CNT-assisted design of stable liquid metal droplets for flexible multifunctional composites

Yi, Shuangqin; Sun, He; Jin, Yi-Fei; Zou, Kangkang; Li, Jie; Jia, Li‐Chuan; Yan, Ding‐Xiang; Li, Zhong‐Ming

doi:10.1016/j.compositesb.2022.109961

Cited by 51 publications

(27 citation statements)

References 51 publications

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“…However, as shown in Figure c, the reflection coefficient ( R ) values were much higher than the absorption coefficient ( A ) values. These results indicated that BC-GNP revealed the reflection-dominant shielding mechanism …”

Section: Resultsmentioning

confidence: 75%

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

Fan

Song

et al. 2023

ACS Appl. Nano Mater.

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With the flourishing development of wireless communication, there is an urgent need for flexible and robust materials with excellent thermal conductivity (TC) and electromagnetic interference (EMI) shielding performance through simple and green preparation. In this work, we efficiently prepared bacterial-cellulose-reinforced graphite nanoplate (BC-GNP) composite films by the vacuum filtration of BC/GNP mixture dispersions. Compared with the pure GNP film with a loose and disordered structure, the BC-GNP composite showed a highly aligned and compact “brick-and-mortar” structure. Benefiting from the unique structure, the resultant BC-GNP with 20 wt % BC (20%BC) exhibited a high tensile strength of 47.3 ± 1.8 MPa and an electrical conductivity of 76.9 ± 3.3 S/cm. As expected, the 20%BC showed excellent EMI shielding effectiveness (EMI SE) of 36.4 dB and a specific EMI SE (SSE/t) value of 8860 ± 400 dB·cm2/g with a thickness of 38 ± 1 μm. The in-plane TC and anisotropy index could reach up to 80.2 ± 6.4 W/mK and 73 ± 3, respectively. The 20%BC also exhibited a satisfactory Joule heating performance of 139 °C at a voltage of 6 V. More importantly, the 20%BC possessed a biodegradable property, which would completely degrade after 5 days. Thus, this work provides a strategy to facilely prepare biodegradable, high-performance, and multifunctional materials for wearable devices.

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Section: Resultsmentioning

confidence: 75%

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

Fan

Song

et al. 2023

ACS Appl. Nano Mater.

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“…Specifically, the evenly distributed CNT fillers can overlap each other easily due to the high aspect ratio to form 3D conductive networks, which can accelerate the electron hopping/migrating and induce eddy currents under stimulation by alternating electromagnetic fields, thus further converting microwave energy into heat by conductive loss. − Moreover, apart from the overlapped CNT fillers, the interface with a small region between the adjacent CNT fillers and PI polymers can be regarded as the CNT-resin-CNT heterogeneous interfaces, and the plenty of above heterogeneous interfaces between adjacent CNT fillers can form capacitor-like structures where the accumulated and unevenly distributed free electrons at both capacitors ends effectively improve the interfacial polarization relaxation. The possessed abundant polarization sites also play an essential role in polarization loss. − Eventually, the optimized porous architectures can be obtained by regulating component parameters and the CNT fillers content according to foaming kinetics, which enhances the impedance matching and improves the dielectric loss ability of PI foam. Therefore, the CNT/PI foam expresses high-efficiency MA performance with ultrabroad EAB and comparable RL min values.…”

Section: Resultsmentioning

confidence: 99%

Mechanically Reinforced Rigid Polyimide Foam via Chemically Grafting Isocyanate Acid for Ultrabroad Band Microwave Absorption

Shi

Zou

et al. 2023

ACS Appl. Mater. Interfaces

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Polyimide (PI) foam with excellent microwave absorption (MA) performance and desirable compressive strength is highly critical and in demand in the structural MA components. Although the satisfactory MA performance of the present PI-based MA foams has been achieved by employing diverse methods, the relatively low compressive strength (∼KPa) restricted them from use as structural MA foams in practical application. Herein, isocyanate acid was introduced to the backbone of PI resin, which not only increased the PI backbone polarity and strength as rigid chain segment, but also served as a self-foaming component. The porous structure of PI foams was readily regulated by adjusting the water and carbon nanotube (CNT) filler contents of precursor dispersion. As a result of the improved polarity of the PI backbone resulted from the isocyanate group and high dielectric loss of CNT, the high compressive strength of 7.04 MPa and impressive MA property of the resultant PI foam with a low CNT loading ratio of 1.5 wt % were achieved, which were much higher than those reported previously. Especially, the effective absorption bandwidth (EAB) (RL < −10 dB) was up to 10.7 GHz (at the thickness of 3 mm), covering the C, X, and Ku bands simultaneously. Meanwhile, the EAB of the as-prepared PI foam retained 9.3 and 9.7 GHz even after being subjected to liquid nitrogen (−196 °C) and high temperature (300 °C) treatments due to the desirable stability of PI. In addition, the excellent thermal insulation resulted from the pores structure and low filler content was achieved, where the top surface only presented 60 °C after placing on 300 °C platform for 30 min. The high compressive strength, impressive MA property, and thermal insulation endowed the resultant CNT/PI foam with great potential application as structural MA foam in a harsh service environment.

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“…Heat dissipation is becoming more and more crucial for the reliability of modern electronics and power systems. − Polymers are usually used for thermal management, but their poor thermal conductivity (TC) can hardly meet the application requirement in modern electronics and power systems. − Recently, thermally conductive polymer composites (TCPCs) are developed to improve the TC of polymers. − Among these thermally conductive fillers, boron nitride nanosheets (BNNSs) stand out in view of their high intrinsic TC, excellent electrical insulation, and ease of synthesis. Solution or the melt blending method is widely adopted to yield the BNNS/polymer composites, in which BNNSs are randomly distributed in polymer matrices.…”

Section: Introductionmentioning

confidence: 99%

Scalable Polymer-Infiltrated Boron Nitride Nanoplatelet Films with High Thermal Conductivity and Electrical Insulation for Thermal Management

Wang

Ren

et al. 2022

ACS Appl. Electron. Mater.

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The development of thermally conductive polymer composites (TCPCs) of high filler loads holds great promise for thermal management in electronics and power systems. However, achieving high filler loads in TCPCs is still a great challenge because of the processing difficulties for the traditional melt blending or solution mixing methods. Herein, we proposed a scalable methodology to fabricate high-performance polymer-infiltrated boron nitride nanosheet (BNNS) composite films embedded with high filler loads for efficient thermal management. The polymer-infiltrated BNNS films exhibited excellent heat conduction performance, and the maximal in-plane thermal conductivity was as high as 20.65 W/(m·K), which was increased by 258% compared to that of the conventional BNNS/PU films with the identical BNNS content. Moreover, the polymer-infiltrated BNNS films also showed high electrical insulation, good mechanical performance, and excellent thermal stability. More importantly, the polymer-infiltrated BNNS films were demonstrated to have strong heat dissipation capability for thermal management in high-power light-emitting diode modules and power batteries. The findings provide valuable guidance for developing advanced TCPCs with high filler loads for thermal management.

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CNT-assisted design of stable liquid metal droplets for flexible multifunctional composites

Cited by 51 publications

References 51 publications

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

Mechanically Reinforced Rigid Polyimide Foam via Chemically Grafting Isocyanate Acid for Ultrabroad Band Microwave Absorption

Scalable Polymer-Infiltrated Boron Nitride Nanoplatelet Films with High Thermal Conductivity and Electrical Insulation for Thermal Management

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