Tuning Surface Wettability and Adhesivity of a Nitrogen-Doped Graphene Foam after Water Vapor Treatment for Efficient Oil Removal

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  • Peng Zhai
  • Huimin Jia
  • Zeyang Zheng
  • Chih-Chi Lee
  • Haijun Su
  • Tzu-Chien Wei


Original languageEnglish
Article number1500243
Journal / PublicationAdvanced Materials Interfaces
Issue number14
Publication statusPublished - 1 Sept 2015
Externally publishedYes


An environment-friendly water vapor treatment for realizing a highly hydrophobic (contact angle ≈147.5) and oleophilic N-doped graphene foam (NGF) for efficiently removing oil from oil/water emulsions is presented. 3D porous networks of NGF with high N content are prepared by subjecting a mixture of graphene oxide and 5 vol% pyrrole to a hydrothermal process; the mixture is then freeze-dried and annealed under a N2 atmosphere. The surface wettability and adhesivity are tuned through water vapor treatment by forming a low-surface-energy hydrocarbon layer, with no chemical modification. The effectiveness of the hydrophobic/oleophilic NGF in removing oil from an oil/water emulsion is demonstrated.

Research Area(s)

  • adhesivity, nitrogen-doped graphene foams, oil/water emulsion, tunable surface wettability, water vapor treatment

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