Crystallization induced realignment of carbon fibers in a phase change material to achieve exceptional thermal transportation properties

Li, Maohua; Li, Linhong; Qin, Yue; Wei, Xianzhe; Kong, Xiangdong; Zhang, Zhenbang; Xiong, Shaoyang; Do, Hainam; Greer, James C.; Pan, Zhongbin; Cai, Tao; Dai, Wen; Lin, Cheng‐Te; Jiang, Nan; Yu, Jinhong

doi:10.1039/d1ta09056a

Cited by 30 publications

(19 citation statements)

References 51 publications

(56 reference statements)

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“…FT-IR spectra with the reflection method shown in Figure c were applied to characterize the composition of PCG samples. The most apparent difference in the FT-IR spectra between PEG and S4 is the signal of carboxyl belonging to PAA at 1727 cm –1 , which corroborates that there is no obvious chemical interaction between PAA and PEG . Compared to the pure PEG, S4 exhibits two main characteristic diffraction peaks appearing at ca.…”

Section: Resultsmentioning

confidence: 57%

“…The most apparent difference in the FT-IR spectra between PEG and S4 is the signal of carboxyl belonging to PAA at 1727 cm −1 , which corroborates that there is no obvious chemical interaction between PAA and PEG. 55 Compared to the pure PEG, S4 exhibits two main characteristic diffraction peaks appearing at ca. 18.9 and 23.1°c orresponding to the (120) and (032) planes of PEG, respectively, indicating that the introduction of PAA has no effect on the crystal type of PEG (Figure 3d).…”

Section: Physicochemical Structure Of Pcgsmentioning

confidence: 99%

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Leakage-Proof Flexible Phase Change Gels with Salient Thermal Conductivity for Efficient Thermal Management

Cao

et al. 2022

ACS Appl. Mater. Interfaces

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Phase change materials (PCMs) as one of the most potential latent heat storage techniques have been widely used for thermal management and energy storage. However, simultaneously imparting flexibility, high thermal conductivity, and considerable energy storage density to organic PCMs remains challenging. In this work, a coupling strategy combining substance exchange and magnetic orientation has been proposed to fabricate phase change gels (PCGs) with thermally induced flexibility and high through-plane thermal conductivity. In the PCGs, synthesized boron nitride/ferroferric oxide (BN@Fe3O4) particles and polyacrylic acid (PAA) precursor liquid are introduced to polyethylene glycol (PEG) aqueous solution, and a magnetic field is applied in the process of PAA network construction to promote ordered arrangement of BN@Fe3O4 along the direction of the magnetic field. Consequently, PEG is wrapped by the cross-linked PAA supporting network, forming PCGs with excellent shape stability and thermally induced flexibility. The vertical orientation structure of BN@Fe3O4 endows the PCGs with an enhanced through-plane thermal conductivity of up to 1.07 W m–1 K–1 at a BN@Fe3O4 loading of 25.6 wt % with an additional enhancement of 215% compared to the composite without BN. The thermally conductive leakage-proof PCGs present great application potential in heat storage and management.

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Section: Resultsmentioning

confidence: 57%

Section: Physicochemical Structure Of Pcgsmentioning

confidence: 99%

Leakage-Proof Flexible Phase Change Gels with Salient Thermal Conductivity for Efficient Thermal Management

Cao

et al. 2022

ACS Appl. Mater. Interfaces

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“…The addition of PU provides better crystal nucleation conditions, so the crystallization temperature difference becomes wider, leading to the melting temperature difference becoming wider too. MXene and graphene can accelerate the heat exchange, thereby affecting the melting temperature [ 39 ]. The range of melting and crystallization temperatures become narrow.…”

