Materials Literature
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We describe a new method for the determination of the composition of Portland cement mixtures with active additions and the identification of the type of addition. This method enables us to classify a Portland cement or Portland with active additions, whatever this addition may be, and it is specially suitable for dis…
Infrared spectroscopy is a very useful technique in Cement Chemistry. This work is devoted to the study of a large number of sulphates that should have an incidence in false set phenomena, and they are qualitative and semi-quantitatlvely studied when they are in some degree in the clinker or in the portland cement.
Abstract The analysis of low velocity impacts is necessary for designing everything from safe automobiles to safe shipping casks for nuclear material. Although great strides have been made in reducing the cost of impact analysis, the cost must be reduced even more before impact analysis becomes a routine design tool.…
SUMMARY Frozen hydrated specimens of various latex spheres were used as well‐defined systems for the study of electron beam radiation damage to organic inclusions in vitreous, cubic and hexagonal ice. We found that radiolysis of organic material is modified by the presence of ice and that radiolysis in vitreous ice is…
Abstract A study has been made of the mechanical, thermal, and morpholigical characteristics of melt‐crystallized isotactic polypropylene containing high levels of the β or pseudohexagonal crystalline form. Different levels of β‐form crystallinity were produced in the polymer by blending in low levels of quinacridone…
Dipolar interactions between silver particles arranged on a square two-dimensional grating give rise to characteristic features in the wavelength dependence of surface-enhanced Raman scattering from adsorbed molecules. The interactions produce two pronounced effects: first, they shift and broaden the plasmon resonance…
An homogeneous stirred reactor designed for kinetic studies of hydrocarbon oxidation in the intermediate temperature range is described. The originality of this reactor lies in its ability to operate under pressure up to 10 atm ( approximately 1 MPa). The design of the injectors makes it possible to move a thermocoupl…
The chapter on thermophysical properties, curtailed from that in the first edition, should be different by giving uniformly the latest internationally-agreed property data and by giving information for modern materials: e.g., Table 65, reproduced from the 1950's, includes in its "selected nonmetals" none of the polyme…
The detrimental aging phenomenon observed in ZrO 2 ‐Y 2 O 3 materials, which causes tetragonal ZrO 2 to transform to its monoclinic structure at temperatures between 150 and 400°C, was investigated with respect to the gaseous aging environment and the Y 2 O 3 and SiO 2 content of the material. It is shown that the agi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in polymers. 2. Infrared temperature studies of nylon 11Daniel J. Skrovanek, Paul C. Painter, and Michael M. ColemanCite this: Macromolecules 1986, 19, 3, 699–705Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published in…
Examination of the porhyrins from the viewpoint of the “annulene chemist” has led to the discovery of the novel, simple porphin isomer porphycene 2. The path from conception to the synthesis of the molecule was surprisingly short. 2 is formed as a stable compound upon McMurry reaction of 1.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocalization of benzene in sodium-Y-zeolite by powder neutron diffractionA. N. Fitch, H. Jobic, and A. RenouprezCite this: J. Phys. Chem. 1986, 90, 7, 1311–1318Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986h…
The results are given of an investigation of the luminescence and stimulated emission spectra of powder phosphors of the Na 5 La 1- x Nd x (MoO 4 ) 4 composition prepared by the method of solidstate synthesis. Stimulated emission of neodymium was observed under the influence of strong pumping with laser pulses of 30-n…
The reaction of Dy2O3 or Tb4O7 with Nd15Fe77B8 powder during the sintering increases the coercivity of the sintered magnets. These oxides are reduced to metal during the sintering process, resulting in magnets with properties similar to those prepared from the Nd13.5Dy1.5Fe77B8 alloy.
The positions of atoms in icosahedral crystals are shown to correspond to arrangements of three-dimensional hypersurfaces in six-dimensional periodic lattices. The six-dimensional space-group symmetry allows for crystals which cannot be formed by space-filling decorated tilings (quasicrystals). Structures with continu…
Volume 1 of this outstanding resource concentrates on safety and environmental concerns in the manufacture and use of resins, and thoroughly discusses theories of degradation, plasticization, solvation, and stabilization.
Abstract The rotating bed plasma reactor described here permits uniform surface modification of relatively large amounts of powder materials. Scale‐up to even larger batches of solids appears to be feasible. Some preliminary experimental data on the plasma surface modification of polymer powders have been presented. T…
Calculations are presented for the collective plasmon modes of a superlattice consisting of two-dimensional electron gas layers separated by media of alternating thickness and/or dielectric constant. The theory is developed for bulk plasmon modes in an infinite superlattice, and for bulk and surface modes in a semi-in…
Abstract Blending of nylon‐6 and nylon‐66 was carried out by coextrusion in the whole range of compositions with particular emphasis on small amounts of one polymer in the other. Most significant improvement in properties is achieved at low blend compositions in which the minor component remains amorphous while severe…