期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 87, 期 -, 页码 118-128出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.supflu.2013.12.022
关键词
Continuous hydrothermal flow synthesis; (CHFS); Counter-current reactor; Supercritical water; Nanomaterials; Angle-dispersive diffraction; In situ high-energy synchrotron X-ray; diffraction imaging
资金
- EPSRC [EP/D504872/1, EP/E040551/1]
- ESRF
- Engineering and Physical Sciences Research Council [EP/D504872/1, EP/E040551/1] Funding Source: researchfish
- EPSRC [EP/E040551/1] Funding Source: UKRI
In situ high-energy synchrotron X-ray diffraction, a non-destructive synchrotron-based technique was employed to probe inside the steel tubing of a continuous hydrothermal flow synthesis (CHFS) mixer to spatially map, for the first time, the superheated water crystallisation of nanocrystalline ceria (CeO2) at three different (superheated-water) temperatures representing three unique chemical environments within the reactor. Rapid hydrothermal co-precipitation at the three selected temperatures led to similarly sized ceria nanoparticles ranging from 3 to 7 nm. 2D maps of CeO2 formation were constructed from the intensity and corresponding full width at half maximum (FWHM) values of the two most intense ceria reflections (111) and (002) for all three water inlet temperatures (350, 400 and 450 C at 24 MPa) and subsequent changes in the particle size distribution were analysed. The accompanying high-resolution transmission electron microscopy (HRTEM) and tomographic particle size maps have confirmed that the mean ceria particle size slightly increases with temperature. This X-ray tomographic imaging study amounted to a formidable technical and engineering challenge, nevertheless one that has been met; this represents a significant achievement in imaging science, given the dynamic nature and hostile environment of a working CHFS reactor.
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