<abstract abstract-type="toc"> <title> <x xml:space="preserve">Abstract</x> </title> <p> <graphic position="anchor" id="ga" xlink:href="ark:/27927/pgjn2nvzxg" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" />The synthesis of magnetite (Fe<sub>3</sub>O<sub>4</sub>)@C nanocapsules with Fe<sub>3</sub>O<sub>4</sub> nanoparticles as the core and onion-like carbon as the shell has been reported.</p> </abstract>