Graphene Aerogel Templated Fabrication of Phase Change Microspheres as Thermal Buffers in Microelectronic Devices,ACS Applied Materials & Interfaces

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Graphene Aerogel Templated Fabrication of Phase Change Microspheres as Thermal Buffers in Microelectronic Devices
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-16 00:00:00 , DOI: 10.1021/acsami.7b13969
Xuchun Wang _{1,

2} , Guangyong Li ₁ , Guo Hong ₃ , Qiang Guo ₂ , Xuetong Zhang ₁

Affiliation

Phase change materials, changing from solid to liquid and vice versa, are capable of storing and releasing a large amount of thermal energy during the phase change, and thus hold promise for numerous applications including thermal protection of electronic devices. Shaping these materials into microspheres for additional fascinating properties is efficient but challenging. In this regard, a novel phase change microsphere with the design for electrical-regulation and thermal storage/release properties was fabricated via the combination of monodispersed graphene aerogel microsphere (GAM) and phase change paraffin. A programmable method, i.e., coupling ink jetting–liquid marbling–supercritical drying (ILS) techniques, was demonstrated to produce monodispersed graphene aerogel microspheres (GAMs) with precise size-control. The resulting GAMs showed ultralow density, low electrical resistance, and high specific surface area with only ca. 5% diameter variation coefficient, and exhibited promising performance in smart switches. The phase change microspheres were obtained by capillary filling of phase change paraffin inside the GAMs and exhibited excellent properties, such as low electrical resistance, high latent heat, well sphericity, and thermal buffering. Assembling the phase change microsphere into the microcircuit, we found that this tiny device was quite sensitive and could respond to heat as low as 0.027 J.

中文翻译：

石墨烯气凝胶模板化制造相变微球作为微电子器件中的热缓冲剂

从固体变为液体，反之亦然的相变材料能够在相变过程中存储和释放大量的热能，因此有望用于包括电子设备热保护在内的众多应用。将这些材料成型为微球以获得其他引人入胜的特性是有效的，但具有挑战性。在这方面，通过单分散石墨烯气凝胶微球（GAM）和相变石蜡的组合，制造了一种具有电调节和热存储/释放性能设计的新型相变微球。事实证明，一种可编程方法，即结合喷墨-液体大理石花纹-超临界干燥（ILS）技术，可生产出具有精确尺寸控制的单分散石墨烯气凝胶微球（GAM）。所得的GAM表现出超低密度，低电阻和高比表面积，仅约5倍。直径变化系数为5％，在智能开关中表现出良好的性能。相变微球是通过在GAM内部毛细管填充相变石蜡获得的，并表现出优异的性能，例如低电阻，高潜热，良好的球形性和热缓冲性。将相变微球体组装到微电路中，我们发现该微型设备非常灵敏，可以响应低至0.027 J的热量。相变微球是通过在GAM内部毛细管填充相变石蜡获得的，并表现出优异的性能，例如低电阻，高潜热，良好的球形性和热缓冲性。将相变微球体组装到微电路中，我们发现该微型设备非常灵敏，可以响应低至0.027 J的热量。相变微球是通过在GAM内部毛细管填充相变石蜡获得的，并表现出优异的性能，例如低电阻，高潜热，良好的球形性和热缓冲性。将相变微球体组装到微电路中，我们发现该微型设备非常灵敏，可以响应低至0.027 J的热量。

更新日期：2017-11-17

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