Protein-based flexible thermal conductive materials with continuous network structure: Fabrication, properties, and theoretical modeling
Protein-based flexible thermal conductive materials with continuous network structure: Fabrication, properties, and theoretical modeling
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DOI：
10.1016/j.compositesb.2020.108377
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发表时间：
2020-11
影响因子：
13.1
通讯作者：
Ye Xue;S. Lofland;Xiao Hu
中科院分区：
文献类型：
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作者：
Ye Xue;S. Lofland;Xiao Hu
蛋白质以其天然丰富、高弹性和优良的生物相容性成为绿色和生物电子产品中许多合成成分的理想替代品。在这里，我们报告了新的可再生热管理材料的开发基于生物相容性丝素蛋白（SF）蛋白与少量（≤25体积%）AlN夹杂物的稳定复合系统。水退火促进了AlN颗粒与SF的自组装，增强了相之间的氢键，减少了界面处的声子散射。所合成的蛋白质复合材料具有优异的热稳定性、高机械耐久性和低线性膨胀，这部分与丝蛋白的二级结构有关，其可以通过改变AlN含量来调节。在有效介质理论下分析和建模了材料的物理性质，除了热导率比模型预测的大得多之外，其他的一致性都是合理的（例如，在15体积%时大5倍），这归因于蛋白质和AlN之间的强相互作用，AlN的高导热性，以及在较高浓度下形成的AlN颗粒的连续网络。这使得蛋白质成为导热复合材料的优秀候选者，其在可植入生物医学设备、柔性和可持续传感器以及绿色传热产品中具有许多新兴应用。
Protein is an ideal alternative to many synthetic components in green and bio-electronic products due to its natural abundance, high flexibility and excellent biocompatibility. Here, we report the development of new renewable thermal management materials based on a stable composite system of biocompatible silk fibroin (SF) protein with a small amount (≤25 vol%) of AlN inclusions. The self-assembly of AlN particles and SF was promoted by water annealing to enhance the hydrogen bonding between the phases to reduce the phonon scattering at the interface. The synthesized protein composites have excellent thermal stability, high mechanical durability and low linear expansion, related in part to the secondary structure of silk protein which can be modulated by changing the AlN content. The physical properties were analyzed and modeled within effective medium theory, and the agreements were reasonable, except for the thermal conductivity which was surprisingly much larger than predicted by the model (e.g. 5 times greater at 15 vol%), which is attributed to the strong interaction between protein and AlN, the high thermal conductivity of AlN, and the continuous network of AlN particles that formed at higher concentrations. This makes proteins excellent candidates for thermally conductive composite materials, which have many emerging applications in implantable biomedical devices, flexible and sustainable sensors, and green heat transfer products.