TGA/DTA Thermogravimetric analysis

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Presentation transcript:

TGA/DTA Thermogravimetric analysis The technique in which the mass change in a sample is measured as a function of temperature, while subjected to a controlled temperature program. Sigmoidal curves Temperature range DTA http://butterflyandbiotech.blogspot.com/2012/05/know-basics-about-dta-and-tga.html http://www.scielo.cl/scielo.php?pid=S0717-97072003000300010&script=sci_arttext

Thermal Methods Controlled temperature programs dT/dt  constant Isothermal Modulated Complex step Self regulating T t T t

TGA TGA instrumentation Photodiodes Infrared LED Meter movement Balance arm Sample platform Thermocouple Sample pan Furnace assembly Purge gas outlet Heater Elevator base Purge gas inlet Sample pan holder Tare pan http://www.tainstruments.com/product.aspx?id=21&n=1&siteid=11

Crucible & Thermobalance Pt sample pans Ni, Al, Al2O3, SiO2, ceramic Thermobalance Vertical rotating pivot Null deflection system http://www.tainstruments.com/pdf/brochure/2011%20TGA%20Brochure.pdf

Furnace, Thermocouples & Atmosphere Resistive alloy windings Thermocouples (B,R,S) Pt-Pt/Rh Atmosphere Inert Removal of evolved gases Vacuum http://www.tainstruments.com/pdf/brochure/2011%20TGA%20Brochure.pdf

Compositional Analysis Degradation Curves a b c Compositional Analysis Wt.% loss Plateaus vs. shoulders Wt.% gain Principles of Thermal Analysis and Calorimetry, P.J. Haines et al., Royal Society of Chemistry, 2002

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