Anisotropy

Modern batteries (Li-ion) have drastically different thermal ­conductivity in different directions. Using a Hot Disk instrument makes it easy and accurate to ­measure these properties, in one single transient.

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Graphite Structures

Testing high-conducting graphite with the Hot Disk method is gives fast and accurate results.

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Liquids

For testing low-viscosity liquids (eg. Toluene and H2O), short measurement times are required to avoid convective heat transfer.

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Powders

Thermal Conductivity Measurements on powders depend on applied particle-particle pressure as well as interstitial gas pressure. Here we show how these factors affect the measurement results.

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Thermal Conductivity of Silicone Oil – Polydimethylsiloxane

Testing the intrinsic thermal conductivity of liquids can be a challenge compared to testing solids. The reason for this is that convective heat transfer in the fluid during the measurement. However, the Hot Disk method can be utilized to test liquid samples with relative ease. The keys to success are small volumes, closed sample cells and short measurement times.

In this example, a commercial silicone oil has been tested to demonstrate the robustness of Hot Disk results when measuring on liquids.

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Thermal Contact Resistance

Thermal contact resistance is always present in the interface between two solid surfaces. In this example, we look at contact resistance between layers in a stack of copper sheets and its impact on the apparent thermal conductivity across the layers.

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Thermoelectric

Testing small thermoelectric samples is easy with the Hot Disk technique. In this example two sets of hot-pressed Bi₂Te₃, p- and n-type, with diameter 12 mm and thickness 3.5 mm where analysed.

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