Our group developes composite materials based on carbon nanotubes. These new materials are to be used in thermal management (e.g. cooling of machines). To determine the thermophysical properties of various composite materials we have several different experimental methods available.
The Linseis Dilatometer L75 Pt1000
measures the change of length of a solid sample as a function of the change in temperature. This dilatometer can be used to investigate samples in a temperature range from room temperature to 1000 ° C. The dilatometer measures, the technical expansion coefficient, the linear thermal expansion coefficient and the physical expansion coefficient of the sample.
DSC - Differential Scanning Calorimetry
To determine the reaction enthalpy, the melting heat and the specific heat capacity, our work group has a Linseis differential scanning calorimeter. It measures the heat flux between the sample and a reference over a well defined distance. The heat flux is measured while the temperature is changing.
XFA 500 Xenon Flash Thermal Constant Analyzer
With the Linseis XFA 500 Xenon Flash Thermal Constant Analyzer the thermal diffusivity of solid samples can be determined in a range between RT and 500° C. A short xenon flash lamp heats a flat, thermally insulated sample on the front. The device measures the temperature at the back of the sample and from its course over time, the temperature conductivity is determined.
Hot Disk TPS 2500
To determine the thermal conductivity of a sample we use the Hot Disk TPS 2500. The area sensor acts as the heat source and as the temperature sensor. In a standard measurement the sensor is put into a sample. Thus, the sensor is surrounded by two identical materials. The sensor records the characteristics of the temperature change over time. This is readily translated into the samples temperature conductivity.