Differential scanning calorimetry is a thermal analysis technique that can be used to study the thermodynamic properties and chemical reaction processes of materials. In materials research, instruments can be used to study the thermal stability, glass transition temperature, crystallinity, intermolecular interactions, and other properties of materials.
Below we will take a closer look at how to use a differential scanning calorimeter for materials research.
1. Choosing the right experimental conditions is the key to conducting experiments. Experimental conditions include temperature range, scanning speed, atmosphere, etc. The temperature range needs to be selected based on the thermal stability of the sample, the scanning speed affects the reproducibility and accuracy of the experimental results, and the atmosphere controls the redox state of the sample.
2. The preparation of the sample is also a very important step. For samples such as polymers and composites, grinding and drying are required to eliminate the influence of moisture and impurities on experimental results. For samples such as metals and alloys, surface treatment is required to eliminate the effects of oxidation and corrosion on the experimental results.
3. When conducting the experiment, the sample needs to be placed in an aluminum crucible and placed between the heating furnace and the cooling furnace. The temperature of the furnace and cooling furnace is precisely controlled by a temperature controller, and the thermal process of the sample is controlled by the rate of heating and cooling. During the experiment, the sample is subjected to varying degrees of heat treatment, and its thermodynamic properties change, which are accurately measured and recorded by the instrument.
4. Analyzing and processing the experimental results is also a very important step. The data of the enthalpy and temperature-enthalpy curve of the sample can be obtained through the instrument. Through the analysis of these data, information about the thermodynamic properties of the sample and the chemical reaction process can be derived. For example, the glass transition interval of the sample can be obtained by analyzing the glass transition temperature, and the crystallization degree of the sample can be obtained by analyzing the crystallinity.
One person and one sentence to cheer for the graduate school entrance examination The use of differential scanning calorimetry for material research requires the selection of appropriate experimental conditions, the preparation of suitable samples, the accurate experimental operation, and the accurate analysis and processing of experimental results. These steps are very important, and only when each step is done well can we get reliable experimental results and accurate research conclusions.