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Abstract The cathodic protection effect of zinc in zinc pigmented coatings can be clearly recognized above a certain pigment concentration. According to the results obtained during potentiostatic polarization experiments such an effect can be expected above 90% Zn. This effect will still be present after 30 days in so…
The electrical properties of tin oxide films have been measured as a function of phosphorus doping. It is shown that the electron concentration increases monotonically with phosphorus doping, with about 7.7% of the incorporated phosphorus being active. An oxygen deficiency is also present in these films, and is found…
Abstract For cotton fabric not treated with a flame retardant (FR), the oxygen index (OI) increases slowly but at a constant rate with moisture content (MC). Above a MC of roughly 33% which roughly equals the water fiber saturation point of the cotton fiber, the increase becomes more rapid but the relation appears to…
The molecular packing in p-hydroxy-cinnamic acid has been determined by single-crystal x-ray analysis in order to establish the role played by hydrogen bonding in inhibiting mesophase formation. The molecules exist in the crystal as centrosymmetric hydrogen-bonded dimers whose long axes are inclined at ± 84.7° to the…
Abstract Raman scattering spectra of single crystals of Rochelle salt are recorded at 2 K and at several temperatures between 248 and 300 K in the spectral region from 0 to 4000 cm −1 . The frequencies of some phonon modes soften or harden in the intermediate ferroelectric phase between the two Curie points which are…
Undercutting phenomena in Al plasma etching were investigated. Photoresist, SiO 2 and Si 3 N 4 were used for etching masks. PSG, Si(100), Si 3 N 4 and Al 2 O 3 were used for underlying layers. In various combinations of etching masks and underlying layers, only photoresist mask exhibits no undercutting. However, even…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular and crystal structure of a metalloporphyrin containing the MoO22+ unit: cis-dioxo(5,10,15,20-tetra-p-tolylporphyrinato)molybdenum(VI), MoO2(TTP)Bernard F. Mentzen, Michel C. Bonnei, and Henry J. LedonCite this: Inorg. Chem. 1980, 19, 7, 2061–2066Publication Date (P…
The technique of Brownian dynamics is used to calculate the time and scattering vector dependence of the structuring in colloidal systems. The van Hove space-time correlation functions and the corresponding intermediate scattering functions are presented; the latter are in good qualitative agreement with those obtaine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Charge Transfer Complex Behavior, and Electronic Transport Properties of Novel Electron-Acceptor Polymers Based on TrinitrofluorenoneS. Richard TurnerCite this: Macromolecules 1980, 13, 4, 782–785Publication Date (Print):July 1, 1980Publication History Published o…
A distinction is made between the theoretical mechanical behaviour of cubic crystals in [100] loading (i.e. transverse stresses are zero) and [1001 deformation (i.e. transverse stretches are zero). In the former, a primary loading path passes through thee zeros (the unstressed f.c.c., b.c.c. and b.c.t. states); in the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of lattice anions on the racemization of optically active metal chelate salts in the solid state. 1. [Fe(phen)3]X2, [Fe(bpy)3]X2, [Ni(phen)3]X2, and [Ni(bpy)3]X2, where X- = chloride(1-), bromide(1-), iodide(1-), or perchlorate(1-)Terufumi Fujiwara and Yuroku Yamamoto…
Abstract Investigations into the intergranular stress corrosion cracking (SCC) of unalloyed steel St 36 in carbonate‐bicarbonate solutions have shown that SCC susceptibility is limited to the potential range of magnetite formation for both constant load and constant strain rate tests. Experiments to determine the cree…
Hydrolysis of the gentisate ring-cleavage product, maleylpyruvate (cis-2,4-diketohept-5-enedioic acid), was shown to be catalyzed by an enzyme, maleylpyruvate hydrolase 11, in Pseudomonas alcaligenes (P25X1) after growth with 3-hydroxybenzoate. This activity was separated from fumarylpyruvate hydrolase activity during…
Stoichiometric cobalt ferrite was synthesised in the laboratory using a standard ceramic method and the crystal structure was identified by X-ray diffraction using FeK alpha radiation. The oxidation states of the cations were determined by studying the chemical shifts. The degree of inversion in this ferrite was estim…
Glaiis transitions of As-Se glasses have been investigated over a wide range of compositions by using differential \nscanning calorimetry. The variation of Tg with composition has been interpreted on the basis of a bond-lattice \nmodel.
The X-band (9 GHz) ESR spectra of the copper(I1)-doped pseudotetrahedral complex dichlorobis(tripheny1phosphine oxide)zinc(II) have been recorded on single crystal at 4.2 K. They are interpreted by using the spin Hamiltonian parameters g, = 2.46, gr = 2.08, g3 = 2.08, AI = 40 X lo4 cm-I, A2 = 25 X lo4 cm-I, AB = 20 X…
Abstract The rate of removal of mineral oil soils from model polyester sub‐strates by the roll‐up mechanism shows a marked dependence on nonionic surfactant concentration even above the critical micelle concentration (cmc). Similarly, although the solid/water interfacial tension is observed to be constant, the equilib…
Swelling and gas release in a model ceramic system, ZnO, were studied under known internal and external pressures, oxygen partial pressures, and temperatures. When gas was not released, the instantaneous swelling strain rate was: εα( DF exp‐Q/RT) where DF is the instantaneous pressure driving force for swelling, Q = 1…
ABSTRACT Thermal degradation of N 5 methyltetrahydrofolic acid (N 5 MTHFA) under various conditions was studied, using a radioassay method to measure N 5 MTHFA concentrations. In the presence of an unlimited oxygen supply, the degradation reaction could be described as pseudo first order. Reaction rate constants were…
Abstract The kinetics and equilibria of SO 2 sorption in Kapton polyimide film have been measured at 25°C for pressures up to 58 cm Hg using a quartz spring balance. The observed equilibria are described well by the dual‐mode model for sorption of penetrants in glassy polymers. Observed hysteresis in sorption‐desorpti…