Bischoff, Lothar ; Stephan, Michael ; Birkel, Christina S. ; Litterscheid, Christian F. ; Dreizler, Andreas ; Albert, Barbara (2018)
Multiscale and luminescent, hollow microspheres for gas phase thermometry.
In: Scientific Reports, 2018, 8 (1)
doi: 10.1038/s41598-017-18942-2
Article, Secondary publication, Publisher's Version
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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 ; Stephan, Michael ; Birkel, Christina S. ; Litterscheid, Christian F. ; Dreizler, Andreas ; Albert, Barbara |
| Type of entry: | Secondary publication |
| Title: | Multiscale and luminescent, hollow microspheres for gas phase thermometry |
| Language: | English |
| Date: | 2018 |
| Year of primary publication: | 2018 |
| Publisher: | Nature Publ. Group |
| Journal or Publication Title: | Scientific Reports |
| Volume of the journal: | 8 |
| Issue Number: | 1 |
| DOI: | 10.1038/s41598-017-18942-2 |
| URL / URN: | https://doi.org/10.1038/s41598-017-18942-2 |
| Origin: | Secondary publication via sponsored Golden Open Access |
| 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. |
| Status: | Publisher's Version |
| URN: | urn:nbn:de:tuda-tuprints-72035 |
| Classification DDC: | 500 Science and mathematics > 540 Chemistry |
| Divisions: | 16 Department of Mechanical Engineering 07 Department of Chemistry 07 Department of Chemistry > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie 07 Department of Chemistry > Eduard Zintl-Institut |
| Date Deposited: | 21 Jan 2018 20:55 |
| Last Modified: | 03 Jul 2024 02:59 |
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| Suche nach Titel in: | TUfind oder in Google |
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