Effect of the Silicate Structure on Calcium Elution Behaviors of Calcium-silicate Based Mineral Phases in Aqueous Solution

Ruan, Fangming; Kawanishi, Sakiko; Sukenaga, Sohei; Shibata, Hiroyuki

doi:10.2355/isijinternational.isijint-2019-263

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…Such degradation of cuspidine is plausible as it is known to release relatively large amounts of F − and Ca 2+ ions in aqueous solutions at pH 7–8 and therefore is less stable than fluorite or FAp 43 , 44 . The faster degradation of cuspidine compared to the other silicate phases present is probably related to its weakly polymerised silicate structure 40 (disrupted sorosilicate with very weak [Si 2 O 7 ] 6− -dimer band at 715 cm −1 , Fig. 3 ) 42 , 45 .…”

Section: Resultsmentioning

confidence: 96%

“…Even though crystalline silicates typically show a better stability in aqueous solutions than comparable amorphous phases, considerable leaching of alkali or alkaline earth ions and solubility of calcium silicate minerals is well-known from slags and cements 40 , 41 . Hence, the decrease in the GC’s silicate crystallinity, caused by ion exchange in the silicate minerals, is accompanied by the degradation of the crystalline species.…”

Section: Resultsmentioning

confidence: 99%

“…the silicate mineral with the highest NC. Based on the silicate NC, one would expect cuspidine (with its Si 2 O 7 6− pyrosilicate anions, possibly disrupted into SiO 4 4− orthosilicate anions, NC ≤ 1) to show more pronounced Ca release than the chain silicate wollastonite (SiO 3 2− metasilicate anions, NC = 2) 40 . followed by the double-chain silicate xonotlite (Si 6 O 17 10− anions, NC = 2.33) 30 .…”

Section: Resultsmentioning

confidence: 99%

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Bioactive glass–ceramics containing fluorapatite, xonotlite, cuspidine and wollastonite form apatite faster than their corresponding glasses

Kirste,

Contreras Jaimes,

de Pablos-Martín

et al. 2024

Sci Rep

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Crystallisation of bioactive glasses has been claimed to negatively affect the ion release from bioactive glasses. Here, we compare ion release and mineralisation in Tris–HCl buffer solution for a series of glass–ceramics and their parent glasses in the system SiO2–CaO–P2O5–CaF2. Time-resolved X-ray diffraction analysis of glass–ceramic degradation, including quantification of crystal fractions by full pattern refinement, show that the glass–ceramics precipitated apatite faster than the corresponding glasses, in agreement with faster ion release from the glass–ceramics. Imaging by transmission electron microscopy and X-ray nano-computed tomography suggest that this accelerated degradation may be caused by the presence of nano-sized channels along the internal crystal/glassy matrix interfaces. In addition, the presence of crystalline fluorapatite in the glass–ceramics facilitated apatite nucleation and crystallisation during immersion. These results suggest that the popular view of bioactive glass crystallisation being a disadvantage for degradation, apatite formation and, subsequently, bioactivity may depend on the actual system study and, thus, has to be reconsidered.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Bioactive glass–ceramics containing fluorapatite, xonotlite, cuspidine and wollastonite form apatite faster than their corresponding glasses

Kirste,

Contreras Jaimes,

de Pablos-Martín

et al. 2024

Sci Rep

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“…16, the experimental results deviated from the linear line when its maximum pH was smaller than 9. This could occur because as phases such as CAS 2 released only a small amount of Ca due to their low NBO/Si (NBO: Non-Bridging Oxygen) degree mentioned in previous studies, 19,20) the influences of O 2 and CO 2 gas from air could demonstrate stronger effects on the pH, and the pH values would be underestimated.…”

Section: Relation Between Maximum Ph Values and Camentioning

confidence: 93%

Contribution of Mineralogical Phases on Alkaline Dissolution Behavior of Steelmaking Slag

Zhu¹,

Gao

Ueda

et al. 2019

ISIJ Int.

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To suppress alkaline elution from steelmaking slag through microstructure control, in this study, several mineralogical phases identified in industrial steelmaking slag were synthesized, and their dissolution behaviors were investigated. The results indicated that in addition to free CaO and free MgO, 2CaO•SiO 2-3CaO•P 2 O 5 (C 2 S-C 3 P) is another reason for alkaline elution from steelmaking. To suppress the amount of C 2 S-C 3 P in steelmaking slag, reducing the slag basicity by the compositional modification of slag at the hot stage was considered. To determine the optimum composition, the contribution of newly formed primary crystalline phases must be clarified. Some primary crystalline phases in the CaO-SiO 2-FeO x-MgO-Al 2 O 3 system were synthesized, and their dissolution behaviors were evaluated. The results indicated that the formation of α-CaO•SiO 2 (α-CS), β-CaO•SiO 2 (β-CS), 3CaO•2SiO 2 (C 3 S 2), 2CaO•MgO•2SiO 2 (C 2 MS 2), and 3CaO•MgO•2SiO 2 (C 3 MS 2) must be restrained in slag modification. Based on the results, a slag with multiple components and low basicity was synthesized, and the suppression of alkaline elution by reduction of slag basicity and microstructure control was confirmed. Moreover, a method to predict Ca dissolution and pH change during the dissolution of slag by the combination of each crystal phase was proposed.

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Effect of the Silicate Skeleton Structure on the Dissolution Kinetics of Calcium Silicate Mineral Phases in Water

Ruan

Kawanishi

Sukenaga

et al. 2021

Metall Mater Trans B

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Effect of the Silicate Structure on Calcium Elution Behaviors of Calcium-silicate Based Mineral Phases in Aqueous Solution

Cited by 11 publications

References 16 publications

Bioactive glass–ceramics containing fluorapatite, xonotlite, cuspidine and wollastonite form apatite faster than their corresponding glasses

Bioactive glass–ceramics containing fluorapatite, xonotlite, cuspidine and wollastonite form apatite faster than their corresponding glasses

Contribution of Mineralogical Phases on Alkaline Dissolution Behavior of Steelmaking Slag

Effect of the Silicate Skeleton Structure on the Dissolution Kinetics of Calcium Silicate Mineral Phases in Water

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