Characterization of boroaluminosilicate glass surface structures by B K-edge NEXAFS

Schaut, Robert A.; Lobello, R.; Mueller, Karl T.; Pantano, Carlo G.

doi:10.1016/j.jnoncrysol.2011.06.008

Cited by 11 publications

(9 citation statements)

References 30 publications

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“…This increase at the concentration of 4 B in the outer glass surface is consistent with the NEXAFS data discussed by Schaut et al 43 showing increased 4 B content in their glass surfaces. An example of the reactions occurring at the surface is shown in Figure 10A-D. Figure 10A shows the colors of the atoms (blue Si, red Al, green B, cyan Owater (Ow), grey O from the glass, and white protons; Na and Ca are removed from the image); the circle containing two 3 In addition, the connection of the two B's caused by the O from the water molecule is an example of a cause for the increase in BOB triples shown in Figure 8B for some glasses.…”

Section: Exposure To Watersupporting

confidence: 91%

“…shows the change in the original 3 B and 4 B concentrations in the glass surfaces attached to any O from the glass or water prior to and post water exposure. Inclusion of bonding to O from the water (Ow) still shows a decrease in the 3 B species in the glass surface, but also shows that inclusion of the Ow attached to B causes an increase in the concentration of 4 B in the outer surface.This increase at the concentration of 4 B in the outer glass surface is consistent with the NEXAFS data discussed by Schaut et al43 showing increased 4 B content in their glass surfaces.…”

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confidence: 91%

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Simulations of the surfaces of soda lime aluminoborosilicate glasses exposed to water

Garofalini

Urraca

2017

J Am Ceram Soc

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Molecular dynamics simulations of 7 compositionally different sodium calcium alumino‐borosilicate glasses showed formation of 4B and 5Al more consistent with experimental data without compromising the other structural features that match experimental results observed in recent simulations of these glasses. Analysis of the dry surfaces of these glasses show a lack of 4B in the top 5‐6 Å of the surface in comparison to the bulk concentration for all glasses and no 5Al. Upon exposure to water, the simulations show that the 3B in the top 5‐6 Å of the glasses are preferentially attacked, decreasing the number of B bonds to O originally from the glass, indicating a change in the glass network. Inclusion of all B–O bonds in the top 5‐6 Å (i.e., including O from water) shows a decrease in 3B but an increase in 4B that is consistent with NEXAFS analysis, which the simulations show are hydroxylated. There is an increase in the concentration of 3Al in the dry surface in comparison to the bulk, but exposure to water converts almost all of these 3Al to 4Al. Hydroxyl concentrations vary from 2.6/nm2 to 4.1/nm2, with SiOH and BOH dominating these surface hydroxyls. Upon exposure to water, network linkages to B are preferentially ruptured. This, and the preferential loss of the nonbridging oxygen sites attached to Na, provide atomistic evidence of the initial stages of removal of B and Na from glass surfaces exposed to water.

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Section: Exposure To Watersupporting

confidence: 91%

supporting

confidence: 91%

Simulations of the surfaces of soda lime aluminoborosilicate glasses exposed to water

Garofalini

Urraca

2017

J Am Ceram Soc

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“…Achieving the highest usable strength of glass fibers (USGF) requires fiber sizing to have certain hydrophobicity. In general, sizing development proceeds after candidate fiber chemistry being well defined; therefore, to find suitable sizing chemistry for new fibers for target applications, researchers continuously face challenges in acquiring specific knowledge of fiber surface chemistry/structure (can be different from bulk glass) including distributions of NBOs, borates (BO 4 vs BO 3 ), silicates (Q n ), hydroxyl concentrations, etc . Glass surface chemistry research is crucial and greatly needed.…”

