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John O | October 2016

Researchers see thermal benefit from carbon nanotubes

researchers at the vietnam academy of science and technology released a report in june entitled, “thermo-mechanical properties of carbon nanotubes and applications in thermal management.” the paper studied the synthesis of “heat conductive materials” composed of carbon nanotubes-based greases, oils, and nanoliquids and their impact on high-powered electronics and internal combustion devices.



carbon nanotube. (wikimedia commons)


the study concluded that adding carbon nanotubes to conductive materials produced significant, tangible results on the thermal management of high-powered devices. this included led applications and for heat dissipation of intel processors.


the abstract for the report, which was authored by manh hong nguyen and eight other engineers, read:


“thanks to their very high thermal conductivity, high young's modulus and unique tensile strength, carbon nanotubes (cnts) have become one of the most suitable nano additives for heat conductive materials. in this work, we present results obtained for the synthesis of heat conductive materials containing cnt based thermal greases, nanoliquids and lubricating oils. these synthesized heat conductive materials were applied to thermal management for high power electronic devices (cpus, leds) and internal combustion engines.


“the simulation and experimental results on thermal greases for an intel pentium iv processor showed that the thermal conductivity of greases increases 1.4 times and the saturation temperature of the cpu decreased by 5 °c by using thermal grease containing 2 wt% cnts. nanoliquids containing cnt based distilled water/ethylene glycol were successfully applied in heat dissipation for an intel core i5 processor and a 450 w floodlight led.


“the experimental results showed that the saturation temperature of the intel core i5 processor and the 450 w floodlight led decreased by about 6 °c and 3.5 °c, respectively, when using nanoliquids containing 1 g l−1 of cnts.


“the cnts were also effectively utilized additive materials for the synthesis of lubricating oils to improve the thermal conductivity, heat dissipation efficiency and performance efficiency of engines. the experimental results show that the thermal conductivity of lubricating oils increased by 12.5%, the engine saved 15% fuel consumption, and the longevity of the lubricating oil increased up to 20 000 km by using 0.1% vol. cnts in the lubricating oils.


“all above results have confirmed the tremendous application potential of heat conductive materials containing cnts in thermal management for high power electronic devices, internal combustion engines and other high power apparatus.”


read the full report at http://iopscience.iop.org/article/10.1088/2043-6262/7/2/025017/meta

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