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Li X, Pedrosa ET, Wang Q, Qian B, Shen X, Lu D, Luttge A. Discontinuous Dissolution Mechanism of Olivine Deduced from a Topography Observation Method. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:19008-19015. [PMID: 38079624 DOI: 10.1021/acs.langmuir.3c03142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
Olivine dissolution plays an important role in environmental science and technology, from controlling global element circulation to carbon capture for climate change mitigation. Most studies have been focused on investigating its dissolution rates by monitoring chemical effluent changes under various conditions. However, only by observation of surface reactivity can we unravel the actual mechanism (s) of dissolution. Here, we studied the dissolution of an olivine (010) plane in a flow-through reaction cell with an acidic solution, a surface-controlled regime, and far-from-equilibrium conditions. Direct mineral surface topography measurements using vertical scanning interferometry and atomic force microscopy allowed for quantitative analyses of the spatial and temporal changes in the dissolution rate. The (010) plane dissolved discontinuously in time for different surface sites, resulting in a heterogeneously distributed rate map. Pits with different depths showed opposite dissolution rate distributions from the dislocation center to further out from the etch pit. Based on the step-wave model, we propose a mechanism of dissolution that is governed by the competition between Gibbs free energy of the dissolution process, ΔG, and the critical free energy of the opening of etch pits, i.e., ΔGcrit. The migration of step waves, the distribution of surface defects, the strain field of etch pits, and other dynamic elements, resulting in the instantaneous change of ΔGcrit on the surface, are important factors leading to the discontinuous dissolution of crystal materials. This discontinuous dissolution provides new insight into the guidance of crystalline mineral applications and the prediction of material properties regarding mineral dissolution variation.
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Affiliation(s)
- Xiaodong Li
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Elisabete T Pedrosa
- MARUM & Fachbereich Geowissenschaften, Universität Bremen, 28359 Bremen, Germany
| | - Qianqian Wang
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Binbin Qian
- School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng 224002, China
| | - Xiaodong Shen
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Duyou Lu
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Andreas Luttge
- MARUM & Fachbereich Geowissenschaften, Universität Bremen, 28359 Bremen, Germany
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Song S, Wang L, Xie G, Qu Y, Li H, Wang H, Han P, Tao X. Different Dissolution Molecular Pathways of Azilsartan Crystals with Different Forms Revealed by In Situ Atomic Force Microscopy. J Phys Chem Lett 2023; 14:8191-8198. [PMID: 37671935 DOI: 10.1021/acs.jpclett.3c02111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
Here, using in situ atomic force microscopy (AFM), the dissolution behaviors and dissolution molecular pathways of two azilsartan crystals, the isopropanol solvate (AZ-IPA), and form I (AZ-I), in pure water and 6-30% poly(ethylene glycol) (PEG) aqueous solutions are revealed. The dissolution behaviors of step retreat and etch pit formation are observed on the (100) faces of the two crystals, with a single step corresponding to one molecular monolayer in crystal structures. Etching rates of pits increase with PEG concentration. Furthermore, our results show that AZ-IPA dissolves by the direct detachment of molecules from the step front to solution. Such a mechanism remains even when the PEG concentration changes. However, AZ-I dissolves primarily by the surface diffusion mechanism involving molecular detachment from the step front at first and then diffusion over the terraces before desorption into solution. PEG promotes the dissolution of AZ-I crystals by favoring the molecular detachment from the step front.
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Affiliation(s)
- Shuhong Song
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Lei Wang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Guanying Xie
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Yaqian Qu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Huimin Li
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Hongshuai Wang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Peizhuo Han
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Xutang Tao
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
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First Steps towards Understanding the Non-Linear Impact of Mg on Calcite Solubility: A Molecular Dynamics Study. MINERALS 2021. [DOI: 10.3390/min11040407] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Magnesium (Mg2+) is one of the most common impurities in calcite and is known to have a non-linear impact on the solubility of magnesian calcites. Using molecular dynamics (MD), we observed that Mg2+ impacts overall surface energies, local free energy profiles, interfacial water density, structure and dynamics and, at higher concentrations, it also causes crystal surface deformation. Low Mg concentrations did not alter the overall crystal structure, but stabilised Ca2+ locally and tended to increase the etch pit nucleation energy. As a result, Ca-extraction energies over a wide range of 39 kJ/mol were observed. Calcite surfaces with an island were less stable compared to flat surfaces, and the incorporation of Mg2+ destabilised the island surface further, increasing the surface energy and the calcium extraction energies. In general, Ca2+ is less stable in islands of high Mg2+ concentrations. The local variation in free energies depends on the amount and distance to nearest Mg in addition to local disruption of interfacial water and the flexibility of surface carbonate ions to rotate. The result is a complex interplay of these characteristics that cause variability in local dissolution energies. Taken together, these results illustrate molecular scale processes behind the non-linear impact of Mg2+ concentration on the solubility of magnesium-bearing calcites.
