Yan Ruihan, Huang Zan, Chen Ying, Zhang Li, Sheng Xinxin
Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
School of Naval Architecture and Ocean Engineering, Guangzhou Maritime University, Guangzhou, Guangdong 510725, China.
Int J Biol Macromol. 2024 Oct;277(Pt 2):134233. doi: 10.1016/j.ijbiomac.2024.134233. Epub 2024 Jul 28.
With the increasingly rapid pace of updates and iterations in electronic devices, electronic equipment/systems are becoming progressively intricate, aiming to achieve swift responsiveness through higher packaging density, which leads to electromagnetic interference and brings along with it heat accumulation, the creation of new composite phase change materials with efficient thermal management capabilities integrated with excellent electromagnetic interference shielding capabilities is imminent. In this study, nickel foam/lignin/rGO dual network scaffolds (LGN) with high electrical conductivity were prepared by vacuum-assisted adsorption, freeze-drying, and thermal annealing, and then PEG was encapsulated in LGN by vacuum impregnation to obtain shape-stabilized PEG/NiF/LN-rGO (PLGN) composite phase change material. The results demonstrate that the prepared PLGNs exhibit robust stability, exceptional thermal management capabilities, and commendable electromagnetic interference (EMI) shielding effectiveness (SE). Among these composites, PLGN-3 stands out with a notably high energy storage density, featuring a melting enthalpy of 140.95 J/g and a relative enthalpy efficiency of 98.72%. Benefiting from its outstanding electrical conductivity (1597.5 S/cm for PLGN-3) and superior light absorption, the PLGN composite phase change material also demonstrates highly effective photothermal and electrothermal conversion capabilities. In addition, the EMI shielding effectiveness reaches up to 69.9 dB at 8.2-12.4 GHz. In conclusion, the synthesized PLGN composite phase change material demonstrates considerable promise for mitigating electromagnetic interference and facilitating thermal energy management in electronic devices.
随着电子设备更新迭代的速度日益加快，电子设备/系统变得越来越复杂，旨在通过更高的封装密度实现快速响应，这导致了电磁干扰并随之带来热量积累，因此迫切需要开发具有高效热管理能力并兼具优异电磁干扰屏蔽能力的新型复合相变材料。在本研究中，通过真空辅助吸附、冷冻干燥和热退火制备了具有高电导率的泡沫镍/木质素/rGO双网络支架（LGN），然后通过真空浸渍将PEG封装在LGN中，得到形状稳定的PEG/NiF/LN-rGO（PLGN）复合相变材料。结果表明，所制备的PLGN具有强大的稳定性、卓越的热管理能力和值得称赞的电磁干扰（EMI）屏蔽效能（SE）。在这些复合材料中，PLGN-3表现突出，具有显著高的储能密度，其熔化焓为140.95 J/g，相对焓效率为98.72%。得益于其出色的电导率（PLGN-3为1597.5 S/cm）和优异的光吸收性能，PLGN复合相变材料还展现出高效的光热和电热转换能力。此外，在8.2 - 12.4 GHz频率下，EMI屏蔽效能高达69.9 dB。总之，合成的PLGN复合相变材料在减轻电子设备中的电磁干扰和促进热能管理方面显示出巨大的潜力。
