Dear Researchers
I am looking for a answer to a question regarding Thermal gravimetric analysis (TGA). How to read and explain TGA curves? what necessary information should be included while explaining it on research paper?
TGA analysis measures the amount of weight change of a material, either as a function of increasing temperature or could also isothermally as a function of time, in different atmosphere( different gas used or vacuum). Analysis often allows understand quantitative composition, when reading the graph with temperature and weight change of decomposition. Depending on material this analysis,among others, can determine water content, evaporation rates, determine the purity of materials etc.
TGA is a simple tool used to study the thermal degradation of samples. The experiment may be pyrolysis or combustion. Models can be used to predict the kinetic parameters of a particular reaction. And also we can study the thermal behaviour of sample for a particular temperature or heating rate...
TGA is a technical tools for researcher where thermal influence on gravimetric parameter i.e. mass of the sample is recorded in presence of some gas, vacuum. Some physical phenomena, such as thermal stability, phase transformation, absorption (i.e. bounding of gas molecule by MOF), desorption (i.e. removal of solvent) , redox reaction (i.e. oxidation in presence of oxygen/ reduction in presence of hydrogen) of the sample are revealed by TGA technique. Generally, the TGA curve is portrayed by taking mass percentage of the sample on Y-axis and temperature or time on the X-axis.
Just to add to the above comments, it is often useful to analyse not only the weight curve but also the derivative, the maximums of the derivative signal will more clearly show you any changes that your material is going through.
(Example, Fig 5 here: Data Carbon Nanotubes Synthesis by Catalytic Decomposition of Eth...
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i) For RG discussion on the TGA traces for either a generic thermal decomposition or sublimation: https://www.researchgate.net/post/Is_it_possible_to_differentiate_between_sublimation_and_decomposition_in_simple_TG_measurement
ii) For RG discussion on the thermal decomposition of sodium carbonate: https://www.researchgate.net/post/Thermal_decomposition_of_Sodium_Carbonate
iii) On TGA analysis of calcium carbonate minerals (e.g. calcite) containing iron: https://www.researchgate.net/post/How_would_the_addition_of_metallic_iron_to_a_sample_of_CaCO3_effect_the_TGA_and_DSC_curves_of_CaCO3
iv) On TGA analysis of a (possibly impure) sodium chloride sample: https://www.researchgate.net/post/Thermal_behavior_of_NaCl
v) On TGA analysis of erythritol: https://www.researchgate.net/post/How_to_interpret_a_second_small_step_in_TGA_curve
vi) Possible generic reasons for weight gain detection in TGA were discussed elsewere at this forum:
https://www.researchgate.net/post/Why_my_TGA_graph_shows_a_weight_gain https://www.researchgate.net/post/What_is_the_process_to_get_a_weight_Gain_in_TGA https://www.researchgate.net/post/What_are_the_reasons_for_weight_gain_in_TG_curve_My_sample_is_Cement_and_the_weight_gain_is_in_the_temp_range_of_400_to_650_degree
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