TY - JOUR
T1 - Air nanobubbles retard calcite crystal growth
AU - Tagomori, Ken
AU - Kioka, Arata
AU - Nakagawa, Masami
AU - Ueda, Akira
AU - Sato, Kenji
AU - Yonezu, Kotaro
AU - Anzai, Satoshi
N1 - Funding Information:
The authors are grateful to T. Yokoyama, A. Aikawa, K. Sasaki, Y. Sugai, N. Okibe, Y. Kiyota, T. Kodama, and S. Jalilinasrabady for discussion and their comments to our earlier study. The authors also thank the reviewers for their helpful comments. This work was supported by the Frontiers in Engineering Research from Kyushu University ( FY2020-2021 ) and JSPS KAKENHI Grant-in-Aid for Early-Career Scientists ( JP21K14576 ).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/9/5
Y1 - 2022/9/5
N2 - Demands for “green” additives that control the crystal growth and inhibit the scale formation in industrial processes are growing as never before. Nanobubbles can be the green additive for inhibiting and/or promoting the crystal growth of calcium carbonate, given their well-known unique physicochemical properties. This paper reports for the first time the changes in the crystal growth rate of calcite in liquid in the presence of air nanobubbles. We injected the air nanobubbles into the solution and studied the calcite crystal growth for the first 4 h in a static condition at 20 °C and 88 °C. We found that air nanobubbles retarded the growth rate of calcite crystal by up to 53 % and 33 % at 20 °C and 88 °C, respectively. The retardation of calcite crystal growth could differ with different number densities of air nanobubbles added to the solution. A higher number density of nanobubbles generally showed slightly greater retardation throughout the tested 4 h. Air nanobubbles may influence the crystal growth either by changing solid-liquid interfacial tension on the crystal surface, reducing the free growth sites, adsorbing Ca2+ ions, playing roles in bubble mattress and thermal buffering on the crystal surface, or combinations of them. Our findings suggest that air nanobubbles can be utilized as a green inhibitor of calcite crystal growth and calcium carbonate scale in broad industrial areas.
AB - Demands for “green” additives that control the crystal growth and inhibit the scale formation in industrial processes are growing as never before. Nanobubbles can be the green additive for inhibiting and/or promoting the crystal growth of calcium carbonate, given their well-known unique physicochemical properties. This paper reports for the first time the changes in the crystal growth rate of calcite in liquid in the presence of air nanobubbles. We injected the air nanobubbles into the solution and studied the calcite crystal growth for the first 4 h in a static condition at 20 °C and 88 °C. We found that air nanobubbles retarded the growth rate of calcite crystal by up to 53 % and 33 % at 20 °C and 88 °C, respectively. The retardation of calcite crystal growth could differ with different number densities of air nanobubbles added to the solution. A higher number density of nanobubbles generally showed slightly greater retardation throughout the tested 4 h. Air nanobubbles may influence the crystal growth either by changing solid-liquid interfacial tension on the crystal surface, reducing the free growth sites, adsorbing Ca2+ ions, playing roles in bubble mattress and thermal buffering on the crystal surface, or combinations of them. Our findings suggest that air nanobubbles can be utilized as a green inhibitor of calcite crystal growth and calcium carbonate scale in broad industrial areas.
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U2 - 10.1016/j.colsurfa.2022.129319
DO - 10.1016/j.colsurfa.2022.129319
M3 - Article
AN - SCOPUS:85131216597
SN - 0927-7757
VL - 648
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 129319
ER -
