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Article

4D In-Situ Microscopy of Aerosol Filtration in a Wall Flow Filter

1
Department of Materials, University of Manchester, Manchester M13 9PL, UK
2
University of Manchester at Harwell, Diamond Light Source, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK
3
UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0FA, UK
4
Diamond Light Source, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK
5
Johnson Matthey Technology Centre, Blounts Court Road, Sonning Common, Reading RG4 9NH, UK
6
Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK
*
Authors to whom correspondence should be addressed.
Current address: Room 1.13, Research Complex at Harwell, Harwell Campus, Didcot, Oxfordshire OX11 0FA, UK.
Materials 2020, 13(24), 5676; https://doi.org/10.3390/ma13245676
Received: 9 November 2020 / Revised: 9 December 2020 / Accepted: 10 December 2020 / Published: 12 December 2020
(This article belongs to the Special Issue 4D X-ray Computed Tomography for Material Science)
The transient nature of the internal pore structure of particulate wall flow filters, caused by the continuous deposition of particulate matter, makes studying their flow and filtration characteristics challenging. In this article we present a new methodology and first experimental demonstration of time resolved in-situ synchrotron micro X-ray computed tomography (micro-CT) to study aerosol filtration. We directly imaged in 4D (3D plus time) pore scale deposits of TiO2 nanoparticles (nominal mean primary diameter of 25 nm) with a pixel resolution of 1.6 μm. We obtained 3D tomograms at a rate of ∼1 per minute. The combined spatial and temporal resolution allows us to observe pore blocking and filling phenomena as they occur in the filter’s pore space. We quantified the reduction in filter porosity over time, from an initial porosity of 0.60 to a final porosity of 0.56 after 20 min. Furthermore, the penetration depth of particulate deposits and filtration rate was quantified. This novel image-based method offers valuable and statistically relevant insights into how the pore structure and function evolves during particulate filtration. Our data set will allow validation of simulations of automotive wall flow filters. Evolutions of this experimental design have potential for the study of a wide range of dry aerosol filters and could be directly applied to catalysed automotive wall flow filters. View Full-Text
Keywords: X-ray micro-CT; synchrotron imaging; novel methods; in-situ; aerosol; filtration; porous media; particulate filter; particulate matter X-ray micro-CT; synchrotron imaging; novel methods; in-situ; aerosol; filtration; porous media; particulate filter; particulate matter
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MDPI and ACS Style

Jones, M.P.; Storm, M.; York, A.P.E.; Hyde, T.I.; Hatton, G.D.; Greenaway, A.G.; Haigh, S.J.; Eastwood, D.S. 4D In-Situ Microscopy of Aerosol Filtration in a Wall Flow Filter. Materials 2020, 13, 5676. https://doi.org/10.3390/ma13245676

AMA Style

Jones MP, Storm M, York APE, Hyde TI, Hatton GD, Greenaway AG, Haigh SJ, Eastwood DS. 4D In-Situ Microscopy of Aerosol Filtration in a Wall Flow Filter. Materials. 2020; 13(24):5676. https://doi.org/10.3390/ma13245676

Chicago/Turabian Style

Jones, Matthew P., Malte Storm, Andrew P.E. York, Timothy I. Hyde, Gareth D. Hatton, Alex G. Greenaway, Sarah J. Haigh, and David S. Eastwood. 2020. "4D In-Situ Microscopy of Aerosol Filtration in a Wall Flow Filter" Materials 13, no. 24: 5676. https://doi.org/10.3390/ma13245676

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