Transcript
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.
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