Cetyltrimethylammonium bromide (CTAB) forms a coacervate gel complex with lauric acid (LA) in aqueous medium. It has a typical fibrillar network structure containing a core and a shell. Polyaniline (PANI) was synthesized in the void space of the junction of core and shell. Controlled synthesis and washing gives a variety of polymer morphologies including nanofiber, nanotube and inter-connected network structures of PANI. Again using this typical template and precise synthesis procedures the lengths of the PANI nanotube can be tuned in the micrometer scale. With conductivities in the order of 10⁻² S/cm, HCl-doped samples demonstrate promising electrical properties, making them suitable for various applications.

Keywords: coacervate, gel, sol, polyaniline, nanotube.