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Journal of Nanomaterials
Volume 2014, Article ID 347909, 6 pages
http://dx.doi.org/10.1155/2014/347909
Research Article

Application of Multiwalled Carbon Nanotube Nanofluid for 450 W LED Floodlight

1Institute of Materials Science (IMS), Vietnam Academy of Science and Technology, A2 Building, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 122102, Vietnam
2Center for High Technology Development (HTD), Vietnam Academy of Science and Technology, 2B Building, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 122102, Vietnam

Received 28 February 2014; Revised 17 June 2014; Accepted 17 June 2014; Published 1 July 2014

Academic Editor: Jinlong Jiang

Copyright © 2014 Bui Hung Thang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Overheating of the high-power light emitting diode (LED) has a dramatic effect on the chip’s lifetime. Heat dissipation for high-power LED is becoming a major challenge for researchers and technicians. Compared with the air cooling method, the liquid cooling method has many advantages and high efficiency because of higher specific heat capacity, density, and thermal conductivity. Carbon nanotubes with remarkable thermal properties have been used as additives in liquids to increase the thermal conductivity. In this work, multiwalled carbon nanotubes nanofluid (MWCNTs nanofluid) was used to enhance heat dissipation for 450 W LED floodlight. MWCNTs nanofluid was made by dispersing the OH functionalized MWCNTs in ethylene glycol/water solution. The concentration of MWCNTs in fluid was in the range between 0.1 and 1.3 gram/liter. The experimental results showed that the saturated temperature of 450 W LED chip was 55°C when using water/ethylene glycol solution in liquid cooling system. In the case of using MWCNTs nanofluid with 1.2 gram/liter of MWCNTs’ concentration, the saturated temperature of LED chip was 50.6°C. The results have confirmed the advantages of the MWCNTs for heat dissipation systems for high-power LED floodlight and other high power electronic devices.