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14 February 2017
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Teaching is concentrated in the faculties and schools, and the departments deal with research, which is also conducted by institutes and chairs, at the same time responsible for knowledge promotion.
L’thermogravimètrica analysis it is a technique that it measures the weighty change of a sample when this him heated, cooled or kept constant at a temperature. Its main use is to characterise the composition of materials. The areas of application include plastics, elastomers and thermostable, metals, mineral and ceramic compounds as well as an extensive rank of analysis in the chemical industries and chemists.
In order to request the analysis of samples for TGA, you have to get yourselves with the staff responsible for the team in touch.
It be necessary to inform of the toxicity and precautions of storage of the samples. If they do not come to search, the surpluses of sample will be destroyed in the deadline of a week from the delivery of results.
The sample to be analysed it stands about the dish of a microbalance and it works in in an oven with a very precise control of temperature.
A programme of temperatures is created depending on the process to monitor (loss of volatile, decomposition...). In the case of a dynamic programme, generally a warming, it be necessary to specify the initial temperature, the final temperature and the speed to the one who is wanted to be made the warming (ºC/ minute). In the case of an isothermal programme, it be necessary to specify the temperature of the isotherm and its duration.
By the inside of the oven a flow of gas that can be oxidising (air or pure oxygen) is made circulate itself or inert (nitrogen or argon) to study oxidatius processes depending on whether they are wanted or not.
During the application of the programme of temperatures, the microbalance registers the weight of the sample in continuum. This way a graph where the weight is represented is obtained from sample depending on the temperature or time.
Examples of thermal processes that can be moderate through the Thermogravimètrica Analysis:
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