Enlarged version of the droplet power source, for visualisation. In the study, the activated droplet power source produced a current which persisted for over 30 minutes. The activation process for the hydrogel droplet power unit. Right: The power source is activated by a thermal gelation process to rupture the lipid bilayers. The study ‘A Microscale Soft Ionic Power Source Modulates Neuronal Network Activity’ has been published in Nature.