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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-469-4

ISBN Online: 978-1-56700-470-0

Second Thermal and Fluids Engineering Conference
April, 2-5, 2017, Las Vegas, NV, USA

SELF-CLEANING PROPERTIES VIA CONDENSATION ON SUPERHYDROPHOBIC SURFACES

Get access (open in a dialog) pages 1807-1816
DOI: 10.1615/TFEC2017.fnn.017708

要約

Recent research regarding superhydrophobic (SH) surfaces has been focused on the principles of condensation on SH surfaces and the self-cleaning properties exhibited by SH surfaces. This research seeks to combine and expand these two aspects of SH surfaces to investigate the efficiency of self-cleaning properties during condensation. These SH surfaces are created by a combination of a SH chemical coating and nano-rib structure. Surfaces were contaminated with sea salt, tobacco residue, and pollen, placed in a controlled humid environment, and cooled below the dew point temperature. Condensed microdroplets were allowed to grow and coalesce large enough to roll off the surface, removing from the surface all other condensed droplets in its path and ideally all contaminates in that same path. The static contact angle (CA) and sliding angle (SA) were measured before and after each condensation cycle and compared to the CA and SA of a clean surface that had gone through similar condensation cycles. This data was used to then approximate the cleaning efficiency of the SH surface. Furthermore, these measurements were compared to the CA and SA of contaminated surfaces after a single droplet and multiple droplets rolled over the surface. From this study, we determine that depending on the contaminate, condensed droplets that roll off a contaminated SH surface is a viable way to remove contaminates from that SH surface.