Dissertation
Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Purification and Application of Coal-Based Single-Walled Carbon Nanotubes

Author DongQiang
Tutor QiuJieShan
School Dalian University of Technology
Course Membrane Science and Technology
Keywords Single - walled carbon nanotubes Purification Carbon nanotube / carbon composite film Mushroom -shaped micron carbon materials
CLC TB383.1
Type Master's thesis
Year 2010
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So far, coal as the raw material preparation of single-walled carbon nanotubes (SWCNTs) has become a reality, but the resulting product is mixed with a large number of amorphous carbon, carbon nano-particles, carbon shell of the coated metal catalyst particles, fullerenes, and The metal catalyst particles and other impurities, the presence of these impurities to a great extent, hindered its practical application, so it is necessary to purification of the crude product of the SWCNTs. This study using ultrasound treatment - oxidation combining Chinese TAIXI anthracite coal as a carbon source by arc discharge method of coal-based SWCNTs purified to obtain a purity of about 90wt.% SWCNTs, simultaneously, ultrasonic treatment during the purification plays an important role in the process: to impurities shedding from the surface of carbon nanotubes and impurities larger particles are broken into smaller particles by sonication make subsequent chemical oxidation treatment are better able to play a role. Carbon nanotube has good mechanical properties, special electrical properties, good heat transfer performance and higher thermal conductivity, it is these excellent properties makes the carbon nanotubes is considered ideal polymer composites reinforced material; while the light gases in the transfer rate of the carbon nanotubes is very fast, by several orders of magnitude faster than the rate in the same aperture of the zeolite or other microporous material, and therefore expected to be one-dimensional pores of the carbon nanotubes as the carbon nanotube film hole The film will have a very high gas flux. This article the carbon nanotubes is introduced into a polymer precursor (PAA), and then the function of the carbon nanotube / carbon composite membrane prepared in the carbonization process, results show that the doping of the SWCNTs can effectively improve the selectivity of the membrane, while the doping of MWCNTs greatly increased the permeability of the membrane; Meanwhile, we also found that the introduction of carbon nanotubes significantly improve the carbon film conductive properties, is expected to make a carbon film electrode material proton exchange film field applications. Micro and nano carbon materials because of its scale and diversity of morphology, it has unique optical, electrical, magnetic, and mechanical properties, in the field of functional materials show a wide range of application prospects, so by different physical and chemical changes The ideal form of micro-nano-carbon materials prepared by the current research. This paper reports the China Taixi anthracite as a carbon source, FeS as catalyst, to 0.045 MPa H2 and He (volume ratio 1:2) mixed atmosphere by DC arc discharge method had the mushroom-shaped micron carbon materials.

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