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Superhydrophobicity and the Lotus Effect

Superhydrophobicity and the Lotus Effect. Bryan Cochran. water. Hydrophobic vs. Hydrophilic. Hydrophobic: “fear of water” Refers to the degree that water “beads up” on a surface Hydrophilic: “love of water” Refers to the degree that water “wets” or adheres to a surface.

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Superhydrophobicity and the Lotus Effect

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  1. Superhydrophobicity and the Lotus Effect Bryan Cochran

  2. water Hydrophobic vs. Hydrophilic Hydrophobic: • “fear of water” • Refers to the degree that water “beads up” on a surface Hydrophilic: • “love of water” • Refers to the degree that water “wets” or adheres to a surface hydrophobic surface water hydrophilic surface

  3. Contact Angle • Angle where water drop makes contact with the surface • Hydrophilic: θ < 90° • Hydrophobic: θ > 90° • Superhydrophobic: θ > 150°

  4. Polarity and Nano-roughness Polarity: • Opposites repel • Polar vs. Nonpolar (ie., Oil and Water) Nano-roughness: • Hydrophobic “tails” • Trapped air water air nano-roughened surface

  5. Practical & Real Life Applications Water sports Lotus Flower Rose Car Windshields Skiing

  6. Acknowledgements • http://www.nsec.ohio-state.edu/teacher_workshop/Superhydrophobicity.pdf • http://voh.chem.ucla.edu/classes/Superhydrophobic_Surfaces/pdf/Superhydro%20%20Presentation.pdf • http://www.iop.org/EJ/article/1468-6996/6/3-4/A05/STAM_6_3-4_A05.pdf?request-id=0f3098bb-6d01-4fd6-898d-bdede519f8b8 • http://en.wikipedia.org/wiki/Hydrophobic • http://www.wired.com/science/discoveries/magazine/16-11/st_infoporn# • http://inventorspot.com/articles/fioravanti_sees_future_no_windsh_11050

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