Ice-templated graphene in-situ loaded boron nitride aerogels for polymer nanocomposites with high thermal management capability

Zhang, Siyi; Li, Maohua; Miao, Zhicong; Zhao, Yalin; Song, Yajing; Yu, Jinhong; Wu, Zhixiong; Li, Jiangtao; Wang, Wei; Li, Yong; Li, Laifeng

doi:10.1016/j.compositesa.2022.107005

Cited by 22 publications

(5 citation statements)

References 52 publications

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“…On the cold aluminum block, lots of ice crystals grew upward, which induced the h-BN@PDA microplatelets to be vertically arranged; after freezedrying, the residual SCMC acted as a binder to maintain the structural stability of the o-BN@PDA framework. 52 During the CVI welding process (Figure 1a 4 −a 5 ), first, PDA coating of h-BN@PDA microplatelets went through a thermal decomposition reaction and was converted into continuous carbon coatings, which supported the h-BN framework after SCMC thermal decomposition, and became the carbon source for CVI-SiC. Subsequently, at higher temperature, Si reacted with SiO 2 to form SiO gas, which was infiltrated into the o-BN@C frameworks and became the silicon source for the following CVI reactions: 48,53 SiO gas reacted with the carbon coating to generate a lot of SiC seeds (eq 1), which continued to grow until the carbon coating was completely transformed into SiC (eqs 1−3).…”

Section: Resultsmentioning

confidence: 99%

“…The fabrication process of oriented h-BN microplatelet frameworks via an ice-templated self-assembly method is shown in Figure a 2 ,a 3 . On the cold aluminum block, lots of ice crystals grew upward, which induced the h-BN@PDA microplatelets to be vertically arranged; after freeze-drying, the residual SCMC acted as a binder to maintain the structural stability of the o-BN@PDA framework . During the CVI welding process (Figure a 4 –a 5 ), first, PDA coating of h-BN@PDA microplatelets went through a thermal decomposition reaction and was converted into continuous carbon coatings, which supported the h-BN framework after SCMC thermal decomposition, and became the carbon source for CVI-SiC.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Nanoscale in Situ Interface Welding on the Macroscale Thermal Conductivity of Insulating Epoxy Composites: A Multiscale Simulation Investigation

Ding,

Huang,

Peng

et al. 2023

ACS Nano

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Insulating thermally conductive polymer composites are in great demand in integrated-circuit packages, for efficient heat dissipation and to alleviative short-circuit risk. Herein, the continuous oriented hexagonal boron nitride (h-BN) frameworks (o-BN@SiC) were prepared via self-assembly and in situ chemical vapor infiltration (CVI) interface welding. The insulating o-BN@SiC/epoxy (o-BN@SiC/EP) composites exhibited enhanced thermal conductivity benefited from the CVI-SiC-welded BN–BN interface. Further, multiscale simulation, combining first-principles calculation, Monte Carlo simulation, and finite-element simulation, was performed to quantitatively reveal the effect of the welded BN–BN interface on the heat transfer of o-BN@SiC/EP composites. Phonon transmission in solders and phonon–phonon coupling of filler–solder interfaces enhanced the interfacial heat transfer between adjacent h-BN microplatelets, and the interfacial thermal resistance of the dominant BN–BN interface was decreased to only 3.83 nK·m2/W from 400 nK·m2/W, plunging by over 99%. This highly weakened interfacial thermal resistance greatly improved the heat transfer along thermal pathways and resulted in a 26% thermal conductivity enhancement of o-BN@SiC/EP composites, compared with physically contacted oriented h-BN/EP composites, at 15 vol % h-BN. This systematic multiscale simulation broke through the barrier of revealing the heat transfer mechanism of polymer composites from the nanoscale to the macroscale, which provided rational cognition about the effect of the interfacial thermal resistance between fillers on the thermal conductivity of polymer composites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of Nanoscale in Situ Interface Welding on the Macroscale Thermal Conductivity of Insulating Epoxy Composites: A Multiscale Simulation Investigation

Ding,

Huang,

Peng

et al. 2023

ACS Nano

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“…6 Graphene-based flexible composites exhibit outstanding conductivity and thus have a significant potential for flexible wearable applications. 7− 11 These composites are typically prepared through direct growth via chemical vapor deposition or post-treatment techniques following solution synthesis; these techniques include solution mixing, 12,13 in situ polymerization, 14,15 and melt mixing. 16,17 The reinforcing graphene within a composite forms a random network structure, which has substantial contact resistance between graphene sheets.…”

Section: Introductionmentioning

confidence: 99%

“…The inherent rigidity of traditional metal electronic components presents limitations in their use, highlighting the importance of developing substrates with both good flexibility and conductivity . Graphene-based flexible composites exhibit outstanding conductivity and thus have a significant potential for flexible wearable applications. – These composites are typically prepared through direct growth via chemical vapor deposition or post-treatment techniques following solution synthesis; these techniques include solution mixing, , in situ polymerization, , and melt mixing. , The reinforcing graphene within a composite forms a random network structure, which has substantial contact resistance between graphene sheets . During thermal postprocessing, the distribution of graphene may exhibit a “coffee ring” effect. , The coffee ring effect is a phenomenon that occurs when a droplet of coffee or tea is deposited onto a surface, leaving behind a characteristic stain.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

Zhi,

Xu,

et al. 2023

ACS Appl. Nano Mater.

