Thermal transmittance of carbon nanotube networks: Guidelines for novel thermal storage systems and polymeric material of thermal interest

Fasano, Matteo; Bigdeli, Masoud Bozorg; Sereshk, Mohammad Rasool Vaziri; Chiavazzo, Eliodoro; Asinari, Pietro

doi:10.1016/j.rser.2014.08.087

Cited by 36 publications

(26 citation statements)

References 86 publications

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“…The impact of horizontal overlap, a, is simulated in the range 20-80 Å, with b fixed at 0 Å, h at 4 Å and angular displacement set to θ = (0,0,0). As depicted in Figure 3a and previously reported [36], R k decreases with larger horizontal overlap following a power law, because this allows enhanced van der Waals interactions between GNRs and thus better phononic heat transfer [44]. A similar behaviour is observed for varying values of vertical overlap (b tested in the range 0-18 Å, with a fixed at 40 Å, h at 4 Å and θ = (0,0,0)), since less overlapping area (i.e., higher b) leads to a power increase of R k (see Figure 3b).…”

Section: Resultssupporting

confidence: 73%

“…In fact, above the percolation threshold, R k at filler-filler interfaces has a fundamental role in determining the effective thermal conductivity of PNCs, since direct contact between contiguous fillers takes place [43]. Fasano et al have studied the effect of geometry and filler functionalization on the overall thermal transmittance of networks of carbon nanotube fillers [44]. In particular, they noticed that the thermal resistance at the filler-filler interface strongly decays with both the overlapping area and concentration of covalent cross-linkers between adjacent carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer at the Interface of Graphene Nanoribbons with Different Relative Orientations and Gaps

et al. 2019

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Because of their high thermal conductivity, graphene nanoribbons (GNRs) can be employed as fillers to enhance the thermal transfer properties of composite materials, such as polymer-based ones. However, when the filler loading is higher than the geometric percolation threshold, the interfacial thermal resistance between adjacent GNRs may significantly limit the overall thermal transfer through a network of fillers. In this article, reverse non-equilibrium molecular dynamics is used to investigate the impact of the relative orientation (i.e., horizontal and vertical overlap, interplanar spacing and angular displacement) of couples of GNRs on their interfacial thermal resistance. Based on the simulation results, we propose an empirical correlation between the thermal resistance at the interface of adjacent GNRs and their main geometrical parameters, namely the normalized projected overlap and average interplanar spacing. The reported correlation can be beneficial for speeding up bottom-up approaches to the multiscale analysis of the thermal properties of composite materials, particularly when thermally conductive fillers create percolating pathways.

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Section: Resultssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Heat Transfer at the Interface of Graphene Nanoribbons with Different Relative Orientations and Gaps

et al. 2019

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“…First, opposite trends are noticeable re-garding the relation between thermal conductivity and decreasing particle size: (1) a decrease of thermal conductivity because of the increase in the overall solid-liquid interface effects [45,[126][127][128][129][130][131] (Fig. 4); (2) an increase of thermal conductivity because of the nanolayer effect and the increase of random motion of nanoparticles, which promotes the creation of percolation paths [89,98,[132][133][134].…”

Section: Thermal Properties Of Nanofluidsmentioning

confidence: 99%

A review on the heat and mass transfer phenomena in nanofluid coolants with special focus on automotive applications

Bigdeli

Fasano

Cardellini

et al. 2016

Renewable and Sustainable Energy Reviews

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116

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Engineered suspensions of nanosized particles (nanofluids) may be characterized by enhanced thermal properties. Due to the increasing need for ultrahigh performance cooling systems, nanofluids have been recently investigated as next-generation coolants for car radiators. However, the multiscale nature of nanofluids implies nontrivial relations between their design characteristics and the resulting thermo-physical properties, which are far from being fully understood. In this work, the role of fundamental heat and mass transfer mechanisms governing thermo-physical properties of nanofluids is reviewed, both from experimental and theoretical point of view. Particular focus is devoted to highlight the advantages of using nanofluids as coolants for automotive heat exchangers, and a number of design guidelines is reported for balancing thermal conductivity and viscosity enhancement in nanofluids. We hope this review may help further the translation of nanofluid technology from small-scale research laboratories to industrial application in the automotive sector.

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“…Later, Shen and coworkers 35 investigated the ITC in epoxy resin/graphene nanocomposites, as a function of the chemical functionalization of graphene, and showed that the highest ITC reduction occurs with triethylenetetramine moieties, because of their ability to penetrate in the epoxy resin and form covalent bonds. On the other hand, the thermal conductance associated with filler-filler contacts, in this work referred to as Thermal Boundary Conductance (TBC), was also studied numerically by various authors, specifically between carbon nanotubes and graphene platelets surface-functionalized with small bridging groups such as oxygen or methylene bridges [36][37][38][39] , short alkyl chains 40 or benzene 41 . TBC of alkyl molecular junctions covalently bound between two graphene flakes was investigated in details by Li and coworkers 40 Recently, we also reported NEMD simulations of edge-to-edge alkyl junctions between graphene nanoribbons 42 , where covalent bonding was compared to Van der Waals forces between interpenetrating molecules.…”

Section: Introductionmentioning

confidence: 99%

Aromatic molecular junctions between graphene sheets: a molecular dynamics screening for enhanced thermal conductance

et al. 2019

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The proper design and synthesis of molecular junctions for the purpose of establishing percolative networks of conductive nanoparticles represent an opportunity to develop more efficient thermallyconductive nanocomposites, with several potential applications in heat management. In this work, theoretical classical molecular dynamics simulations were conducted to design and evaluate thermal conductance of various molecules serving as thermal bridges between graphene nanosheets. A wide range of molecular junctions was studied, with a focus on the chemical structures that are viable to synthesize at laboratory scale. Thermal conductances were correlated with the length and mechanical stiffness of the chemical junctions. The simulated tensile deformation of the molecular junction revealed that the mechanical response is very sensitive to small differences in the chemical structure. The analysis of the vibrational density of states provided insights into the interfacial vibrationalproperties. A knowledge-driven design of the molecular junction structures is proposed, aiming at controlling interfacial thermal transport in nanomaterials. This approach may allow for the design of more efficient heat management in nanodevices, including flexible heat spreaders, bulk heat exchangers and heat storage devices.©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

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Thermal transmittance of carbon nanotube networks: Guidelines for novel thermal storage systems and polymeric material of thermal interest

Cited by 36 publications

References 86 publications

Heat Transfer at the Interface of Graphene Nanoribbons with Different Relative Orientations and Gaps

Heat Transfer at the Interface of Graphene Nanoribbons with Different Relative Orientations and Gaps

A review on the heat and mass transfer phenomena in nanofluid coolants with special focus on automotive applications

Aromatic molecular junctions between graphene sheets: a molecular dynamics screening for enhanced thermal conductance

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