Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence behavior of europium complexes in sol-gel derived host materialsLowell Matthews, R. and Edward T. KnobbeCite this: Chem. Mater. 1993, 5, 12, 1697–1700Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 Decem…
A computational method was devised to explore the relationship of charge separation, geometry, molecular dipole moment (mu), polarizability (alpha), and hyperpolariz-abilities (beta, gamma) in conjugated organic molecules. We show that bond-length alternation (the average difference in length between single and double…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonlinear optical chromophores with large hyperpolarizabilities and enhanced thermal stabilitiesChristopher R. Moylan, Robert J. Twieg, Victor Y. Lee, Sally A. Swanson, Kathleen M. Betterton, and Robert D. MillerCite this: J. Am. Chem. Soc. 1993, 115, 26, 12599–12600Publicat…
A kinetic study of cement setting process is presented in this paper A new method which allows the microscopic research of the evolution of the cement hydration applied to the study of three P-350 cuban cements is used. The initial and final values of the specific surfaces of the hydration products and cement were obt…
There are numerous mechanisms that can lead to deterioration of portland-cement concrete in service. The best known are corrosion of reinforcement, freezing-thawing expansion, alkali-silica reaction, acid attack, and sulfate-related problems, including delayed ettringite formation. Additionally, concrete can deteriora…
La degradación del hormigón, debida a la reacción expansiva llamada "reacción álcali-árido", ha sido ampliamente estudiada (1) y (2). Este fenómeno es especialmente relevante en países como Estados Unidos, Canadá, Brasil, etc., donde hay una gran cantidad de áridos con sílice reactiva.
SUMMARY In this work we study the weathering resistance of samples of five types of stone used in Andalusian Cathedrals, treated with six water repellent products, by subjecting the samples to a SO2 polluted atmosphere. To evaluate the alteration of the samples, besides visual observation of macroscopic aspect, change…
Limestone filler addition to Portland cement does not only have an impact on the mechanical strength of mortars, but its action also alters their rheological values. Taking a Portland cement as the basic material and incorporating different calcareous filler portions from 0 to 50 %, standard mortars were prepared, det…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the tetrahedral sodium Na54+ cluster in zeolite XYang Kim, Young Wook Han, and Karl SeffCite this: J. Phys. Chem. 1993, 97, 49, 12663–12664Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993htt…
Abstract Dielectric relaxation and pyrocurrent of PVDF were studied by thermostimulated current spectroscopy. The transition spectrum of the material was investigated by differential scanning calorimetry. Two well‐resolved relaxation peaks have been observed in the temperature range [−100–100°C]. The molecular mechani…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupercritical fuel deposition mechanismsTim Edwards and Steven ZabarnickCite this: Ind. Eng. Chem. Res. 1993, 32, 12, 3117–3122Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993https://pubs.acs.org/doi/10.…
Microbial cells in natural environments are often encased in different types of exopolymer secretions (EPS), ranging from tight capsules surrounding individual cells to the looser slime matrices of biofilms. The different physical and chemical properties of exopolymers could have secondary effects on trophic interacti…
The first preparation of thin films of cellulose itself is reported. Cellulose exhibits excellent wetting behavior, is extremely stable against oxidation and other chemical degradation and in thin‐film form would have a number of applications. The method involves the preparation of LB films of trimethylcellulose (see…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyfuran: a new synthetic approach and electronic propertiesS. Glenis, M. Benz, E. LeGoff, J. L. Schindler, C. R. Kannewurf, and M. G. KanatzidisCite this: J. Am. Chem. Soc. 1993, 115, 26, 12519–12525Publication Date (Print):December 1, 1993Publication History Published onl…
MBe2BO3F2 (M=Na,K) have been discovered to be nonlinear optical (NLO) materials for UV applications. They have relatively large NLO coefficients: deff is about 2.5 times as large as that of KH2PO4 (λ=1079 nm, Nd:YAP laser), the UV cutoff wavelengths are as short as 155 nm, and they have a moderate birefringence of nea…
A simplified model of the gas-surface chemistry occurring during chemical-vapor deposition of diamond thin films is presented. The model results in simple scaling relations, useful for process scale-up and optimization, for growth rate and defect density in terms of the local chemical environment at the substrate. A s…
During the collapse of an initially spherical cavitation bubble near a rigid wall, a reentrant jet forms from the side of the bubble farthest from the wall. This re-entrant jet impacts and penetrates the bubble surface closest to the wall during the final stage of the collapse. In the present paper, this phenomenon is…