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Showing papers in "Thermochimica Acta in 2001"


Journal ArticleDOI
TL;DR: In this paper, the effect of chemical variation (alkyl chain length, number of alkyls, and unsaturation) of organic modifiers on the thermal stability of the organically exchanged montmorillonite are discussed.

320 citations


Journal ArticleDOI
TL;DR: A review of the literature concerning the thermal properties of natural and semisynthetic cyclodextrins and their inclusion compounds can be found in this article, where the limitations and advantages of the applications of thermal analyses concerning water- and drug-cyclodextrin interactions are also discussed.

281 citations


Journal ArticleDOI
TL;DR: The hydroxyl group content in nine different types of silicas was determined by thermogravimetry (TG) as mentioned in this paper, which was performed by heating the silica samples at a rate of 5°Cmin−1 from room temperature to 1250°C in an argon flow.

219 citations


Journal ArticleDOI
TL;DR: In this paper, the authors evaluated three thermal methods of fragility prediction and, using these methods, to predict the fragility of a number of pharmaceutical glass-formers using differential scanning calorimetry.

197 citations


Journal ArticleDOI
TL;DR: In this article, bitumen microstructure was analysed by modulated differential scanning calorimetry (MDSC) and it was calculated that the relative size of the bitumen repeat unit is between 36 and 91 grams of bitumen.

175 citations


Journal ArticleDOI
TL;DR: In this article, a method for measuring the vapor pressures of a wide range of materials using a conventional thermobalance and standard sample holders is described, which is calibrated using pure reference materials of known vapor pressure and exploiting the relationship between volatilization rate and vapor pressure based on the Langmuir equation for free evaporation.

158 citations


Journal ArticleDOI
TL;DR: In this paper, the status of temperature-modulated differential scanning calorimetry is reviewed, including current methods of data analysis, and experimental conditions and calibrations necessary for meaningful data interpretation.

145 citations


Journal ArticleDOI
TL;DR: Differential scanning calorimetry (DSC) was used to study the melting process of three pure fatty acids (palmitic, stearic and oleic) and both their binary and ternary mixtures as discussed by the authors.

141 citations


Journal ArticleDOI
TL;DR: In this article, the use of differential scanning calorimetry (DSC) to characterize the molecular mobility of amorphous pharmaceutical materials is reviewed, and several applications of the data for the qualitative and quantitative prediction of their performance are presented.

138 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of temperature on stoichiometry, morphology and crystallinity of hydroxyapatite (HA) prepared from calcium hydroxide and phosphoric acid was investigated.

135 citations


Journal ArticleDOI
TL;DR: In this paper, the glass transition, crystallisation and melting behaviour of erythritol, xylitol, and glucitol were investigated using dielectric analysis (DEA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA).

Journal ArticleDOI
TL;DR: In this article, the authors present a derivation of the linear heating Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation for a constant nucleation rate and diffusion-controlled growth, in the hard impingement approximation.

Journal ArticleDOI
TL;DR: In this paper, the effect of two antioxidants, α-tocopherol, ascorbyl palmitate, citric acid and ascorbic acid, and ethoxylated ethylene glycol on the oxidative stability of linseed oil was studied.

Journal ArticleDOI
TL;DR: In this paper, the simplex method of the proximate analysis of coal and biomass by thermogravimetry analysis (TGA) is reported, where the response function used was chosen to minimize the difference in percentage of volatile matter with the ASTM characterization.

Journal ArticleDOI
TL;DR: In this article, a series of dialdehyde cellulose samples with varied aldehyde content were prepared, and they were further converted to nitrogen-containing derivatives by Schiff base reaction with hydroxylamine or hydrazine.

Journal ArticleDOI
TL;DR: In this article, composites made from an unsaturated polyester/styrene thermoset matrix and maleic anhydride esterified woodflour have been prepared and tested.

Journal ArticleDOI
TL;DR: In this paper, two endothermic transitions at 74 and 90°C, respectively, were observed during differential scanning calorimetry of glassy itraconazole, and they were not due to impurities in the starting material, nor are they caused by thermal decomposition.

Journal ArticleDOI
TL;DR: In this paper, the authors apply the physical approach to the interpretation of the exponential dependence of the rate of heterogeneous reactions on temperature proposed by Hertz and Langmuir and developed by the author as an alternative to the traditional chemical approach based on the Arrhenius concept of activation effect.

Journal ArticleDOI
TL;DR: In this article, an iterative procedure has been established after the ratios, H ( x ) and h ( x ), were introduced to determine the exact value of activation energy of a reaction instead of the approximate values of p( x ) used in conventional isoconversional plots.

Journal ArticleDOI
TL;DR: The phase change behavior of organic and inorganic phase change materials, namely paraffin wax, microcrystalline wax, Na2SO4·10H2O and CaCl2·6H 2O, with melting temperatures close to room temperature, was evaluated by differential scanning calorimetry as discussed by the authors.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the thermal analysis of basic magnesium carbonate in nitrogen, carbon dioxide and air at different heating rates and the origin of the exothermic peak was studied.

Journal ArticleDOI
TL;DR: The thermal oxidation of covellite of particle size 45-90mm was studied by heating 5-6mg samples at 20°Cmin −1 in dry air in a simultaneous thermogravimetry-differential thermal analysis (TG-DTA) apparatus.

Journal ArticleDOI
TL;DR: The solid-liquid phase transition of fatty acids is related to intermolecular hydrogen bonds in binary systems with Δ H values of 0.84±0.71°C as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this paper, strong and weak acid Lewis acid sites were assigned to extra-framework alumina (EFAl) species generated by the partial dehydroxylation of H-zeolites.

Journal ArticleDOI
TL;DR: In this article, the authors examined the reaction of three tetrafunctional epoxy resins in the presence of tetraethylene tetramine at different heating rates and determined the kinetic parameters of the curing reaction using various computational methods (Barrett, Borchardt-Daniels and Kissinger).

Journal ArticleDOI
TL;DR: The enthalpies of formation of the lanthanide sesquioxides have been evaluated from the experimental data available in literature as mentioned in this paper, and all experimental results have been re-calculated to obtain a consistent set of data compatible with the assessed values for the aqueous lanthanides trivalent ions, as reported previously.

Journal ArticleDOI
TL;DR: In this article, the room temperature adsorption of CO2 on pure and sulphated tetragonal ZrO2 (t-ZrO 2) was studied, in order to assess how and to what extent the acid-base properties of ZRO2 are modified by the presence of surface sulphate groups.

Journal ArticleDOI
TL;DR: In this article, a non-Arrhenius temperature dependence of the relaxation time is introduced to describe results from temperature-modulated DSC (TMDSC) measurements in polystyrene.

Journal ArticleDOI
TL;DR: The thermal behavior of nicotinamide was investigated by differential scanning calorimetry (DSC) in this article, where it was heated to 140°C, cooled and subsequently re-heated using DSC.

Journal ArticleDOI
TL;DR: In this paper, the thermal behavior of ammonium acetate, nitrate and chloride was investigated, and the dependence of Gibbs free energy of activation on decomposition temperature was calculated.