Hydrophobic coating for nanomaterilas

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 θ < 90
• Hydrophobic θ > 90
• Super hydrophobic θ > 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 Effect–Super 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

15. TestedApplications
CoatedCables Uncoated Cables

16. TestedApplications
Uncoated ReferenceSampleModified SHCoating

17. Thank You