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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Ice-Templating Synthesis of Hierarchical and Anisotropic Silver- Nanowire-Fabric Aerogel and Its Application for Enhancing Thermal Energy Storage Composites
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Ice-Templating Synthesis of Hierarchical and Anisotropic Silver- Nanowire-Fabric Aerogel and Its Application for Enhancing Thermal Energy Storage Composites

机译：分层和各向异性银 - 纳米线 - 织物气凝胶的冰模拟合成及其增强热能储能复合材料的应用

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摘要

By bidirectionally freeze-casting silver nanowire (AgNW) suspension, we synthesized hierarchical AgNW aerogel (AgNWA). The AgNWA shows two hierarchical levels: (1) AgNW fabric-like ribbons of interlacing AgNWs and (2) axially and radially aligned assembly of AgNW ribbons. The AgNW ribbons are also connected by AgNW bridges. The AgNWAs have ultrahigh porosity (~99.7%) and anisotropic electrical and thermal properties. Furthermore, AgNWA is used to enhance phase change materials (PCMs) for high-efficiency thermal energy storage. AgNWA-paraffin PCM nanocomposite was synthesized by infiltrating the AgNWA with paraffin. The PCM composite shows anisotropic electrical conductivity, ~ 130% thermalefficiency enhancement, and strong reliability against thermal cycling. Moreover, the effective PCM composite's thermal capacity (latent heat) is also significantly enhanced, implying a strong AgNW-paraffin interfacial bonding. Thus, a hierarchical and anisotropic AgNWA is fabricated via a bidirectional freezecasting technique, and it can largely enhance the performance and reliability of PCMs. This provides important insights into the design of oriented three-dimensional network of nanomaterials and also thermal energy storage composites with high performance and reliability.
机译：通过双向冷冻铸造银纳米线（AgNW）悬浮液，我们合成了等级Agnw Airgel（Agnwa）。 Agnwa显示了两个层次级别：（1）轴向和径向对齐的AgNW丝带的互通Agnws和（2）的Agnw织物状丝带。 AGNW丝带也通过AGNW桥接连接。 Agnwas具有超高孔隙率（〜99.7％）和各向异性电气和热性能。此外，Agnwa用于增强相变材料（PCM）以进行高效热能存储。通过用石蜡浸润Agnwa来合成Agnwa-石蜡PCM纳米复合材料。 PCM复合材料显示各向异性导电性，〜130％的热量，增强，以及对热循环的强烈可靠性。此外，有效的PCM复合材料的热容量（潜热）也显着增强，暗示强烈的agnw-石蜡界面键合。因此，通过双向自由伸缩技术制造分层和各向异性Agnwa，并且可以在很大程度上提高PCM的性能和可靠性。这为纳米材料的面向三维网络设计提供了重要的见解，以及具有高性能和可靠性的热能存储复合材料。

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