The production of 100/400 nm inner/outer diameter carbon tubes by solution blowing and carbonization of core–shell nanofibers

Core–shell drops of Polymethyl Methacrylate (PMMA) and Polyacrylonitrile (PAN) are subjected to a high speed gas jet that results in their stretching and bending. As a result of this enormous elongation, after solvent evaporates, core–shell polymer nanofiber mats are deposited on a screen. Heat treatment allows complete elimination of the core and carbonization of the shell, which yields carbon tubes with an inner diameter 50–150 nm and outer diameter 400–600 nm, and their mats.