Superhydrophobic durable coating based on UV-photoreactive silica nanoparticles

T. Nahum, H. Dodiuk, A. Dotan, S. Kenig, J. P. Lellouche

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations


Superhydrophobic surfaces with contact angle (CA) >150 and sliding angle (SA) <10 have been aroused curiosity over the years due to their various applications. Superhydrophobicity can be obtained tailoring the chemistry and the roughness of the surface, mimicking the Lotus flower. Most superhydrophobic surfaces based on secondary bonding lose their roughness in harsh conditions and are unsuitable for practical applications. Photoreactive SiO2 nanoparticles (NPs) based on benzophenone (BP) can be a very effective tool for formation of reactive species that function as a molecular bridge by covalent bonding between the NP and any polymer matrix with C-C and C-H bonds. The present work focused on thermoset radiation curing urethane acrylate. Upon UV irradiation reactive excited nπ∗ triplet benzophenone species are formed and react through hydrogen abstraction to form ketyl radicals which interact with a radicals from the UV irradiated polymer matrix to yield covalent bonding. Roughness was achieved by dipping the substrate in SiO2@BPs NPs dispersion followed by irradiation. Fluoroalkylsilane was used to obtain hydrophobic top layer. AFM nano manipulation was used to verify the immobilization of NPs. Evaluation of durability was made using air flow at 300 km/hr. Preliminary results indicate the formation of super hydrophobic surfaces (CA>150 and SA<10) with improved stability.

Original languageEnglish
Title of host publicationProceedings of PPS-30
Subtitle of host publicationThe 30th International Conference of the Polymer Processing Society - Conference Papers
EditorsSadhan C. Jana
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735413092
StatePublished - 22 May 2015
Event30th International Conference of the Polymer Processing Society, PPS 2014 - Cleveland, United States
Duration: 6 Jun 201412 Jun 2014

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference30th International Conference of the Polymer Processing Society, PPS 2014
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2015 AIP Publishing LLC.


  • Functional coatings
  • Hydrophobic coatings
  • UV-photoreactive silica nanoparticles


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