Modifying capillary pressure and boiling regime of micro-porous wicks textured with graphene oxide

Hong Seok Jo, Seongpil An, Xuan Hung Nguyen, Yong Il Kim, Boo Hyoung Bang, Scott C. James, Jeehoon Choi, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Liquid flow inside a heat pipe due to capillary forces can be used to cool electronic devices. To promote capillary-driven flow, a multilayer, porous wicking surface was designed for optimal liquid transport. The multilayer-porous structure consists of micro-porous structure decorated with nanomaterials. Herein, we demonstrate that micro-porous copper coated with graphene oxide (GO) has elevated capillary forces that can increase both the critical heat flux and the convective heat transfer coefficient. The thin GO layer promotes hydrophilicity that enhances the wettability of the wicking surface. However, an excessively thick GO coating can decrease permeability even in the presence of increased capillary pressures such that overall flow is hindered. In this work an optimal coating thickness is identified and characterized by heat-transfer experiments and scanning electron microscopy.

Original languageEnglish
Pages (from-to)1605-1610
Number of pages6
JournalApplied Thermal Engineering
Publication statusPublished - 2018


  • Boiling limitation
  • Capillary pressure
  • Graphene oxide
  • Heat pipe
  • Permeability
  • Wicking

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering


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