Enhanced thermal conductance at the graphene–water interface based on functionalized alkane chains

Chen, Shuyu; Yang, Ming; Liu, Bin; Xu, Min; Zhang, Teng; Zhuang, Bilin; Ding, Ding; Huai, Xiulan; Zhang, Hang

doi:10.1039/c8ra09879d

Cited by 23 publications

(11 citation statements)

References 46 publications

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“…Heat carriers of high frequency are important to thermal transport across interfaces [ 28 , 30 , 31 ]. As previously described, the oxidation of graphene (GO and rGO) provided phonon vibrations at high frequencies that are not present in the pristine graphene (G).…”

Section: Resultsmentioning

confidence: 99%

“…The phonons play an important role in the thermal conductivity across the interface between two phases or materials, so the study of this type of vibration mode gives a deep understanding of the influence of atomistic properties on a property such as this [ 26 , 27 ]. The DOS was computed by calculating the Fourier transformation of the atomic velocity autocorrelation functions [ 28 ]:

where v (0) and v ( t ) are the velocities of each atom at initial time and time t , respectively, and ω is the frequency. The DOS spectra of graphene fillers and polymers were obtained by monitoring the velocity autocorrelation function of the corresponding atoms.…”

Section: Methodsmentioning

confidence: 99%

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Effects of Graphene Oxidation on Interaction Energy and Interfacial Thermal Conductivity of Polymer Nanocomposite: A Molecular Dynamics Approach

et al. 2021

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Interfacial characteristics of polymer nanocomposites represent a crucial aspect to understand their global properties and to evaluate the interaction between nanofillers and matrix. In this work we used a molecular dynamics (MD) approach to characterize the interfacial region at the atomistic scale of graphene-based polymer nanocomposites. Three different polymer matrixes were considered, polylactic acid (PLA), polypropylene (PP) and epoxy resin (EPO), which were reinforced with three types of graphene fillers: pristine graphene (G), graphene oxide (GO) and reduced graphene oxide (rGO). In particular, the compatibility of the nanofillers in polymer matrixes were evaluated in terms of the interaction energy, while the interfacial thermal resistance (Kapitza resistance) between matrices and fillers was calculated with a nonequilibrium molecular dynamics (NEMD) method. Results showed that the oxidation degree plays an important role on the studied properties of the interfacial region. In particular, it was observed that the Kapitza resistance is decreased in the oxidized graphene (GO and rGO), while interaction energy depended on the polarity of the polymer matrix molecules and the contribution of the Coulombic component.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effects of Graphene Oxidation on Interaction Energy and Interfacial Thermal Conductivity of Polymer Nanocomposite: A Molecular Dynamics Approach

et al. 2021

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“…Therefore, when there is both a substrate and a medium on top, the propagation of heat in graphene is distinguished from the suspension graphene. [29][30][31][32] Contact with a substrate and a medium on top could results in a decrease in the thermal conductivity of graphene.…”

Section: Resultsmentioning

confidence: 99%

Photothermal‐Transport Imaging and Thermal Management of 2D Materials

et al. 2021

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Thermal management plays an important role in miniaturized and integrated nanoelectronic devices, where finding ways to enable efficient heat‐dissipation can be critical. 2D materials, especially graphene and hexagonal boron nitride (h‐BN), are generally regarded as ideal materials for thermal management due to their high inherent thermal conductivity. In this paper, a new method is reported, which can be used to characterize thermal transport in 2D materials. The separation of pumping from detection can obtain the temperature at different distances from the heat source, which makes it possible to study the heat distribution of 2D materials. Using this method, the thermal conductivity of graphene and molybdenum disulfide is measured, and the thermal diffusion for different shapes of graphene is explored. It is found that thermal transport in graphene changes when the surrounding environment changes. In addition, thermal transport is restricted at the boundary. These processes are accurately simulated using the finite element method, and the simulated results agree well with the experiment. Furthermore, by depositing a layer of h‐BN on graphene, the heat‐dissipation characteristics of graphene become tunable. This study introduces and describes a new method to investigate and optimize thermal management in 2D materials.

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“…In addition, it was shown that the local thermal conductivity of the aqueous shell adjacent to the nanoparticle is approximately 50% higher than in volumetric water [ 57 ]. The calculations were made for metal particles [ 56 , 57 ] and systems containing graphene (4∙10 −8 m 2 K W −1 ) [ 55 , 58 ] and carbon nanotubes [ 59 ].…”

Section: Discussionmentioning

confidence: 99%

Thermal Conductivity of Detonation Nanodiamond Hydrogels and Hydrosols by Direct Heat Flux Measurements

Usoltseva

Volkov

Karpushkin

et al. 2021

Gels

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The methodology and results of thermal conductivity measurements by the heat-flow technique for the detonation nanodiamond suspension gels, sols, and powders of several brands in the range of nanoparticle concentrations of 2–100% w/w are discussed. The conditions of assessing the thermal conductivity of the fluids and gels (a FOX 50 heat-flow meter) with the reproducibility (relative standard deviation) of 1% are proposed. The maximum increase of 13% was recorded for the nanodiamond gels (140 mg mL−1 or 4% v/v) of the RDDM brand, at 0.687 ± 0.005 W m−1 K−1. The thermal conductivity of the nanodiamond powders is estimated as 0.26 ± 0.03 and 0.35 ± 0.04 W m−1 K−1 for the RUDDM and RDDM brands, respectively. The thermal conductivity for the aqueous pastes containing 26% v/v RUDDM is 0.85 ± 0.04 W m−1 K−1. The dignities, shortcomings, and limitations of this approach are discussed and compared with the determining of the thermal conductivity with photothermal-lens spectrometry.

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Enhanced thermal conductance at the graphene–water interface based on functionalized alkane chains

Abstract: This work demonstrates an effective and universal method to improve thermal transport properties on the interface between multilayer graphene and water by a factor of ~4 via grafting functionalized groups on graphene.

Cited by 23 publications

References 46 publications

Effects of Graphene Oxidation on Interaction Energy and Interfacial Thermal Conductivity of Polymer Nanocomposite: A Molecular Dynamics Approach

Effects of Graphene Oxidation on Interaction Energy and Interfacial Thermal Conductivity of Polymer Nanocomposite: A Molecular Dynamics Approach

Photothermal‐Transport Imaging and Thermal Management of 2D Materials

Thermal Conductivity of Detonation Nanodiamond Hydrogels and Hydrosols by Direct Heat Flux Measurements

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