Combined micro-/nanoscale surface roughness for enhanced hydrophobic stability in carbon nanotube arrays

Z. Wang, N. Koratkar, L. Ci, P. M. Ajayan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

89 Citations (Scopus)

Abstract

Extreme water repellency is greatly desired for anticontamination and self-cleaning applications. Aligned multiwalled carbon nanotube arrays exhibit superhydrophobic behavior but suffer from poor hydrophobic stability and contact angle hysteresis. In this work the authors selectively grow multiwalled nanotubes onto a patterned substrate and engineer a novel high aspect ratio architecture which combines a micro- and a nano-scale roughness structure. While there is no significant difference in the static contact angle of the patterned and uniform nanotube arrays, dynamic measurements indicate a dramatic increase in hydrophobic stability for the patterned array caused by entrapped air pockets which prevent Cassie to Wenzel state transition.

Original languageEnglish
Article number143117
JournalApplied Physics Letters
Volume90
Issue number14
DOIs
Publication statusPublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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