Low‐Cost and Scaled‐Up Production of Fluorine‐Free, Substrate‐Independent, Large‐Area Superhydrophobic Coatings Based on Hydroxyapatite Nanowire Bundles

Published on Jan 9, 2018in Chemistry: A European Journal4.857
· DOI :10.1002/CHEM.201703894
Fei-Fei Chen14
Estimated H-index: 14
(CAS: Chinese Academy of Sciences),
Zi-Yue Yang3
Estimated H-index: 3
(ECUST: East China University of Science and Technology)
+ 5 AuthorsRi-Long Yang13
Estimated H-index: 13
(CAS: Chinese Academy of Sciences)
Sources
Abstract
Up to date, the scaled-up production and large-area applications of the superhydrophobic coatings are limited because the complicated procedures, environmentally harmful fluorinated compounds, restrictive substrates, expensive equipments and raw materials are usually involved in the fabrication process. Herein, we report the facile, low-cost and green production of the superhydrophobic coatings based on hydroxyapatite nanowire bundles (HNBs). Hydrophobic HNBs are synthesized by one-step solvothermal method using oleic acid as the structure-directing and hydrophobic agent. During the reaction process, highly hydrophobic C-H groups of oleic acid molecules can be in-situ attached to the surface of HNBs by the chelate interaction between Ca2+ ions and carboxylic groups. This facile synthesis method allows the scaled-up production of HNBs up to ~8 litres, which is the largest production scale of the superhydrophobic paint based on HNBs ever reported. In addition, we also show the design of the 100-litre reaction system. The HNBs can be coated on any substrate with an arbitrary shape by the spray coating technique. The self-cleaning ability in air and oil, high-temperature stability, and excellent mechanical durability of the as-prepared superhydrophobic coatings are demonstrated. More importantly, The HNBs are coated on the large-sized practical objects to form large-area superhydrophobic coatings.
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