Fabrication of transparent superhydrophobic surface by supercritical CO2 medium


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Cengiz U.

V. International Istanbul Scientific Research Congress, İstanbul, Turkey, 14 - 15 August 2021, pp.200

  • Publication Type: Conference Paper / Summary Text
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.200

Abstract

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

 

ABSTRACT

 

 

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