Comparison of the results of short-term static tests and single-pass flow-through tests with LRM glass.

Ebert, W. L.

doi:10.2172/925334

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…It is noteworthy that these fits should only be considered estimates because (many of) the curves, as shown in Figures and a, showed some evidence of nonlinear release, and none of the fits were constrained to pass through (0,0). These limitations with fitting of NL data with a single rate have been well-reported in previous studies. , All of the aluminoborate glasses showed convincing evidence of incongruent dissolution, with aluminum showing disproportionately lower extraction into the aqueous solutions (Figure b), and correspondingly slower extraction rates compared to that of Na or B (Figure a).…”

Section: Resultssupporting

confidence: 78%

“…These limitations with fitting of NL data with a single rate have been well-reported in previous studies. 82,83 All of the aluminoborate glasses showed convincing evidence of incongruent dissolution, with aluminum showing disproportionately lower extraction into the aqueous solutions (Figure 6b), and correspondingly slower extraction rates compared to that of Na or B (Figure 7a).…”

Section: Resultsmentioning

confidence: 97%

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Structural and Chemical Approach toward Understanding the Aqueous Corrosion of Sodium Aluminoborate Glasses

et al. 2018

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Despite an ongoing strenuous effort to understand the compositional and structural drivers controlling the chemical durability of oxide glasses, there is still no complete consensus on the basic mechanism of glass dissolution that applies to a wide composition space. One major reason for this problem is the structural complexity contained within the multicomponent silicate glasses chosen for glass corrosion studies. The nonsilicate network polyhedra present in these glasses interact with one another, often in unpredictable ways, by forming a variety of structural associations, for example, Al [IV] −B [III] and B [III] −B [IV] , resulting in significant influence on both the structure of the glass network and related macroscopic properties. Likewise, the formation of a variety of nextneighbor linkages, as well as increasingly complex interactions involving Si and differently coordinated next-nearest neighbor cations, is very difficult to decipher experimentally. Consideration of these factors motivates instead a different strategy: that is, the study of a sequence of SiO 2 free ternary or quaternary glass compositions, whose structures can be unambiguously determined and robustly linked to their corrosion properties. With this aim, the present study is focused on understanding the structural drivers governing the kinetics and mechanism of corrosion of ternary Na 2 O−Al 2 O 3 −B 2 O 3 glasses (in water) over a broad composition space comprising compositions with distinct structural features. It has been shown that the addition of Al 2 O 3 to binary sodium borate glasses decreases their corrosion rate in water and converts their dissolution behavior from congruent to incongruent leading to the formation of six-coordinated alumina, and higher concentration of four-coordinated boron (in comparison to pre-dissolution glasses) in post-dissolution glass samples. The drivers controlling the corrosion kinetics and mechanism in these glasses based on their underlying structure have been elucidated. Some open questions have been proposed which require an extensive analysis of surface chemistry of pre-and post-dissolution samples and will be investigated in our future work.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 97%

Structural and Chemical Approach toward Understanding the Aqueous Corrosion of Sodium Aluminoborate Glasses

et al. 2018

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“…have been carefully controlled and held constant. Interestingly, it is observed that the degradation rates of borosilicate glasses are higher in Tris-HNO 3 solutions, as compared to Tris-HCl solutions, which is contrary to the results reported by Tournié et al While these kinetic changes are statistically significant based upon the current error analysis, it is uncertain whether Tris-HCl versus Tris-HNO 3 rates are appreciably different, given the 15–25% systematic errors typically associated with the dissolution experiments − and the approximation involved in fitting NL data with a single rate. , Accordingly, manybut not allof the rate differences reported in Tris-HCl versus Tris-HNO 3 for the current compositions are within the usually attributed errors in dissolution experiments. Furthermore, a close agreement is observed for the NL values within the residual rate regime.…”

Section: Resultscontrasting

confidence: 85%

Composition–Structure–Solubility Relationships in Borosilicate Glasses: Toward a Rational Design of Bioactive Glasses with Controlled Dissolution Behavior

Stone-Weiss

Bradtmüller

Eckert

et al. 2021

ACS Appl. Mater. Interfaces

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Owing to their fast but tunable degradation kinetics (in comparison to silicates) and excellent bioactivity, the past decade has witnessed an upsurge in the research interest of borate/borosilicate-based bioactive glasses for their potential use in a wide range of soft tissue regeneration applications. Nevertheless, most of these glasses have been developed using trial-and-error approaches wherein SiO2 has been gradually replaced by B2O3. One major reason for using this empirical approach is the complexity of short-to-intermediate range structures of these glasses which greatly complicate the development of a thorough understanding of composition–structure–solubility relationships in these systems. Transitioning beyond the current style of composition design to a style that facilitates the development of bioactive glasses with controlled ion release tailored for specific patients/diseases requires a deeper understanding of the compositional/structural dependence of glass degradation behavior in vitro and in vivo. Accordingly, the present study aims to decipher the structural drivers controlling the dissolution kinetics and ion-release behavior of potentially bioactive glasses designed in the Na2O–B2O3–P2O5–SiO2 system across a broad compositional space in simulated body environments (pH = 7.4). By employing state-of-the-art spectroscopy-based characterization techniques, it has been shown that the degradation kinetics of borosilicate glasses depend on their R (Na2O/B2O3) and K (SiO2/B2O3) ratios, while the release of particular network-forming moieties from the glass into solution is strongly influenced by their role inand effect onthe short-to-intermediate-range molecular structure. The current study aims to promote a rational design of borosilicate-based bioactive glasses, where a delicate balance between maximizing soft tissue regeneration and minimizing calcification and cytotoxicity can be achieved by tuning the release of ionic dissolution products (of controlled identity and abundance) from bioactive glasses into physiological media.

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“…The specific surface areas for the -100 +200 mesh size fractions are 0.0196 m 2 /g for ARM-1 glass (density = 2.75 g cm -3 ) and for SRM 623 (density = 2.24 g cm -3 ); these were calculated by modeling the particles as spheres with diameters equal to the average sieve opening. The solution volume VW (in cm 3 ) was calculated from the mass of water used in the test and a density of 1.00 g cm -3 . The glass surface area-to-solution volume (S/V) ratio is a characteristic test parameter that varies in PCT-A conducted with glasses having different densities.…”

Section: Resultsmentioning

confidence: 99%

“…2 The PCT procedure recommends calculating the glass surface area available in the test by representing the particles as a simple geometric shape having one dimension equal to the arithmetic average of the sieve openings, such as the diameter of a spherical particle or edge of a cubic particle. The accuracy of that approach has been verified by comparing the kinetic reaction rates of monolithic samples of known area with that measured for crushed and sized glass [2,3]. The consistency of PCT responses is strongly affected by the consistency of the surface area that is availible for the glass samples used in each test; that depends on a consistent distribution of particle sizes in the prepared glass and the absence of fines.…”

Section: Methodsmentioning

confidence: 95%

The Precision of Product Consistency Tests with Reference Glasses ARM-1 and SRM 623

Ebert¹

2019

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Comparison of the results of short-term static tests and single-pass flow-through tests with LRM glass.

Cited by 6 publications

References 8 publications

Structural and Chemical Approach toward Understanding the Aqueous Corrosion of Sodium Aluminoborate Glasses

Structural and Chemical Approach toward Understanding the Aqueous Corrosion of Sodium Aluminoborate Glasses

Composition–Structure–Solubility Relationships in Borosilicate Glasses: Toward a Rational Design of Bioactive Glasses with Controlled Dissolution Behavior

The Precision of Product Consistency Tests with Reference Glasses ARM-1 and SRM 623

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