Preparation of stable, transparent superhydrophobic film via one step one pot sol-gel method
Herein, we report a single step and a one pot by using spin coating method for the preparation of optically transparent superhydrophobic TEOS-silica composite films. Silica sols were prepared by keeping the molar ratio of TEOS/CH3OH/H2O (0.1 M NH4F) constant at 1:33.15:6.06, respectively. Increasing the silica content of the coating solution resulted in decreasing the transparency of the composite films from 93 to 84% (in references to 93% transmission defined by a plain glass substrate). The static water and hexadecane contact angle of transparent surfaces were found to vary between 65° and 170° (sliding angle < 3°) and 45° to 5° (sliding angle = 15°) depending on the silica content. The stability of the surface remained nearly constant for several months under stored at ambient conditions. The mechanical stability of the prepared of TEOS-silica composite was tested by scratching and adhesive tape test. For the chemical test applications, NaOH, HCl, and H2SO4 were used for the TEOS-silica composite films.
KeywordsTransparent Thin films Superhydrophobic TEOS Silica
The authors gratefully acknowledge the financial support from The Scientific and Technological Research Council of Turkey (TUBITAK) under the project “Fabrication of self cleaning oil repellent glass and ceramic surfaces” (Project No. MAG-114M475). The authors would like to thank Central Laboratory of Canakkale Onsekiz Mart University for providing SEM, AFM, and FTIR.
Compliance with ethical standards
This work complies with the ethical standards.
Conflict of interest
The authors declare that they have no conflict of interest.
- 1.Erbil HY (2006) Surface chemistry of solid and liquid interfaces. Blackwell Publishing, OxfordGoogle Scholar
- 49.Paints and Varnishes: Determination of Film Hardness by Pencil Test, ISO (1998)Google Scholar
- 51.Beganskiene A, Sırutkaitis V, Kurtinaitiene M, Juskenas R, Kareiva A (2004) FTIR, TEM and NMR Iinvestigations of Stöber silica nanoparticles. Materials Science (Medziagotyra) 10:287–290Google Scholar