Loading...

Produce of Nano composite Antibacterial Coating of PDMS+TiO2+ Ag3PO4 on 316SS Using Sol-Gel Methods and its Properties

Ghamari, Niloufar | 2023

73 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56171 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Afshar, Abdullah
  7. Abstract:
  8. The aim of this research is to create coatings with antibacterial and superhydrophobic properties. To evaluate this, the sourness angle test, bacterial culture and halo diameter test have been used. The results show that 316L stainless steel containing PDMS+TiO2+7%Ag3PO4 coating, which is applied by immersion method on the substrate, has a water contact angle of 152 degrees, the number of bacteria cfu.cm2 is 44000 and the halo diameter is 24 mm. which has the best performance among other examples. In order to increase the adhesion of coatings on 316L stainless steel, first heat treatment was performed and then the samples were placed in H2SO4:H2O2 solution for 1 hour to form its OH- groups and increase surface roughness. Also, increasing the percentage of silver phosphate nanoparticles to 7% by weight can increase the surface roughness and decrease the surface energy of the coating, so that Ra=28.8 nm and Rq=292.4 nm, which is one of the important factors for the non-growth of bacteria on the surface of the coating. Applying an intermediate layer of polydimethylsiloxane can increase the corrosion resistance and scratch resistance of the samples. So that the scratch coefficient and the friction coefficient were 0.07 and 0.25  for the sample containing polydimethylsiloxane interface coating, respectively. It should be noted that according to the polarization curves, by applying PDMS+TiO2+7%Ag3PO4 coating on 316L stainless steel, the corrosion current can be increased from 1.0001E-08A/cm2 for uncoated steel to 4.3656E-10A/cm2. For coated steel, it decreased, which indicated good corrosion resistance of applied coatings. The final thickness of the coatings applied on 316L stainless steel was 2.52 microns
  9. Keywords:
  10. Nano-Composite Coating ; 316 Austenitic Stainless Steel ; Titanium Dioxide ; Antibacterial Properties ; Superhydrophobic Coating ; Polydimethylsiloxane

 Digital Object List

 Bookmark

No TOC