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Multiscale and luminescent, hollow microspheres for gas phase thermometry

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, (1)
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Multiscale and luminescent, hollow microspheres for gas phase thermometry
Language: English
Date: 2018
Place of Publication: Darmstadt
Year of primary publication: 2018
Journal or Publication Title: Scientific Reports
Issue Number: 1
Series Volume: 8
Corresponding Links:
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: 07 Department of Chemistry > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie
Date Deposited: 16 Jan 2018 13:29
Last Modified: 13 Dec 2022 11:33
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/7203
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