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Multiscale and luminescent, hollow microspheres for gas phase thermometry

Bischoff, Lothar and Stephan, Michael and Birkel, Christina S. and Litterscheid, Christian F. and Dreizler, Andreas and Albert, Barbara (2018):
Multiscale and luminescent, hollow microspheres for gas phase thermometry.
8, In: Scientific Reports, (1), Nature Publ. Group, ISSN 2045-2322, DOI: 10.1038/s41598-017-18942-2,
[Online-Edition: https://doi.org/10.1038/s41598-017-18942-2],
[Article]

Abstract

Recently developed laser-based measurement techniques are used to image the temperatures and velocities in gas flows. They require new phosphor materials with an unprecedented combination of properties. A novel synthesis procedure is described here; it results in hierarchically structured, hollow microspheres of Eu3+-doped Y2O3, with unusual particle sizes and very good characteristics compared to full particles. Solution-based precipitation on polymer microballoons produces very stable and luminescent, ceramic materials of extremely low density. As a result of the – compared to established template-directed syntheses – reduced mass of polymer that is lost upon calcination, micron-sized particles are obtained with mesoporous walls, low defect concentrations, and nanoscale wall thicknesses. They can be produced with larger diameters (~25 µm) compared to known hollow spheres and exhibit an optimized flow behavior. Their temperature sensing properties and excellent fluidic follow-up behavior are shown by determining emission intensity ratios in a specially designed heating chamber. Emission spectroscopy and imaging, electron microscopy and X-ray diffraction results are presented for aerosolizable Y2O3 with an optimized dopant concentration (8%). Challenges in the field of thermofluids can be addressed by combined application of thermometry and particle image velocimetry with such hollow microparticles.

Item Type: Article
Erschienen: 2018
Creators: Bischoff, Lothar and Stephan, Michael and Birkel, Christina S. and Litterscheid, Christian F. and Dreizler, Andreas and Albert, Barbara
Title: Multiscale and luminescent, hollow microspheres for gas phase thermometry
Language: English
Abstract:

Recently developed laser-based measurement techniques are used to image the temperatures and velocities in gas flows. They require new phosphor materials with an unprecedented combination of properties. A novel synthesis procedure is described here; it results in hierarchically structured, hollow microspheres of Eu3+-doped Y2O3, with unusual particle sizes and very good characteristics compared to full particles. Solution-based precipitation on polymer microballoons produces very stable and luminescent, ceramic materials of extremely low density. As a result of the – compared to established template-directed syntheses – reduced mass of polymer that is lost upon calcination, micron-sized particles are obtained with mesoporous walls, low defect concentrations, and nanoscale wall thicknesses. They can be produced with larger diameters (~25 µm) compared to known hollow spheres and exhibit an optimized flow behavior. Their temperature sensing properties and excellent fluidic follow-up behavior are shown by determining emission intensity ratios in a specially designed heating chamber. Emission spectroscopy and imaging, electron microscopy and X-ray diffraction results are presented for aerosolizable Y2O3 with an optimized dopant concentration (8%). Challenges in the field of thermofluids can be addressed by combined application of thermometry and particle image velocimetry with such hollow microparticles.

Journal or Publication Title: Scientific Reports
Volume: 8
Number: 1
Publisher: Nature Publ. Group
Divisions: 16 Department of Mechanical Engineering
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Anorganische Chemie
Date Deposited: 21 Jan 2018 20:55
DOI: 10.1038/s41598-017-18942-2
Official URL: https://doi.org/10.1038/s41598-017-18942-2
URN: urn:nbn:de:tuda-tuprints-72035
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