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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 55990 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Mousavi, Ali; Nouri Borujerdi, Ali
- Abstract:
- Wettability is the cause of many interactions today and is definitely effective in almost all processes where liquid and solid phases are in contact. Wetting controls by surface engineering can accelerate the process in the industry or improve the quality of daily life. Therefore, the fabrication of complex surfaces with a specific purpose and different wettability has attracted the attention of researchers. In this thesis, silica nanoparticles were synthesized to create roughness and reduce contact between surfaces and liquids at first. Then, using chemical compounds to reduce the surface energy, a transparent (94.20%) superhydrophobic and oleophobic coating was created on the glass. The slide coated with anti-reflective properties transmits an average of 3.90% light in the visible spectrum more than normal glass. In the next step, silica nanochains were synthesized with the aim of creating a three-dimensional and hierarchical porous structure on the surface and became superamphiphobic in acidic environment. Then, by using polyurethane resin, the adhesion of the new superamphiphobic coating on the aluminum surface was improved. The final coating with a contact angle of 167.06o and 143.08o respectively with water and oil droplets shows high adhesion (critical tensile strength 11.37 MPa) and good stability in acidic and alkaline environments. At the end, using fluoropolymer resin (FEVE) and silica micro/nanoparticles, an anti-fingerprint coating was created on stainless steel. Also, the mentioned coating showed high mechanical resistance against wear. In order to evaluate the wettability, the contact angle measurement test was used and the imaging of the geometric structure of the surface was done with the by scanning electron microscope (SEM). Fourier transform infrared spectroscopy (FTIR) was used to prove the superamphiphobisity of nanoparticles. The adhesion of the coating was measured by the pull-off test and the mechanical resistance was measured by the abrasion test
- Keywords:
- Contact Angle ; Superhydrophobic Coating ; Superoleophobic Coating ; Wettability ; Anti-Fingerprint
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