Ion-specific effects on the kinetics of mineral dissolution

Ruíz-Agudo, Encarnación; Urosevic, Maja; Putnis, Christine V.; Rodríguez-Navarro, Carlos; Cardell, Carolina; Putnis, Andrew

doi:10.1016/j.chemgeo.2011.01.003

Cited by 68 publications

(62 citation statements)

References 44 publications

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“…Confinement can enable control over size, polymorphism and orientation, single crystal/polycrystalline structure, and morphology [13]. At the same time, modification of the solvation environment through the addition to the solution of organics [14], peptides [15], polymers [16], or simple ionic salts [17][18][19][20], can influence the kinetics and thermodynamics of crystal nucleation and growth. A perfect example of a crystallization process that occurs within a confined environment and in multicomponent aqueous solutions is biomineralization [2,21].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Hydroxyapatite Nanopores in Contact with Electrolyte Solutions: The Effect of Nanoconfinement and Solvated Ions on the Surface Reactivity and the Structural, Dynamical, and Vibrational Properties of Water

et al. 2017

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Hydroxyapatite, the main mineral phase of mammalian tooth enamel and bone, grows within nanoconfined environments and in contact with aqueous solutions that are rich in ions. Hydroxyapatite nanopores of different pore sizes (20 Å ≤ H ≤ 110 Å, where H is the size of the nanopore) in contact with liquid water and aqueous electrolyte solutions (CaCl 2 (aq) and CaF 2 (aq)) were investigated using molecular dynamics simulations to quantify the effect of nanoconfinement and solvated ions on the surface reactivity and the structural and dynamical properties of water. The combined effect of solution composition and nanoconfinement significantly slows the self-diffusion coefficient of water molecules compared with bulk liquid. Analysis of the pair and angular distribution functions, distribution of hydrogen bonds, velocity autocorrelation functions, and power spectra of water shows that solution composition and nanoconfinement in particular enhance the rigidity of the water hydrogen bonding network. Calculation of the water exchange events in the coordination of calcium ions reveals that the dynamics of water molecules at the HAP-solution interface decreases substantially with the degree of confinement. Ions in solution also reduce the water dynamics at the surface calcium sites. Together, these changes in the properties of water impart an overall rigidifying effect on the solvent network and reduce the reactivity at the hydroxyapatite-solution interface. Since the process of surface-cation-dehydration governs the kinetics of the reactions occurring at mineral surfaces, such as adsorption and crystal growth, this work shows how nanoconfinement and solvation environment influence the molecular-level events surrounding the crystallization of hydroxyapatite.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Hydroxyapatite Nanopores in Contact with Electrolyte Solutions: The Effect of Nanoconfinement and Solvated Ions on the Surface Reactivity and the Structural, Dynamical, and Vibrational Properties of Water

et al. 2017

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“…The latter is chemically different than mica and, although only weakly charged, provides an appropriate hydration landscape that allows for the formation of ionic structures stable enough to be observed by AFM. The generality of the effect suggests that it could play an important role in wide range of systems, for example, in controlling and enhancing charge transport at interfaces 12,38 , in influencing crystal growth 17 or the stability of colloidal solutions and emulsions 18 . In addition, this effect could also be exploited in the design and self-assembly of nanomaterials 39 and used to template nanostructures 16 .…”

mentioning

confidence: 99%

“…This assumption becomes problematic at the nanoscale where most solids exhibit some structure with localized charges and a welldefined hydration landscape that can determine the position and organization of single ions at the interface. Such a complexity is key to many processes such as the folding and function of biomolecules 11 , the accumulation and transfer of charges at the surface of extremophiles 12,13 or at the electrodes of solar cells 14 , electro-friction 15 , the nucleation of nanoparticles on surfaces 16 , or the preferential adsorption of a particular type of ion onto minerals 17 . Even at the macroscopic level, intense research is currently dedicated to the synthesis of colloid particles exhibiting non-homogeneous charge distributions at their surface for better controlling the stability or ordering of colloidal solutions 18 .…”

