The first European Symposium on Thermal Analysis and Calorimetry (ESTAC) was held in Salford, UK in 1976. On the occasion of the tenth ESTAC in Rotterdam, this is article provides an overview of the history, aims and philosophy of ESTAC.
A new thermobalance is described which gives a direct plot of percentage weight loss versus sample temperature, without the need for replotting the results. The unit operates over the range ambient to 1000°C and features a miniature water-cooled furnace in conjunction with an electronic microbalance, giving sensitivities of 1–250 mg for full scale deflection on a potentiometric recorder. Heating rates of 1–100°C/minute are available and the furnace will cool from 1000°C to 50°C in less than four minutes. Typical applications of the unit are illustrated by reference to a number of inorganic and polymer systems.
A recently-developed quadrupole mass spectrometer system specifically designed for thermal analysis studies, has been linked
to a thermobalance and a simultaneous TG-DTA unit, for evolved gas analysis. The performance and applicability of the system
is illustrated by examples from four fields of study
Authors:E. Charsley, C. Stewart, P. Barnes, and G. Parkes
Sample controlled thermal analysis techniques such as constant rate transformation analysis or stepwise isothermal analysis,
where the transformation rate of the sample itself is used to control the experiment, are becoming increasingly important
. The measurements are normally carried out using changes in the sample mass, sample dimensions or in the evolved gas,
as the property used to control the experiment, and enable reactions to be studied in greater detail than is possible using
linear heating techniques. A new approach is described here where a thermomicroscopy system has been developed to enable the
intensity of the light reflected or transmitted by the sample to be used as the controlling signal .
Authors:G. Parkes, P. Barnes, E. Charsley, and G. Bond
This paper describes a new instrument for performing thermal analysis using microwaves both as a form of heating and as a
novel means of detecting thermally induced transformations in materials. Results are presented for a selection of processes
including decompositions, dehydrations and phase changes. The capability of the instrument to be coupled with ancillary techniques
such as EGA is also demonstrated.
Authors:E. Charsley, C. Earnest, P. Gallagher, and M. Richardson
The ICTAC Committee on Standardisation has formed a Task Group to investigate the suitability of the ICTAC Certified Reference
Materials for DTA, covering the temperature range 450°–1100°C, for accurate temperature calibration purposes and to evaluate
their potential as enthalpy calibrants for DTA and DSC equipment. This paper reports the results of preliminary round-robin
studies on barium carbonate and strontium carbonate, using a dual-point calibration method based on the melting points of
aluminium and gold. In addition the fusion of ICTAC potassium sulphate has been investigated as a possible calibration transition.