Hydrophobic coatings
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This document discusses hydrophobic coatings and provides information on: 1. The group members working on hydrophobic coatings and definitions of hydrophobicity relating to a material's ability to repel water based on its contact angle. 2. Techniques for synthesizing hydrophobic coatings including sol-gel synthesis, molecular beam epitaxy, surface functionalization, and chemical vapor deposition. 3. Potential applications of hydrophobic coatings in de-icing, anti-fogging, self-cleaning, and anti-wetting and how this can provide benefits like increased lifespan and usability of substrates.
Hydrophobic coatings
- 1. Hydrophobic Coatings Group Members Waleed Waqas Niaz Muhammad Hasan Mazhar Tanveer Afzal Naz Farhan Ali
- 2. HYDROPHOBICITY Hydrophobicitycomesfrom the greekword Hydro(water) Phobicity (fear). It refers to the physicalproperty of a material that repels water. Waxes, oil and fats.
- 3. Contact angle Hydrophilic 慮 < 90 Hydrophobic 慮 > 90 Super hydrophobic 慮 > 150 Rougheningahydrophobic surface increases the effective contactangle.
- 4. HYDROPHOBIC COATING The process of coating the surface of a material with hydrophobic material in order to avoid sticking of liquids on that surface. This is absolutely unique way of coating unlike conventional which shrink continuously during drying to produce low porosity films. Super hydrophobic technology makes water bounce, it stops it, rolls it off the surface.
- 5. Lotus EffectSuper hydrophobicity Lotus leaf depicts Super hydrophobicity Contact angle >150 Adroplet on a superhydrophobic surface: The droplet touches the leave only in a few points and forms into a ball. It completely rolls off at the slightestdeclination.
- 6. Synthesis Techniques Sol-Gel Synthesis
- 7. Synthesis Techniques Molecular Beam Epitaxy
- 8. Synthesis Techniques Surface Functionalization Chemical Vapour Deposition Self Assembled Monolayers (SAMs)
- 9. Substrates Metal Glass Polymers Composites
- 10. Materials for Coating Silicanano-coating Precipitated calciumcarbonate Zincoxide polystyrene (ZnO/PS)nano-composite Manganese oxide polystyrene (MnO2/ PS)nano-composite
- 11. ContactAngleMeasurement Goniometer for ContactAnglemeasurements
- 12. ScanningElectronMicroscope Surfacemorphology Surfacestructure size/particle sizemeasurement Surfaceelemental analysis
- 13. Problems Marine Pipe Corrosion: $276billion residential plumbing costs AircraftDeicing: $5,000peraircraft BridgeCorrosion: Annual cost of USBridges:$7billion PowerLines: Onewinter storm -$5billion
- 14. Industrial Significance and Prospects De-Icing Anti-fogging Safer and better functional products Higher capacity of heat exchangers Application Sectors Coating Properties IndustrialSignificance Self-cleaning Increase life span of the substrates Reduce labour cost involved in cleaning Improve the usability and functionality of substrates Anti-wetting Increase transmission of light, esp. in solar panels Increase life span of the substrates Prevent contamination Improve the usability and functionality of substrates
- 17. Thank You