Dissolution of Na2O·CaO·nSiO2 glasses in Na2CO3 solution for long-term and short-term experiments

Chen, Huei-Fen; Song, Sheng-Rong; Lo, Huann-Jih; Li, Lijun; Fang, Joyce; Chen, Yaw-Lin; Lin, I‐Chieh; Liu, Ya-Jiun; Liu, Chia-Mei; Kuo, Li Wei

doi:10.1016/j.jnoncrysol.2005.03.021

Cited by 8 publications

(2 citation statements)

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“…Dissolution is congruent if the molar ratios of the dissolved species in solution match those in the solid. Differences between solid and solution compositions is often observed during the dissolution of mixed oxide glasses and can be caused either by incongruent dissolution, which is the preferential leaching of specific cations from the silicate network to form a silicate-rich surface layer, , or by the formation of secondary precipitates, which consume ions released from the solid. In fact, some evidence of precipitation is observed in these experiments and during similar experiments on borosilicate glass (Figure c), as will be discussed shortly.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Silicate Dissolution Kinetics in Hyperalkaline Environments

Plante¹,

Oey²,

Hsiao³

et al. 2019

J. Phys. Chem. C

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The dissolution of silicate minerals and glasses in aqueous solutions is important in many natural and engineered contexts including mineral weathering, nuclear waste stabilization, cementation, and infrastructure degradation. The influences of electrolytes on dissolution rates have been extensively studied, but previous studies have used widely varying minerals and electrolytes, experimental conditions, and measurement techniques. Comparatively fewer studies have been conducted in hyperalkaline solutions that are encountered in concrete, geopolymers, and nuclear stabilization systems. This study seeks to control many of these variables to isolate the effects of electrolyte composition on altering the degree of dissolution of a soda lime silicate glass in hyperalkaline electrolyte solutions. A glass powder is dissolved in one of a series of static solutions having 10 mmol L–1 NaOH (pH 12) at (25 ± 0.2) °C and either an organic or an inorganic electrolyte at a concentration of 1 or 10 mmol L–1. The solution series was designed to reveal qualitatively how ion identity and concentration alter the glass’ degree of dissolution after prescribed exposure times. The results indicate that a relative dissolution enhancement of no greater than about 2.4 times can be induced at pH 12, with the greatest enhancements being observed for Na-benzoate, Na-citrate, and Na-malonate. The degree of dissolution is unaffected by most of the other salts examined. Broadly, the nucleophilic attack by OH– on Si–O bonds and the formation of O––Na+ surface complexes appear to be the most important factors influencing the dissolution rate at high pH. The adsorption and the influence on dissolution of other electrolyte ions are comparatively weak.

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Section: Resultsmentioning

confidence: 99%

Enhancing Silicate Dissolution Kinetics in Hyperalkaline Environments

Plante¹,

Oey²,

Hsiao³

et al. 2019

J. Phys. Chem. C

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“…According to our previous synthesis experiments for the zeolite group and pectolite, if the formation environment contains aluminum ion, zeolites will easily precipitate in hydrothermal fluids [22]. Hydrothermal synthetic pectolite is formed only when there are low aluminum contents, while calcite precipitates before pectolite at a temperature of about 150~210 • C [23]. This would indicate that, at this location, natrolite was initially formed in the initial aluminum-rich environment before calcite and pectolite, and, subsequently, some of the natrolite was replaced by pectolite (Supplementary File, Figure S2).…”

Section: Geological Genesis Of Larimar and Its Formation From The Alt...mentioning

confidence: 99%

Revealing the Secrets behind the Color and Sea-Wave Patterns of Larimar

Huang,

Shih,

Chen

et al. 2023

Minerals

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In the last century, a blue–green colored gemstone known as Larimar with a special sea-wave pattern was discovered in the Dominican Republic. Larimar is composed of the mineral pectolite, which has a chemical composition of NaCa2Si3O8(OH) and is usually white in color. Cu2+ has always been considered to be the primary genesis of the blue color shown in Larimar, because native copper often grows together with Larimar. To clarify whether copper is the main reason for the origin of blue–green pectolite, we utilized laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) techniques to analyze trace elements in the pectolite samples and compared the relationship between elements and colors. The results show that vanadium and iron are the main origins of the sky-blue and green color of Larimar. We also discovered that it is not only the chemical elements that affect the color shades of the mineral, but the orientation of the radial fiber crystals also plays a critical role. The sea-wave pattern and the changes in the color saturation of radial pectolite are due to the transmittance of visible light through different viewed angles under changing crystal orientations. Our results reveal the chemical and physical factors behind the color and sea-wave pattern of Larimar. In addition, to our knowledge, this is the first time that the formation age of Larimar has been proven to be approximately equal to or younger than 40 ka, using the U-Th dating of calcite growth together with pectolite.

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