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Wang N.,Nanjing University of Science and Technology | Wang N.,Jiangsu Key Laboratory of Advanced Micro nano Materials and Technologies | Xiong D.,Nanjing University of Science and Technology | Xiong D.,Jiangsu Key Laboratory of Advanced Micro nano Materials and Technologies | And 5 more authors.
Journal of Physical Chemistry C | Year: 2016

A suspension that can be sprayed onto substrates was developed to form a superhydrophobic/oleophilic surface. Lyophobic slippery surfaces were prepared by infusing perfluorinated lubricants into the superhydrophobic coating to repel almost all liquids with low surface tension values, including hexane, kerosene, and diesel oil, showing a transition between superoleophilicity and lyophobicity. In addition, the traveling speeds of liquids appeared to be negatively correlated with the kinematic viscosity. In the anti-icing tests, the droplet was pinned after contacting a 0 °C textured superhydrophobic surface for a few seconds because of the meniscus caused by the condensation of atmospheric humidity; by contrast, on the lyophobic slippery surface, a water droplet could easily slide even at -20 °C, demonstrating superior icing resistance. © 2016 American Chemical Society. Source


Wang N.,Nanjing University of Science and Technology | Wang N.,Jiangsu Key Laboratory of Advanced Micro nano Materials and Technologies | Lu Y.,University College London | Xiong D.,Nanjing University of Science and Technology | And 3 more authors.
Journal of Materials Chemistry A | Year: 2016

Lotus-inspired superhydrophobic coatings are usually mechanically weak and lack durability, this hinders their practical applications. A suspension that can be treated on various materials in any size and shape to form a mechanically durable superhydrophobic coating is developed, which retains water repellent properties after multiple cycles of abrasion, blade scratching, tape-peeling, repeated deformation, a series of environmental tests and recycling. Based on its superhydrophobicity under oil, two highly efficient systems were developed for oil purification-stirring and inverted cone systems. Small water drops converge on the coated surface that was immersed in oil through velocity-controlled stirring, or designing an inverted cone superhydrophobic surface under oil to collect water drops spontaneously. This coating can be readily used for practical applications to make a durable superhydrophobic coating that functions either in air or oils. © The Royal Society of Chemistry 2016. Source


Wang N.,Nanjing University of Science and Technology | Wang N.,Jiangsu Key Laboratory of Advanced Micro nano Materials and Technologies | Wang N.,Synergetic Research Center on Advanced Materials | Xiong D.,Nanjing University of Science and Technology | And 5 more authors.
ACS Applied Materials and Interfaces | Year: 2015

A superhydrophobic steel surface was prepared through a facile method: combining hydrogen peroxide and an acid (hydrochloric acid or nitric acid) to obtain hierarchical structures on steel, followed by a surface modification treatment. Empirical grid maps based on different volumes of H2O2/acid were presented, revealing a wettability gradient from "hydrophobic" to "rose effect" and finally to "lotus effect". Surface grafting has been demonstrated to be realized only on the oxidized area. As-prepared superhydrophobic surfaces exhibited excellent anti-icing properties according to the water-dripping test under overcooled conditions and the artificial "steam-freezing" (from 50 °C with 90% humidity to the -20 °C condition) test. In addition, the surfaces could withstand peeling with 3M adhesive tape at least 70 times with an applied pressure of 31.2 kPa, abrasion by 400 grid SiC sandpaper for 110 cm under 16 kPa, or water impacting for 3 h without losing superhydrophobicity, suggesting superior mechanical durability. Moreover, outstanding corrosion resistance and UV-durability were obtained on the prepared surface. This successful fabrication of a robust, anti-icing, UV-durable, and anticorrosion superhydrophobic surface could yield a prospective candidate for various practical applications. © 2015 American Chemical Society. Source


Wang N.,Nanjing University of Science and Technology | Wang N.,Jiangsu Key Laboratory of Advanced Micro nano Materials and Technologies | Wang N.,Synergetic Research Center on Advanced Materials | Xiong D.,Nanjing University of Science and Technology | And 6 more authors.
Applied Surface Science | Year: 2015

A superhydrophobic surface (SHS) was prepared on steel via the synergetic corrosion of H2O2 and H2SO4, followed by the modification of silanes. Flower-like hierarchical structures were obtained by the following two etching aspects: the non-uniform ions concentration around O2, and the selective corrosion for steel substrate. Surface grafting was manifested to preferentially be realized on the oxidized area, and the H2O2 is crucial for the grafting efficiency. Moreover, the resultant surface exhibited superior anti-icing property in extremely condensing condition. In addition, surface with C-F bond exhibited outstanding UV-durability. © 2015 Elsevier B.V. All rights reserved. Source

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