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Direct spinning of carbon nanotube fiber 2026-10-20
Continuous withdrawal and consolidation of a connected carbon nanotube aerogel from a synthesis reactor. It differs from later spinning of a prepared liquid dispersion and from drawing a pre-grown substrate-supported forest.[ref]
Direct Spinning of Carbon Nanotube Fibers from Chemical Vapor Deposition Synthesis by Ya-Li Li and others. 2004, furnace synthesis and continuous withdrawal
Use floating-catalyst chemical vapor deposition to form a continuous suspended network. Introduce a carbon feed together with a volatile catalyst precursor into a hot gas-flow reactor. Catalyst nanoparticles nucleate in the gas stream; tubes grow while moving through the reaction zone and assemble into an interconnected aerogel.
Withdraw that network continuously, collect it on a rotating spindle, and consolidate or twist it into a fiber. Long tubes, suitable number density and adequate overlap allow the network to transmit the drawing force without breaking into isolated clumps. The take-up rate must be matched to network production; collection is not simply a geometrically scaled version of a substrate carpet.
The catalyst and tubes form in the flowing gas, and the product is drawn directly from a growing aerogel. This differs both from a supported carpet and from later spinning of a separately prepared nanotube dispersion. The original demonstration combined CVD synthesis with continuous product withdrawal from the furnace.[ref]
Direct Spinning of Carbon Nanotube Fibers from Chemical Vapor Deposition Synthesis by Ya-Li Li and others. Science304, pp.276–278, synthesis-zone spinning and rotating collection