Layer-by-layer carbon nanotube coatings for enhanced pool boiling heat transfer on metal surfaces

Seunghyeon Lee, Gwang Hyeok Seo, Sanghyeok Lee, Uiju Jeong, Sang Jun Lee, Sung Joong Kim, Wonjoon Choi

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


Micro/nanotextured coatings have enabled the manipulation of thermal characteristics in pool boiling heat transfer such as the heat transfer coefficient (HTC) and critical heat flux (CHF) because of the ability to optimize bubble formations and departures. However, fabricating such coatings on substrates involves high cost-bulky setup, and is limited by the materials and adhesion properties. Herein, we report layer-by-layer (LbL)-assembled polyethylenimine (PEI)-multi-walled carbon nanotube (MWCNTs) coatings on stainless steel (SS316) to enhance HTC and CHF in pool boiling heat transfer. LbL-assembled PEI-MWCNTs coatings (10, 20, 40 bi-layers) on SS316 were fabricated, whereas bare SS316 substrate and vacuum-filtered MWCNTs coating were prepared as controls. Because of the nano-cavities and the inner-nanoporous structures, LbL coatings showed significant enhancement of HTCs and CHFs compared to bare SS316. Furthermore, denser networks of MWCNTs due to electrostatic bonding and hydrophilic nature of PEI in the LbL coatings could enhance the HTCs and CHFs compared to vacuum-filtered MWCNTs coating. LbL-assembled PEI-MWCNTs of 20 bi-layers showed the highest improvement in HTC, whereas the 40 bi-layers coatings achieved the best enhancement ratio of CHF, (∼147%). Further development of the LbL-assembled coatings on metal surfaces would enable potential applications for thermal management, from micro/nanoscale platforms to macroscale systems.

Original languageEnglish
Pages (from-to)607-618
Number of pages12
Publication statusPublished - 2016 Oct 1

Bibliographical note

Funding Information:
The authors gratefully acknowledge the financial support provided by Defense Acquisition Program Administration and Agency for Defense Development under the contract UD150032GD. This work was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education ( NRF-2015R1D1A1A01059274 ), and by the Korean government (MSIP: Ministry of Science, ICT and Future Planning ) (No. NRF-2016R1A5A1013919 ).

Publisher Copyright:
© 2016 Elsevier Ltd

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science


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