Superhydrophobic Surface by Replication of Laser Micromachined Pattern in Epoxy/Alumina Nanoparticle Composite

Superhydrophobic surfaces were obtained by superposition of microstructure—defined by replication of laser micromachined masters, with nanostructure—created by durable epoxy/γ-Al2O3 nanoparticle composite, used for replication. Hierarchical surface topography thus obtained consisted of hexagonally s...

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Bibliographic Details
Published in:Journal of nanomaterials 2014-01, Vol.2014 (2014), p.1-11
Main Authors: Celichowski, Grzegorz, Grobelny, Jaroslaw, Marczak, Jacek, Psarski, Maciej
Format: Article
Language:English
Subjects:
Aluminum
Contact angle
Epoxy resins
Hydrophobic surfaces
Lasers
Microcavities
Micromachining
Micromechanics
Microstructure
Nanocomposites
Nanomaterials
Nanostructure
Plasma etching
Radio frequencies
Replication
Topography
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Summary:Superhydrophobic surfaces were obtained by superposition of microstructure—defined by replication of laser micromachined masters, with nanostructure—created by durable epoxy/γ-Al2O3 nanoparticle composite, used for replication. Hierarchical surface topography thus obtained consisted of hexagonally spaced microcavities and nanoparticle agglomerates, exposed on the replica surface by radio frequency (RF) air plasma etching. Surface topography was further enhanced by rims around the microcavity edges, resulting from nanosecond laser micromachining defects in aluminum masters. Subsequent wet chemical hydrophobization with 1H,1H,2H,2H-perfluorotetradecyltriethoxysilane (PFTDTES) provided superhydrophobic behavior in replicas with a microcavity spacing of 30 μm, as indicated by a water contact angle of 160° and a sliding angle of 8°. The preparation method is relatively simple, inexpensive, and potentially scalable.
ISSN:1687-4110
1687-4129
DOI:10.1155/2014/547895