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confidence: 99%

Water-induced correlation between single ions imaged at the solid–liquid interface

2014

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When immersed into water, most solids develop a surface charge, which is neutralized by an accumulation of dissolved counterions at the interface. Although the density distribution of counterions perpendicular to the interface obeys well-established theories, little is known about counterions' lateral organization at the surface of the solid. Here we show, by using atomic force microscopy and computer simulations, that single hydrated metal ions can spontaneously form ordered structures at the surface of homogeneous solids in aqueous solutions. The structures are laterally stabilized only by water molecules with no need for specific interactions between the surface and the ions. The mechanism, studied here for several systems, is controlled by the hydration landscape of both the surface and the adsorbed ions. The existence of discrete ion domains could play an important role in interfacial phenomena such as charge transfer, crystal growth, nanoscale self-assembly and colloidal stability.

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“…Many efforts have been made to uncover the origin of Hofmeister effects. Generally, Hofmeister effects were observed at relatively high ionic concentrations (>100 mmol/L), where the long-range electrostatic interactions are screened, the hydration 12,21,22 and dispersion effects [23][24][25][26][27] become significant and are employed to interpret Hofmeister effects. However, further studies indicated that Hofmeister effects are also present at low electrolyte concentration (<100 mmol/L or even lower).…”

Section: Introductionmentioning

confidence: 99%

“…4 Over the last decades, Hofmeister effects have been observed ubiquitously in colloidal, nanocrystal and biological systems, including bacteria growth, 5,6 enzyme activity, [7][8][9] colloidal stability, 3,10 cation exchange equilibrium 11 and mineral dissolution. 12 These effects can influence the interactions of ions with different interfaces (metal/water, air/water, oil/water and water/solid), 13,14 as well as affect the physicochemical properties of the solution or colloids, such as activity coefficient, Zeta potential, freezing point, osmotic pressure, photoluminescence and catalytic properties. [14][15][16][17][18][19][20] The widespread applicability of Hofmeister effects in different fields and their unclear origin make the clarification of the underlying mechanism one of the tremendous challenges in interfacial and colloidal science.…”

Section: Introductionmentioning

confidence: 99%

Impact of electric field on Hofmeister effects in aggregation of negatively charged colloidal minerals

Tang

Zhu

et al. 2016

J Chem Sci

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Abstract. In this study, the aggregation kinetics of negatively charged colloidal minerals in Na2+ , Ca 2+ and Cu 2+ solutions were measured and Hofmeister effects therein were estimated through total average aggregation (TAA) rates and critical coagulation concentration (CCC). Hofmeister effects of TAA rates increased exponentially with the increase in electric field strength, which cannot be explained by the classical theories (i.e., ionic size, hydration and dispersion forces), indicating strong electric field at colloidal surface was an indispensable factor in studying Hofmeister effects. Meanwhile, Hofmeister series of CCC values Nashow fine correlation with the polarization of various cations, implying that onic polarization in strong electric field would be responsible for Hofmeister effects in aggregation of colloidal minerals, and the deduction was confirmed by the calculated results of electrostatic interactions between colloidal minerals.

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Ion-specific effects on the kinetics of mineral dissolution

Cited by 68 publications

References 44 publications

Molecular Dynamics Simulations of Hydroxyapatite Nanopores in Contact with Electrolyte Solutions: The Effect of Nanoconfinement and Solvated Ions on the Surface Reactivity and the Structural, Dynamical, and Vibrational Properties of Water

Molecular Dynamics Simulations of Hydroxyapatite Nanopores in Contact with Electrolyte Solutions: The Effect of Nanoconfinement and Solvated Ions on the Surface Reactivity and the Structural, Dynamical, and Vibrational Properties of Water

Water-induced correlation between single ions imaged at the solid–liquid interface

Impact of electric field on Hofmeister effects in aggregation of negatively charged colloidal minerals

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