Superhydrophobic Hierarchical Structures from Self-Assembly of Cellulose-Based Nanoparticles
Superhydrophobic Hierarchical Structures from Self-Assembly of Cellulose-Based Nanoparticles
复制标题
纤维素基纳米颗粒自组装的超疏水分层结构
DOI：
10.1021/acssuschemeng.1c03876
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发表时间：
2021-10-14
影响因子：
8.4
通讯作者：
Wang, Yonggui
中科院分区：
文献类型：
--
作者：
Tang, Xiangyu;Huang, Wei;Wang, Yonggui
利用生物基纳米纤维素构建具有定制功能的新型结构的研究在过去几年中引起了广泛关注。与大多数从亲水性纳米级纤维素开始的研究不同，在本报告中使用具有不同取代度（DS）的十一碳烯酸纤维素酯（UCE）来构建（超）疏水涂层。DS为1.9的UCE 1.9由平均尺寸为112.8 nm的球形纳米颗粒（NP）组成。根据固态C-13核磁共振（NMR）光谱，UCE 1.9中存在结晶纤维素核。自组装通过溶剂交换过程将UCE1.9 NPs变成微粒（MP）。分散在乙醇中的自组装UCE 1.9 MP通过喷涂均匀分布在不同的基底上，形成具有微/纳米级分级结构的超疏水表面，其表现出大于150 °的静态水接触角和小于10 °的滑动角。所制备的超疏水表面在暴露于酸性或碱性条件和高温下时保持其原始的超疏水性。此外，由DS为3的UCE 3分子链构建的UCE 3纳米颗粒在加入UCE 1.9 MP涂层后极大地提高了机械稳定性，这通过砂纸摩擦和胶带剥离测试来评估。因此，这些新的（超）疏水涂层衍生自可持续纤维素是有前途的候选人，用于构建可生物降解的超疏水材料。
The research of using bio-based nanocellulose to construct novel structures with tailored functions has attracted wide attention over the past few years. Unlike most of the studies starting with hydrophilic nanoscaled cellulose, undecenoate cellulose esters (UCEs) with different degrees of substitution (DSs) are used in this report to construct (super)hydrophobic coatings. UCE1.9 with a DS of 1.9 is composed of spherical nanoparticles (NPs), which have an average size of 112.8 nm. A crystalline cellulose core is present within UCE1.9 according to solid-state C-13 nuclear magnetic resonance (NMR) spectroscopy. Self-assembly turned UCE1.9 NPs into microparticles (MPs) via a solvent-exchange process. The self-assembled UCE1.9 MPs dispersed in ethanol are well distributed on diverse substrates by spray coating to form superhydrophobic surfaces with micro/nanoscale hierarchical structures, which showed static water contact angles larger than 150 degrees and sliding angles less than 10 degrees. The prepared superhydrophobic surface holds its original superhydrophobicity when exposed to acidic or alkaline conditions and high temperatures. Moreover, UCE3 NPs constructed by UCE3 molecule chains with a DS of 3 tremendously enhanced the mechanical stability after addition into UCE1.9 MPs coatings, which was evaluated through sandpaper rubbing and tape peeling tests. Thus, these novel (super)hydrophobic coatings derived from sustainable cellulose are promising candidates for constructing biodegradable superhydrophobic materials.