A novel type of borosilicate glass with excellent chemical stability and high ultraviolet transmission

Peng, Shou; Ke, Zhenkun; Cao, Xin; Shan, Chuanli; Zhao, Fengyang; Guan, Min; Shi, Lei; Sun, Yinyong; Ma, Lifeng

doi:10.1016/j.jnoncrysol.2019.119735

Cited by 23 publications

(6 citation statements)

References 17 publications

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“…Being the most abundant nucleus in oxide glasses, oxygen is thus a potential source of crucial information and could be used, in our case, to differentiate and quantify P-O-P, P-O- [x] B, and even [x] B-O- [x] B linkages. Unfortunately, the NMR sensitive isotope 17 O does not present favorable NMR characteristics: its low natural abundance (0.037%) thus requires 17 O enrichment, and its 5/2 spin requires special NMR sequences to provide spectra with sufficient resolution. While 17 O has been widely used to analyze the structure of borosilicate-based glasses [65][66][67][68][69][70], there is, to our knowledge, only one paper about 17 O NMR on enriched borophosphate glasses [26].…”

Section: Discussionmentioning

confidence: 99%

“…Unfortunately, the NMR sensitive isotope 17 O does not present favorable NMR characteristics: its low natural abundance (0.037%) thus requires 17 O enrichment, and its 5/2 spin requires special NMR sequences to provide spectra with sufficient resolution. While 17 O has been widely used to analyze the structure of borosilicate-based glasses [65][66][67][68][69][70], there is, to our knowledge, only one paper about 17 O NMR on enriched borophosphate glasses [26]. However, this paper from 2005 clearly showed the possibility of separating bridging P-O-P and P-O-B oxygens by using MQ-MAS NMR experiments [49] and there is no doubt that conducting such a study with the high field NMR machines and the correlation NMR sequences now available would provide a very interesting set of data that would shed new light onto the borophosphate network organization.…”

Section: Discussionmentioning

confidence: 99%

“…When a single GFO is used in combination with modifier oxides, the glass backbone is formed by interconnected polyhedra of the same chemical nature, and the glass is categorized as a simple network glass. Interesting results can also be obtained when two (or more) different GFOs are mixed in the same formulation [13][14][15][16][17][18][19][20][21][22][23][24]. In such cases, the glass backbone is formed by interconnected polyhedra of different chemical natures.…”

Section: Introductionmentioning

confidence: 99%

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Solid State NMR: A Powerful Tool for the Characterization of Borophosphate Glasses

2020

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This review will show how solid state nuclear magnetic resonance (NMR) has contributed to a better understanding of the borophosphate glass structure. Over the last fifteen years, 1D and 2D magic angle spinning (MAS)-NMR has been used to produce key information about both local and medium range organization in this type of glass. After a brief presentation on borophosphate glasses, the paper will focus on the description of the local order of phosphate and borate species obtained by 1D 31P-and 11B-MAS-NMR experiments, with a special emphasis on the improvements obtained at high magnetic fields on the borate speciation description. The last part of this review will show how correlation NMR provided new insights into the intermediate length scale order. Special attention will be paid to the quantitative data retrieved from 11B/31P REDOR-based NMR sequences and to the qualitative connectivity schemes observed on the 2D 11B/31P maps edited with the heteronuclear multiple quantum coherence (HMQC) NMR techniques.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solid State NMR: A Powerful Tool for the Characterization of Borophosphate Glasses

2020

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“…For instance, alkali borosilicates have been used as thermal shock‐resistant glasses, whereas alkaline earth borosilicate glasses are used as substrate glasses for liquid crystal displays when also mixed with alumina 1,9 . Understanding the structural origin of the properties of borosilicate glasses, such as hardness, is also significant in developing improved glass compositions that exhibit higher mechanical strength and scratch resistance wherever contact deformations are involved, for example, pharmaceutical packaging such as syringes, ampoules, and cartridges 10,11 …”

Section: Introductionmentioning

confidence: 99%

“…1,9 Understanding the structural origin of the properties of borosilicate glasses, such as hardness, is also significant in developing improved glass compositions that exhibit higher mechanical strength and scratch resistance wherever contact deformations are involved, for example, pharmaceutical packaging such as syringes, ampoules, and cartridges. 10,11 One of the primary reasons why borosilicate glasses exhibit a unique range of properties could be attributed to the well-known "boron anomaly," that is, the nonmonotonic variation in glass properties with composition. [1][2][3] This anomaly is related to the composition-dependent behavior of boron speciation, which takes a coordination number of four or three depending on the availability, or lack, of network modifiers.…”

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confidence: 99%

Quantifying the densification and shear flow under indentation deformation in borosilicate glasses

Kasimuthumaniyan

Sahoo

Smedskjær

et al. 2022

Int J of Appl Glass Sci

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Borosilicate glasses are used ubiquitously for a wide range of applications, where their mechanical properties play a critical role. However, the deformation mechanisms governing the sharp contact response of these glasses remain poorly understood. Herein, we analyze the role of elastoplastic response in determining the indentation deformation mechanisms for a range of borosilicate glass compositions. The series of glasses were made by varying the SiO2‐to‐B2O3 molar ratio while maintaining a constant content of network modifying alkali and alkaline earth oxides. We employed nanoindentation followed by annealing below the glass transition temperature to quantify the contribution of densification and shear flow as a function of glass composition. Interestingly, we observe that the volume recovery upon annealing is inversely proportional to the hardness of the glasses. This suggests that the resistance to permanent deformation is closely related to the network connectivity of the glasses, which in turn governs the mechanism of deformation under sharp contact loading. Overall, we show the important role of alkali and alkaline earth modifiers in governing the composition‐dependent indentation behavior of borosilicate glass series.

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Photostability of sennosides and their aglycones in solution

Meier,

Schenk

et al. 2024

Phytochemical Analysis

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IntroductionSennosides are the main active constituents of the dried leaves and/or pods of Senna alexandrina Mill. that are used as laxatives. A hypothesis is that aglycones are formed during the degradation of sennosides. However, it is unknown, whether this happens under visible light exposure and how photosensitive sennosides behave in solution.ObjectivesPure anthraquinone glycosides were tested on their behaviour during sample preparation in the lab under visible light exposure in dependence on the instability of the solvent.Materials and methodsSamples before and after exposure were analysed using UHPLC with UV/Vis and MS detection.ResultsUnder visible light protection, the solutions were stable for 14 days at room temperature whereas a loss of 20%–60% was measured after 1 day of light exposure. The loss of sennosides due to degradation can be as fast as up to 2%–2.5% per hour, which might have a tremendous impact on phytochemical analysis results during the course of an analysis. The formation of aglycones was not observed in the degradation of sennosides and rhein‐8‐O‐glucoside.ConclusionAglycones could not be found as a result of the forced degradation. The solutions of sennosides clearly need to be protected from light to obtain reliable analytical results, and light protection is a major point for the stability of liquid preparations.

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A novel type of borosilicate glass with excellent chemical stability and high ultraviolet transmission

Cited by 23 publications

References 17 publications

Solid State NMR: A Powerful Tool for the Characterization of Borophosphate Glasses

Solid State NMR: A Powerful Tool for the Characterization of Borophosphate Glasses

Quantifying the densification and shear flow under indentation deformation in borosilicate glasses

Photostability of sennosides and their aglycones in solution

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