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

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Experimental studies on the detachment of multi-walled carbon nanotubes by a mobile liquid interface. / Hokkanen, M. J.; Lautala, S.; Flahaut, E.; Ahlskog, M.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 533, 20.11.2017, p. 109-115.

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@article{0d5e1cf46a904c268bf0e3a26ad03376,
title = "Experimental studies on the detachment of multi-walled carbon nanotubes by a mobile liquid interface",
abstract = "Retention 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.",
keywords = "Carbon nanotube, Contact line, Surface tension, Wetting, Surface chemistry, Hydrophobic interaction, AIR-WATER INTERFACES, SILICA SURFACES, GRAPHENE, COLLOIDS, REMOVAL, RELEASE",
author = "Hokkanen, {M. J.} and S. Lautala and E. Flahaut and M. Ahlskog",
year = "2017",
month = "11",
day = "20",
doi = "10.1016/j.colsurfa.2017.08.029",
language = "English",
volume = "533",
pages = "109--115",
journal = "Colloids and Surfaces A: Physicochemical and Engineering Aspects",
issn = "0927-7757",

}

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TY - JOUR

T1 - Experimental studies on the detachment of multi-walled carbon nanotubes by a mobile liquid interface

AU - Hokkanen, M. J.

AU - Lautala, S.

AU - Flahaut, E.

AU - Ahlskog, M.

PY - 2017/11/20

Y1 - 2017/11/20

N2 - Retention 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.

AB - Retention 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.

KW - Carbon nanotube

KW - Contact line

KW - Surface tension

KW - Wetting

KW - Surface chemistry

KW - Hydrophobic interaction

KW - AIR-WATER INTERFACES

KW - SILICA SURFACES

KW - GRAPHENE

KW - COLLOIDS

KW - REMOVAL

KW - RELEASE

U2 - 10.1016/j.colsurfa.2017.08.029

DO - 10.1016/j.colsurfa.2017.08.029

M3 - Article

VL - 533

SP - 109

EP - 115

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

SN - 0927-7757

ER -

ID: 27713784