Aerogels are commonly used in the fields of thermal insulation, sound insulation, adsorption, optical devices, and electrode materials. However, traditional aerogels suffer from poor structural stability and mechanical performance. Herein, we proposed a method in extracting fibers from hemp stems to prepare hydrophobic, thermal insulating and superelastic aerogels. The suspension of bleached hemp fibers (BHF), chitosan, and methyltrimethoxysilane (MTMS) is assembled into the network structure of aerogel by freeze-drying method. Because of the cross-linking between BHF, chitosan and MTMS, the material exhibited excellent properties. The aerogel demonstrated excellent compression performance, quickly recovering even when applied with 80 % compressive strain and maintaining 80 % of its original shape after 100 compression cycles. Furthermore, the aerogels demonstrated outstanding thermal insulation property; the thermal conductivity is only 0.01873 ± 0.0004 W/m·K. In addition, the aerogel exhibited excellent hydrophobic properties, with a water contact angle of approximately 130°. The superior properties of aerogel enable it to withstand complex external environments. In this study, we aim to provide new ideas and methods for resource reuse and the preparation of bio-based aerogels.

中文翻译：

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源自大麻茎的具有隔热、弹性和疏水性的多功能气凝胶


气凝胶常用于隔热、隔音、吸附、光学器件、电极材料等领域。然而，传统气凝胶的结构稳定性和机械性能较差。在此，我们提出了一种从大麻茎中提取纤维来制备疏水、隔热和超弹性气凝胶的方法。将漂白大麻纤维（BHF）、壳聚糖和甲基三甲氧基硅烷（MTMS）的悬浮液通过冷冻干燥方法组装成气凝胶的网络结构。由于BHF、壳聚糖和MTMS之间的交联，该材料表现出优异的性能。该气凝胶表现出优异的压缩性能，即使施加 80% 的压缩应变也能快速恢复，并在 100 次压缩循环后保持 80% 的原始形状。此外，气凝胶表现出优异的隔热性能；导热系数仅为0.01873±0.0004W/m·K。此外，气凝胶表现出优异的疏水性能，水接触角约为130°。气凝胶的优越性能使其能够承受复杂的外部环境。本研究旨在为资源再利用和生物基气凝胶的制备提供新的思路和方法。