Authors:D. Wyrzykowski, E. Hebanowska, G. Nowak-Wiczk, M. Makowski, and L. Chmurzyński
broader characteristics of its thermalbehaviour. To be able to do this, we have examined the intermediate dehydration products of the acid, trans -aconitic acid ( trans -propene-1,2,3-tricarboxylic acid) and its cis -isomer, cis -propene-1
Authors:Concepción Foces-Foces, María Victoria Roux, Rafael Notario, and Marta Segura
The aim of this work is to study the thermalbehavior in the medium–high temperature range of the sulfur containing amino acid l -cysteine and its corresponding dimer l -cystine, which is composed of two l
Authors:Anikó Kovács, Katalin Badakné Kerti, and László Somogyi
Excessive consumption of added sugar is associated with many health problems, for example obesity, type 2 diabetes, etc. Hence there is an urgent need for the product reformulation by total replacement or partial reduction of sugar in food industry. The aim of this research was to study the effect of sugar substitution (by stevia and xylitol) on model confectionary systems. We investigated differences in the texture properties, the viscosity and thermal properties of the blends. Based on our results, the sugar substitution affects the physical properties of the measured samples. The apparent viscosity and the texture properties were changed due to the different dry matter content in the samples. In the differential scanning calorimeter (DSC) curves the different melting of the samples were expressed according to the changes in sugar content. Further work is needed in this field to follow up the discovered changes in thermal behaviour of these mixtures.
Authors:A. Czylkowska, D. Czakis-Sulikowska, A. Kaczmarek, and M. Markiewicz
A novel mixed-ligand complexes with empirical formulae: Ln(4-bpy)1.5(CCl3COO)3·nH2O (where Ln(III) = Pr, Sm, Eu, Gd, Tb; n = 1 for Pr, Sm, Eu and n = 3 for Gd, Tb; 4-bpy = 4,4′-bipyridine) were prepared and characterized by chemical, elemental analysis and IR spectroscopy. Conductivity studies (in methanol, dimethylformamide and dimethylsulfoxide) were also described. All complexes are crystalline. The way of metal–ligand coordination was discussed. The thermal properties of complexes in the solid state were studied under non-isothermal conditions in air atmosphere. During heating the complexes decompose via intermediate products to the oxides: Pr6O11, Ln2O3 (for Sm, Eu, Gd) and Tb4O7. TG-MS system was used to analyze principal volatile thermal decomposition and fragmentation products evolved during pyrolysis of Pr(III) and Sm(III) compounds in air.
New Y(III) and La(III) complexes with 4-bpy (4,4′-bipyridine) and trichloro- or dibromoacetates with the formulae: Y(4-bpy)2(CCl3COO)3·H2O I, La(4-bpy)1.5(CCl3COO)3·2H2O II, Y(4-bpy)1.5(CHBr2COO)3·3H2O III, and La(4-bpy)(CHBr2COO)3·H2O IV were prepared and characterized by chemical, elemental analysis, and IR spectroscopy. Conductivity studies (in methanol, dimethyloformamide, and dimethylsulfoxide) were also described. They are small, crystalline substances. The way of metal–ligand coordination was discussed. The thermal properties of complexes in the solid state were studied by TG-DTG techniques under dynamic flowing air atmosphere. TG-FTIR system was used to analyze principal volatile thermal decomposition and fragmentation products evolved during pyrolysis in dynamic flowing argon atmosphere for La(III) compounds.
Authors:R. Kusiorowski, T. Zaremba, J. Piotrowski, and J. Adamek
The thermalbehavior of the chrysotile asbestos samples is represented in Fig. 4 . In the temperature range 600–800 °C, chrysotile Mg 3 (OH) 4 Si 2 O 5 —regardless of origin and deposit—losses the chemical bonded water ( Fig. 4
formation of mesoporous materials and their quality.
As indicated by the conducted research [ 12 – 17 ], thermogravimetric analysis (TGA) provides a lot of valuable information both on the thermalbehaviour of samples of mesoporous materials and on
Authors:Barbara Barszcz, Joanna Masternak, Maciej Hodorowicz, and Agnieszka Jabłońska-Wawrzycka
this study, we report here the synthesis, spectroscopic analysis, X-ray crystallography and thermalbehavior of cadmium(II) complex with 3-hydroxy-2-quinoxalinecarboxylate (L 1 ). We have not found the crystal structure of [Cd(L 1 ) 2 (H 2 O) 2 ](H 2 O