In this study, metallic wood-based phase change material (MWM) with high performance anisotropic thermal conductivity and energy storage capacity was developed by impregnating wood with myristic acid, and subsequent introducing low melting point alloy (LMA) into the wood through a facile alternating high and low temperature heat treatment. The heat-driven LMA was rapidly squeezed into the cell lumens of the wood so as to effectively inhibit the leakage of the internal myristic acid during melting. Benefited with the well-aligned and hierarchical porous structure, the filled LMA formed a continuous heat transfer network along the highly oriented transport tissue of wood, which could greatly reduce the interfacial thermal resistance and promote heat transfer. Compared with untreated wood, the thermal conductivity of MWM in longitudinal and radial directions were improved by more than 67 % and 75 %, respectively. In addition, it exhibited superior energy storage capability, with the latent heat of 90.23 J/g and 86.42 J/g during melting and solidification. The thermal stability and anti-leakage performance were satisfied. The phase change temperatures, enthalpies and chemical structure of MWM remained unchanged after 100 thermal cycles, demonstrating outstanding cycling reliability. With excellent energy storage performance and favourable thermal conductivity, the prepared MWM shows a promising application in energy saving buildings and solid wood floors.

中文翻译：

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金属木质相变材料，具有卓越的各向异性导热性和储能能力


在本研究中，通过用肉豆蔻酸浸渍木材，然后通过简单的高低温交替热处理将低熔点合金 （LMA） 引入木材中，开发了具有高性能各向异性导热和储能能力的金属木材基相变材料 （MWM）。热驱动的 LMA 被迅速挤压到木材的细胞腔中，从而有效抑制熔化过程中内部肉豆蔻酸的泄漏。得益于排列整齐、层次分明的多孔结构，填充的 LMA 沿着木材高度定向的运输组织形成了连续的传热网络，可以大大降低界面热阻并促进传热。与未处理的木材相比，MWM 在纵向和径向上的导热率分别提高了 67% 和 75% 以上。此外，它表现出优异的储能能力，在熔化和凝固过程中的潜热分别为 90.23 J/g 和 86.42 J/g。热稳定性和防泄漏性能得到满足。MWM 的相变温度、焓和化学结构在 100 次热循环后保持不变，表现出优异的循环可靠性。凭借优异的储能性能和良好的导热性，制备的 MWM 在节能建筑和实木地板中显示出广阔的应用前景。