Section: Resultsmentioning

confidence: 99%

Interconnected MXene/Graphene Network Constructed by Soft Template for Multi-Performance Improvement of Polymer Composites

et al. 2022

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The multi-functionalization of polymer composites refers to the ability to connect multiple properties through simple structural design and simultaneously achieve multi-performance optimization. The large-scale design and mass production to realize the reasonable structure design of multifunctional polymer composites are urgently remaining challenges. Herein, the multifunctional MXene/graphene/polymer composites with three-dimensional thermally and electrically conductive network structures are fabricated via the utilization of the microstructure of the soft template, and a facile dispersion dip-coating approach. As a result, the polymer composites have a multi-performance improvement. At the MXene and graphene content of 18.7 wt%, the superior through-plane thermal conductivity of polymer composite is 2.44 W m−1 K−1, which is 1118% higher than that of the polymer matrix. The electromagnetic interference (EMI) shielding effectiveness of the sample reaches 43.3 dB in the range of X-band. And the mechanical property of the sample has advanced 4 times compared with the polymer matrix. The excellent EMI shielding and thermal management performance, along with the effortless and easy-to-scalable producing techniques, imply promising perspectives of the polymer composites in the next-generation smart electronic devices.

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“…Carbon fibers (CFs) composed of graphene-like carbon, as a submillimeter scale thermal conductive filler, can relieve the interfacial thermal resistance caused by size-effect. − Zeng et al proposed an aligned CFs-based composite with high thermal conductivity, where the CFs network was constructed by a unidirectional freezing technique . Yu et al prepared CFs/phase change material composites with a vertically oriented structure via freeze casting . More significantly, the CFs cloth (CFC) woven from long CFs further enhanced the long-range ordered conductivity of heat due to its increased aspect ratio and orderly arrangement.…”

Section: Introductionmentioning

confidence: 99%

“…3 Yu et al prepared CFs/phase change material composites with a vertically oriented structure via freeze casting. 11 More significantly, the CFs cloth (CFC) woven from long CFs further enhanced the long-range ordered conductivity of heat due to its increased aspect ratio and orderly arrangement. The multifunctional and flexible CFC@ZnO/ AgNWs/PVA composites with high thermal conductivity performance were fabricated using a typical hydrothermal method by Huang et al 12 Zhang et al developed the anisotropic thermal conductivity of the 2D CFs/epoxy woven composites through comparing different woven structures.…”

Section: Introductionmentioning

confidence: 99%

Design of Interconnected Carbon Fiber Thermal Management Composites with Effective EMI Shielding Activity

Qian

Yan

et al. 2022

ACS Appl. Mater. Interfaces

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Heat dissipation efficiency and electromagnetic interference (EMI) shielding performance are vital to integration, miniaturization, and application of electronic devices. Flexible and designable polymer-based composites are promising candidates but suffer from unavoidable interfacial thermal resistances, anisotropic thermal conductivity, and low shielding of EMI limiting application. Herein, multifunctional epoxy resin (EP)-based composites with an interconnected carbon fibers (CFs) network structure containing a low thermal resistance interfacial were prepared by high-temperature calcination and infiltration. The coherent heat and electron transfer pathways constructed with self-oriented CFs cloth connected by carbon nanotubes (CNTs) converted from leaf-shaped zeolitic imidazolate frameworks (ZIF-L) and stable magnetic property provided by cobalt nanoparticles contained in the CNTs made composites to an integrated in-plane thermal conductivity of up to 7.50 W m −1 K −1 , a through-plane thermal conductivity of 1.96 W m −1 K −1, and an EMI shielding effectiveness of 38.4 dB. Furthermore, the mechanical properties of CFs and the junction effect of CNTs endowed the composites with stability of mechanical property, thermal conductivity, and EMI shielding effectiveness after multiple bendings. The finite element simulation further verified the advantage of CFs network linked by CNTs on heat transfer. This work provides the desired design for the construction of a multifunctional polymer-based composite used in advanced electronic equipment.

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Crystallization induced realignment of carbon fibers in a phase change material to achieve exceptional thermal transportation properties

Abstract: Considering the significant threat of heat to electronic equipment and the heat dissipation problems existing in powerful systems, thermal management materials are in high demand. In conjunction with the increasing...

Cited by 30 publications

References 51 publications

Leakage-Proof Flexible Phase Change Gels with Salient Thermal Conductivity for Efficient Thermal Management

Leakage-Proof Flexible Phase Change Gels with Salient Thermal Conductivity for Efficient Thermal Management

Interconnected MXene/Graphene Network Constructed by Soft Template for Multi-Performance Improvement of Polymer Composites

Design of Interconnected Carbon Fiber Thermal Management Composites with Effective EMI Shielding Activity

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