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Uchimiya M, Bannon D, Nakanishi H, McBride MB, Williams MA, Yoshihara T. Chemical Speciation, Plant Uptake, and Toxicity of Heavy Metals in Agricultural Soils. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:12856-12869. [PMID: 32155055 DOI: 10.1021/acs.jafc.0c00183] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Heavy metals in agricultural soils exist in diverse dissolved (free cations and complexed species of positive, neutral, or negative charges), particulate (sorbed, structural, and coprecipitated), and colloidal (micro- and nanometer-sized particles) species. The fate of different heavy metal species is controlled by the master variables: pH (solubility), ionic strength (activity and charge-shielding), and dissolved organic carbon (complexation). In the rhizosphere, chemical speciation controls toxicokinetics (uptake and transport of metals by plants) while toxicodynamics (interaction between the plant and absorbed species) drives the toxicity outcome. Based on the critical review, the authors recommend omics and data mining techniques to link discrete knowledge bases from the speciation dynamics, soil microbiome, and plant transporter/gene expression relevant to homeostasis conditions of modern agriculture. Such efforts could offer a disruptive application tool to improve and sustain plant tolerance, food safety, and environmental quality.
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Affiliation(s)
- Minori Uchimiya
- USDA-ARS Southern Regional Research Center, 1100 Robert E. Lee Boulevard, New Orleans, Louisiana 70124, United States
| | - Desmond Bannon
- Toxicology Directorate, Army Public Health Center, 8988 Willoughby Road, Aberdeen Proving Ground, Maryland 21010, United States
| | - Hiromi Nakanishi
- Department of Global Agricultural Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Murray B McBride
- Soil and Crop Sciences, Cornell University, 910 Bradfield Hall, 115 Coastal Way, Ithaca, New York 14853, United States
| | - Marc A Williams
- Toxicology Directorate, Army Public Health Center, 8988 Willoughby Road, Aberdeen Proving Ground, Maryland 21010, United States
| | - Toshihiro Yoshihara
- Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan
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Crystal Dissolution Kinetics Studied by a Combination of Monte Carlo and Voronoi Methods. MINERALS 2018. [DOI: 10.3390/min8040133] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Abstract
Fluid-solid reactions result in material flux from or to the solid surface. The prediction of the flux, its variations, and changes with time are of interest to a wide array of disciplines, ranging from the material and earth sciences to pharmaceutical sciences. Reaction rate maps that are derived from sequences of topography maps illustrate the spatial distribution of reaction rates across the crystal surface. Here, we present highly spatially resolved rate maps that reveal the existence of rhythmic pulses of the material flux from the crystal surface. This observation leads to a change in our understanding of the way crystalline matter dissolves. Rhythmic fluctuations of the reactive surface site density and potentially concomitant oscillations in the fluid saturation imply spatial and temporal variability in surface reaction rates. Knowledge of such variability could aid attempts to upscale microscopic rates and predict reactive transport through changing porous media.
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Lu Y, Geng J, Wang K, Zhang W, Ding W, Zhang Z, Xie S, Dai H, Chen FR, Sui M. Modifying Surface Chemistry of Metal Oxides for Boosting Dissolution Kinetics in Water by Liquid Cell Electron Microscopy. ACS NANO 2017; 11:8018-8025. [PMID: 28738154 DOI: 10.1021/acsnano.7b02656] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Dissolution of metal oxides is fundamentally important for understanding mineral evolution and micromachining oxide functional materials. In general, dissolution of metal oxides is a slow and inefficient chemical reaction. Here, by introducing oxygen deficiencies to modify the surface chemistry of oxides, we can boost the dissolution kinetics of metal oxides in water, as in situ demonstrated in a liquid environmental transmission electron microscope (LETEM). The dissolution rate constant significantly increases by 16-19 orders of magnitude, equivalent to a reduction of 0.97-1.11 eV in activation energy, as compared with the normal dissolution in acid. It is evidenced from the high-resolution TEM imaging, electron energy loss spectra, and first-principle calculations where the dissolution route of metal oxides is dynamically changed by local interoperability between altered water chemistry and surface oxygen deficiencies via electron radiolysis. This discovery inspires the development of a highly efficient electron lithography method for metal oxide films in ecofriendly water, which offers an advanced technique for nanodevice fabrication.
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Affiliation(s)
| | | | | | - Wei Zhang
- Department of Materials Science, Jilin University , Changchun 130012, China
| | | | | | | | | | - Fu-Rong Chen
- Department of Engineering and System Science, National Tsing Hua University , Kuang-Fu Road, Hsinchu 30013, Taiwan
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