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Synthesis and Characterizes of Superoleophobic Coating on Stainless Steel

Amirpoor, Setareh | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49116 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. The main objective of this project was to create some coatings with different wettability properties of water and oil on the 304 stainless steel mesh In order to achieve phase separation. With the aim of creating a hydrophilic property, Various resin such as SILRES BS29, PDDA PDMS-OH, PDMS-NH2 was used individually or mixed. Furthermore, silica and TiO2 nanoparticles were used to make surface roughness. Perfluorooctanoic acid with 15 fluorine atoms in its molecular structure were added to solution to create the effect of superoleophobic. The contact angle and the slip angle measurements tests were performed. morphology and structure of nanocomposite coating study by FESEM microscopy and atomic force microscopy was performed. It was observed that increasing the concentration of silica nanoparticles leads to more thorough coverage and increases the surface roughness and surface superoleophobic property. Different concentrations 2-3-8-10 gr/lit were evaluated and ultimately the amount of 10gr/lit was chosen as the optimal concentration. Solution were prepared by hydrophilic resin at concentrations ranging from 1 to 4 gr/lit. It was observed that in order to achieve superoleophobicity and hydrophilic properties at the same time, concentration of 1 gr/lit should be chosen. To find the optimal value of the superoleophobicity component, different values of this component in the range of 300-900cc/lit was added to the solution and it was observed the optimal amount needed to react with hydrophilic polymer is 200 cc/lit. The final solution was coated on different substrates by various methods such as brush, sponge, immersion and ultrasonic. It was observed that different methods show a similar answer of oil contact angle. By changing the time of immersion, the contact angle did not change, but adhesion and coating thickness increased with increasing immersion time. the optimal Immersion time was considered 5 minutes. The octyl amine was used as a surfactant in order to increase stability of the solution and uniformity of the coating. In the same way to increase adhesion of the coating, the Dibutyltin dilaurate was added as hardener Which resulted in improve the coating adhesion according pencil test pencil from 6B to H. Heat treatment at a temperature of 180 ℃ led to increase coating adhesion until 3H according pencil test. After achieving a coating that had a different wettability to water and oil, an oil and water separation system was designed witch achieved to High separation efficiency of 96%
  9. Keywords:
  10. Stainless Steel Mesh ; Superhydrophobic Surfaces ; Silica Nanoparticles ; Oil and Water Separation ; Superoleophobic Coating

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