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- W3095347986 abstract "• Speciation and surface charging of calcite in water are important. • Transfer of dissolved Ca 2+ ions from EDL to the interface is a key step. • Water molecules at the interface restricts the dissolved Ca 2+ ions transfer. • Attaining a threshold entropy state – a saturation level – is required. • Estimated level of Ca 2+ ions, in EDL’/‘interfacial area, is ~5 × 10 −4 M/m 2 . Speciation at the calcite-water interface and surface charge of calcite are essential for calcite usage in interfacial-dependent applications. The transfer of dissolved Ca 2+ ions between the electrical double layer (EDL) and the interface is a key step in the speciation process. The ice-like layer water-molecules at the interface represents a barrier that restricts this transmittance unless the dissolved Ca 2+ ions in the EDL attain a threshold (minimum) entropy state – a saturation level – where the electric field acting on the dissolved Ca 2+ ions could be stronger enough for their movement through the ice-like layer. This threshold state was estimated to be at aEDL Ca 2+ level ~5 × 10 −4 M/m 2 (dissolved Ca 2+ ions content in EDL’/‘interfacial area’). The transmitted Ca 2+ ions chemisorb at the interfacial carbonate sites (> CO 3 2 - ) and lead to speciation of calcium carbonate ion complexes (>CO 3 -Ca - ( H 2 O ) x + , x: degree of hydration) and polymorphs. Therefore, the surface charging behavior of calcite, subsequent to interfacial adsorption of the dissolved Ca 2+ ions, relies on the degree of hydration and the polymorphic characteristics of these complexes." @default.
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- W3095347986 date "2021-02-01" @default.
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- W3095347986 title "Dissolved Ca2+ ions adsorption and speciation at calcite-water interfaces: Thermodynamics and spectroscopic studies" @default.
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- W3095347986 doi "https://doi.org/10.1016/j.seppur.2020.117834" @default.
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