The role of the hydrate layer in nanobubble stability

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Abstract

The factors determining the stability of a nanobubble with a hydrate layer 1 nm thick and a permittivity of about 3 are considered. Two stability hypotheses are compared: electrostatic and mechanical (ice-effect or “electrofreezing”). In the first case, the Laplace pressure is compensated by the electrostatic pressure at its boundary, and in the second – by the effect of electrofreezing of its Δ-layer in a high electric field. It is shown that in salt-free water, a smaller nanobubble charge is required for the formation of an ice shell than with the Coulomb stabilization mechanism. In seawater, on the contrary, the Coulomb mechanism is more efficient, since icing is counteracted by ions of the dissolved salt. The sizes and charge of the nanobubble are determined for two stability mechanisms.

About the authors

Y. K. Levin

Institute of Applied Mechanics RAS (IAM RAS)

Email: iam-ras@mail.ru
Leningradsky Prospekt, 7, bld. 1, Moscow, 125040 Russia

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