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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.
Thermogravimetric analysis is a technique that measures the change in weight of a sample when it is heated, cooled or kept at a constant temperature. Its main use is to characterise the composition of materials. Areas of application include plastics, elastomers and thermostables, metals, mineral compounds and ceramics as well as a wide range of analysis in the chemical and pharmaceutical industries.
In order to request the analysis of samples by TGA, you must contact the staff responsible for the equipment.
The toxicity and storage precautions of the samples must be reported. If unclaimed, surplus samples will be destroyed within one week of delivery of results.
The sample to be analysed is placed on the plate of a microbalance and introduced into an oven with a very precise temperature control.
A temperature program is created depending on the process to be monitored (loss of volatiles, decomposition,...). In the case of a dynamic program, usually a warm-up, it is necessary to specify the initial temperature, the final temperature and the speed at which you want to do the warm-up (ºC/minute). In the case of an isotherm program, it is necessary to specify the temperature of the isotherm and its duration.
A flow of gas circulates inside the oven, which can be oxidising (air or pure oxygen) or inert (nitrogen or argon) depending on whether you want to study oxidative processes or not.
During the application of the temperature program, the microbalance continuously records the weight of the sample. In this way, a graph is obtained where the sample weight is represented as a function of temperature or time.
Examples of thermal processes that can be measured using Thermogravimetric Analysis:
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