Temporal evolution of wetting transitions of graphene oxide coated on roughened polyvinyl chloride surfaces

Zhixiong Song, Eric Shen Lin, Md Hemayet Uddin, Jian Wern Ong, Hassan Ali Abid, Zhiyuan Xiong, Dan Li, Oi Wah Liew, Tuck Wah Ng

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1 Citation (Scopus)

Abstract

In this work, the deposition of graphene oxide (GO) on roughened polyvinyl chloride (PVC) surfaces revealed contact angle changes from 16° to zero within 3 s when a 50 μL water drop was dispensed on them. When the water drop was dispensed 180 min after the surface was prepared, the contact angle changed from 32° to 4° after 35 s. Such time-dependent wetting transition was however not observed with GO deposited on glass nor on unroughened PVC surfaces. A mechanistic explanation for the observed temporal evolution of wetting properties was provided. Optical profilometry scans conducted provided insights on the effect of surface roughness on GO deposition characteristics after evaporation of the GO solution off the substrate surface. The substrate roughness and evaporation dependent temporal wetting transitions of graphene oxide (GO) coating found here is essential in various sensing, transporting, harvesting and actuating applications.

Original languageEnglish
Article number101650
Number of pages6
JournalMaterials Today Communications
Volume25
DOIs
Publication statusPublished - Dec 2020

Keywords

  • Contact angle
  • Evaporation
  • Graphene oxide
  • Temporal wetting
  • Time-stamp

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