Structure and dissolution of silicophosphate glass

Takada, Kazuya; Tamura, Tomoyuki; Kasuga, Toshihiro

doi:10.1039/d2ra06707b

RSC Adv.

2022

DOI: 10.1039/d2ra06707b

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Structure and dissolution of silicophosphate glass

Kazuya Takada

Tomoyuki Tamura

Toshihiro Kasuga

Abstract: The solubility of P2O5–SiO2–Na2O–CaO glasses was suppressed by the coexistence of CaO and Na2O, attributed to the delocalization of the electron distribution of P in QP3 units coordinated to the six-fold-coordinated Si.

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Cited by 2 publications

References 46 publications

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Solids containing Si-O-P bonds: is the hydrolytic sol-gel route a suitable synthesis strategy?

Imparato,

Bifulco,

Malucelli

et al. 2023

J Sol-Gel Sci Technol

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Materials based on silicon-phosphorus mixed oxides have traditionally attracted interest in electronics, optics, catalysis, and related fields. The preparation of a solid containing stable Si–O–P linkages is a huge challenge due to their intrinsic instability to hydrolysis in a wet atmosphere. On the other hand, most technological applications of these materials, such as protonic conductive membranes in fuel cells and water-tolerant solid acid catalysts, are related to their interaction with water; consequently, suitable synthesis procedures that positively face this tradeoff are mandatory. Besides the traditional high-temperature techniques, sol-gel synthetic methods represent a viable, low-cost alternative, allowing for the preparation of high-purity materials with a homogeneous distribution of the components at the atomic scale. Si–O–P linkages are easily obtained by nonhydrolytic sol-gel routes, but only in inert and dry atmosphere. Conversely, hydrolytic routes offer opportunities to control the structure of the products in a wide range of processing conditions. The present review aims at providing an overall picture of the research on the sol-gel synthesis of phosphosilicate and related materials and theisr different applications, emphasizing how the interest in these systems is still lively, considering both conventional and emerging applications, such as flame retardance. The incorporation of Si–O–P nanostructures in polymer composites, coatings, and textiles is indeed a promising strategy to improve properties like thermal stability and fire resistance; however, their in-situ synthesis brings about additional difficulties related to the reactivity of the precursors. The perspectives linked with the development of Si–P-based materials are finally outlined. Graphical Abstract

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Solids containing Si-O-P bonds: is the hydrolytic sol-gel route a suitable synthesis strategy?

Imparato,

Bifulco,

Malucelli

et al. 2023

J Sol-Gel Sci Technol

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Preparation and structure of titanium‐containing pyrophosphate glasses prepared using the liquid‐phase method

Lee,

Shiraki,

Takahashi

et al. 2024

J Am Ceram Soc.

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Phosphate invert glasses (PIGs) exhibit excellent biocompatibility because of their high chemical durability and controlled ion releasability. PIGs are composed of short phosphate units such as ortho‐ and pyrophosphate. This structure makes it difficult to obtain clear glass using the melt‐quenching method. Our previous work reported that intermediate oxides (such as TiO2 and Nb2O5)‐containing PIGs exhibit good glass‐forming ability and ion dissolution controllability. This work used a liquid‐phase method to prepare PIGs at room temperature and pressure. Furthermore, TiO2 was used to control ion releasability for biomedical applications. Titanium‐containing PIGs were successfully prepared using a liquid‐phase method. Pyrophosphate and titania formed P‐O‐Ti bonds with an increasing TiO2 content in the glass, forming chain‐like structural units such as (‐O‐P‐O‐P‐O‐Ti‐O‐)n. The number of chain‐like structures increased with an increasing TiO2 content in the glass, improving the chemical durability. Hence, the ion releasability of titanium‐containing PIGs prepared using the liquid‐phase method can be controlled by the glass structure. Additionally, the PIGs exhibited good cell viability. Therefore, the PIGs are candidates for carriers of therapeutic inorganic ions for biomedical applications.

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Structure and dissolution of silicophosphate glass

Abstract: The solubility of P2O5–SiO2–Na2O–CaO glasses was suppressed by the coexistence of CaO and Na2O, attributed to the delocalization of the electron distribution of P in QP3 units coordinated to the six-fold-coordinated Si.

Cited by 2 publications

References 46 publications

Solids containing Si-O-P bonds: is the hydrolytic sol-gel route a suitable synthesis strategy?

Solids containing Si-O-P bonds: is the hydrolytic sol-gel route a suitable synthesis strategy?

Preparation and structure of titanium‐containing pyrophosphate glasses prepared using the liquid‐phase method

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