Morphology and N₂ Permeability of Multi-Wall Carbon Nanotube—Teflon Membranes

Authors: Smajda, Rita; Kukovecz, Aacute;kos; Hopp, Béla; Mohl, Melinda; Kónya, Zoltán; Kiricsi, Imre

Source: Journal of Nanoscience and Nanotechnology, Volume 7, Numbers 4-5, April/May 2007 , pp. 1604-1610(7)

Publisher: American Scientific Publishers

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Abstract:

We prepared buckypapers with surface densities in the 1.13-5.66 mg · cm⁻² range by filtering multi-wall carbon nanotube (MWCNT) suspensions in acetyl-acetone (acac) and dimethylformamide (DMF) through 0.45 μm nylon filters. Filtration curves were evaluated using the Carman equation. The average resistance of the filter itself was found to be R_m = 3.79 · 10¹⁰ m⁻¹ for acac and 8.49 · 10¹⁰ m⁻¹ for DMF. The specific resistance of the filter cakes decreased with increasing film surface density from 16.1 · 10¹² m · kg⁻¹ (for the 1.13 mg · cm⁻² film from DMF) to 4.38 · 10¹² m · kg⁻¹ (for the 5.66 mg · cm⁻² film from DMF). The effective diffusivity of N² at 298 K and a pressure difference of 10 mbar was also determined for all membranes and found to fall into the 1.14 · 10⁻⁹-3.74 · 10⁻⁹ m² · s⁻¹ range. Both the porosity and the tortuosity of buckypapers increased with their thickness. An approx. 5 μm thick Teflon (PTFE) coating was applied to the MWCNT membranes by pulsed laser deposition. The gas permeability of the MWCNT-PTFE membranes matches that of the uncoated nanotube films. This observation is an agreement with our SEM and AFM data on porous coating morphology.

Keywords: MULTI-WALL CARBON NANOTUBES; THICK FILMS; FILTRATION; GAS PERMEABILITY

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2007.343

Publication date: 2007-04-01

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