Salt templated and graphene nanoplatelets draped copper (GNP-draped-Cu) composites for dramatic improvements in pool boiling heat transfer.

Scientific Reports
Aniket M RishiAnju Gupta

Abstract

We demonstrate a novel technique to achieve highly surface active, functional, and tunable hierarchical porous coated surfaces with high wickability using a combination of ball milling, salt-templating, and sintering techniques. Specifically, using ball-milling to obtain graphene nanoplatelets (GNP) draped copper particles followed by salt templated sintering to induce the strength and cohesiveness to the particles. The salt-templating method was specifically used to promote porosity on the coatings. A systematic study was conducted by varying size of the copper particles, ratio of GNP to copper particles, and process parameters to generate a variety of microporous coatings possessing interconnected pores and tunnels that were observed using electron microscopy. Pool boiling tests exhibited a very high critical heat flux of 289 W/cm2 at a wall superheat of just 2.2 °C for the salt templated 3 wt% GNP draped 20 µm diameter copper particles with exceedingly high wicking rates compared to non-salt-templated sintered coatings. The dramatic improvement in the pool boiling performance occurring at a very low surface temperature due to tunable surface properties is highly desirable in heat transfer and many other engineering applicati...Continue Reading

References

Jul 30, 2008·Journal of the American Chemical Society·Zhuang LiuHongjie Dai
Jan 29, 2009·Nano Letters·Goki Eda, Manish Chhowalla
May 11, 2010·Nature Materials·Suchismita GhoshAlexander A Balandin
Jul 7, 2012·Nano Letters·Axel EckmannCinzia Casiraghi
Apr 1, 2015·Nano Letters·Daniel J PrestonEvelyn N Wang
Sep 10, 2015·Scientific Reports·Ajay KrishnamurthyNikhil Koratkar
Oct 8, 2015·ACS Applied Materials & Interfaces·Michael ShteinOren Regev
Dec 4, 2015·ACS Applied Materials & Interfaces·Md Julker NineDusan Losic

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Methods Mentioned

BETA
electron microscopy
transmission electron microscopy
x-ray spectroscopy
chip

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