Abstract
The dependence of the volume number density of ion-stabilized gas nanobubbles (bubstons) on the type of gas and the pressure created by this gas in deionized water and saline solution has been investigated. The range of external pressures from the saturated water vapor (17 Torr) to 5 atm was studied. It turned out that the growth rate of the volume number density of bubstons is controlled by the magnitude of the molecular polarizability of dissolved gases. The highest densities of bubstons were obtained for gases whose molecules have a dipole moment. At fixed external pressure and the polarizability of gas molecules, the addition of external ions leads to a sharp increase in the content of bubstons.
Highlights
IntroductionThere has been an increased interest in nanobubbles (gas bubbles with a size of 100–200 nm) in the volume of a liquid, see review (Alheshibri et al, 2016) and the references therein
There has been an increased interest in nanobubbles in the volume of a liquid, see review (Alheshibri et al, 2016) and the references therein
It is shown in this work that, in the pressure range of 1–5 atm, the rate of specific generation of bubstons δnb/δt is determined by the volume number densities of dissolved gas molecules nsg and ions ni see Eq 2), and depends on the specificity of the interaction between gas and water molecules
Summary
There has been an increased interest in nanobubbles (gas bubbles with a size of 100–200 nm) in the volume of a liquid, see review (Alheshibri et al, 2016) and the references therein. The interest in these objects is primarily due to a wide range of their applications, mainly in medicine and adjacent areas. In (Cho et al, 2005) the authors use the term nanobubbles for bubbles with a diameter of less than 1000 nm (1 μm).
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