Discontinuous Density Gradient Fractionation of Detonation Soot for Complete Nanocarbon Characterization

Detonation of high explosives (HE) with negative oxygen balance can expand our understanding of the reaction pathways that are occurring at extreme conditions as well as the opportunity to prepare unique carbon nanomaterials. In order to understand detonation mechanisms or isolate carbon nanomaterials, characterization of nanocarbon contained within the soot is paramount. Progress towards a non-traditional approach for detonation soot processing that eliminates the need for acid treatment to remove metal impurities is presented. Separation of detonation soot using a heavy liquid, sodium polytungstate (SPT), to fractionate the detonation soot based on density was tested. Powder x-ray diffraction analysis provided confirmation that metals could be effectively removed from the bulk. Detonation synthesis offers an avenue for the discovery of new carbon frameworks and provides insight into reactions at extreme conditions providing for more accurate predictions of HE performance, explosion intent, and simulation refinement. These results presented here are of interest to both the nanoscience and shock physics communities.