Showing papers in "Thermochimica Acta in 2004"

TL;DR: In this paper, the thermal decomposition of urea under open reaction vessel conditions by thermogravimetric analysis (TGA), high performance liquid chromatography (HPLC), Fourier transform-infrared (FT-IR), and an ammonium ion-selective electrode (ISE).

TL;DR: In this paper, a series of alkyl-imidazolium-treated montmorillonite clays were prepared and characterized by elemental analysis, thermogravimetry (TGA) and thermal desorption mass spectroscopy (TDMS).

TL;DR: In this paper, the authors showed that 1-butyl-3-methylimidazolium triflate was stable at 200°C and showed good wettability against aluminum oxide and silver at elevated temperatures.

TL;DR: The thermodynamic systematics of the formation and phase changes of a range of materials which form ionic liquids is examined, based upon experimental values of densities and calorimetric quantities.

TL;DR: In this article, the kinetics of pyrolysis of a micro-crystalline cellulose in nitrogen were studied from TGA and DTG data, obtained with two different modes of heating: a dynamic mode at constant heating rates between 1 and 11°C/min and an isothermal mode at various temperatures, kept constant between 280 and 320°C.

TL;DR: In this paper, the heat capacities of two different BaTiO3-based ceramic materials were determined as a function of temperature using differential scanning calorimetry (DSC), and the densities of these materials were measured at room temperature using Archimedes' principle.

TL;DR: In this article, a new system to measure enthalpies of sublimation by the drop method was designed, constructed and tested by measuring the enthalpy of ferrocene, benzoic acid and anthracene at different temperatures.

TL;DR: A critical appraisal of the recent literature concerned with the kinetics and the mechanisms of thermal reactions, particularly research using the methods of thermal analysis (TA) is made in this article, concluding that many features of the theories and the practices in customary use are inadequate and/or unsatisfactory.

TL;DR: In this paper, the pozzolanic activity of natural and artificial pozzolans used for preparation of restoration mortars was evaluated by using simultaneous differential thermal and thermogravimetric analysis (DTA/TG).

TL;DR: In this paper, a study aimed to monitor the composting process and evaluate the effectiveness of indicators able to define the stability of a compost obtained by mixing municipal solid waste (MSW) and vegetal waste, was conducted.

TL;DR: In this article, a combination of thermal analysis and Raman microscopy with the use of a thermal stage was used to transform natural calcium oxalate monohydrate known in mineralogy as whewellite.

TL;DR: In this paper, the thermal degradation behavior and thermal stability of epoxy-silica nanocomposites were studied with thermogravimetric analysis (TGA), and detailed and precise factors on the thermal stability based on the initial decomposition temperature (IDT), temperature of maximum rate of weight loss (T max ), and activation energy (E a ) of the decomposition reactions were studied.

TL;DR: In this paper, the effects of nucleating agents, i.e., sodium chloride, 1-octadecnol and paraffin, on the crystallization properties, morphology and dispersibility of microcapsules were investigated using SEM, DSC and XRD.

TL;DR: In this paper, the thermal decomposition of two zinc carbonate hydroxide samples up to 400 °C was studied using TGA, boat experiments and differential scanning calorimetry (DSC) measurements.

TL;DR: In this article, the electrical response of a quasi-adiabatic, thin-film nanocalorimeter system for the purpose of obtaining values of the heat capacity of ultra-thin samples is analyzed.

TL;DR: In this article, the effect of urea and n-propanol on circular dichroism and viscosity of purified type1 collagen solution at various temperatures and differential scanning calorimetry (DSC) of rat-tail tendon (RTT) collagen fibre have been studied.

TL;DR: In this article, the curing kinetics of lignin-phenol-formaldehyde (LPF) resol resins were studied by non-isothermal differential scanning calorimetry (DSC) at different heating rates.

TL;DR: In this article, the properties of 5-(phenylazo)-2-thiohydantoin (L 1 ) and 2-hydroxyphenylazo (2-THIOH 2-THIH 2 ) complexes were characterized by elemental analysis, conductivity, magnetic susceptibility, UV-Vis, IR, ESR and TG studies.

TL;DR: In this paper, a series of thermal analysis techniques, including dynamic mechanical analysis (DMA), TMA, and DSC, were used to characterize polarised and non-polarised polyvinylidene fluoride (PVDF) from the same batch.

TL;DR: The difference between the Rq/ R C O 2 ratio predicted from Thornton's rule and the actual measured ratio contains information on the rates of anaerobic reactions, which allows partitioning of the CO2 production rate between oxidative catabolism and anabolic reactions with ΔH ≈ 0.

TL;DR: The α-form of the biopolymer chitin, with particle sizes in the 80-200 mesh range, was deacetylated under hot alkaline conditions to yield chitosan as mentioned in this paper.

TL;DR: In this paper, the effect of thermal history on morphology, melting and crystallisation behavior of bacterial poly(3-hydoxybutyrate) (PHB) have been investigated by using differential scanning calorimetry (DSC), temperature modulated DSC (TMDSC) and hot stage optical microscopy (HSOM).

TL;DR: In this paper, the thermal degradation characteristics of pine needles and its kinetics were analyzed by using a thermogravimetric analyzer from room temperature to 900°C in air atmosphere at different heating rates, viz. 5, 10, 15, 25 and 30 Kmin −1.

TL;DR: In this paper, three zinc(II) pyridinecarboxylate complexes, namely [Zn(nicot)2(H2O)4], Zn(picol) 2(H 2O)2]·2H 2, Zn (dipicolH) 2]·3H 2 O, where nicot = nicotinate, picol = picolinate and dipicolH = hydrogenpicolinate were prepared and characterised by the methods of the thermal analysis (TG/DTG, DTA), infrared spect

TL;DR: In this article, the authors investigated the mechanisms for iron ore reduction in coal-ore mixtures using several advanced experimental techniques and provided a fundamental understanding for the direct reduced ironmaking processes.

TL;DR: For both organic liquids and solids, Entropies are reliably linearly correlated with volume per molecule, V m (nm 3 per molecule) (or molar volume, M / ρ (cm 3 ǫ −1 )) as mentioned in this paper.

TL;DR: In this paper, the assignment of the exothermic transition in DSC analysis of paper, flax and cotton and its components in order to understand their thermal behaviour in more detail and to evaluate the effect of the oxidation treatment on the thermal behaviour.

TL;DR: In this paper, a thermal conductivity gauge TCG-3880 (Xensor Integrations, NL) was used as a measuring cell for isothermal calorimetric measurements.

TL;DR: In this article, a new method to measure the wax content of crude oil has been developed by using differential scanning calorimetry (DSC), which can be applied to improve the accuracy in determining the amount of precipitated wax in a waxy crude oil at different temperatures.

TL;DR: In this paper, the evaporative properties of adipic acid, triethanolamine (TEA), and glycolic acid have been studied by thermal analysis Samples were heated in a simultaneous thermogravimetric-differential thermal analysis (TG-DTA) unit at 10°C/min −1 in a dry nitrogen atmosphere flowing at 100mL/min−1 Benzoic acid was used to calculate a calibration constant which could then be inserted into a modified Langmuir equation to calculate vapor pressure curves for adipic acids, TEA, and gly