Nanoparticles formed during mineral-fluid interactions

Putnis, Christine V.; Ruíz-Agudo, Encarnación

doi:10.1016/j.chemgeo.2021.120614

Cited by 15 publications

(10 citation statements)

References 208 publications

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“…and Putnis and Ruiz-Agudo demonstrated that nanoparticles also form during dissolution of diverse minerals. For example, Mg-carbonate nanoparticles form on the surface of brucite, which is dissolving and forming etch pits (Figure in Putnis and Ruiz-Agudo) . The nanocrystalline phase could in this way grow in crystallographic continuity with another secondary phase, in which it would become embedded as nanodomains (Figure ).…”

Section: Resultsmentioning

confidence: 97%

“…Recently, it has been found that this process also occurs in carbonates (Gehrke et al; Liu et al; Takasaki et al; Sun et al). − Observations by AFM on dissolving mineral surfaces by Putnis et al . and Putnis and Ruiz-Agudo demonstrated that nanoparticles also form during dissolution of diverse minerals. For example, Mg-carbonate nanoparticles form on the surface of brucite, which is dissolving and forming etch pits (Figure in Putnis and Ruiz-Agudo) .…”

Section: Resultsmentioning

confidence: 99%

“…. Putnis et al and Putnis and Ruiz-Agudo show by atomic force microscopy (AFM) that novel exotic phases occur as a result of local supersaturation, and local conditions may also explain the formation of dolomitic domains.…”

Section: Resultsmentioning

confidence: 99%

“…The domains then would have formed as a result of auto-induced modulation of solution composition at the growth front, which could occur due to dynamics of diffusion vs dissolution/precipitation (see Barge et al). 45 Putnis et al 52 and Putnis and Ruiz-Agudo 53 show by atomic force microscopy (AFM) that novel exotic phases occur as a result of local supersaturation, and local conditions may also explain the formation of dolomitic domains. Alternatively, nanodomains could have been inherited from a precursor that already contained inclusions of a phase embedded in a surrounding matrix of a different phase, e.g., nanoparticles that already contained a motif of a dolomitic structure within an amorphous matrix.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Nanoscale Pathway of Modern Dolomite Formation in a Shallow, Alkaline Lake

Meister

Frisia

Dódony

et al. 2023

Crystal Growth & Design

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Dolomite [CaMg(CO 3 ) 2 ] formation under Earth surface conditions is considered largely inhibited, yet protodolomite (with a composition similar to dolomite but lacking cation ordering), and in some cases also dolomite, was documented in modern shallow marine and lacustrine, evaporative environments. Authigenic carbonate mud from Lake Neusiedl, a shallow, episodically evaporative lake in Austria consists mainly of Mgcalcite with zoning of Mg-rich and Mg-poor regions in μm-sized crystals. Within the Mgrich regions, high-resolution transmission electron microscopy revealed < 5-nm-sized domains with dolomitic ordering, i.e., alternating lattice planes of Ca and Mg, in coherent orientation with the surrounding protodolomite. The calcite with less abundant Mg does not show such domains but is characterized by pitted surfaces and voids as a sign of dissolution. These observations suggest that protodolomite may overgrow Mg-calcite as a result of the changing chemistry of the lake water. During this process, oscillating concentrations (in particular of Mg and Ca) at the recrystallization front may have induced dissolution of Mg-calcite and growth of nanoscale domains of dolomite, which subsequently became incorporated as ordered domains in coherent orientation within less ordered regions. It is suggested that this crystallization pathway is capable of overcoming, at least at the nanoscale, the kinetic barrier to dolomite formation.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Nanoscale Pathway of Modern Dolomite Formation in a Shallow, Alkaline Lake

