Super-hydrophobic coatings based on non-solvent induced phase separation during electro-spraying

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jiefeng Gao
  • Xuewu Huang
  • Ling Wang
  • Nan Zheng
  • Huaiguo Xue
  • Yiu-Wing Mai

Detail(s)

Original languageEnglish
Pages (from-to)603-612
Journal / PublicationJournal of Colloid and Interface Science
Volume506
Online published25 Jul 2017
Publication statusPublished - 15 Nov 2017

Abstract

Hypothesis The polymer solution concentration determines whether electrospinning or electro-spraying occurs, while the addition of the non-solvent into the polymer solution strongly influences the surface morphology of the obtained products. Both smooth and porous surfaces of the electro-sprayed microspheres can be harvested by choosing different non-solvent and its amount as well as incorporating polymeric additives. Experiments The influences of the solution concentration, weight ratio between the non-solvent and the copolymer, and the polymeric additives on the surface morphology and the wettability of the electro-sprayed products were systematically studied. Findings Surface pores and/or asperities on the microsphere surface were mainly caused by the non-solvent induced phase separation (NIPS) and subsequent evaporation of the non-solvent during electro-spraying. With increasing polymer solution concentration, the microsphere was gradually changed to the bead-on-string geometry and finally to a nanofiber form, leading to a sustained decrease of the contact angle (CA). It was found that the substrate coatings derived from the microspheres possessing hierarchical surface pores or dense asperities had high surface roughness and super-hydrophobicity with CAs larger than 150° while sliding angles smaller than 10°; but coatings composed of microspheres with smooth surfaces gave relatively low CAs.

Research Area(s)

  • Electro-spraying, Microspheres, Porous, Super-hydrophobic

Citation Format(s)

Super-hydrophobic coatings based on non-solvent induced phase separation during electro-spraying. / Gao, Jiefeng; Huang, Xuewu; Wang, Ling; Zheng, Nan; Li, Wan; Xue, Huaiguo; Li, Robert K.Y.; Mai, Yiu-Wing.

In: Journal of Colloid and Interface Science, Vol. 506, 15.11.2017, p. 603-612.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review