Why Carbon Nanotubes rule!
As fillers go, it is with good reason why carbon nanotubes have become so popular as a means of improving the thermal conductivity polymer composites. Steel is cheap but has a relatively low thermal conductivity between 14 and 16 W/mK. Aluminum is much higher around 220 W/mK. Copper is even better around 400 W/mK. Diamond has an impressive thermal conductivity of approximately 2000 W/mK. But none are close to the thermal conductivity of carbon nanotubes (CNTs) with a thermal conductivity of over 3,000 W/mK!
To learn more about how to measure thermal conductivity - click here.