Kinetics of dissolution of calcium fluoride crystals in sodium chloride solutions: influence of additives

Hamza, Salem M.; Hamdona, Samia K.

doi:10.1021/j100161a036

Cited by 27 publications

(15 citation statements)

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“…These values reflect the high equilibrium constant at low relative super saturation in the presence of cadmium ions. Similar dependence of the degree of inhibition with change of degree of saturation has been observed for the influence of some metal ions and other additives on the kinetic of crystallization and dissolution of many sparingly soluble salts [27][28][29][30][31]. The marked dependence upon degree of saturation of the effectiveness of precipitation inhibitors has important consequences in assessing the usefulness of these compounds for industrial applications such as the control of scale.…”

Section: Article In Presssupporting

confidence: 57%

“…The complete coverage of the crystal surface of gypsum by these metal ions is not possible, perhaps due to site competition by the growth units, or perhaps due to interactions between impurity species. Dissolution rate of calcium fluoride was reduced by more than 92% when only 6% of the crystals surface was covered by ENTMP molecules [30]. Moreover, the rate of crystallization of gypsum in the presence of phosphonates may be reduced virtually to zero when only 5-7% of the crystal surface was covered by adsorbed inhibitor molecules [27].…”

Section: Article In Pressmentioning

confidence: 99%

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Crystallization of calcium sulfate dihydrate in the presence of some metal ions

Hamdona¹,

Hadad²

2007

Journal of Crystal Growth

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100

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Section: Article In Presssupporting

confidence: 57%

Section: Article In Pressmentioning

confidence: 99%

Crystallization of calcium sulfate dihydrate in the presence of some metal ions

Hamdona¹,

Hadad²

2007

Journal of Crystal Growth

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100

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“…Fluorite (CaF 2 ) crystals are widely used for semiconductor lithography, 39 other laser technologies 40 and radioactivity investigations. 41,42 Their growth process in an aqueous environment is important not only for the fabrication of industrial devices but also for understanding the mechanism of bio-mineralisation, formation of the tooth enamel, 43,44 desalination for oil recovery [45][46][47] and water purification. [48][49][50] Hydration structures formed at the fluorite-water interface strongly influence ion adsorption and desorption in these processes.…”

Section: Afm Simulationmentioning

confidence: 99%

A relationship between three-dimensional surface hydration structures and force distribution measured by atomic force microscopy

et al. 2016

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Hydration plays important roles in various solid-liquid interfacial phenomena. Very recently, three-dimensional scanning force microscopy (3D-SFM) has been proposed as a tool to visualise solvated surfaces and their hydration structures with lateral and vertical (sub) molecular resolution. However, the relationship between the 3D force map obtained and the equilibrium water density, ρ(r), distribution above the surface remains an open question. Here, we investigate this relationship at an interface of an inorganic mineral, fluorite, and water. The force maps measured in pure water are directly compared to force maps generated using the solvent tip approximation (STA) model and from explicit molecular dynamics simulations. The results show that the simulated STA force map describes the major features of the experimentally obtained force image. The agreement between the STA data and the experiment establishes the correspondence between the water density used as an input to the STA model and the experimental hydration structure and thus provides a tool to bridge the experimental force data and atomistic solvation structures. Further applications of this method should improve the accuracy and reliability of both interpretation of 3D-SFM force maps and atomistic simulations in a wide range of solid-liquid interfacial phenomena.

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“…In addition, the growth mechanism of a fluorite crystal in aqueous solution was extensively studied in relation to the fabrication of optical components [35][36][37][38], formation of tooth enamel [39,40] and biomineralization [41][42][43][44][45][46]. Thus, the theoretical basis for atomistic molecular dynamics (MD) simulation of the fluorite-water interface was relatively well-established.…”

Section: Introductionmentioning

confidence: 99%

Influence of ions on two-dimensional and three-dimensional atomic force microscopy at fluorite–water interfaces

et al. 2017

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Abstract. Recent advancement in liquid-environment atomic force microscopy (AFM) has enabled us to visualize three-dimensional (3D) hydration structures as well as two-dimensional (2D) surface structures with subnanometer-scale resolution at solid-water interfaces. However, the influence of ions present in solution on the 2D-and 3D-AFM measurements has not been well understood. In this study, we perform atomic-scale 2D-and 3D-AFM measurements at fluorite-water interfaces in pure water and supersaturated solution of fluorite. The images obtained in these two environments are compared to understand the influence of the ions in solution on these measurements. In the 2D images, we found clear difference in the nanoscale structures but no significant difference in the atomic-scale contrasts. However, the 3D force images show clear difference in the subnanometer-scale contrasts. The force contrasts measured in pure water largely agree with those expected from the molecular dynamics simulation and the solvent tip approximation model. In the supersaturated solution, an additional force peak is observed over the negatively charged fluorine ion site. This location suggests that the observed force peak may originate from cations adsorbed on the fluorite surface. These results demonstrate that the ions can significantly alter the subnanometer-scale force contrasts in the 3D-AFM images.

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Kinetics of dissolution of calcium fluoride crystals in sodium chloride solutions: influence of additives

Cited by 27 publications

References 1 publication

Crystallization of calcium sulfate dihydrate in the presence of some metal ions

Crystallization of calcium sulfate dihydrate in the presence of some metal ions

A relationship between three-dimensional surface hydration structures and force distribution measured by atomic force microscopy

Influence of ions on two-dimensional and three-dimensional atomic force microscopy at fluorite–water interfaces

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