Origin of Nanobubble - Formation of Stable Vacancy in Electrolyte Solution

摘要

As an elementary structure of nanobubbles, vacancy, i.e., a kind of vacuum void stably exists in a liquid electrolyte solution, which is composed of an inner wall negatively charged by anion and a positively charged ionic atmosphere. As a result, a strong repulsing pressure induced by the attraction of the ionic atmosphere is balanced with the compressive action of surface tension. Coalescence of vacancies guarantees the same structure as a vacancy, so that the internal pressure of nano-bubble is kept low, almost equal to the atmospheric pressure. At the same time, the variation in the chemical potential of the homogeneous formation of nano-bubbles is calculated, and it is shown that after passing a critical state corresponding to a diameter of 2 nm, nanobubbles are stably created.