(Hydroxy)apatite on cement: insights into a new surface treatment

Turner, Ronald J., Bots, Pieter, Richardson, Alan, Bingham, Paul A., Scrimshire, Alex, Brown, Andrew, S’Ari, Mark, Harrington, John, Cumberland, Susan A., Renshaw, Joanna C., Baker, Matthew J., Edwards, Paul R., Jenkins, Cerys and Hamilton, Andrea (2021) (Hydroxy)apatite on cement: insights into a new surface treatment. Materials Advances, 2 (19). pp. 6356-6368. ISSN 2633-5409

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Official URL: https://doi.org/10.1039/d1ma00320h


(Hydroxy)apatite (HAp) [Ca10(PO4)6(OH)2], has emerging potential as a cement coating material, with applications in environmental remediation, nuclear waste storage and architectural preservation. In these low temperature environments and when precipitating from aqueous solution on to a porous substrate, the crystal size, nucleation sites and modified surface properties created are key to designing the most effective coating. In this study we show that bacterial (biogenic) or chemical (abiotic) syntheses on to Portland cement alter these critical performance parameters. We identify that the most significant difference between these two methods is the rate of pH change of the solution during synthesis, as this alters the surface properties and layer structure of HAp formed on cement. We show that iron present in Portland cement is not incorporated into the HAp structure; that formation of nanoparticulate/nanocrystalline HAp begins in the top 20–50 μm of the cement pore structure; and that a slow pH rise in the deposition solution controlled by bacteria metabolic activity leads to a rougher and more hydrophilic HAp coating compared to the abiotic synthesis. The results present the possibility of tailoring the surface topography and hydrophilicity of (hydroxy)apatite coated cement.

Item Type: Article
Additional Information: Funding information: The authors gratefully acknowledge the Engineering and Physical Sciences Research Council (UKRI-EPSRC) for funding the research as a Doctoral Training Partnership. We acknowledge support from the Leeds spoke of the Henry Royce Institute, the UK's national body for advanced materials research and innovation, which enabled external access to FIB sample preparation and transmission electron microscopy in LEMAS, Leeds Electron Microscopy And Spectroscopy centre. Thanks to Dr Tanya Peshkur and Mara Knapp for their assistance with the microwave digestion and ICP-OES analyses and Dr Bart Craenen for assistance with statistics.
Subjects: H200 Civil Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 17 Sep 2021 08:51
Last Modified: 05 Oct 2021 15:45
URI: http://nrl.northumbria.ac.uk/id/eprint/47235

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