Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of some phenolic antioxidantsAnwar A. Hamama and Wassef W. NawarCite this: J. Agric. Food Chem. 1991, 39, 6, 1063–1069Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://pubs.acs.org/do…
Ten dental casting alloys were tested for alloy-element release into cell-culture medium, and this release was related to alloy composition, alloy microstructure, and alloy cytotoxicity (previously determined). Cell-culture medium was analyzed for alloy elements by flame atomic absorption. Concentrations of elements i…
Grain growth in a high‐purity ZnO with systematic additions of Sb 2 O 3 from 0.29 to 2.38 wt% was studied for sintering in air from 1106° to 1400°C. The results are discussed and compared with previous studies of pure ZnO and ZnO with Bi 2 O 3 additions in terms of the kinetic grain growth expression: G n – G n 0 = K…
The sintering of zinc oxide powder compacts has been investigated at constant rates of heating of 0.5° to 15°C/min. For samples with the same initial relative density (0.50), the temperature derivative of the densification strain versus density fits within a single, relatively narrow band. At low temperatures the dens…
Studies with 20 soils containing from 7 to 204 g kg‐1 total carbon and from 0.5 to 16.9 g kg‐1 total nitrogen indicated that the Leco CR‐12 Carbon Determinator and the Leco CHN‐600 Elemental Analyzer are satisfactory for routine analysis of soils for total carbon and that the Leco CHN‐600 Elemental Analyzer is also sa…
Abstract The basal spacing of a set of smectites, with layer charges between 0.74 and 1.14 electrons per unit cell, have been measured while the smectites were in equilibrium with NaCl solutions having concentrations of 0.25 to 2.5 molal. Except for the most highly charged smectites, an expansion from ~15.5 to ~18.5 Å…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the linear trinuclear complex hexakis(acetato)bis(2,2'-bipyridine)trimanganese (II). Determination of the J electron-exchange parameter through magnetic susceptibility and high-field magnetization measurementsS. Menage, S. E. Vitols, P. Bergerat, E. Codjovi, O.…
Pyroelectric detectors offer major advantages in terms of cost and ease-of-operation over cooled photon detectors of long wavelength infra-red radiation. This paper reviews the requirements of a pyroelectric material to maximise its effectiveness in different types of detector and compares the properties of ferroelect…
Lead zirconate titanate (PZT) thin films with a composition near the morphotropic phase boundary (Zr/Ti = 53/47) were fabricated by spin deposition of an alkoxide‐derived solution and annealed at 650°C for 30 min. A complex microstructure is observed in which micrometer‐scale rosettes of the desired perovskite phase a…
SUMMARY The environmental scanning electron microscope (ESEM) allows the examination of specimens in a gaseous environment. It is based on an integration of efficient differential pumping with a new design of electron optics and detection systems. Backscattered, cathodoluminescence and X‐ray detectors can be designed…
A detailed thermodynamical analysis of commensurate and incommensurate magnetic phases in localized magnetic systems within a mean-field theory is presented. Interesting results are obtained concerning the specific heat of amplitude-modulated magnetic structures: In particular, the specific-heat discontinuity at the o…
Monte Carlo computer simulation has been used to study water confined between the layers of 2:1 clay minerals. The model systems are based on natural Mg and Na smectites. The simulation cells contain one clay layer, 64 water molecules and four magnesium or eight sodium interlayer cations. These atoms and molecules int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew synthetic route to the hydridospherosiloxanes Oh-H8Si8O12 and D5h-H10Si10O15Pradyot A. AgaskarCite this: Inorg. Chem. 1991, 30, 13, 2707–2708Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://pubs.acs.o…
There is an hypothesis that the mechanism o f gypsum hydration and dehydration is performed through two simultaneous phenomena. In this study we try to clear up this phenomenon using chlorides as accelerators or a mixture of ethanol-methanol as retarders to carry out the gypsum setting. Natural Mexican gypsum samples…
The petrographical description and the values of some physical properties of three rocks used in the Architectonic Heritage of Catalonia (Spain) are presented. These rocks are known, in the field of the "building stones" as Sant Vicenç, El Figueró and Manresa stones. By means of accelerated ageing tests, their durabil…
The prevailing winds in the area, associated with an important rising damp are the main natural factors of deterioration that affect the Cathedral of Almería. Certain unfortunate maintenance Jobs carried out as well as the bombardments and machine-gunning on the building during the Civil War can be indicated as anthro…