Abstract
The paper investigates the formation of charged equilibrium nanobubble on smooth hydrophobic water - solid interface. Expressions are given for change the Gibbs energy of the system taking into account the capillary Kelvin formula, the electrostatic energy of the double electric layer at the bubble-water boundary and the surface energy. It is shown that the dependence of the Gibbs energy on the radius of nanobubble have a minimum, which indicates the possibility of spontaneous generation of these nanostructures. The dependence of Gibbs energy on the contact angle, as well as water salinity and surface tension coefficient of water is investigated. Calculated surface charge required for the stability of nanobubble.
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