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Thermally Conductive Bamboo Macrofibres for Sustainable and Low-cost Cooling Textiles
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DOI：10.1039/D6TA02656G.png)
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Abstract
En 中文
The development of sustainable cooling textiles is of growing interest for personal thermal comfort and for mitigating the environmental footprint of synthetic fibers. Yet; most natural fibers suffer from the inherently low thermal conductivity; limiting their capacity for efficient personal cooling. Here; we report a facile and scalable top-down strategy for producing single; continuous bamboo macrofibres via peroxyformic acid-assisted mild delignification followed by water-assisted air drying. The resulting bamboo macrofibres exhibit a highly ordered hierarchical microstructure with a crystallinity of 67.2 % and an exceptional Hermans orientation factor of 0.95; yielding high tensile strength (1.4 ± 0.2 GPa) and Young’s modulus (46.7 ± 6.7 GPa). Direct current self-heating measurements reveal an intrinsic thermal conductivity of ~1.4 W/m-K at 300 K; which is among the highest values reported for natural fibers to date. This remarkable thermal conductivity arises from densely packed; highly crystalline; and well-aligned cellulose nanofibrils; which facilitate efficient heat conduction along the fiber axis. Importantly; fabrics woven from the bamboo macrofibres exhibit rapid heat uptake and efficient in-plane thermal diffusion; demonstrating effective translation of the intrinsic fiber-level thermal transport properties to the textile scale. Furthermore; a preliminary economic assessment reveals a low laboratory-scale fabrication cost of ~0.13 USD/g; suggesting strong potential for cost competitiveness upon scale-up. This study reveals the intrinsically high thermal conductivity of bamboo macrofibres; elucidates a clear microstructure-thermal transport relationship; and highlights bamboo macrofibres as a sustainable; low-cost; and high-performance building block for next-generation cooling textiles.
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