Cemento aluminoso: cómo evitar la pérdida de las resistencias mecánicas
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Corrosion behaviour of steel during accelerated carbonation of solutions which simulate the pore concrete solution
In spite of the numerous studies carried out on carbonation of the concrete, very few data have been published on the mechanism of steel depassivation and the corrosion rates involved in this type of phenomenon. Also some uncertainties remain as to the chemical composition of the pore solution of a carbonated concrete…
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Revisión crítica del ensayo de cristalización de sales
The salt crystallisation test is, for its simplicity and aggressivity, one of the most suitable ageing tests to evaluate the durability of rock materials. However the results of this test could be conditioned by differences in their experimental procedure. In this article the principal variables involved in the salt c…
Nonuniform classical fluid at high dimensionality
We investigate the existence of nonuniform thermodynamic states of classical fluids with purely repulsive finite-range interaction, such as that of hard spheres. Both free energy and nonuniform profile are obtained in the strict limit of an infinitely large spatial dimension. We establish the density at which the unif…
Effect of Saturating Cation, pH, and Aluminum and Iron Oxide on the Flocculation of Kaolinite and Montmorillonite
Abstract The effect of pH on the flocculation-dispersion behavior of noncrystalline aluminum and iron oxides, kaolinite, montmorillonite, and various mixtures of these materials was investigated. The clays were Na- or Ca-saturated and freeze-dried before use. Critical coagulation concentrations (CCC) of all materials…
Structure and related properties of solution-cast perfluorosulfonated ionomer films
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and related properties of solution-cast perfluorosulfonated ionomer filmsGerard Gebel, Pierre Aldebert, and Michel PineriCite this: Macromolecules 1987, 20, 6, 1425–1428Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Published ini…
Double-melting behavior of poly(ether ether ketone)
The melting behavior of semicrystalline poly(ether-ether-ketone) (PEEK) has been studied using differential scanning calorimetry (DSC). When cold-crystallized from the amorphous glassy state at high supercooling or when melt-crystallized at low supercooling, PEEK usually shows two melting peaks. This double melting be…
Muscovite dehydroxylation; high-temperature studies
Ansl:n.Lcr Unit-cell dimensions of muscovite-2M, from the Diamond mine, South Dakota, were determined to 1000'C, single-crystal X-ray structural refinements were made at 20'C and 300'C, and additional structural refinements at 20, 525. and 650'C were made on similar material from Panasqueira, Portugal. Single-crystal…
Weathering of Basalt: Changes in Rock Chemistry and Mineralogy
Abstract The weathering of eastern Australian basalts, sampled from the rounded, hard, core-stone to the rind of softer weathered material, has been examined by bulk chemical analyses, thin section petrography, electron microprobe, and X-ray powder diffraction analyses. Using density as a measure of weathering intensi…
Computer derivation of the symmetry elements implied in a structure description
The space-group symmetry implied in the atomic coordinates of a structure can be reconstructed by deriving the metric symmetry elements of the lattice from the cell data, and finding the location and the glide for corresponding space-group symmetry elements with the same orientation using the list of atomic coordinate…
Chemically modified collagen: A natural biomaterial for tissue replacement
Glutaraldehyde crosslinking of native or reconstituted collagen fibrils and tissues rich in collagen significantly reduces biodegradation. Other aldehydes are less efficient than glutaraldehyde in generating chemically, biologically, and thermally stable crosslinks. Tissues crosslinked with glutaraldehyde retain many…
Nd–Fe–B Permanent Magnet Materials
A comprehensive review of the Nd–Fe–B permanent magnet material is given. A historical survey, the basic magnetic properties of Nd 2 Fe 14 B and isomorphous compounds, a phase diagram for the ternary Nd–Fe–B system, processing techniques and magnetic properties of sintered Nd–Fe–B magnets, and the future directions fo…
Determination of ion populations and solvent content as functions of redox state and pH in polyaniline
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of ion populations and solvent content as functions of redox state and pH in polyanilineDuke Orata and Daniel A. ButtryCite this: J. Am. Chem. Soc. 1987, 109, 12, 3574–3581Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Publis…
Second-order nonlinear-optical processes in orientationally ordered materials: relationship between molecular and macroscopic properties
Liquid crystals and polymer glasses can be formed into orientationally ordered materials by raising the temperature of the material to a temperature at which molecular motion is greatly enhanced, applying an external aligning field, and then cooling with the field applied. The resulting material exhibits second-order…
Heterogeneous Catalysis by Heteropoly Compounds of Molybdenum and Tungsten
Heteropolyanions are polymeric oxoanions which are formed by the condensation of more than two different oxoanions [Eq. (1)l. Polyanions consisting of one kind of oxoanion are called isopolyanions [Eq. (2)]. Acidic elements such as Mo, W, V, Nb, and Ta are present as oxoanions in aqueous solutions and polymerize to fo…
Structural-electronic relationships in inorganic solids: powder neutron diffraction studies of the rutile and anatase polymorphs of titanium dioxide at 15 and 295 K
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural-electronic relationships in inorganic solids: powder neutron diffraction studies of the rutile and anatase polymorphs of titanium dioxide at 15 and 295 KJeremy K. Burdett, Timothy Hughbanks, Gordon J. Miller, James W. Richardson Jr., and Joseph V. SmithCite this:…
Thermal Polymerisation and Oligomerisation of Monomers
Two competing types of thermal reactions of monomers of different classes, namely oligomerisation and polymerisation, are examined. The characteristics of the formation of the initiating radicals and of low-molecular-weight products (dimers and trimers) and of the inhibition of the thermal polymerisation by radical ac…
Disclinations in Quasicrystals
The most significant feature in the transition from the quasicrystalline to the amorphous state is the loss of long-range bond-orientational order. Disclinations are candidates for elementary excitations which destroy angular correlations. Generalizing the topological defect classification, we investigate point singul…