Materials Literature
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The purpose of this paper is to review known art in the area of thermally controlled covalent linkage formation for use in thermally reversible polymer systems. Only 1 :1 adduct forming reactions are considered in this paper; e.g., condensation reactions are not discussed because these reactions are controlled via the…
Morphological stability analysis for the photoelectrochemical etching of n‐type Si is performed, in which the stability of the back‐illuminated Si‐electrolyte interface is theoretically investigated. Both the transport of holes in the semiconductor and ions in the diffusion layer are considered, together with the elec…
This investigation explores direct methanol fuel cells incorporating perovskite anode electrocatalysts. Preliminary electrochemical performance was addressed following incorporation of electrocatalysts into polymer electrolyte (Nafion 417) fuel cells. Perovskite electrocatalysts demonstrating activity towards direct m…
Fast ionic conductors are important to study because of their use in the construction of technologically useful devices such as electrochemical cells, oxygen monitors, and the high-temperature fuel cell. Oxygen-ion conductors form a major subgroup of these materials, and, in particular, stabilized zirconia is one of t…
Switching times 1000-times faster and transition temperatures 50 K lower than those of the first mesogenic palladium complexes characterize the palladium complexes 1 (n =10, 14) reported here. Thus, applications may also become possible for ferroelectric liquid crystals from metallomesogens.
The high-field electrical properties of ferroelectric lead-lanthanum-titanate (PLT) thin films deposited by multi-ion-beam reactive sputtering are presented. Space-charge-limited (SCL) conduction theory incorporating the effects of electron traps is used to explain the current-density dependence on applied voltage. Th…
Different forms of soil aluminum (Al) are involved in the retention of anions and cations, phytotoxicity of Al in acid soils, CEC reduction and soil physical properties such as aggregate stability and water infiltration. Therefore it is desirable to quantify the different forms of Al in soil especially acidic soils. A…
The question of the conditions under which one-dimensional systems support extended electronic eigenstates is addressed in a very general context. Using real-space renormalization-group arguements we discuss the precise criteria for determining the entire spectrum of extended eigenstates and the corresponding eigenfun…
We report on a laboratory study of the role of O 3 , NO 2 , and SO 2 in the sub‐parts per‐million range on the atmospheric corrosion of zinc. Each sample was exposed individually to synthetic atmospheres with careful control of pollutant concentrations, relative humidity, and flow conditions. In addition, we studied t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural investigation into the steric control of polyether complexation in the lanthanide series: macrocyclic 18-crown-6 versus acyclic pentaethylene glycolRobin D. Rogers, Andrew N. Rollins, Russell D. Etzenhouser, Eric J. Voss, and Cary B. BauerCite this: Inorg. Chem. 1…
Three laboratory-based accelerated corrosion tests were investigated to develop improved procedures for assessing corrosion protection properties of organic paint films. The methods investigated were: standard salt-spray (ASTM Standard B-117), a wet/dry cycle corrosion test using a low-concentration ammonium sulfate/s…
peer reviewed
X-ray diffraction in thin layers containing small randomly placed defects is described by means of the kinematical diffraction theory and optical coherence formalism. The method enables us to calculate both the diffracted intensity and its angular distribution, so that it can be used for simulating double crystal and…
The adhesive-sphere interaction potential provides a good model system to study the influence of the attractive well depth on phase behavior and interfacial phenomena. We investigate the solid–fluid phase behavior of adhesive spheres with the modified weighted density approximation (MWDA) of Denton and Ashcroft. We th…
A four-orbital model is used to map the overall dependence of β, the first electronic hyperpolarizability, on \nchemical parameters such as donor/acceptor strength and coupling between bridge and donor/acceptor orbitals. These \ncalculations are used to develop general structure-property relationships for β an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeats of formation of silicon hydride oxide (SiHnO and SiHnO2) calculated by ab initio molecular orbital methods at the G-2 level of theoryCynthia L. Darling and H. Bernhard SchlegelCite this: J. Phys. Chem. 1993, 97, 31, 8207–8211Publication Date (Print):August 1, 1993Publi…
A large fraction of the chemical and refinery processes are catalytic in nature. While the worldwide sales of catalysts are only about $4 billion annually, the economic impact of catalysis comes from the fact that approximately $200 worth of products are manufactured for every $1 worth of catalyst consumed [1]. The ac…
The most important factors contributing to line broadening and background intensity in electron spectra are identified and new design principles for high quality measurements are presented. It is shown that time-dependent potential gradients in the gas cell are responsible for a large part of the ‘‘normal’’ line broad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the spacer moiety on the rates of electron transfer within bis-porphyrin-stoppered rotaxanesJean Claude Chambron, Anthony Harriman, Valerie Heitz, and Jean Pierre SauvageCite this: J. Am. Chem. Soc. 1993, 115, 16, 7419–7425Publication Date (Print):August 1, 1993Pub…
New experimental results of low-frequency Raman scattering from different glasses are presented. They are compared to the vibration density of states obtained from inelastic neutron scattering to deduce the light-vibration coupling coefficient C(ω) as a function of the vibration frequency. It was found that C(ω)∝ω2 at…