Materials Literature
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This article studies the effects produced by the lime filler on the Portugal cement used with additions in the production of mortars. The starting point is a Portland cement to which different ratios of lime filler, ranging from 0-50%, are added. The next step consists of preparing mortar specimens using standardized…
The chemical composition of the different types of granite employed in the Cathedral and buildings of historic and artistic interest in Avila (Spain) is studied. The differences among the various fades studied (grey, ochre and bloodstone granites) are explained in terms of their different mineralogical composition, a…
Poly(4‐anilino‐1‐butanesulfonic acid) sodium salt was synthesized from the electrochemical oxidation of 4‐anilino‐1‐butanesulfonic acid sodium salt, which was readily obtained from aniline and 1,4‐butane sultone. The resulting water‐soluble polymer has shown much higher redox cyclability than unsubstituted polyaniline…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocatalytic Reduction of Carbon Dioxide on p-Type CaFe2O4 PowderYasumichi Matsumoto, Michio Obata, and Jukichi HomboCite this: J. Phys. Chem. 1994, 98, 11, 2950–2951Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 Mar…
Thermochromic VO 2 films were deposited on substrates of silicon and Pyrex glass by reactive rf magnetron sputtering and characterized by thin-film X-ray diffraction (XRD), Rutherford backscattering spectrometry (RBS), atomic force microscopy (AFM) and spectrophotometry. Films with a VO 2 single phase were formed abov…
The flow properties of a suspension of 146 nm diameter charge, stabilized particles at a volume fraction of 0.33 are detailed, and links are made with small-angle neutron scattering structure determinations. At rest the suspension is ordered, having hexagonally close-packed planes lying parallel to the rheometer wall…
XPS techniques are used for a comparative study of ion induced effects in simple oxides (ZrO2, SiO2, TiO2) and complex oxides (ZrSiO4, CaTiSiO5, La2TiO5, PbTiO3). We have found that reduction effects in simple and complex oxides differ. The interpretation of altered layer composition has been qualitatively considered…
Abstract The problem of predicting nonisothermal crystallization kinetics based on isothermal data is considered, with reference to the difficulties involved, both experimental and theoretical. The kinetic model used is the differential form of the Nakamura equation which is an extension of the Avrami equation so as t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Platinum Supported on Pregraphitized Carbon BlacksF. Coloma, A. Sepulveda-Escribano, J. L. G. Fierro, and F. Rodriguez-ReinosoCite this: Langmuir 1994, 10, 3, 750–755Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published…
Abstract A major stream of post‐consumer plastics is a commingled blend of polyethylenes and polypropylenes, which usually exhibits lower performance compared with that of the homopolymers due to the incompatible nature of polyethylenes and polypropylenes. Various studies have been carried out to characterize the stru…
The breakdown of native and anodically grown oxide films on Ti electrodes is investigated by scanning electrochemical microscopy (SECM), video microscopy, transmission electron microscopy, and voltammetry. SECM is used to demonstrate that the oxidation of Br − on Ti occurs at microscopic surface sites (10 to 50 μm dia…
The oxidation kinetics of chemically vapor‐deposited SiC in dry oxygen and wet oxygen ( P H2O = 0.1 atm) at temperatures between 1200° and 1400°C were monitored using thermogravimetric analysis. It was found that in a clean environment, 10% water vapor enhanced the oxidation kinetics of SiC only very slightly compared…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of Tetravalent Cerium upon Coordination of Unsaturated Heteropolytungstate AnionsNobuyuki Haraguchi, Yoshihiro Okaue, Toshiyuki Isobe, and Yoshihisa MatsudaCite this: Inorg. Chem. 1994, 33, 6, 1015–1020Publication Date (Print):March 1, 1994Publication History P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThin Palladium Membrane Formed in Support Pores by Metal-Organic Chemical Vapor Deposition Method and Application to Hydrogen SeparationShengchun Yan, Hideaki Maeda, Katsuki Kusakabe, and Shigeharu MorookaCite this: Ind. Eng. Chem. Res. 1994, 33, 3, 616–622Publication Date (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT31P and 183W NMR Spectroscopic Evidence for Novel Peroxo Species in the "H3[PW12O40].cntdot.yH2O/H2O2" System. Synthesis and X-ray Structure of Tetrabutylammonium (.mu.-Hydrogen phosphato)bis(.mu.-peroxo)bis(oxoperoxotungstate) (2-): A Catalyst of Olefin Epoxidation in a Bip…
Abstract The water vapor permeability (WVP) of whey protein emulsion films was investigated. The exponential effect of relative humidity on the WVP of whey protein films was reduced through lipid incorporation. Film orientation had a significant effect on WVP due to emulsion separation during film formation. Heat dena…
It has been suggested that optimizing the first hyperpolarizability, β, of donor-acceptor compounds requires a specific donor-acceptor strength for a given conjugated bridge. For donor-acceptor polyenes, β can be maximized when an optimal degree of mixing between neutral and charge-separated canonical resonance forms…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLayered Materials by Molecular Design: Structural Enforcement by Hydrogen Bonding in Guanidinium Alkane- and ArenesulfonatesVictoria A. Russell, Margaret C. Etter, and Michael D. WardCite this: J. Am. Chem. Soc. 1994, 116, 5, 1941–1952Publication Date (Print):March 1, 1994Pu…
ABSTRACT Clay mineral crystallinity and crystallite (domain) size data determined by X‐ray diffraction (XRD) are methods extensively used in the characterization of very low‐grade metamorphic conditions. However, the lack of sufficient interlaboratory standardization has made comparisons between different research gro…