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A surprising phenomenon is presented: a bubble, produced from waterelectrolysis, is immobilized in the liquid (as if the Archimedes' buoyant forcewere annihilated). This is achieved using a nanoelectrode (1 nm to 1 $\mu$m ofcurvature radius at the apex) and an alternating electric potential withadapted values of amplitude and frequency. A simple model based on"nanoelectrolysis" (i.e., nanolocalization of the production of H2 and O2molecules at the apex of the nanoelectrode) and an "open bubble" (i.e.,exchanging H2 and O2 molecules with the solution) explains most of theobservations.

Immobilization of a bubble in water by nanoelectrolysis