Section: Challenges and Trend Of Specialty Fiber Glass Developmentmentioning

confidence: 99%

Composite reinforcement: Recent development of continuous glass fibers

Charpentier

et al. 2017

Int J of Appl Glass Sci

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International audienceLight weight, glass fiber-reinforced composites have gained a broad, global acceptance in commercial markets with a total of more than 7 billion of US dollars in revenue since its first commercial production in US in mid 1930s. This article briefly reviews recent development of continuous glass fibers with a focus on high-performance glass fibers. With accelerated commercial demands on high-performance glasses and/or glass fibers, there is a growing realization of fundamental needs in decoding nature of glass structures or “genes” of glass structure building blocks and establishing their relationships to properties of glasses or glass fibers. The related database development can enable researchers shortening the number of product development cycles to bring new fiber products to the market. A special section is, therefore, provided illustrating recent progress in characterizations of glass structures by using techniques of nuclear magnetic resonance spectroscopy, Raman spectroscopy, and molecular dynamics simulations

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“…While the measured differences are not quite so large in Figure 4D, and the K signal from the two surfaces is essentially the same, the untreated surface is again noticeably depleted of most inorganic ion species compared to the fracture surface. These stark differences between surface and bulk composition have previously been observed to occur as a function of forming operation, thermal history, and surface preparation, 17,18 and this system is no exception: knowledge of the bulk composition of a glass is insufficient to understand its surface. That is, the results presented herein demonstrate that it is difficult to infer the surface composition from the bulk composition and vice versa.…”

Section: Analysis Of the Positive Ion Spectramentioning

confidence: 93%

“…For example, glass surface composition may vary from the bulk composition for a variety of reasons, including the loss of volatile species during glass formation, species migration to minimize surface free energy, and chemical/structural differences resulting from the difference in environment between the glass/air interface and the bulk glass. [16][17][18][19] In addition, the surface composition of display glasses is modified by exposure to production-line chemistries, with examples including acids, bases, detergents, plasmas, or adsorption or incorporation of tin on the surface of glasses made by the float process. 1,20 The modifying effects of these treatments are complex and depend strongly on glass composition.…”

Section: Introductionmentioning

confidence: 99%

Time‐of‐flight secondary ion mass spectrometry of wet and dry chemically treated display glass surfaces

Cushman

Zakel²,

Sturgell

et al. 2017

J Am Ceram Soc

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Display glasses meet the demands of the flat panel display industry vis-a-vis their composition, flatness, and forming processes. Here, we report the high-resolution time-of-flight secondary ion mass spectrometry (ToF-SIMS) characterization of Corning â EAGLE XG â , a widely used display glass, and subsequent chemometric analyses of these data. Samples analyzed included the as-formed glass, fracture surfaces from remelt bars, and as-formed surfaces subsequently exposed to process-relevant treatments, including strong acids and bases, two industrial detergents, and an atmospheric-pressure plasma treatment. Elemental signals in the positive ion ToF-SIMS spectra respond to surface treatments. Acidic conditions leach non-silica components from the surfaces, while basic treatments extract these species less efficiently. The detergents leave residues of Na + and K + . The atmospheric pressure (AP) plasma treatment had little effect on the surface composition, while the melt surface differs significantly from the bulk fracture surface. Above ca. 75 m/z, the negative ion spectra are dominated by two series of homologous cluster ions with compositions of Si n O 2n+2 Al À and Si m HO 2m+1 H À . The presence of these clusters suggests that analogous structures exist at the near surface regions of the samples. In a series of multivariate curve resolution (MCR) analyses, two or three MCR components captured >95% of the variance in the data for these samples. K E Y W O R D S borosilicate glass,

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Characterization of boroaluminosilicate glass surface structures by B K-edge NEXAFS

Cited by 11 publications

References 30 publications

Simulations of the surfaces of soda lime aluminoborosilicate glasses exposed to water

Simulations of the surfaces of soda lime aluminoborosilicate glasses exposed to water

Composite reinforcement: Recent development of continuous glass fibers

Time‐of‐flight secondary ion mass spectrometry of wet and dry chemically treated display glass surfaces

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