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Graphene is a promising reinforcement for fiber composite materials in flexible wearable applications because of its exceptional conductivity. Researchers have focused on bridging the gap between the intrinsic conductivity of graphene and the macroscopic performance of composite materials. The anisotropy of 2D nanomaterials indicates that their orientation and distribution are crucial factors in determining the macroscopic performance of thin films and bulk materials. Various technologies developed to control the formation of microstructures include electric and magnetic field methods, hot pressing, centrifugation, and freeze-drying. In this study, we prepared flexible graphene/cellulose composite film materials and used magnetic fields to regulate the orientation and distribution of graphene within cellulose paper. Results show that the grid structure of graphene arranged on the composite material produced interconnected conductive paths and reduced the graphene permeation threshold. By giving the conductive layer a higher dielectric constant, we prevented its breakdown as a conductive film. Electroluminescent devices were constructed using graphene/cellulose flexible composite materials and achieved an effective improvement in luminescence performance. Furthermore, directional luminescence was obtained through a microstructure design. This study provides a feasible path for using 2D nanomaterials in high-performance, flexible wearable devices.

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“…Among them, the ice-template method is extremely suitable for the preparation of the TIMs, which benefits from its low processing shrinkage, controllable porosity and superior mechanical strength. For example, Zhang et al [27] prepared 3D-BNNS/GR/EP by the ice template method, and the composites exhibited superior through-plane thermal conductivities of 2.23 W•m −1 •K −1 at a filler content of 11.2 vol%, demonstrating a 1073% thermal conductivity enhancement at room temperature (RT) compared with pure epoxy resin. Furthermore, adding a small amount of low-dimensional fillers as the second phase is also a common method to achieve high thermal conductivity since nanowires, whiskers and nanosheets with high aspect ratios are highly favorable for constructing fast pathways for phonon transport.…”

Section: Introductionmentioning

confidence: 99%

Oriented Three-Dimensional Skeletons Assembled by Si3N4 Nanowires/AlN Particles as Fillers for Improving Thermal Conductivity of Epoxy Composites

Wang,

Wan,

Niu

et al. 2023

Polymers

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With the miniaturization of current electronic products, ceramic/polymer composites with excellent thermal conductivity have become of increasing interest. Traditionally, higher filler fractions are required to obtain a high thermal conductivity, but this leads to a decrease in the mechanical properties of the composites and increases the cost. In this study, silicon nitride nanowires (Si3N4NWs) with high aspect ratios were successfully prepared by a modified carbothermal reduction method, which was further combined with AlN particles to prepare the epoxy-based composites. The results showed that the Si3N4NWs were beneficial for constructing a continuous thermal conductive pathway as a connecting bridge. On this basis, an aligned three-dimensional skeleton was constructed by the ice template method, which further favored improving the thermal conductivity of the composites. When the mass fraction of Si3N4NWs added was 1.5 wt% and the mass fraction of AlN was 65 wt%, the composites prepared by ice templates reached a thermal conductivity of 1.64 W·m−1·K−1, which was ~ 720% of the thermal conductivity of the pure EP (0.2 W·m−1·K−1). The enhancement effect of Si3N4NWs and directional filler skeletons on the composite thermal conductivity were further demonstrated through the actual heat transfer process and finite element simulations. Furthermore, the thermal stability and mechanical properties of the composites were also improved by the introduction of Si3N4NWs, suggesting that prepared composites exhibit broad prospects in the field of thermal management.

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Ice-templated graphene in-situ loaded boron nitride aerogels for polymer nanocomposites with high thermal management capability

Cited by 22 publications

References 52 publications

Effect of Nanoscale in Situ Interface Welding on the Macroscale Thermal Conductivity of Insulating Epoxy Composites: A Multiscale Simulation Investigation

Effect of Nanoscale in Situ Interface Welding on the Macroscale Thermal Conductivity of Insulating Epoxy Composites: A Multiscale Simulation Investigation

Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

Oriented Three-Dimensional Skeletons Assembled by Si3N4 Nanowires/AlN Particles as Fillers for Improving Thermal Conductivity of Epoxy Composites

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