Materials Literature
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Studies of the crystallization, melting, and morphology of random ethylene/1-octene copolymers by a combination of differential scanning calorimetry and atomic force microscopy are presented. Two different crystallization mechanisms prevalent in separate temperature ranges are inferred from the effect of cooling rate…
A model photosynthetic antenna consisting of four covalently linked zinc tetraarylporphyrins, (P ZP ) 3 −P ZC, has been joined to a free base porphyrin-fullerene artificial photosynthetic reaction center, P−C 60, to form a (P ZP ) 3 −P ZC −PC 60 hexad. As revealed by time-resolved absorption and emission studies, exci…
BWR and PWR cemented matrices to confine low and medium simulated liquid radioactive wastes have been submitted to the leaching process in de-ionized water at 20ºC and 40ºC, to obtain the medium leachability index (L) and the effective diffusion coefficient (De) of different ions. Otherwise, it has been studied the as…
The "Instituto de Ciencias de la Construcción" building is one of the most singular engineering design done by Eduardo Torroja: it was started in 1951. This study focused on the Institute façade-building materials has been carried out in the 100th anniversary of his birth. The analysis has revealed that the design of…
The historical heritage of our country is mainly made up of masonry, playing the sandstones an important role. However, because of the effect of environmental conditions and pollution, these materials can loose their cement, and eventually disintegrate. Chemical consolidants can be applied in order to prevent and stop…
A detailed study of the alteration causes in the stone material used in buildings and pavements from the ancient roman town of Baelo Claudia (Cádiz, South Spain) was carried out to establish their degree of conservation. Slabs from the pavement of the Forum showed in general a high and irreversible degree of degradati…
The kinetics of formation of disordered arrays of hemispherically shaped islands of cesium chloride on an oxidized silicon wafer, starting from a deposited thin film of CsCl, has been investigated. The essential process step is the exposure of the CsCl thin film to water vapor. Transport of dissolved material in the a…
Summary Subantarctica is situated between the Antarctic and the Subtropical Convergence and consists of the islands in the southern Atlantic, Indian and Pacific Oceans. Diatoms are an important component of all Subantarctic aquatic, moss and soil habitats. Taxonomic studies reveal a high diversity and species richness…
The spherically averaged structure function $S(|\mathbf{q}|)$ obtained from pulsed neutron powder diffraction contains both elastic and inelastic scattering via an integral over energy. The Fourier transformation of $S(|\mathbf{q}|)$ to real space, as is done in the pair density function (PDF) analysis, regularizes th…
The Mayer diagrammatic expansion for a classical pair-interacting fluid in thermal equilibrium is cast in a form particularly appropriate to high-dimensional space. At asymptotically high dimensionality, the series, when it converges, is dominated by a single term. Focusing upon repulsive interactions, the dominant te…
Abstract Infrared reflectance spectra of Li-, Na-, K-, Rb- and Cs-saturated samples of montmorillonite Zenith-N (Milos, Greece) have been measured in the 400–1300 cm -1 region in an attempt to elucidate the behaviour and migration properties of alkali cations after heating the montmorillonites at 300°C for 24 h. Decon…
Flexible metallic plastic sheets and filmsof two high-strength conducting polymers, polythiophene and poly(p-phenylene), are discussed. The synthetic procedure—electropolymerization in boron trifluoride diethyl etherate solution—is believed to be the key to the exceptional mechanical properties of these materials, whi…
Columnar and highly oriented (100) BaTiO 3 and SrTiO 3 thin films were prepared by a chelate‐type chemical solution deposition (CSD) process by manipulation of film deposition conditions and seeded growth techniques. Randomly oriented columnar films were prepared on platinum‐coated Si substrates by a multilayering pro…
Este trabalho objetivou estudar a relação entre os constituintes mineralógicos da fração argila e o desenvolvimento da micro e macroestrutura de Latossolos do sudeste brasileiro. Para tanto, foram obtidas amostras do horizonte B de sete Latossolos, representativos deste grupamento, ocorrentes nos estados de Minas Gera…
The structure and chemistry of what initially was proposed to be Ti 3 Al 2 N 2 are incorrect. Using high‐resolution transmission electron microscopy, together with chemical analysis, the stoichiometry of this compound is concluded to be Ti 4 AlN 3‐delta (where delta = 0.1). The structure is layered, wherein every four…
Many commercial products change color with a change of temperature. How do they do it? The processes responsible for the two major categories of commercial thermochromic coloring agents are presented, along with a description of applications of thermochromic materials.