Materials Literature
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Electrochromism was studied with Nb 2 O 5 layers prepared by thermal oxidation of niobium. The Nb 2 O 5 layers are crystalline and the morphology and thickness of these films play an important role in the response of electrochromic process. Cyclic voltammetry and chronopotentiometry were carried out together with elli…
Abstract A fundamental property of electrostatic potentials is their additivity. This study demonstrates that the electrostatic potential of a negatively charged, cation-substituted phyllosilicate layer can be represented as the sum of two potentials. Viewing cation substitution as a defect, one potential is derived f…
Under rigorously dry conditions, nickel oxide sputtered samples undergo a reversible lithium intercalation‐deintercalation process which is accompanied by a net electrochromic effect. The characteristics of the process have been studied by cyclic voltammetry and by optical transmittance. The use of lithium‐intercalate…
The optical constants of MgF(2) (bulk) and BaF(2), CaF(2), LaF(3), MgF(2), Al(2)O(3), HfO(2), and SiO(2) films deposited on MgF(2) substrates are determined from photometric measurements through an iteration process of matching calculated and measured values of the reflectance and transmittance in the 120-230-nm vacuu…
Neutron powder diffraction and conventional dilatometry have been used to investigate the tetragonal‐to‐orthorhombic phase transformation and the orthorhombic‐to‐tetragonal reversion in a high‐toughness magnesia‐partially‐stabilized zirconia. For this material, the onset temperature on cooling for the tetragonal‐to‐or…
Abstract The bubble size distribution created by the expanding foam plays a key role in controlling the load‐bearing and other mechanical properties of the manufactured structural foam part. A numerical method to study the bubble growth and predict the bubble size distribution in polymeric foams is presented. On the m…
The formulation of a general, complete electrical terminal representation of eddy-current loss in transformer windings is presented. It is shown that the effects of mutual resistances must be considered in addition to the familiar winding resistances (self resistances) for a complete description of eddy-current loss.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic pathways for the electroreduction of oxygen by iron tetrakis(4-N-methylpyridyl)porphyrin or iron tetraphenylporphyrin adsorbed on edge plane pyrolytic graphite electrodesChunnian Shi and Fred C. AnsonCite this: Inorg. Chem. 1990, 29, 21, 4298–4305Publication Date (…
Sulfonic acid ring-substituted polyaniline has been synthesized and characterized by elemental analysis, FTIR, UV-vis and electron spin resonance spectroscopy. Approximately 50% of the total number of phenyl rings in the polymer are mono-substituted by -SO− 3 groups. Without external doping, the ring-sulfonated polyan…
A study of the interactions of single-stranded poly(deoxyadenylic acid) (poly(dA)) with a number of metallo- and nonmetallo-porphyrins is reported. Among the metal derivatives considered is the newly synthesized platinum(II) complex of tetrakis(N-methylpyridinium-4-yl)porphine (PtTMpyP-4). This metalloporphyrin behave…
The potential of Pseudomonas pseudoflava to produce poly-beta-hydroxyalkanoates (PHAs) from pentoses was studied. This organism was able to use a hydrolysate from the hemicellulosic fraction of poplar wood as a carbon and energy source for its growth. However, in batch cultures, growth was inhibited completely at hydr…
Metakaolin is a supplementary cementitious material with pozzolanic properties. Its activation by calcium hydroxide. sulphates and alkali hydroxide is reported. The extent and kinetics of various competing reactions at an early period of hydration were investigated using calorimetry, supplemented by XRD and DTA data.…
The isothermal oxidation of ZrC powders was carried out at relatively low temperatures of 380° to 550°C at oxygen pressures of 1.3, 2.6, and 7.9 kPa under a static total pressure of 39.5 kPa, achieved by mixing with argon, using an electromicrobalance. The oxidation kinetics are described by the diffusion‐controlled J…
Corrosion of 99.999% Al in 1 M NaCl at p H 11 was studied at naturally occurring as well as artificial pits. Electrolytic solution extracted from within natural pits was found to have a p H between 3 and 4. Solution extracted from within artificial pits and complexed with ferron exhibited a UV spectrum that indicated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSterically protected nickel(II) in a N2S2 donor environment: 1,5-bis(mercaptoethyl)-1,5-diazacyclooctane and its methylated derivativeDaniel K. Mills, Joseph H. Reibenspies, and Marcetta Y. DarensbourgCite this: Inorg. Chem. 1990, 29, 22, 4364–4366Publication Date (Print):Oc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and photoproperties of diamagnetic octabutoxyphthalocyanines with deep red optical absorbanceBoris D. Rihter, Malcolm E. Kenney, William E. Ford, and Michael A. J. RodgersCite this: J. Am. Chem. Soc. 1990, 112, 22, 8064–8070Publication Date (Print):October 1, 1990P…
Results are summarized of a comprehensive study of the effects on the SCR process of all major possible poisons encountered in the combustion gases from U.S. coals. A general rule evolved from this study Is that the effect of the additive on the catalyst activity Is directly related to the basicity of the additive; po…
The correlation between the structure and zero-temperature energy of symmetrical tilt grain boundaries (STGBs) in b.c.c. metals is investigated using a many-body potential of the Finnis-Sinclair type for Mo and Johnson's pair potential spline-fitted for α-Fe. As in free surfaces, the misorientation phase space associa…
A Monte Carlo model for simulating final‐stage sintering has been developed. This model incorporates realistic microstructural features (grains and pores), variable surface difusivity, grain‐boundary diffusivity, and grain‐boundary mobility. A preliminary study of a periodic array of pores has shown that the simulatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular topology exchange interaction: synthesis and magnetic properties of [Cu(II)3M(II)] (M = cadmium, nickel, manganese) tetranuclear speciesFrancesc Lloret, Yves Journaux, and Miguel JulveCite this: Inorg. Chem. 1990, 29, 20, 3967–3972Publication Date (Print):October 1…