article_snippet: The 3D structures were made by dropping graphene oxide into hot solvent - a process that has been likened to deep-frying food.
article_snippet: These 3D spheres were formed by dropping graphene oxide into hot solvent .
article_snippet: Sang-Hoon Park and his colleagues at the Yonsei University, in Seoul put flakes of graphene oxide into an ultrasonic nozzle, which used sound waves to create microdroplets.
article_snippet: microdroplets were when sprayed into a mixture of organic solvent and ascorbic acid, at temperatures of 160°C (320°F).
article_snippet: In the solvent and acid, graphene oxide was turned into graphene, the water in the droplets evaporated, and the resulting spheres resembled pom-poms.
article_snippet: As they formed, nanosheets in graphene spilled out from the centre, creating ‘waves’ of particles.