Kapitza Resistance between Few-Layer Graphene and Water: Liquid Layering Effects
The Kapitza resistance (RK) between few-layer graphene (FLG) and water was studied using molecular dynamics simulations. The R_K was found to depend on the number of the layers in the FLG though, surprisingly, not on the water block thickness. This distinct size dependence is attributed to the large difference in the phonon mean free path between the FLG and water. Remarkably, R_K is strongly dependent on the layering of water adjacent to the FLG, exhibiting an inverse proportionality relationship to the peak density of the first water layer, which is consistent with better acoustic phonon matching between FLG and water. These findings suggest novel ways to engineer the thermal transport properties of solid–liquid interfaces by controlling and regulating the liquid layering at the interface.
Additional Information© 2015 American Chemical Society. Received: April 28, 2015; Published: August 14, 2015. J.C. acknowledges support as an ETH Zurich Fellow and the EU Marie Curie Actions for People COFUND Program, the startup grant (No. 152225) at Tongji University, and the National Youth 1000 Talents Program in China. P.A. and P.K. acknowledge support by the European Research Council (Advanced Investigator Award No. 2-73985-14). The authors declare no competing financial interest.
Supplemental Material - nl5b03024_si_001.pdf