Direct synthesis of uniform hollow carbon spheres by a self-assembly template approachElectronic supplementary information (ESI) available: SEM pictures of the products from simple mixing. See http://www.rsc.org/suppdata/cc/b2/b205723a/

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Abstract
Hollow carbon spheres (50–100 nm) have been synthesized by a self-assembly approach using hexachlorobenzene and Na. NaCl which generated during the reaction has been successfully exploited as a template for the direct synthesis of porous carbon materials, which can be subsequently removed from carbon product by annealing above 1400 °C.