Materials Literature
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Abstract When crystals of organic compounds are grown in the presence of growth inhibitors, there is a change in crystal morphology. A stereochemical correlation exists between the crystal structure, its modified morphology, and the molecular structure of the inhibitor. This correlation has been successfully exploited…
Results of using "ion thinning" techniques as final stage in the preparation of polished samples of portland cement clinker for SEM studies are showed. Under proper conditions, flat and clean surfaces are obtained which allow to discriminate textural facts (grain size, form, etc.), hardly to see on conventional polish…
In this work, and interpretation of results of the chemistry analisys of the I.R., I. L. and SO3 in portland cements, is presented.
This study, first part of a work where an account of the evolution of the mechanical resistances of various series of mortar and concrete tests submitted to the action of different agressive solutions will be given, sets up the chemical resistant behaviour of a sulphate resistant portland cement (with a content calcul…
The work have been carried out in two consecutive phases. Firstly the four wooden nave forms were sustituted by overdimensioned iron lattice girders that entered the aisles and ended in a capping hoop thus allowing the absorption of the pushes from the vaults that were ruining the church fabric. Besides a careful impe…
The Ca10(SiO4)3(SO4)3F2 is synthetized and the reflexions obtained by DRX are studied, comparing them with this registered in the J.C.P.D.S. file which corresponds to the same component. A new listing which includes 27 new reflexions is proposed. Some values of the reflexions given in the file 23-113 are modified as w…
This work, devoted to the First Consultation sponsored by ONUDI-UNCHS (HABITAT) relative to "Building Materials Industry", selects three different sides of it: the final version of the conclusions and recommendations prepared in Athens by the participants, the author personal answers, as a participant himself, to some…
Abstract Chemical analysis (including H 2 , F 2 , FeO, Fe 2 O 3 ) of a Mg‐vesuvianite from Georgetown, Calif., USA, yields a formula, Ca 18.92 Mg 1.88 Fe 3+ 0.40 Al 10.97 Si 17.81‐ O 69.0.1 (OH) 8.84 F 0.14 , in good agreement on a cation basis with the analysis reported by Pabst (1936). X‐ray and electron diffraction…
Abstract An electrically conductive plastic material was obtained by the electrochemical polymerization of pyrrole in a poly(vinyl chloride) matrix. The transmission electron microscopy shows that polypyrrole is uniformly distributed in the matrix. The conductivity of the composites fall in the range of 5 to 50 S/cm,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXPS study on surface and bulk palladium oxide, its thermal stability, and a comparison with other noble metal oxidesMarcell PeuckertCite this: J. Phys. Chem. 1985, 89, 12, 2481–2486Publication Date (Print):June 1, 1985Publication History Published online1 May 2002Published i…
Structural models previously proposed for metakaolinite are examined in light of the most recent published experimental data and new information obtained by solid‐state high resolution 29 Si and 27 AI NMR. A new model for metakaolinite is proposed, consisting of anhydrous regions of distorted AI‐0 tetrahedra containin…
The results of experimental studies of the crystal and domain structures of NaO, 5BiO, 5TiO3 as well as its lattice dynamics, dielectric, optical and other physical properties are considered. Nature of peculiar temperature points is discussed.
Abstract New measurements are presented for film height and pressure drop for vertical gas‐liquid annular flows. Improved methods for predicting the film height and interfacial friction factor are developed for situations in which the liquid film flow rate is known.
ADVERTISEMENT RETURN TO ISSUEPREVArticleThe nature of spin-state transitions in solid complexes of iron(II) and the interpretation of some associated phenomenaEdgar Konig, Gerhard Ritter, and S. K. KulshreshthaCite this: Chem. Rev. 1985, 85, 3, 219–234Publication Date (Print):June 1, 1985Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron-transfer reactions associated with host-guest complexation. Oxidation of ferrocenecarboxylic acid in the presence of .beta.-cyclodextrinTomokazu Matsue, Dennis H. Evans, Tetsuo Osa, and Nagao KobayashiCite this: J. Am. Chem. Soc. 1985, 107, 12, 3411–3417Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelationships between octanol-water partition coefficient and aqueous solubilityMichele M. Miller, Stanley P. Wasik, Guo Lan. Huang, Wan Ying. Shiu, and Donald. MackayCite this: Environ. Sci. Technol. 1985, 19, 6, 522–529Publication Date (Print):June 1, 1985Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShape of unperturbed linear polymers: polypropyleneDoros N. Theodorou and Ulrich W. SuterCite this: Macromolecules 1985, 18, 6, 1206–1214Publication Date (Print):June 1, 1985Publication History Published online1 May 2002Published inissue 1 June 1985https://pubs.acs.org/doi/1…
Phase changes and the microstructure resulting from low‐temperature annealing of yttria‐doped tetragonal ZrO 2 polycrystals in water were investigated at 65° to 120°C. Tetragonal ZrO 2 on the surface of the sintered body transformed to the monoclinic phase, accompanied by microcracking. The transformation rate in wate…