@article{9b5094e05c4043fcb406871c8927eacf,
title = "Aeration and dissolution behavior of oxygen nanobubbles in water",
abstract = "Hypothesis: Nanobubbles (NBs) in water elicit unique physicochemical and colloidal properties (e.g., high stability and longevity). Aeration kinetics and dissolution behavior of oxygen (O2) NBs are assumed to be bubble size dependent. Experiments: As an indicator for aeration efficiency, volumetric mass transfer coefficient (KL·a) was assessed by measuring the dissolved oxygen (DO) levels during aeration using O2 NBs with different sizes. Mass transfer coefficient (KL) was estimated by correlation analysis. Moreover, a modified Epstein-Plesset (EP) model was developed to predict the dissolution behavior by monitoring the DO and size changes during the dissolution of O2 NBs in water. Findings: A higher rate of DO increase and a higher equilibrium DO level were both observed after aeration with NBs that present higher surface areas for the mass transfer of O2 and a higher vapor pressure of O2 to drive the partitioning equilibrium. Dissolution kinetics of O2 NBs were highly dependent on the initial bubble size as indicated by the changes of bubble size and DO. Smaller NBs raised up DO faster, whereas larger NBs could lead to higher equilibrium DO levels. Moreover, the rate of DO decline and the quasi-steady DO levels both decreased when the dilution ratio increased, confirming that O2 NBs dictates the DO level in water. Finally, the dissolving NBs may either swell or shrink according to the model prediction.",
keywords = "Aeration, Bubble size, Dissolution, Epstein-Plesset theory, Mass transfer, Nanobubbles",
author = "Shan Xue and Yihan Zhang and Taha Marhaba and Wen Zhang",
note = "Funding Information: This research is partially supported by the national science foundation (NSF, award number: 1912367), the United States Department of Agriculture (USDA), the National Institute of Food and Agriculture, AFRI project [2018-07549] and the United States Environmental Protection Agency (US EPA) under Assistance Agreement [No. 83945101] and [No. 84001901] (EPA P3 phase I and II). The USDA and the EPA have not formally reviewed this study. The views expressed in this document are solely those of authors and do not necessarily reflect those of the agencies. The USDA and EPA do not endorse any products or commercial services mentioned in this publication. Part of this research benefited from the Center for Functional Nanomaterials Resources, a U.S. Department of Energy (DOE) Office operated for the DOE Office of Science by Brookhaven National Laboratory, Proposal No. 308241. The authors are grateful to Karen Ballen from the Center for Functional Nanomaterials of Brookhaven National Laboratory for performing NTA analyses. Funding Information: This research is partially supported by the national science foundation (NSF, award number: 1912367), the United States Department of Agriculture (USDA), the National Institute of Food and Agriculture, AFRI project [2018-07549] and the United States Environmental Protection Agency ( US EPA ) under Assistance Agreement [No. 83945101 ] and [No. 84001901 ] ( EPA P3 phase I and II). The USDA and the EPA have not formally reviewed this study. The views expressed in this document are solely those of authors and do not necessarily reflect those of the agencies. The USDA and EPA do not endorse any products or commercial services mentioned in this publication. Part of this research benefited from the Center for Functional Nanomaterials Resources, a U.S. Department of Energy (DOE) Office operated for the DOE Office of Science by Brookhaven National Laboratory, Proposal No. 308241 . The authors are grateful to Karen Ballen from the Center for Functional Nanomaterials of Brookhaven National Laboratory for performing NTA analyses. Publisher Copyright: {\textcopyright} 2021 Elsevier Inc.",
year = "2022",
month = mar,
doi = "10.1016/j.jcis.2021.11.061",
language = "English (US)",
volume = "609",
pages = "584--591",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
}