Kirigami-processed cellulose nanofiber films for smart heat dissipation by convection
Kirigami-processed cellulose nanofiber films for smart heat dissipation by convection
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DOI：
10.1038/s41427-021-00329-5
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发表时间：
2021-09
影响因子：
9.7
通讯作者：
K. Uetani;Keitaro Kasuya;Jiahao Wang;Yintong Huang;R. Watanabe;S. Tsuneyasu;T. Satoh;Hirotaka Koga;M. Nogi
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文献类型：
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作者：
K. Uetani;Keitaro Kasuya;Jiahao Wang;Yintong Huang;R. Watanabe;S. Tsuneyasu;T. Satoh;Hirotaka Koga;M. Nogi
散热在电子产品中变得越来越重要。传统的对流冷却系统具有显著的材料和尺寸限制，并且它们难以满足下一代智能电子产品的散热、小型化和灵活性要求。在这里，我们使用kirigami（传统的剪纸艺术）与导热纤维素薄膜，通过对流散热提出了一个灵活的冷却系统。通过拉伸kirigami产生的Amikazari（网状装饰）图案，并允许空气以3.0 m/s的速度通过其孔进行对流，热阻降低到没有kirigami和对流时的约五分之一。kirigami孔定义的出口空气速度，导致显着增加的传热系数。我们的kirigami散热概念使电子设计能够使用各种薄膜材料作为形状可变的冷却结构，这将激发广泛的热工程和电子应用。
Heat dissipation has become increasingly important in electronics. Conventional convection cooling systems have significant material and dimensional constraints, and they have difficulty meeting the heat dissipation, miniaturization, and flexibility requirements of next-generation smart electronics. Here, we used kirigami (the traditional art of paper cutting) with a thermally conductive cellulose nanofiber film to propose a flexible cooling system through convective heat dissipation. By stretching theAmikazari(net decoration) pattern produced by kirigami and allowing air convection through its aperture at 3.0 m/s, the thermal resistance was reduced to approximately one-fifth of that without kirigami and convection. The kirigami apertures defined the outlet air velocity, resulting in a significant increase in the heat-transfer coefficient. Our kirigami heat dissipation concept enables the design of electronics using a variety of film materials as shape-variant cooling structures, which will inspire a wide range of thermal engineering and electronics applications.