Depletion of carbon nanotube depositions and tube realignment in the spreading of sessile drops

Matti J. Hokkanen, Roope Lehto, Jouni Takalo, Juha Salmela, Sanna Haavisto, Alexander Bykov, Risto Myllylä, Jussi Timonen, Markus Ahlskog (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

We studied spreading of drops of water and dilute alcohol on multiwall carbon nanotube (MWNT) depositions. These deposits consisted of individual arc-discharge synthesized MWNTs and irregular amorphous carbon nanoparticles on hydrophilically rendered silicon substrates. The mobile circular contact line of a spreading drop created an annular shape on the deposit, where some of the MWNTs and the amorphous nanoparticles in particular were largely depleted. The effect was strongly dependent on the hydrophilicity of the substrate. Most of the MWNTs were not only left within the annuli, but were also apparently reoriented by their interaction with the passing contact line. Our results imply the possibility of applications in quality improvement of nanotube depositions in terms of both tube orientation and cleanliness.
Original languageEnglish
Pages (from-to)624-630
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume482
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Keywords

  • wetting
  • carbon nanotube
  • contact line dynamics
  • Surface tension
  • orientation
  • adhesion

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