1. Self cleaning surface with dual
functionality
Super hydrophobicity
Photo catalytic activity
NISHANT KUMAR SONY
MTECH SOLID STATE TECHNOLOGY
INDIAN INSTITUTE OF KHARAGPUR
16PH62R03

2.  Self cleaning behavior
 Superhydrophobicity
 Photo catalytic activity
 Preparation of self cleaning surface
 Application
Content

3.  Various contaminants on the solid surface can be eliminated
naturally.
 Example of self cleaning behavior is lotus leaves surface-
Nano structured hydrophobic domain and micro meter-scale of
roughness superimpose, resulting surface having dual
functionality at the same time.
Self cleaning behavior

4.  Super hydrophobicity generally refers to the surface
with a water contact angle exceeding 150° .
 Water droplet on superhydrophobic surface can sweep
dust particle existing on the surface i.e. dust particle
existing on the surface can efficiently be removed
under rain.
 Superhydrophobicity is a macroscopic phenomena.
Super hydrophobicity

5.  Photocatalysis means acceleration of photoreaction
in presence of a catalyst.
 Photocatalytic activity depends on the ability of
catalyst to create electron hole pair.
 Photocatalytic material is generally wide band gap
semiconductor inorganic material.
 Organic molecule adsorb on photocatalytically active
surface, get decomposed by these strong oxidizing
agents and get transformed into H2O and CO2.
Photo catalytic activity

7.  SiO2 nanoparticle is coated on the glass surface with
poly dimethyl siloxane (PDMS).
 Heating the coated glass then PDMS molecules are
vaporized.
 Hydrophobic glass surface is prepared with thin film of
SiO2 nanoparticle.
 Photocatalytic surface is prepared by deposition of TiO2
nanoparticle on an adhesive surface.
Preparation of self cleaning surface

9.  Maintain the efficiency of solar cell
 Ultra dry surface application
 Reduction of corrosion
Application

10.  Eun Ji Parka, Hye Soo Yoona,Dae Han Kima, Yong Ho
Kima,Young Dok Kima, Preparation of self-cleaning
surfaces with a dual functionality of superhydrophobicity
and photocatalytic activity,j. Applied Surface Science 319
(2014) 367–371 .
 http://www.sciencedirect.com/science/article/pii/S0926337
314006158
Reference

11. THANKYOU