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.
|Title of host publication||Proceedings of PPS-30|
|Subtitle of host publication||The 30th International Conference of the Polymer Processing Society - Conference Papers|
|Editors||Sadhan C. Jana|
|Publisher||American Institute of Physics Inc.|
|State||Published - 22 May 2015|
|Event||30th International Conference of the Polymer Processing Society, PPS 2014 - Cleveland, United States|
Duration: 6 Jun 2014 → 12 Jun 2014
|Name||AIP Conference Proceedings|
|Conference||30th International Conference of the Polymer Processing Society, PPS 2014|
|Period||6/06/14 → 12/06/14|
Bibliographical notePublisher Copyright:
© 2015 AIP Publishing LLC.
- Functional coatings
- Hydrophobic coatings
- UV-photoreactive silica nanoparticles