Interfacial thermal resistance between the graphene-coated copper and liquid water

Abstract

a b s t r a c tThe thermal coupling at water-solid interfaces is a key factor in controlling thermal resistance and the performance of nanoscale devices. This is especially important across the recently engineered nano-composite structures composed of a graphene-coated-metal surface. In this paper, a series of molecular dynamics simulations were conducted to investigate Kapitza length at the interface of liquid water and nano-composite surfaces of graphene-coated-Cu(1 1 1). We found that Kapitza length gradually increased and converged to the value measured on pure graphite surface with the increase of the number of graphene layers inserted on the Cu surface. Different than the earlier hypothesis on the ''transparency of graphene," the Kapitza length at the interface of mono-layer graphene coated Cu and water was found to be 2.5 times larger than the value of bare Cu surface. This drastic change of thermal resistance with the additional of a single graphene is validated by the surface energy calculations indicating that the mono-layer graphene allows only $18% van der Waals energy of underneath Cu to transmit. We introduced an ''overall interaction strength" value for the nano-composites based the quantitative contribution of pair interaction potentials of each material with water into the total surface energy in each case. Similar to earlier studies, results revealed that Kapitza length shows exponentially variation as a function of the estimated interaction strength of the nano-composite surfaces. The effect of Cu/graphene coupling on thermal behavior between the nano-composite with water was characterized. The Kapitza length was found to decrease significantly with increased Cu/graphene strength in the case of weak coupling, while this behavior becomes negligible with strong coupling of Cu and graphene.

Transport Phenomena of Water in Molecular Fluidic Channels

“…where η bulk is the bulk viscosity of liquid water ( η bulk = 0.71 Pa.s × 10 −3 ), and L i is the solid-liquid interface thickness corresponding to 0.8 nm for this work. Similar thicknesses for water-graphene and water-copper interfaces have been found recently 23 35 36 41 . We calculated the apparent viscosity, μ app , as the average of local viscosity within the interface region.…”

“…Recent developments in nanoscience and nanotechnology have made it possible to deposit mono-/few-layer graphene on bare substrates 37 38 39 . Although graphene is one atom thick, it can have the energy transmission from the underlying solid substrate to the thin film liquid changed 40 41 42 . Therefore, the introduction of graphene leads to a new class of surfaces, the so-called nanocomposite walls, at which the wall-fluid interaction strength is tuned.…”

Enhanced mechanical and thermal properties of electrically conductive TPNR/GNP nanocomposites assisted with ultrasonication

“…The calculated ITR of this nanocomposite system from the Nans model was ~ 10 -7 m 2 K/W. This ITR value is consistent with the recently published values in GNP/boron-nitride/epoxy [33] system (~ 10 -7 m 2 K/W), graphene-coated copper/water [35] system (0.8 x 10 -7 m 2 K/W) and GNP/epoxy [36] system (0.1 x 10 -7 m 2 K/W).…”

Manipulating thermal resistance at the solid–fluid interface through monolayer deposition

“…33 The enhancement of condensation heat transfer performance with graphene coatings was also conrmed in the report of Preston et al 34 More recently, the results on Kapitza resistance revealed that the interfacial temperature jump increases with the introduction of graphene at the interface between solid and uid water. [35][36][37] Meanwhile, the dominant inuence of monolayers WS 2 and MoS 2 on the wettability of the underlying substrates has also been investigated. 38 It was shown that even when a monolayer WS 2 (or MoS 2 ) is coated, the measured contact angle highly increases compared to the substrate without coatings.…”