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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 8, 2004
Accepted August 10, 2004

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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탄소 나노튜브를 함유한 나노유체의 열전도도 증가

Enhancing Thermal Conductivity of Nanofluids Containing Carbon Nanotubes

조태현 박상도¹ 이영석² 백일현^†

Tae-Hyun Cho Sang-Do Park¹ Young-Seak Lee² Il-Hyun Baek^†

한국에너지기술연구원 청정에너지연구부, 305-343 대전시 유성구 장동 71-2 ¹한국에너지기술연구원 이산화탄소저감및처리기술개발사업단, 305-343 대전시 유성구 장동 71-2 ²순천대학교 화학공학과, 540-742 전남 순천시 매곡동 315

Clean Energy Research Department, Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea ¹Carbon Dioxide Reduction & Sequestration R&D Center, Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea ²Department of Chemical Engineering & Nanotechnology Center, Sunchon National University, 315, Maegok-dong, Sunchon, Chonnam 540-742, Korea

ihbaek@kier.re.kr

Korean Chemical Engineering Research, October 2004, 42(5), 624-629(6), NONE Epub 18 November 2004

Abstract

에틸렌글리콜에 탄소 나노튜브를 부유시켜 높은 열전도도를 가진 열전달유체로 사용할 수 있는 나노유체를 직접 및 산처리 분산방법을 이용하여 제조하였다. 직접 분산방법은 에틸렌글리콜에 탄소 나노튜브를 넣은 후 초음파로 처리하여 탄소나노튜브를 분산시키는 방법(S-CNT), 또는 에틸렌글리콜에 분산 안정제인 PAA-co-AA(polyacrylamide-co-acrylicacid)를 용해시킨 후 탄소 나노튜브를 넣고 초음파로 처리하여 탄소 나노튜브를 분산시키는 방법(D-CNT)으로 하였다. 산처리 분산방법은 에틸렌글리콜에 산을 이용하여 표면 처리한 탄소 나노튜브를 넣은 후 초음파로 처리하여 탄소 나노튜브를 분산하였다(A-CNT). 나노유체의 열전도도는 hot wire method에 의해 측정하였다. 1 vol% S-CNT, D-CNT 및 A-CNT의 열전도도는 순수 에틸렌글리콜의 열전도도와 비교할 때 16, 14, 15% 향상하였다. S-CNT을 이용하여 만든 나노유체에 나노튜브 농도가 1, 2, 3 vol%증가함에 따라 순수한 에틸렌글리콜에 비해 열전도도는 16, 19, 23% 증가하였다.

Nanofluids, the suspension of carbon nanotubes (CNTs) in ethylene glycol which can be used as heat transfer fluid having high thermal conductivity, were prepared by dispersion of CNTs in ethylene glycol using direct and acid treatment dispersion methods. Direct dispersion method was achieved by sonication of ethylene glycol having CNTs (SCNT) or by sonication after dissolution of PAA-co-AA (polyacrylamide-co-acrylicacid) stabilizer into above ethylene glycol (D-CNT). Acid treatment dispersion method was done by sonication of ethylene glycol involving CNTs treated the surface with acids (A-CNT). The thermal conductivities of nanofluids were measured by hot wire method. The thermal conductivities of S-CNT, D-CNT, and A-CNT containing 1 vol% of CNTs increased up to 16, 14, and 15%, compared to that of pure ethylene glycol. The thermal conductivities of nanofluids prepared by S-CNT increased up to 16, 19, and 23% with increasing CNTs concentrations of 1, 2, and 3 vol%, respectively.

Keywords

Nanofluids Carbon Nanotube Thermal Conductivity Heat Transfer Fluids

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