Heat dissipation in graphene foams

Cohen, Yehonatan; Reddy, Siva K.; Ya’akobovitz, Assaf

doi:10.1007/s12274-020-3120-2

Cited by 7 publications

(7 citation statements)

References 27 publications

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“…Researchers have therefore sought to develop heat dissipation materials that are capable of tackling this problem of heat generation efficiently. [17][18][19][20][21][22] Rho et al 23 have synthesized porous Cu-graphene high dissipation heterostructures. Swain and Brahma reported a copper-based potential heat dissipating material.…”

Section: Introductionmentioning

confidence: 99%

“…Phase change materials and heat dissipation materials are pivotal in solar energy utilization and to enhance the efficiency of photovoltaic panels by eliminating the excess heat produced. Researchers have therefore sought to develop heat dissipation materials that are capable of tackling this problem of heat generation efficiently 17‐22 . Rho et al 23 have synthesized porous Cu‐graphene high dissipation heterostructures.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization of imidazole‐based copper complex mixtures and study of their thermal behaviour

et al. 2021

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Herein, the synthesis, characterization and thermal behaviour of imidazole-based two copper-phosphate mixtures, A = Cu 2 (PO 4 )(OH)ÁCu(HPO 4 )(H 2 O)Á(C 3 H 4 N 2 ) 2 . 3.25 H 2 O and B = Cu 3 (PO 4 ) 2 H 2 OÁ(C 3 H 4 N 2 ) 3 (H 2 O)Á0.1(C 3 H 4 N 2 ).3.25 H 2 O are reported. The characterization was done by adopting various electro-analyticaltechniques such as elemental analysis, X-ray Powder Diffraction (XRD), Thermogravimetric Analysis (TGA) and Derivative Thermogravimetry (DTG), Fourier Transform Infrared (FT-IR) Spectrometry, Absorption Spectrophotometry and Ultraviolet-Visible and near Infrared (UV-Vis-NIR). Differential Scanning Calorimetry performed with the heating rate 10 K/min from 297.96 to 770.46 K in normal atmosphere for both mixtures. DSC data indicated that both mixtures A and B are exhibiting exothermic property by their net specific heat capacities (C p ) −11.11 and −2.83 J/g K, respectively. Therefore, these complex mixtures can be utilized as heat dissipation materials. Both mixtures A and B undergo phase change in terms of hydrated phase to dehydrated phase up to 356 and 392 K, respectively. The specific heat capacity of Mixture A during hydration, C p = 2.54 J/g K, is higher than the tin, lead, stainless steel, glass and aluminium at their respective melting points. This mixture is also found better than the commercial product based on lithium ion battery in terms of specific heat capacity. From UV-Vis-NIR analysis, it is found that the mixtures A and B are showing semiconducting behaviour with band gaps 1.66 and 1.68 eV, respectively. The average crystallite sizes of these nano-complex mixtures are 35.29 and 30.94 nm and these were calculated using the Debye-Scherrer equation and Williamson-Hall method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization of imidazole‐based copper complex mixtures and study of their thermal behaviour

et al. 2021

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“…These foams integrate the 2D material that they consist of to form a configuration of a 3D network composed of hollow thin-wall layered branches and junctions with large surface area and low mass. Because graphene foam (GF) shows low mass density, superelasticity, − good electrical conductivity, electrochemical stability, and high energy dissipation, it has been successfully incorporated into advanced applications, such as electrochemical capacitors, strain sensors, electromagnetic shields, thermal devices, and resonators . Recent studies on boron nitride foam (BNF) have shown important physical properties as well, including thermal insulation (i.e., low thermal conduction), high surface area, and a tunable dielectric constant .…”

Section: Introductionmentioning

confidence: 99%

Multiscale Elasticity of 3D Boron Carbonitride Foam for Tunable Mechanical Resisting Devices

Jahn,

Levavi,

Pradhan

et al. 2023

ACS Appl. Nano Mater.

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Boron carbonitride (BCN) foam is a three-dimensional material with a hierarchical structure, which has promising potential due to its semiconducting properties and high surface area. However, the lack of understanding of its elastic properties impedes its large-scale integration into advanced applications. We grew BCN foam samples with different atomic compositions and studied their microscopic- and macroscopic-scale mechanics, which revealed that samples with high concentrations of carbon have lower elastic resistance across different scales (i.e., lower Young’s moduli). While the microscopic elasticity is dominated by interlayer interactions, the macroscopic elasticity is also strongly influenced by the buckling and fracturing of the three-dimensional structure of the BCN foam, and thus, the macroscopic Young’s moduli are lower than the microscopic ones. Our findings shed light on the mechanism that underlies the multiscale mechanics of BCN foam and pave the path toward its integration into tunable mechanical resisting devices such as flexible electronic devices and resonators.

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“…As GF shows high mechanical compliance [4], piezoresistive behavior [5], and unique electrochemical characteristics [6], it was integrated as a core element into miniaturized resonators [7], tactile sensors [8], and electrochemical sensors [6]. Thermally, GF has demonstrated low thermal interface resistance [9], high thermal conduction [10,11], high coefficient of free thermal convection [12], and high mechanical stability under high temperatures [10].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer of graphene foams and carbon nanotube forests under forced convection

Cohen

Ya’akobovitz

2022

Nanotechnology

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The effective dissipation of heat from electronic devices is essential to enable their long-term operation and their further miniaturization. Graphene foams (GF) and carbon nanotube (CNT) forests are promising materials for thermal applications, including heat dissipation, due to their excellent thermal conduction and low thermal interface resistance. Here, we study the heat transfer characteristics of these two materials under forced convection. We applied controlled airflow to heated samples of GF and CNT forests while recording their temperature using infrared micro-thermography. Then, we analyzed the samples using finite-element simulations in conjunction with a genetic optimization algorithm, and we extracted their heat fluxes in both the horizontal and vertical directions. We found that boundary layers have a profound impact on the heat transfer characteristics of our samples, as they reduce the heat transfer in the horizontal direction. The heat transfer in the vertical direction, on the other hand, is dominated by the material conduction and is much higher than the horizontal heat transfer. Accordingly, we uncover the fundamental thermal behavior of GF and CNT forests, paving the way toward their successful integration into thermal applications, including cooling devices.

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Heat dissipation in graphene foams

Cited by 7 publications

References 27 publications

Synthesis, characterization of imidazole‐based copper complex mixtures and study of their thermal behaviour

Synthesis, characterization of imidazole‐based copper complex mixtures and study of their thermal behaviour

Multiscale Elasticity of 3D Boron Carbonitride Foam for Tunable Mechanical Resisting Devices

Heat transfer of graphene foams and carbon nanotube forests under forced convection

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