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Buckypaper (BP) is a planar film that consists of random network of multiwall carbon nanotubes (MWCNTs) held together by weak van der Waals interactions at tube-tube junctions. Although individual carbon nanotubes (CNTs) possess remarkable electrical properties, the electrical resistance of pristine BP is usually too high for practical applications. However, the electrical resistivity of BP can be...
The heat transfer coefficient between a single water droplet and a multiwall carbon nanotube film (buckypaper) was measured for pristine and for carboxy functionalized nanotubes by infrared thermography. The value for non-functionalized nanotubes (438 Wm−2 K−1) was more than twice as large as that for functionalized ones (204 Wm−2 K−1) even though the water to nanotube affinity is larger in the latter...
Bulk aligned multi-walled carbon nanotube films and their epoxy composites were prepared and their DC and AC conductivity studied. Nanotube films of up to 2mm thickness were grown by catalytic chemical vapor deposition. Composites of nanotubes were made by infiltrating the films with a commercial epoxy. DC electrical resistivities in the axial direction of as-grown and purified films were found to...
This study explores the possibility of converting a self-supporting, randomly aligned, low impedance multi-wall carbon nanotube (MWCNT) paper into a resistive temperature measurement unit working at ambient pressure in air in the 25–70°C range. Thermosensitization was achieved by decorating the surface of the films with pyroelectric CsNO 3 or LiNbO 3 crystals. Assuming a linear temperature...
We report on the filtration behavior, scanning electron microscopy (SEM) and gas permeability of multi-wall carbon mats (buckypapers). The SEM-apparent macropore diameter, image fractal dimension and lacunarity (a measure of translational invariance) of the samples averaged at 38nm, 1.82 and 0.55, respectively. Their N 2 adsorption analysis revealed an average BET specific surface area of...
A systematic study on the morphological changes experienced by multi-wall carbon nanotubes during long-time ball milling in a vibrating mill was performed. Samples were collected in the time interval 0–200h and analyzed with TEM and N 2 adsorption. The change of the mean nanotube length with time could be approximated with a second-order exponential decay function. The length distribution...
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