Tailoring intrinsic hydrophobicity and surface energy on rough surface via low-T Cassie–Wenzel wetting transition method

Fei Huang, Behrooz Motealleh, Donghui Wang, Chris J. Cornelius

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Wettability is an important parameter of micro/nanostructured composites. The measurement of apparent contact angle is strongly affected by surface roughness, which induces some challenges to study the intrinsic hydrophobicity correlating to the nature of chemistry. Carbon-Nafion composites exhibited about 30° decrease in apparent contact angle from 30 to 10°C due to the condensation of water vapor into cavities, suggesting a significant Cassie–Wenzel wetting transition phenomenon. The focus of this work has been on the first-time use of a low-T Cassie–Wenzel wetting transition method to evaluate Young's (ideal) contact angle and surface free energy. A maximum Young's contact angle (113°) and minimum total surface energy (12 mJ/m2) were determined at Nafion content of 70 wt%, indicating the orientation effect that sulfonate groups in Nafion preferentially pointed toward polar carbon. This approach provided the reasonable prediction of intrinsic hydrophobicity, especially when a rough solid surface is not easily wetted by liquids.

Original languageEnglish (US)
Article numbere17908
JournalAIChE Journal
Volume69
Issue number3
DOIs
StatePublished - Mar 2023
Externally publishedYes

Keywords

  • Cassie–Wenzel wetting transition
  • intrinsic hydrophobicity
  • surface free energy
  • surface roughness
  • theoretical models

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • General Chemical Engineering

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