Results 261 to 270 of about 165,819 (299)
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Hydrophobicity of Hydroxylated Amorphous Fused Silica Surfaces
Langmuir, 2013Understanding the mechanism of water adsorption on silica is important in many fields of science and technology, such as geo- and atmospheric chemistry. Vibrational IR-visible sum-frequency generation (SFG) spectroscopy of hydroxyls (~3100-3800 cm(-1)) at the amorphous SiO2 surface in contact with air of varying relative humidity provides information ...
Oleksandr, Isaienko, Eric, Borguet
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Arresting ultraviolet-laser damage in fused silica
Optics Letters, 1999The 351-nm laser-damage initiation threshold for surface damage in conventionally polished fused silica is demonstrated to be stress dependent. By circumferential application of modest loads to a sample, a controllable stress field can be established within the clear aperture of a fused-silica specimen, in response to which both the damage-initiation ...
F, Dahmani +4 more
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Fused silica long-term stability: case studies
SPIE Proceedings, 2011The time stability of fused silica is investigated, reporting new data on two flats that were purchased in 1981. It is found that their present shape is no more plane, exhibiting instead a concavity that is compatible with a very slow laminar flow under the action of gravity. The data are examined altogether with those of prior observations, confirming
Vannoni Maurizio +2 more
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Proceedings of the Physical Society, 1960
Cone fractures have been produced in fused silica, by indenters ranging from fraction one-sixtyfourths inch to ¼ inch diameter. In some respects these differ from cone cracks in silicate glass. Those in silica have a significantly smaller semi-angle, 65.5 as opposed to 68.5° in glass. Whereas cracks in glass grow indefinitely under a constant load, and
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Cone fractures have been produced in fused silica, by indenters ranging from fraction one-sixtyfourths inch to ¼ inch diameter. In some respects these differ from cone cracks in silicate glass. Those in silica have a significantly smaller semi-angle, 65.5 as opposed to 68.5° in glass. Whereas cracks in glass grow indefinitely under a constant load, and
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Chemical Interactions in Titanium-Implanted Fused Silica
Materials Science Forum, 1995Amorphous nanoclusters of titanium silicides have been synthesized by implanting 30 keV-titanium ions, at a fluence of 1x10(17) cm(-2) in amorphous silica. The cluster stoichiometry was [Ti]/[Si]=1.1+/-0.3, as obtained by energy dispersive spectroscopic (EDS) x-ray micro-analysis and confirmed by x-ray photoelectron spectroscopy (XPS) analysis ...
BERTONCELLO, RENZO +6 more
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Fused Silica Lightweight Mirror Blanks
IEEE Transactions on Aerospace and Electronic Systems, 1969The construction of lightweight mirrors requires materials with good welding properties that also are free from creeping effects. The described construction gives a good balance between weight reduction (50 to 60 percent) and rigidity. The ability of the mirror to withstand mechanical and thermal loads is proved by measurements of surface distortion ...
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Journal of the American Ceramic Society, 1960
The hot pressing of powdered fused silica at temperatures below the melting and devitrification regions is described. The fabrication of high‐density shapes of fused silica is possible by this process. A relation expressing densification as a function of viscosity, time, applied pressure, and initial compaction is essentially substantiated.
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The hot pressing of powdered fused silica at temperatures below the melting and devitrification regions is described. The fabrication of high‐density shapes of fused silica is possible by this process. A relation expressing densification as a function of viscosity, time, applied pressure, and initial compaction is essentially substantiated.
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Polymer-Clad Fused-Silica Optical Fiber
Applied Optics, 1974Y, Suzuki, H, Kashiwagi
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