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Fabrication and aero dynamic levitation of chalcogenide glass spheres

Fabrication and aero dynamic levitation of chalcogenide glass spheres
Fabrication and aero dynamic levitation of chalcogenide glass spheres
Spheres of gallium-lanthanum sulphide (GLS) and gallium lanthanum sulphite (GLSO) have been produced by laser irradiation on a copper hearth. Although similar fabrication techniques have been applied to oxide glasses, the technique has been overlooked for the production of chalcogenide glasses due to the perceived problem of the volatility of the chalcogens. In this work, glass microspheres of GLS/GLSO have been fabricated by laser irradiation of micron size irregular shaped glass particles on a Cu plate. In this material we found that evaporation of sulphur was not substantial as it appears to be more strongly chemically bound [1]. In addition to this method we have also established that it is possible to form larger spheres (mm diameter) of GLSO by aerodynamic levitation and laser heating using a CO2 laser (10.6 µm wavelength). Our studies involve overheating and supercooling of liquids and melts, outgassing analysis, high temperature resistivity measurements, and crystallization/structural studies [1-3]. In both fabrication methods the glasses could be melted and re-vitrified with low sulphur mass loss. We conclude that the production of glass spheres by laser irradiation[4] from irregular shaped starting material on a substrate using the wetting principle has substantial benefits for making microspheres and nanospheres.
Khan, K.
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Famer, T.
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Gholipour, B.
c17bd62d-9df6-40e6-bc42-65272d97e559
Leonard, V.
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Hewak, D.
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Barnes, A.C.
442915a8-e347-4e69-b724-4c7e8b60ebc8
Khan, K.
2b9242c4-2082-4bd3-843c-0c5e137b78f9
Famer, T.
9596512d-8600-48b6-ba12-b9df8ed66c54
Gholipour, B.
c17bd62d-9df6-40e6-bc42-65272d97e559
Leonard, V.
19532751-4c67-485c-8af4-7c3d0e4fc547
Hewak, D.
87c80070-c101-4f7a-914f-4cc3131e3db0
Barnes, A.C.
442915a8-e347-4e69-b724-4c7e8b60ebc8

Khan, K., Famer, T., Gholipour, B., Leonard, V., Hewak, D. and Barnes, A.C. (2012) Fabrication and aero dynamic levitation of chalcogenide glass spheres. International Symposium on Non-Oxide Glasses and New Optical Glasses (ISNOG 2012), France. 01 - 06 Jul 2012.

Record type: Conference or Workshop Item (Paper)

Abstract

Spheres of gallium-lanthanum sulphide (GLS) and gallium lanthanum sulphite (GLSO) have been produced by laser irradiation on a copper hearth. Although similar fabrication techniques have been applied to oxide glasses, the technique has been overlooked for the production of chalcogenide glasses due to the perceived problem of the volatility of the chalcogens. In this work, glass microspheres of GLS/GLSO have been fabricated by laser irradiation of micron size irregular shaped glass particles on a Cu plate. In this material we found that evaporation of sulphur was not substantial as it appears to be more strongly chemically bound [1]. In addition to this method we have also established that it is possible to form larger spheres (mm diameter) of GLSO by aerodynamic levitation and laser heating using a CO2 laser (10.6 µm wavelength). Our studies involve overheating and supercooling of liquids and melts, outgassing analysis, high temperature resistivity measurements, and crystallization/structural studies [1-3]. In both fabrication methods the glasses could be melted and re-vitrified with low sulphur mass loss. We conclude that the production of glass spheres by laser irradiation[4] from irregular shaped starting material on a substrate using the wetting principle has substantial benefits for making microspheres and nanospheres.

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e-pub ahead of print date: 2012
Venue - Dates: International Symposium on Non-Oxide Glasses and New Optical Glasses (ISNOG 2012), France, 2012-07-01 - 2012-07-06
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 376163
URI: http://eprints.soton.ac.uk/id/eprint/376163
PURE UUID: ad279c06-361c-45dc-ba09-a90e5c9a6bb9
ORCID for D. Hewak: ORCID iD orcid.org/0000-0002-2093-5773

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Date deposited: 22 Apr 2015 15:31
Last modified: 15 Oct 2019 00:54

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Contributors

Author: K. Khan
Author: T. Famer
Author: B. Gholipour
Author: V. Leonard
Author: D. Hewak ORCID iD
Author: A.C. Barnes

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