Meister

Frisia

Dódony

et al. 2023

Crystal Growth & Design

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“…The spectroscopic methods (infrared spectroscopy, Raman spectroscopy, and synchrotron-based X-ray approaches), , classical molecular dynamics, and density functional theory (DFT) approach have shed light on the solid surface chemistry and structure changes, helping us understand the interfacial reaction. Unfortunately, probing interfacial interaction in high resolution has always been a major challenge, mainly due to the experimental inaccessibility of buried crystalline interfaces. , Recent developments in liquid-phase transmission electron microscopy (LP-TEM) have already enabled the direct visualization of precipitation formation with high resolution. − Though powerful, this approach has significant technical challenges in precipitation observation due to several issues . For example, the electron beam drives nanoparticle rapid dissolution during LP-TEM analysis .…”

mentioning

confidence: 99%

Direct Atomic-Scale Insight into the Precipitation Formation at the Lanthanum Hydroxide Nanoparticle/Solution Interface

Wei

Yuan

Zhou

et al. 2023

J. Phys. Chem. Lett.

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Understanding precipitation formation at lanthanum hydroxide (La(OH)3) nanoparticle–solution interfaces plays a crucial role in catalysis, adsorption, and electrochemical energy storage applications. Liquid-phase transmission electron microscopy enables powerful visualization with high resolution. However, direct atomic-scale imaging of the interfacial metal (hydro)oxide nanostructure in solutions has been a major challenge due to their beam-driven dissolution. Combining focused ion beam and aberration-corrected high-angle annular dark-field scanning transmission electron microscopy, we present an atomic-scale study of precipitation formation at La(OH)3 nanoparticle interfaces after reaction with phosphate. The structure transformation is observed to occur at high- and low-crystalline La(OH)3 nanoparticle surfaces. Low-crystalline La(OH)3 mostly transformed and high-crystalline ones partly converted to LaPO4 precipitations on the outer surface. The long-term structure evolution shows the low transformation of high-crystalline La(OH)3 nanoparticles to LaPO4 precipitation. Because precipitation at solid–solution interfaces is common in nature and industry, these results could provide valuable references for their atomic-scale observation.

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Factors controlling reaction pathways during fluid–rock interactions

Filiberto,

Putnis,

Julia

2023

Contrib Mineral Petrol

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Potential fluid pathways for fluid–rock interactions and the factors controlling these pathways have been investigated experimentally by simulating hydrothermal conditions, using sample cubes of Carrara Marble (calcite) and an anorthosite (plagioclase) rock in different solutions (pure water, sodium chloride, artificial seawater, sodium phosphate and sodium silicate) at 200 °C. Analytical techniques including SEM, Raman Spectroscopy, atomic force microscopy, and Electron Microprobe Analysis were used to characterize fluid-induced reactions. Results show aqueous fluids can penetrate grain boundaries within rocks and, dependent on fluid and solid compositions, coupled replacement reactions can occur. The available fluid volume for the reaction in a grain boundary versus the bulk fluid can influence replacement reaction pathways. When 0.1 M Na2HPO4 was used with Carrara Marble, or a Na-silicate solution was used with anorthosite, the replacement of calcite by hydroxylapatite or labradorite by albite, respectively, occurred along the grain boundaries of both rock types. In the experiments using seawater, the replacement of calcite by Mg-carbonates occurred predominantly from the sides of the cube samples and the grain boundaries were minimally affected within the timescale of the experiments (1–3 months). With 1 M Na2HPO4, hydroxylapatite precipitated both along the marble grain boundaries and the sample sides. Models based on experimental observations and PhreeqC simulations highlight the importance of grain boundaries and interconnected porosity in fluid-induced reactions. Such factors play an important role in the kinetics and relative solubilities of rock systems by changing the conditions at the interfacial fluid–mineral boundary layer that will determine initial dissolution or precipitation and whether the supersaturation of a product phase is reached.

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Nanoparticles formed during mineral-fluid interactions

Cited by 15 publications

References 208 publications

Nanoscale Pathway of Modern Dolomite Formation in a Shallow, Alkaline Lake

Nanoscale Pathway of Modern Dolomite Formation in a Shallow, Alkaline Lake

Direct Atomic-Scale Insight into the Precipitation Formation at the Lanthanum Hydroxide Nanoparticle/Solution Interface

Factors controlling reaction pathways during fluid–rock interactions

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