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The alkaline activation of blast furnace slag promotes the formation of new cement materials. These materials have many advantages over ordinary Portland cement, including high strength, low production cost and good durability. However, many aspects of the chemistry of alkaline activated slags...
Carbon molecular sieves (CMS) were prepared from Greek lignite by a thermal treatment technique involving three sequential stages: carbonization, followed by activation with an oxidizing agent, and aperture modification by coke deposition. Adsorption of N 2 at 77 K and CO 2 at 298 K was used for...
The differential solubility of two poly(ethyleneterphthalate) (PET) fibres was determined in one thermally treated substrate and in another thermally untreated. In both cases, mixtures of phenol/tetrachloroethane with the appropriate composition were used. The non-dissolved fractions of the...
The thermal stability of p-cresol novolac resin was studied by means of DSC, X-ray diffraction, thermogravimetry and SEC investigations. After 30 thermal cycles in which the same sample was heated, cooled and heated again, without attainment of the temperature of degradation at any time in the...
DSC was used in order to evaluate the reactivity of cement raw meal. Two groups of samples were studied: five industrial raw meals for ordinary Portland cement production, with similar compositions, but differences in granulometry; and five industrial raw meals for white Portland cement...
The effects on the thermal properties and bioactivity of the substitution of CaO by La 2 O 3 , Y 2 O 3 and Al 2 O 3 in a glass of composition CaO·SiO 2 were studied and compared. The trivalent metal oxides were all effective in raising the glass transformation and softening temperatures when...
The thermal stabilities of two thermotropic liquid crystal polyesters were analysed by means of thermogravimetric analysis (TG), as a function of the chemical structure of the aliphatic spacer between the aromatic-triad mesogenic units. TG was combined with mass spectrometry to confirm that the...
Low-dose γ-radiation produces subtle effects on bovine γ-globulin, as revealed by calorimetric investigations carried out on concentrated aqueous solutions. The irradiation rate used seems below the threshold that allows complete protein denaturation; the denaturation temperature, T d ,...
The enthalpies of dilution of aqueous solutions of (Co(en) 3 )Cl 3 and (Co(tn) 3 Cl 3 (where en=1,2-diaminoethane, and tn=1,3-diaminopropane) were measured at 278.15 K up to 1 mol kg -1 , using a large isoperibolic calorimeter, with the 'long-jump' method. Relative apparent molar enthalpies, L Φ...
A localized-constant model involving two capacities reliably describes two injection calorimeters: a mass-variation calorimeter and a constant-volume calorimeter (TAM 2277 by Thermometric). The model distinguishes the place and the types of dissipation, and its parameters depend on the rates and...
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