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

Hokkanen, Matti J.; Lautala, Saara; Shao, Dongkai; Turpeinen, Tuomas; Koivistoinen, Juha; Ahlskog, M.

doi:10.1007/s00339-016-0154-0

Cited by 9 publications

(15 citation statements)

References 32 publications

(39 reference statements)

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“…As we have reported previously [13], on hydrophobic surfaces the mobile water interface has no effect on the MWNT deposition.…”

Section: Resultssupporting

confidence: 51%

“…In the previous work [13], the Si chip with the MWNT deposit was slowly immersed in a test tube with water, which is now replaced with a flow chamber, illustrated in Fig. 2(a).…”

Section: Methodsmentioning

confidence: 99%

“…The CNT samples were spin coated from dispersion in 1,2-dichloroethane on thermally oxidized silicon substrates ("Si chip"), which were carefully pre-cleaned and treated with oxygen plasma to make them hydrophilic. The Si chips can also be made hydrophobic [13].…”

Section: Methodsmentioning

confidence: 99%

“…1, was found to be selective between the MWNTs and the debris particles, tending to leave the former on the surface. This selectivity has been applied for on-chip purification of arc-discharge MWNT material [13], which is demonstrated in the inset of Fig. 1, that shows on a MWNT deposition an optical image of the boundary between purified and untreated regions.…”

Section: Introductionmentioning

confidence: 99%

“…We use an experimental procedure, improved over our previous work [13], with a flow chamber ( Fig. 2(a)) that enables us to modify the chemical composition of the immersion liquid in terms of acidity and ionic strength, and thus to vary the effective particle adhesion.…”

Section: Introductionmentioning

confidence: 99%

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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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“…As we have reported previously [13], on hydrophobic surfaces the mobile water interface has no effect on the MWNT deposition.…”

Section: Resultssupporting

confidence: 51%

“…In the previous work [13], the Si chip with the MWNT deposit was slowly immersed in a test tube with water, which is now replaced with a flow chamber, illustrated in Fig. 2(a).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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