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Strong and Superhydrophobic Wood with Aligned Cellulose Nanofibers as a Waterproof Structural Material†
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-03-11 , DOI: 10.1002/cjoc.202000032 Yongfeng Li 1 , Chaoji Chen 1 , Jianwei Song 1 , Chunpeng Yang 1 , Yudi Kuang 1 , Azhar Vellore 2 , Emily Hitz 1 , Mingwei Zhu 1 , Feng Jiang 1 , Yonggang Yao 1 , Amy Gong 1 , Ashlie Martini 2 , Liangbing Hu 1
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-03-11 , DOI: 10.1002/cjoc.202000032 Yongfeng Li 1 , Chaoji Chen 1 , Jianwei Song 1 , Chunpeng Yang 1 , Yudi Kuang 1 , Azhar Vellore 2 , Emily Hitz 1 , Mingwei Zhu 1 , Feng Jiang 1 , Yonggang Yao 1 , Amy Gong 1 , Ashlie Martini 2 , Liangbing Hu 1
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Lightweight structural materials are important for the energy efficiency of applications, particularly those in the building sector. Here, inspired by nature, we developed a strong, superhydrophobic, yet lightweight material by simple in situ growth of nano‐SiO2 and subsequent densification of the wood substrate. In situ generation of SiO2 nanoparticles both inside the wood channels and on the wood surfaces gives the material superhydrophobicity, with static and dynamic contact angles of 159.4o and 3o, respectively. Densification of the wood to remove most of the spaces among the lumen and cell walls results in a laminated, dense structure, with aligned cellulose nanofibers, which in turn contributes to a high mechanical strength up to 384.2 MPa (7‐times higher than natural wood). Such treatment enables the strong and superhydrophobic wood (SH‐Wood) to be stable and have excellent water, acid, and alkaline resistance. The high mechanical strength of SH‐Wood combined with its excellent structural stability in harsh environments, as well its low density, positions the strong and superhydrophobic wood as a promising candidate for strong, lightweight, and durable structural materials that could potentially replace steel.
中文翻译：
具有对齐的纤维素纳米纤维作为防水结构材料的强力和超疏水木材†
轻质结构材料对于应用的能源效率非常重要，特别是在建筑领域。在这里，受自然界的启发，我们通过简单的纳米SiO 2原位生长和随后的木质基材致密化，开发了一种结实，超疏水，轻巧的材料。在木材通道内部和木材表面上均原位生成SiO 2纳米粒子，使材料具有超疏水性，其静态和动态接触角分别为159.4 o和3 o， 分别。木材的致密化可以去除管腔和细胞壁之间的大部分空间，从而形成层状致密的结构，并具有对齐的纤维素纳米纤维，从而有助于达到384.2 MPa的高机械强度（比天然木材高7倍） ）。这样的处理可以使坚固的超疏水木材（SH-Wood）稳定并具有出色的耐水，耐酸和耐碱性能。SH-Wood的高机械强度与在恶劣环境下的出色结构稳定性以及低密度相结合，使坚固且超疏水的木材成为坚固，轻巧和耐用的结构材料的有前途的候选者，可以潜在地替代钢。
更新日期：2020-03-11
中文翻译：
具有对齐的纤维素纳米纤维作为防水结构材料的强力和超疏水木材†
轻质结构材料对于应用的能源效率非常重要，特别是在建筑领域。在这里，受自然界的启发，我们通过简单的纳米SiO 2原位生长和随后的木质基材致密化，开发了一种结实，超疏水，轻巧的材料。在木材通道内部和木材表面上均原位生成SiO 2纳米粒子，使材料具有超疏水性，其静态和动态接触角分别为159.4 o和3 o， 分别。木材的致密化可以去除管腔和细胞壁之间的大部分空间，从而形成层状致密的结构，并具有对齐的纤维素纳米纤维，从而有助于达到384.2 MPa的高机械强度（比天然木材高7倍） ）。这样的处理可以使坚固的超疏水木材（SH-Wood）稳定并具有出色的耐水，耐酸和耐碱性能。SH-Wood的高机械强度与在恶劣环境下的出色结构稳定性以及低密度相结合，使坚固且超疏水的木材成为坚固，轻巧和耐用的结构材料的有前途的候选者，可以潜在地替代钢。
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