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Transparent and durable SiO 2 ‐containing superhydrophobic coatings on glass
Author(s) -
Li Fang,
Du Miao,
Zheng Qiang
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41500
Subject(s) - contact angle , materials science , wetting , coating , superhydrophobic coating , spin coating , chemical engineering , molar ratio , silicone , composite material , chemistry , organic chemistry , catalysis , engineering
ABSTRACT We fabricated novel superhydrophobic coatings based on SiO 2 nanoparticles combined with NH 2 ‐terminated silicone (SN 2 ) or SN 2 ‐modified polyurethane (SN 2 ‐prePU) by alternately spin‐coating them onto glass slides. The final fabricated surface contained SN 2 /SiO 2 or SN 2 ‐prePU/SiO 2 bilayers. The conditions of spin‐coating method were also explored. SN 2 ‐prePU with different SN 2 /prePU molar ratios were synthesized to study the influence of SN 2 ratio on the water contact angles of ultimate spin‐coated surfaces. The surface was found to be tunable from hydrophobic to superhydrophobic by choosing SN 2 ‐prePU with different SN 2 /prePU molar ratios or SN 2 content. Water droplets easily rolled off on these superhydrophobic surfaces. Surfaces coated with SN 2 /SiO 2 bilayers showed better transparency, whereas surfaces coated with SN 2 ‐prePU(2 : 1)/SiO 2 bilayers exhibited better durability. Droplets of varied pH were prepared to test the anti‐wettability of the coatings. Results showed that the as‐coated surfaces had stable superhydrophobicity to droplets with pH values ranging from 1 to 14. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41500.