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.
|Journal||Colloids and Surfaces A: Physicochemical and Engineering Aspects|
|Publication status||Published - 2015|
|MoE publication type||A1 Journal article-refereed|
- carbon nanotube
- contact line dynamics
- Surface tension
Hokkanen, M. J., Lehto, R., Takalo, J., Salmela, J., Haavisto, S., Bykov, A., Myllylä, R., Timonen, J., & Ahlskog, M. (2015). Depletion of carbon nanotube depositions and tube realignment in the spreading of sessile drops. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 482, 624-630. https://doi.org/10.1016/j.colsurfa.2015.06.055