通过木材细胞壁纳米级重组获得坚固的形状记忆木质纤维素气凝胶,ACS Nano

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通过木材细胞壁纳米级重组获得坚固的形状记忆木质纤维素气凝胶
ACS Nano ( IF 15.8 ) Pub Date : 2023-01-30 , DOI: 10.1021/acsnano.2c11220
Jonas Garemark ₁ , Jesús E Perea-Buceta ₂ , Martin Felhofer ₃ , Bin Chen ₁ , Maria F Cortes Ruiz ₁ , Ioanna Sapouna _{1,

4} , Notburga Gierlinger ₃ , Ilkka Antero Kilpeläinen ₂ , Lars A Berglund ₁ , Yuanyuan Li ₁

Affiliation

聚合物形状记忆气凝胶 (PSMA) 作为先进的热绝缘体、致动器或传感器，在从航空航天到生物医学的各个应用领域都有前景。然而，具有良好机械性能的 PSMA 的制造具有挑战性，目前以化石基聚合物为主。在这项工作中，通过一步处理原生木材，制备了具有高比表面积（高达 220 m ² /g）和低径向导热系数（0.042 W/mK）的坚固形状记忆生物气凝胶。 [MTBD] ⁺ [MMP]的离子液体混合物^-/二甲基亚砜。气凝胶显示出与天然木材相似的化学成分。实现了细胞壁和内腔中木材生物聚合物的纳米级空间重排，产生了柔性水凝胶，为后续具有复杂几何形状的气凝胶提供了设计自由度。报道了水刺激下的形状记忆功能。利用共聚焦拉曼光谱、AFM、SAXS/WAXS、NMR、数字图像相关等对气凝胶的化学组成和分布、形貌和机械性能进行了仔细研究。凭借其简单、可持续和广泛的适用性，为纳米级木材重组开发的方法是生物基形状记忆气凝胶设计的进步。

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Strong, Shape-Memory Lignocellulosic Aerogel via Wood Cell Wall Nanoscale Reassembly

Polymer shape-memory aerogels (PSMAs) are prospects in various fields of application ranging from aerospace to biomedicine, as advanced thermal insulators, actuators, or sensors. However, the fabrication of PSMAs with good mechanical performance is challenging and is currently dominated by fossil-based polymers. In this work, strong, shape-memory bio-aerogels with high specific surface areas (up to 220 m²/g) and low radial thermal conductivity (0.042 W/mK) were prepared through a one-step treatment of native wood using an ionic liquid mixture of [MTBD]⁺[MMP]⁻/DMSO. The aerogel showed similar chemical composition similar to native wood. Nanoscale spatial rearrangement of wood biopolymers in the cell wall and lumen was achieved, resulting in flexible hydrogels, offering design freedom for subsequent aerogels with intricate geometries. Shape-memory function under stimuli of water was reported. The chemical composition and distribution, morphology, and mechanical performance of the aerogel were carefully studied using confocal Raman spectroscopy, AFM, SAXS/WAXS, NMR, digital image correlation, etc. With its simplicity, sustainability, and the broad range of applicability, the methodology developed for nanoscale reassembly of wood is an advancement for the design of biobased shape-memory aerogels.

更新日期：2023-01-30

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