What is differential thermal analysis?

Differential thermal analysis (DTA) occurs when two substances are exposed to the same temperature and thermal changes over time. The test usually includes a reference substance that its behavior is known under applied temperature conditions. Another substance is subjected to the same temperatures and the level of changes as a link. The sample can either absorb heat, in general it means that it is cooler than the link, or emit heat when it is warmer than the first material. With the data that are carried, scientists can determine how specific materials react at certain temperatures, as well as over time. They must remain in a steady state to work the experiment. The technique of differential thermal analysis is often performed by placing each material in a separate container. Each container is usually in a separate cavity in the same space. Tools called thermocoups are usually used to record the temperature of the difference between the two materials. Thermocoups can detect a change in phase such as melting or evaporation, as a signal.

Another method of differential thermal analysis may be the use of conductive pans, connecting the thermocoups inside the furnace. Both materials are more often heated evenly with the time when DTA is performed as follows. The test results are usually recorded using a DTA curve. Differences in temperature between materials or temperature change over time can be carried. The graph often visualizes the latent heat of the transition that occurs, while the fabric changes from one state to another; This usually causes the sample temperature to be temporarily less than the reference.

Differential thermal analysis often involves testing samples at higher temperatures than other forms of thermal analysis. It can be done with materials such as Jekov, Ceramics, Glass and Ceramics. Reference materials that are often used include silicon carbide and aluminum. Liquid reference standards sometimes include silicon oil.

Technology

In the 21st century, it combined differential thermal analysis with the ability to detect the weight loss and a temperature change. Software programs can automatically monitor the process and record measurements. Before the test, the tools for differential thermal analysis must be generally calibrated. A separate calibration procedure is operated by materials known to respond that they react a special way of the temperature ranges. Local and regional regulations can lead the calibration process for differential thermal analysis in pharmaceutical, food or environmental applications.