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

Hokkanen, Matti J.; Lehto, Roope; Takalo, Jouni; Salmela, Juha; Haavisto, Sanna; Bykov, Alexander; Myllylä, Risto; Timonen, J.; Ahlskog, M.

doi:10.1016/j.colsurfa.2015.06.055

Cited by 2 publications

(7 citation statements)

References 22 publications

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“…[24], though with a much smaller aspect ratio than with MWNTs. The orientation effect is also in accordance with our previous study [9]. However, the effect is much smaller than would be implied by the aspect ratio of AD-MWNTs.…”

Section: The Surface Tension Force At the Contact Linesupporting

confidence: 80%

“…We conclude that the particles detached from the surface during the immersion have been completely removed from the sample, rather than simply trans-located along its surface. Additional qualitative observations were: Firstly, in separate control experiments, it was verified that on substrates with hydrophobic surface conditions there is no apparent effect on the MWNT deposition, as is expected based on our previous work [9]. Secondly, repeating the immersion process yielded no visible further improvement of the purification effect.…”

Section: General Features Of the Purification Effectmentioning

confidence: 63%

“…Further details of the experiments, imaging and the analysis methodology can be found in the Supplementary information (Online Resource), and in our previous publication [9].…”

Section: Methodsmentioning

confidence: 99%

“…In a very recent work [9], we found that the advancing contact line of a water droplet, placed on a thin deposition of AD-MWNTs, can separate the amorphous carbon debris from a good share of the MWNTs. In this work, we present a purification procedure for AD-MWNT material that utilizes this effect on larger deposition areas.…”

Section: Introductionmentioning

confidence: 99%

“…The main shortcoming of AD-MWNT material is that it contains excessively amorphous carbon in particles of all size ranges in the nanometer and micrometer domains. Various purification procedures have been employed [9], which have included filtration and treatment in concentrated acids. All of these have problems in that the quality of the tubes degrades significantly as mechanical or chemical damage occurs.…”

Section: Introductionmentioning

confidence: 99%

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On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

et al. 2016

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Section: The Surface Tension Force At the Contact Linesupporting

confidence: 80%

Section: General Features Of the Purification Effectmentioning

confidence: 63%

“…Further details of the experiments, imaging and the analysis methodology can be found in the Supplementary information (Online Resource), and in our previous publication [9].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

et al. 2016

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Experimental studies on the detachment of multi-walled carbon nanotubes by a mobile liquid interface

Hokkanen

Lautala

Flahaut

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. A B S T R A C TRetention and detachment of colloidal particles from surfaces is often considered only in terms of spontaneous chemical dispersion when the surface is already fully submerged. Nevertheless, interfacial processes, where the particles are caught on a mobile liquid contact line by capillary effects are ubiquitous. Theoretical description of such interfacial processes exist for spherical microcolloids, while for anisotropic shapes the literature is limited. Arc-discharge synthesized multiwalled carbon nanotube (MWNT) material contains besides the very anisotropic tubes also irregular amorphous carbon particles (ACP) that both are strongly hydrophobic. As a water-air-solid contact line is swept over a deposition of MWNT material on a hydrophilic substrate, it causes selective detachment of the spherical ACPs over the one dimensional MWNTs. In this work we investigate the detachment process and the balance between the surface tension force and adhesive forces. Our results show that on hydrophilic substrates the surface tension force of the liquid interface dominates over adhesion, sweeping away most of the material. However, clean MWNTs oriented perpendicular to the contact line are able to resist detachment. On the other hand, on hydrophobic surfaces adhesive forces dominate, possibly via the hydrophobic interaction. We discuss these results with conventional models of capillarity and adhesion, including the van der Waals force and the electrostatic double layer interaction. However, a fully satisfactory analysis will require e.g. computational modelling of the problem.

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

Cited by 2 publications

References 22 publications

On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

Experimental studies on the detachment of multi-walled carbon nanotubes by a mobile liquid interface

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