A Simple Nanocellulose Coating for Self-Cleaning upon Water Action: Molecular Design of Stable Surface Hydrophilicity
A Simple Nanocellulose Coating for Self-Cleaning upon Water Action: Molecular Design of Stable Surface Hydrophilicity
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DOI：
10.1002/anie.201703913
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发表时间：
2017-07-24
影响因子：
16.6
通讯作者：
Wang, Dayang
中科院分区：
文献类型：
--
作者：
Huang, Shu;Wang, Dayang
人们发现，通过物理沉积在固体表面涂覆纤维素纳米纤维(CNF)单分子膜，可以在水的作用下保持表面不含从粘性内燃机油到极性正丁醇的各种油。这种自清洁功能与CNF独特的分子结构密切相关，在CNF中，丰富的表面羧基和羟基均匀、密集、对称地排列，在结晶的纳米纤维素链上形成极性电晕。这种各向同性的核心-电晕配置为在分子水平上设计自清洁表面提供了新的、易于采用的指导。由于其出色的自清洁性能，CNF涂层将传统的网格转化为高效的油水分离膜，而不需要事先进行表面处理。
Coating solid surfaces with cellulose nanofibril (CNF) monolayers via physical deposition was found to keep the surfaces free of a variety of oils, ranging from viscous engine oil to polar n-butanol, upon water action. The self-cleaning function was well correlated with the unique molecular structure of the CNF, in which abundant surface carboxyl and hydroxy groups are uniformly, densely, and symmetrically arranged to form a polar corona on a crystalline nanocellulose strand. This isotropic core-corona configuration offers new and easily adoptable guidance to design self-cleaning surfaces at the molecular level. Thanks to its excellent self-cleaning behavior, the CNF coating converted conventional meshes into highly effective membranes for oil-water separation with no prior surface treatment required.