Biomimetic design of flexible wood film combined with thermochromism and self-luminescence for enhanced energy-saving
Biomimetic design of flexible wood film combined with thermochromism and self-luminescence for enhanced energy-saving
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DOI：
10.1016/j.est.2023.109536
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发表时间：
2023-12
影响因子：
9.4
通讯作者：
Shichao Feng;Xiaodong Qin;Dongying Hu
中科院分区：
文献类型：
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作者：
Shichao Feng;Xiaodong Qin;Dongying Hu
本研究从木材的“钢筋混凝土”式化学结构出发，结合树皮和韧皮部的宏观结构，设计并构建了层状仿生木材薄膜。具体而言，通过使用具有毛细管渗透的脱木质素木材（DE），采用一种简单的策略，用于固定二醇共晶相变组分与木材中的智能变色/显色浸出。“钢筋混凝土”结构解决了由于分子键合较强而容易渗漏、强度较弱的问题。仿生木质膜具有较高的相变焓（155.5 J/g）和适宜的相变温度（29.9 °C）。在此基础上，以PVA/甘油为柔性基体，作为木材的内层树皮和连接各层的韧皮部，以PVA/甘油/PLO-8 C为关键的自发光节能材料，作为木材的外层树皮，通过仿生的方式，重构出具有较高机械强度（65.53 MPa）的柔性自发光节能木材薄膜。通过颜色的变化，可以直观地判断相变过程和当前环境温度。在50次吸收和发光循环后，表面形貌和发光强度也没有受到影响。该研究为基于PCM的仿生木结构智能化强化增能的应用提供了更广阔的发展方向。
In this research, the layered bionic wood films were designed and constructed inspired by the “reinforced concrete”-like chemical structure of wood combined with the macrostructure of bark and phloem. Specifically, a simple strategy for immobilizing diol eutectic phase change components with intelligent discoloration/chromogenic leaching in wood by using delignification wood (DE) with capillary penetration was adopted. The “reinforced concrete” structure solves the problem of easy leakage and weak strength due to strong molecular bonding. The bionic wood film has a high phase change enthalpy (155.5 J/g) and suitable phase change temperature (29.9 °C). On this basis, combined with PVA/glycerol as a flexible matrix as the inner bark of wood and phloem connecting each layer, combined with PVA/glycerol/PLO-8C as a key self-luminescent energy-enriched material as the outer bark of wood, the flexible and self-luminescent energy-saving wood films were reconstructed in a biomimetic way with a high mechanical strength (65.53 MPa). Through the change of color, the phase transition process and the current ambient temperature can be intuitively judged. The surface morphology and luminescence intensity were also not affected after 50 cycles of absorption and luminescence. This study provides a broader development direction for the application of intelligent enhanced energy enrichment of PCM-based on bionic wood construction.