of textiles such as fabric strength. For many years, the performance concerning this fitness has been evaluated subjectively by hand judgement. The fabric property…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox-switched molecular aggregates: the first example of vesicle formation from hydrophobic ferrocene derivativesJulio C. Medina, Isabelle Gay, Zhihong Chen, Luis Echegoyen, and George W. GokelCite this: J. Am. Chem. Soc. 1991, 113, 1, 365–366Publication Date (Print):Januar…
A wide range of ceramic coatings has been deposited on metal substrates by a reaction occurring during dielectric breakdown at the anode surface in an electrochemical cell, which is accompanied by visible sparking at the anode/electrolyte interface. While the majority of work reported has been on oxide coatings deposi…
Recent developments in instrumentation for electron energy loss spectroscopy (EELS) at Gatan R&D are reviewed. A 10-channel intrinsic Si detector with single-electron detection capa- bility is being developed for fast energy-filtered imaging and elemental mapping in the STEM mode. A new type of an imaging filter…
Interferometric measurements of saturation of the nonlinear index of refraction in a semiconductor-doped glass (Schott OG 550) are reported. The index change, measured at a wavelength of 532 nm, reaches a maximum value of ~1.5 × 10−4 at high intensity. It is shown that the magnitude of the corresponding third-order su…
Simulataneous additions of SrO and Al 2 O 3 to ZrO 2 (12 mol% CeO 2 ) lead to the in situ formation of strontium aluminate (SrO · 6Al 2 O 3 ) platelets (∼0.5 μm in width and 5 to 10 μm in length) within the Ce‐TZP matrix. These platelet‐containing Ce‐TZP ceramics have the strength (500 to 700 MPa) and hardness (13 to…
The mechanical properties of wood flour/polypropylene composites may be improved by using coupling agents to enhance the bonding between filler and matrix. We used a two-level, full-factorial experiment to examine the effectiveness of a commercially available additive, Epolene E-43, on strength (tensile, flexural, and…
Many of the problems associated with conventional drug therapy may be circumvented by the use of delivery systems which, in a variety of ways, will optimize drug action. Among the systems being investigated, liposomes hold considerable promise. Versatility in both the structural characteristics of liposomes and their…
Abstract
Hydrogen permeation characteristics of palladium-plated vanadium and vanadium-nickel alloy membranes have been investigated using gas permeation technique in the temperature range 423–673 K and in the hydrogen pressure range 1×104−3×105 Pa. Hydrogen solubilities of vanadium-nickel alloys have been determined using a v…
The crystallization kinetics of a 40Li 2 O · 60SiO 2 (mol%) glass were studied using DTA and both isothermal and nonisothermal DSC techniques as a function of (1) particle size of the glass powder, (2) crucible material, e.g., alumina or platinum, (3) furnace atmosphere, e.g., nitrogen, oxygen, or argon, and (4) surfa…
A new model of the geometrical structure of icosahedral quasicrystals is discussed that is based on icosahedral clusters connected by linkages (consistent with currently accepted motifs of the atomic structure), yet that is also a tiling by four kinds of ``canonical cells.'' Such a geometry is convenient for complete…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectroscopy of peptides: preferential N-terminal adsorption on colloidal silverTonya M. Herne, Angela Ahern, and Robin L. GarrellCite this: J. Am. Chem. Soc. 1991, 113, 3, 846–854Publication Date (Print):January 1, 1991Publication History Published on…