NanoCraft, Inc has made available a new research paper, "Ball Milling Multiwall Nanotubes to Improve Electrical Conductivity" available immediately from this website. It can be downloaded PDF format or Microsoft Doc format. The paper was presented at the 2005 Society for the Advancement of Material and Process Engineering (SAMPE) conference, May 1st - 4th.
Abstract:
Applications using nanotubes for electrical conductivity are expected to increase as material becomes available in commercial quantities at lower prices. Notably, the electrical arc process can produce low cost material and users have a choice of many aggregate sizes. Ball milling has been used to reduce the aggregates to tiny particles to improve dispersion to promote electrical conductivity. This is the first study which directly compares the electrical conductivity of ball milled multiwall nanotube materials to ground materials. DC conductivity measurements by two-probe method were determined for six aggregate sizes of multiwall nanotube materials. The samples were compressed at a pressure of 2.4 kPa, 65.9 kPa and 837 kPa in a hollow plastic cylinder using two metal plunges connected to a Flute multimeter. The conductivity of ball milled MWNT-A at room temperature was found to decrease from 10 ohm-cm when lightly pressed at 2.4 kPa to 0.3 ohm-cm at 65.9 kPa and to 0.1 ohm-cm at 837 kPa. Ball milled MWNT-A had the best conductivity of all samples at the highest pressure. Data defining the MWNT-A is presented including TEM, TGA, Raman, X-Ray diffraction and High Density.
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