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Unraveling the mystery of ultrafine bubbles: Establishment of thermodynamic equilibrium for sub-micron bubbles and its implications

Cited 10 time in Web of Science Cited 10 time in Scopus

Kim, Euna; Choe, Jong Kwon; Kim, Byung Hyo; Kim, Joodeok; Park, Jungwon; Choi, Yongju

Issue Date
Academic Press
Journal of Colloid and Interface Science, Vol.570, pp.173-181
Hypothesis: We test the validity of the Young-Laplace equation and Henry's law for sub-micron bubble suspensions, which has long been a questionable issue. Application of the two theories allows characterization of bubble diameter and gas molecule partitioning between gaseous and dissolved phases using two easily measurable variables: total gas content (C-T) and bubble volume concentration (BVC). Experiments: We measure C-T and BVC for sub-micron bubble suspensions generated from three pure gases, which allows calculation of bubble diameter for each suspension using the Young-Laplace equation and Henry's law. Uncertainties involved in the experimental measurements are assessed. Bubble size for each suspension is also directly measured using a dynamic light scattering (DLS) technique for comparison. Findings: Applying the two theories we calculate that the bubble diameters are in the range of 304518 nm, which correspond very well with the DLS-measured diameters. Sensitivity analyses demonstrate that the correspondence of the calculated and DLS-measured bubble diameters should take place only if the two theories are valid. The gas molecule partitioning analysis shows that >96% of gas molecules in the suspension exist as dissolved phase, which suggests the significance of the dissolved phase for applications of the bubble suspensions. (C) 2020 Elsevier Inc. All rights reserved.
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