Enhancing the activation of silicon carbide tracer particles for PEPT applications using gas-phase deposition of alumina at room temperature and atmospheric pressure
| Autor: | David Parker, David Valdesueiro, Pablo García-Triñanes, Michiel T. Kreutzer, Jonathan Seville, Thomas Leadbeater, Joseph Gargiuli, Gabriel Marinus Henricus Meesters, J.R. van Ommen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Nuclear and High Energy Physics Ion beam chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Atomic layer deposition chemistry.chemical_compound 020401 chemical engineering Chemical engineering chemistry Aluminium Aluminium oxide Silicon carbide Particle Deposition (phase transition) 0204 chemical engineering Thin film 0210 nano-technology Instrumentation |
| Zdroj: | Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 807 |
| ISSN: | 0168-9002 |
| Popis: | We have enhanced the radio-activation efficiency of SiC (silicon carbide) particles, which by nature have a poor affinity towards F-18 ions, to be employed as tracers in studies using PEPT (Positron Emission Particle Tracking). The resulting SiC-Al2O3 core-shell structure shows a good labelling efficiency, comparable to y-Al2O3 tracer particles, which are commonly used in PEPT. The coating of the SiC particles was carried at 27 +/- 3 degrees C and 1 bar in a fluidized bed reactor, using trimethylaluminium and water as precursors, by a gas phase technique similar to atomic layer deposition. The thickness of the alumina films, which ranged from 5 to 500 nm, was measured by elemental analysis and confirmed with FIB-TEM (focused ion beam - transmission electron microscope), obtaining consistent results from both techniques. By depositing such a thin film of alumina, properties that influence the hydrodynamic behaviour of the SiC particles, such as size, shape and density, are hardly altered, ensuring that the tracer particle shows the same flow behaviour as the other particles. The paper describes a general method to improve the activation efficiency of materials, which can be applied for the production of tracer particles for many other applications too. (C) 2015 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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