Multi-User Equipment aproved in the grant 2013/16930-7: thermogravimetric analyzer TGA/DSC

• Grant number: 14/23216-1
• Support Opportunities: Multi-user Equipment Program
• Start date: June 01, 2015
• End date: May 31, 2017
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Edson Antonio Ticianelli
• Grantee: Edson Antonio Ticianelli
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion, AP.TEM
• EMU web page: Página do Equipamento Multiusuário não informada
• Type of equipment: Caracterização de Materiais - Propriedades Físicas - Térmicas (calorimetria)
• Manufacturer: Fabricante não informado
• Model: Modelo não informado

Abstract

By using differential thermal analysis (DTA) and differential scanning calorimetry (DSC), it is possible to monitor liberation/absorption of heat associated to physical or chemical changes in a sample, such as phase transitions (melting, boiling, sublimation, freezing, crystal structure inversions) or dehydration, dissociation, decomposition, oxi-reduction, reactions, etc. In general, phase transitions, melting, desorption, dehydration, reduction and decomposition reactions produce endothermic effects (DH>0), whereas crystallization, adsorption, oxidation, some decomposition reactions (oxidative degradation, oxidation-reduction state solid) produce exothermic effects (DH<0). DSC is preferred for measuring heat flow rates and enthalpy values. DTA can be used to estimate values of DH, when necessary, but requiring specific calibration for the correct conversion of the peak area into enthalpy. This technique is more suitable for analysis at higher temperatures and more aggressive environments, where DSC cannot be used. DSC is ideal to obtain quantitative information about changes arising from thermal procedures, while DTA is more suitable to obtain qualitative information. The use in the thematic project and more generally may involve all areas related to catalyst/material preparations, particularly when involving thermal treatments. This is the case of the new research line associated to the development of materials to be used in solid oxide fuel cells (SOFC). The appropriate thermal treatment condition involving calcination, sintering and densification, will be determined by thermogravimetry analysis, differential thermal analysis and differential scanning calorimetry. (AU)