Superhydrophobic coatings using

LAMP BLACK

Category: C3 Level: UG

Protective coatings

• Hydrophobic coatings• Anti-corrossion• Scratch resistant• Anti-icing• Heat resistant

Lamp black coatings

• Carbon micro/nanostructures • No hazardous chemicals• Environment friendly• Low cost/ cost effective• Easy synthesis

Experimental

• Castor Oil and cotton wick• Substrates used: 1. Aluminium

2. Copper• Dimensions of substrate ≈ 2 cm x 5 cm• Manual deposition• Deposition time: 5 min

Photograph of coatings

Scanning Electron Microscopy

A1 C1Porosity: Reason for hydrophobicity

Scanning Electron Microscope Laboratory, Physics Instrumentation Facility Centre (PIFC),Department Of Physics, Shivaji University Kolhapur-416004, MS (India).

Thickness of coatings

Coating Thickness of coating (µm)

A1 11.7

C1 13.6

A2 8.9

C2 6.0

𝒕=𝒎𝟐−𝒎𝟏

𝝆 𝑨

Contact angle measurementθ = 117° θ = 135°

θ = 140° θ = 142°

Sliding angleSA = 15°

SA = 9°

A2

C2

Comparison of contact angles

Coating Contact angle Sliding angleA1 117° -C1 135° -A2 140° 15°C2 142° 9°

Video of excellent hydrophobic nature of C2 coating

Conclusion

• Lamp black coatings show superhydrophobic character.

• C2 coating on oil layered copper substrate showed contact angle of 142° while sliding angle of 9°.

• These coatings can be applied as anti-corrosion coatings.

Issues to be worked on

• Adhesion to substrate• Performance under high velocity water flow• Impact of abrasion

Thank you

References

• 1• 2• 3• .• ,• .

Correlation of roughness and C.A.