Materials Literature
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Dependent on the conditions, crystallisation of polymorphs from solvent may be under kinetic or thermodynamic control. In the latter case the nature of the solvent will be immaterial in respect of the polymorph produced. The conditions under which each of these factors may apply are analysed in detail. The transition…
Measurements of magnetoresistance and magnetization were carried out on ceramic samples of La0.5Pb0.5MnO3 and La0.5Pb0.5MnO3, containing 10 at. % Ag in a dispersed form. The results obtained for the resistivity at zero applied magnetic field exhibit a shallow minimum at the temperature T∼25–30 K which shifts towards l…
Mesoporous MCM-41 materials with a distinct N 2 -sorption hysteresis behavior have been prepared from pure silica and aluminosilicate−C 16 trimethylammonium (TMA)Br systems by a delayed neutralization procedure. On the basis of the analysis of transmission electron microscopy micrographs of these MCM-41 materials, we…
Dendrimers are large highly branched macromolecules synthesized from a polyfunctional core. They have shown a variety of biological properties, including, in some instances, antiviral activity. In this study, five dendrimers were evaluated for in vitro activity against herpes simplex virus (HSV) types 1 and 2 by cytop…
Silica-coated vesicles have been produced by the deposition of silica onto unilamellar vesicles from aqueous solution for the first time. The quaternary ammonium surface of the surfactant vesicles is receptive to silica and facilitates deposition of up to 5–10 nm of it. The “petrified” vesicles are stable to dehydrati…
Very long crystalline CdS nanowires (see Figure) are fabricated here via a polymer-controlled growth approach that involves distribution of Cd2+ ions in a polyacrylamide matrix followed by treatment with thiourea. It is shown that the polyacrylamide plays an important role in controlling the diameter and increasing th…
The incorporation of pozzolanic materials in the manufacturing of blended cement has a positive effect on the improvement of blended mortar and concretes performances. These active additions modify porous structure, impeding or delaying the access of aggressive solutions and, therefore materials more durable are possi…
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Infrared thermography is a very versatile non destructive technique which among other uses, can be applied to the study of moisture in buildings. However, this particular application can present some problems strictly related to the characteristics of the thermocamera device. In this case the available equipment works…
An exhaustive diagnosis of "anatomy, physiology and pathology" of the masonry body of the leaning Tower of Pisa has been carried out with the aim of integrate the knowledge of the structure features, mechanical conditions and decay processes of the building materials, necessary for correctly managing the therapy, temp…