Hollow glass microspheres for use in radiation shielding

The production of hollow glass microspheres from Li 2O–Al 2O 3–B 2O 3 glasses was investigated. The production of hollow, rather than solid, spheres is enabled by the use of blowing agents in the glass, such as sulfate compounds. Irregular glass frit (25–100 μm in diameter) was fed into a propane/ox...

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Bibliographic Details
Published in:	Journal of non-crystalline solids Vol. 352; no. 6; pp. 620 - 625
Main Authors:	Geleil, A.S., Hall, M.M., Shelby, J.E.
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Amsterdam Elsevier B.V 15-05-2006 Elsevier
Subjects:	Biological and medical sciences Borates Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science; rheology Exact sciences and technology Fundamental and applied biological sciences. Psychology General aspects, investigation technics, apparatus Glasses (including metallic glasses) Lattice dynamics Materials science Physics Raman spectroscopy Specific materials Tissues, organs and organisms biophysics Vibrational states in disordered systems 81.05.Kf Raman spectroscopy Borates Radiation effects Raman spectra Particle size Lithium oxides Shielding method Ternary systems Solubility Glass structure Inclusions Cosmic radiation Borate glasses Microspheres Hollow shape Synthesis Raman spectroscopy: Borates Vibrational modes Spherical particle Aluminium oxides
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Summary:	The production of hollow glass microspheres from Li 2O–Al 2O 3–B 2O 3 glasses was investigated. The production of hollow, rather than solid, spheres is enabled by the use of blowing agents in the glass, such as sulfate compounds. Irregular glass frit (25–100 μm in diameter) was fed into a propane/oxygen torch and spherodized. Solid spheres were easily obtained for all particle sizes and glass compositions studied, but the yield of spheres with single hollow cavities was very low. Raman scattering spectroscopy was performed on glass frit to determine glass structure and the presence of sulfur-containing groups. Glasses were batched to contain SO 3, but Raman spectra show the presence of bands due to SO 4 2 - . The Raman spectra presented do not show a clear relationship between glass composition (structure) and the yield of solid or hollow spheres. The solubility of sulfate in lithium aluminoborate glasses is around 1 wt%, based on the appearance of white Li 2SO 4 inclusions in glasses made to contain 1 wt% SO 3 or greater. Sulfate solubility in glass samples was also seen to decrease with increasing Al 2O 3 content.
ISSN:	0022-3093 1873-4812
DOI:	10.1016/j.jnoncrysol.2005.11.049