Search Results

You are looking at 21 - 30 of 183 items for :

  • "TG–DTG–DTA" x
  • Refine by Access: All Content x
Clear All

buildings ( Fig. 1 ). The samples cover all the types of tobacco pipes from the above mentioned excavation from the archaeological department team of Cyprus. These samples were analyzed by ICP-AES, thermogravimetric-differential thermal analysis (TG/DTG-DTA

Restricted access

important scope of the present paper was the study of the thermal properties of the two cationic [Cu 2 (dmpymtH) 6 ] 2+ 2X − complexes (X = Cl, Br), by using the simultaneous TG/DTG–DTA technique in inert and oxidative atmospheres. Powder XRD was used for

Restricted access

( 2a —foot; 2b —cap); and Lactarius deterrimus ( 3 —cap). Thus, the TG–DTG–DTA curves are indicative of a complex thermal degradation mechanism which is specific to each species under study [ 10 – 14 ]. A similar degradation mechanism is

Restricted access

to get information on possible drug–excipient interactions. Therefore, the application of hyphenated techniques like TG/DTG/DTA/EGA/UATR is of great importance in solving pharmaceuticals problems such these mentioned before. The evaluation of

Restricted access

TG/DTG, DTA, in situ FTIR, and XRD. The decomposition intermediates are specially attended in this work so that complete mechanism and course of the thermal decomposition of CuAc 2 ·H 2 O in air can be propounded and discussed

Restricted access

Abstract

Over the past years, the production of biodiesel has significantly increased in Brazil due to its obligatory use in the composition of diesel for vehicle use. As a result, in the most ordinary processes, a hundred thousand tons of glycerol is produced as by-product per 1 billion liters of biodiesel. Glycerol has already been widely studied. Nonetheless, the quantity produced today demands new proposals for uses, such as a fuel. In this aim, the authors studied the kinetics of the thermal processing of glycerol. In this research, thermogravimetry (TG), derivative thermogravimetry (DTG), and differential thermal analysis (DTA) were used to provide the experimental data. Kinetic parameters were calculated by Kissinger method for the global process observed during the heating of the samples from the room temperature up to 600 °C, both in open and in sealed crucibles (with a little hole). Kinetic data were also determined at different isoconversion conditions during heating, by applying Ozawa–Flynn–Wall and Blazejowski methods to TG data. Results show that glycerol heated from 30 to 600 °C, under normal pressure, does not experience simple volatilization. The activation energies calculated at different conversion degrees by these methods show that only volatilization occurs when the mass loss of glycerol is lower than 40% and that for higher conversion degrees, partial thermal decomposition and/or dissociation of glycerol are occurring as well. These facts are also confirmed by the volatilization enthalpies estimated using another method developed by Blazejowski based on Van’t Hoff equation.

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: Corina Duda-Seiman, T. Vlase, Gabriela Vlase, Rodica Cinca, Mariana Anghel, and N. Doca

were prepared by gently mixing at room temperature using agate mortar. The TG/DTG/DTA measurements were carried out on a Perkin Elmer Diamond device, in dynamic air, respectively, nitrogen (100 mL min −1 ) at heating rates of 7, 10, 12, and 15

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: Maria Lalia-Kantouri, Maria Gdaniec, Agnieszka Czapik, Konstantinos Chrissafis, Wieslawa Ferenc, Jan Sarzynski, and Christos D. Papadopoulos

constituent atoms was calculated by the use of Pascal's constants [ 17 ]. The simultaneous TG/DTG-DTA curves were obtained on a SETARAM thermal analyser, model SETΑRAM SETSYS TG-DTA 16/18. Samples (6.0 ± 0.2 mg) were placed in alumina crucibles, and

Restricted access

Solid, primary aliphatic amine complexes of transition-metal halides

I. Thermal studies on RNH2 complexes of nickel(II) chloride withR=H, CH3, CH3CH2, CH3(CH2)2, (CH3)2CH, CH3(CH2)3, (CH3)2CHCH2

Journal of Thermal Analysis and Calorimetry
Authors: G. Kenessey and G. Liptay

The thermal decomposition characteristics of the ternary mixed, solid, primary aliphatic amine complexes formed with nickel(II) chloride was investigated by a simultaneous TG-DTG-DTA method.

Restricted access

analysis (TG-DTG-DTA), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform-infrared (FT-IR) spectroscopy. The non-isothermal kinetics analysis for the dehydration step of the aluminum phosphate was carried out using the

Restricted access