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A Simple Nanocellulose Coating for Self‐Cleaning upon Water Action: Molecular Design of Stable Surface Hydrophilicity
Author(s) -
Huang Shu,
Wang Dayang
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201703913
Subject(s) - nanocellulose , coating , materials science , chemical engineering , monolayer , cellulose , isotropy , nanotechnology , composite material , physics , engineering , quantum mechanics
Abstract 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.