Research Information System
V. International Istanbul Scientific Research Congress, İstanbul, Turkey, 14 - 15 August 2021, pp.200
Fabrication of transparent
superhydrophobic surface by supercritical CO2 medium
Ugur Cengiz*
*Engineering Faculty,
Chemical Engineering Department, Canakkele, Turkey.
ORCID Code: 0000-0002-0400-3351
*ucengiz@comu.edu.tr, 0537 5745552
A superhydrophobic surface
having apparent water contact angles (CA) higher than 150° and contact angle
hysteresis (CAH) less than 10° was fabricated by applying a free meniscus coating
(FMC) method in a liquid CO2 medium. Firstly, perfluoro ethyl
methacrylate (PFMA) polymer was synthesized by a free radical polymerization in
supercritical CO2 medium at 250 bar and 80 oC. The cloud
point experiment observed visually through the view cell showed that the PFMA
polymer (5 wt %) was dissolved homogeneously above 100 bar pressures at 25 oC.
The flat and rough surface were fabricated by FMC method. Boron-containing silica
nanoparticles (BSP) that were fabricated in scCO2 medium by CO2
assisted solgel method are used to produce rough surfaces. The PFMA/BSP
dispersion were prepared homogeneously at room temperature under a low CO2
pressure. The PFMA/BSP dispersion pressure was increased up to 250 bar and then
transferred in a stainless-steel tube to coat glass slides. Transparent and
superhydrophobic coatings were formed under different coating conditions with
the variation of PFMA and BSP concentrations. The highest CA and CAH values
were found as 170° and 3°, respectively.
Keywords: Superhydrophobic, Boron, Silica, scCO2,
Transparent
This work was supported by Çanakkale
Onsekiz Mart University the Scientific Research Coordination Unit, Project
number: FBA-2021-3580