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The Effect of Surfactant Agents on the Superhydrophobic Properties of Silica Coatings Synthesis by Sol-gel

Ziaee, Hamed | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48281 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. The purpose of this research is producing one phase silica superhydrophobic coating by sol-gel method and drying temperature less than 200 degrees. For preparing micrometer and nanometer scaled hierarchical structure based on silica, TEOS precursor and Fumed Silica nanoparticles were used by density of 43/30 cc/lit and 6/52 gr/lit in order to provide desired roughness in the range of 40 nm. Moreover, HMDS surface modifying agent was used for reducing the surface energy of coating, which is not a danger to the environment in comparison to the same substances. The best Contact Angle is 155 degree and the best Sliding Angle is less than 5 degree. For instance, it was created with the proportion of 78/9 cc/lit for HMDS substance by using sol-gel method with HCI catalyst in the acidic environment that reduces the synthesis time of particles in to two hours. MPTS substance with low density was used in order to prevent the detachment of coating and increase its adhesion, which cause an increase in pencil test hardness from H to B. Construction of sol in the range of 7 c° temperature will increase the stability of sol and prevent its settling for several months. Morphology and structure was investigated by FESEM electronic microscope and the desirable rough structure for trapping the air between the particles was examined. The chemical combination of the particles in sol was investigated by FT-IR method which revealed the desirable bonds for creating superhydrophobic property (methyl group). The coating’s topography, particle size and surface roughness were investigated by AFM microscope. Moreover, the Contact Angle and the Sliding Angle were obtained by digital protractor. In this research, the best cotact angle measured is 161 c°
  9. Keywords:
  10. Surfactants ; Silica ; Hexamethyldisilazane ; Sol-Gel Method ; Superhydrophobic Surfaces

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