1. Method for Characterizing Icephobicity of Hydrophobic Coatings Jillian McManus Micro/Nanoscale Fluid Transport Lab- Dr. C. Megaridis 2010 UIC REU

2. Coating Properties  Hydrophobicity Governed By:  Surface Roughness (Hierarchical Microscale-to- Nanoscale Surface Texture)  Surface Energy  Icephobicity Governed By:  Unknown

3. Direction of Research  Investigate relationships between hydrophobicity and icephobicity  Hydrophobicity  Roll-off Angle  Contact Angle  Icephobicity  Freezing Delay Time (of a single ml droplet) resting on substrate  Prefabricated Substrates  1 st Round of Trials- Varying Surface Energies  2 nd Round of Trials- Varying Surface Roughness

4. Substrates  Variable Surface Energies  Teflon  Anodized Aluminum  Silica Rubber  Copper  Stainless Steel  Varying Surface Roughness  Aluminum (A..b..c roughness)  Teflon (a…b..c roughness)  Ultra Nanocrystalline Diamond

5. Experimental Setup 1.Oxygen Analyzer 2.Tubing to carry gas to oxygen analyzer 3.CCD Camera 4.Thermocouple (corresponds to temp. in needle) 5.Hot Plate and Container of De-ionized Water 6.Nitrogen Line 7.Calibrated Drop Dispenser (Yellow Tubing Connects to needle) 8.LED Lighting 9.Substrate Stage 10.Needle and inserted thermocouple wire 11.Secondary Thermometer 12.Foil for deflecting Nitrogen flow 13.Dessicating packs 14.Insulated Tubing for Droplet Delivery

6. Example Video of Droplet Freezing (Anodized Aluminum)

7. Scope  Aircrafts  Power lines  Ships

8. Acknowledgements  The National Science Foundation and The Department of Defense, EEC-NSF Grant # 0755115  Professor Takoudis and Professor Jursich, REU Program Directors  Professor Megaridis  Tom Schutzius and Arindam Das

9. Sources