Chen Hui, Garemark Jonas, Li Lengwan, Nero Mathias, Ritter Maximilian, Cheung Ocean, Willhammar Tom, Sychugov Ilya, Li Yuanyuan, Berglund Lars A
Wallenberg Wood Science Center, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, 100 44, Sweden.
Wood Materials Science, Institute for Building Materials, ETH Zürich, Zürich, 8093, Switzerland.
Small. 2025 Feb;21(5):e2406749. doi: 10.1002/smll.202406749. Epub 2024 Dec 17.
Transparent wood composites provide new functionalities through active additives distributed at the nanoscale. Scalable nanotechnology includes processing where nanoparticles and molecules are brought into the dense wood cell wall. A novel cell wall swelling step through green chemistry is therefore investigated. Sub-zero centigrade NaOH treatment provides extensive cell wall swelling. Cell wall accessibility is vastly increased so that chemicals can readily impregnate the nanostructured cell wall. Transparent wood with a thickness of up to 15 mm can therefore be fabricated. The optical transmittance and the attenuation coefficient are improved since the polymer is distributed inside the cell wall as a matrix for the nanoscale cellulose fibrils. The proposed technology paves the way for scalable wood nanoengineering.
透明木材复合材料通过分布在纳米尺度的活性添加剂提供新功能。可扩展的纳米技术包括将纳米颗粒和分子引入致密木材细胞壁的加工过程。因此，研究了一种通过绿色化学实现的新型细胞壁膨胀步骤。零下摄氏度的氢氧化钠处理可使细胞壁大幅膨胀。细胞壁的可及性大大提高，从而使化学物质能够轻松地浸渍纳米结构的细胞壁。因此，可以制造出厚度达15毫米的透明木材。由于聚合物作为纳米级纤维素原纤维的基质分布在细胞壁内，因此提高了光学透过率和衰减系数。所提出的技术为可扩展的木材纳米工程铺平了道路。
