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Mineral dissolution by dimeric complexes.

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Název: Mineral dissolution by dimeric complexes.
Autoři: Li, Xiaoxu, Guo, Qing, Zhao, Yatong, Qian, Chang, Pouvreau, Maxime, Graham, Trent R., Chen, Ping, Liu, Lili, Liu, Chang, Legg, Benjamin A., Chen, Qian, Miao, Aijun, Wang, Zheming, De Yoreo, James J., Pearce, Carolyn I., Clark, Aurora E., Rosso, Kevin M., Zhang, Xin
Zdroj: Proceedings of the National Academy of Sciences of the United States of America; 10/14/2025, Vol. 122 Issue 41, p1-10, 36p
Témata: GIBBSITE, DIMERS, ALKALINE solutions, DISSOLUTION (Chemistry), ATOMIC force microscopy, CHEMICAL dissolution kinetics, LEACHING, ACTIVATION energy
Abstrakt: Mineral dissolution is typically thought to occur by the detachment of monomeric building blocks of the crystal structure, although direct evidence is rare. Using in situ high-speed atomic force microscopy to examine step-edge retreat dynamics at high resolution, we report that the dissolution of gibbsite in alkaline solutions occurs mainly by the release of aluminate dimers, which subsequently dissociate into the monomeric species that dominate the solution. The observed dissolution anisotropy is readily explained by this mechanism, which was further supported by density functional tight-binding simulations of detachment activation energies. Recognition that such polynuclear dissolution mechanisms exist may enable an improved understanding of processes regulating mineral dissolution rates in nature and industry. [ABSTRACT FROM AUTHOR]
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Databáze: Complementary Index
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Abstrakt:Mineral dissolution is typically thought to occur by the detachment of monomeric building blocks of the crystal structure, although direct evidence is rare. Using in situ high-speed atomic force microscopy to examine step-edge retreat dynamics at high resolution, we report that the dissolution of gibbsite in alkaline solutions occurs mainly by the release of aluminate dimers, which subsequently dissociate into the monomeric species that dominate the solution. The observed dissolution anisotropy is readily explained by this mechanism, which was further supported by density functional tight-binding simulations of detachment activation energies. Recognition that such polynuclear dissolution mechanisms exist may enable an improved understanding of processes regulating mineral dissolution rates in nature and industry. [ABSTRACT FROM AUTHOR]
ISSN:00278424
DOI:10.1073/pnas.2504109122