Approach and setup to measure high thermal conductivity in multigraphene materials.

Area of Science:

• Materials Science
• Thermal Engineering
• Nanomaterials

Background:

• Accurate measurement of high thermal conductivity (λ > 300 W×m⁻¹×K⁻¹) is crucial for advanced materials.
• Existing methods like laser flash assay and HotDisc have limitations in certain applications.
• Developing novel measurement techniques is essential for characterizing novel materials like multigraphene.

Purpose of the Study:

• To develop and validate a novel setup for measuring high thermal conductivity materials.
• To assess the accuracy of the developed method by comparing it with established materials and techniques.
• To improve the reliability of thermal conductivity measurements, especially for materials like multigraphene.

Main Methods:

• Development of a measurement approach based on establishing temperature gradients and thermal flows.
• Integration of hardware and software for data acquisition and processing.
• Computer modeling of heat distribution and loss to enhance measurement accuracy.
• Experimental validation using materials such as copper, aluminum, isotropic graphite, and multigraphene.

Main Results:

• The developed setup successfully measured thermal conductivity for various materials, including multigraphene (λ ∼ 500 W×m⁻¹×K⁻¹).
• Computer modeling revealed a 2% overestimation in raw data for multigraphene due to heat losses, which was corrected.
• The device demonstrated reliable measurements, complementing existing instrumental capabilities.

Conclusions:

• The designed device provides accurate and reliable measurements for high thermal conductivity materials.
• The method effectively accounts for heat losses, improving measurement precision.
• This approach offers a valuable alternative or complement to laser flash assay and HotDisc for thermal conductivity characterization.