CUED Publications database

Characterisation of CaCO<inf>3</inf> phases during strain-specific ureolytic precipitation

Clarà Saracho, A and Haigh, SK and Hata, T and Soga, K and Farsang, S and Redfern, SAT and Marek, E (2020) Characterisation of CaCO<inf>3</inf> phases during strain-specific ureolytic precipitation. Scientific Reports, 10.

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Abstract

© 2020, The Author(s). Numerous microbial species can selectively precipitate mineral carbonates with enhanced mechanical properties, however, understanding exactly how they achieve this control represents a major challenge in the field of biomineralisation. We have studied microbial induced calcium carbonate (CaCO3) precipitation (MICP) in three ureolytic bacterial strains from the Sporosarcina family, including S. newyorkensis, a newly isolated microbe from the deep sea. We find that the interplay between structural water and strain-specific amino acid groups is fundamental to the stabilisation of vaterite and that, under the same conditions, different isolates yield distinctly different polymorphs. The latter is found to be associated with different urease activities and, consequently, precipitation kinetics, which change depending on pressure-temperature conditions. Further, CaCO3 polymorph selection also depends on the coupled effect of chemical treatment and initial bacterial concentrations. Our findings provide new insights into strain-specific CaCO3 polymorphic selection and stabilisation, and open up promising avenues for designing bio-reinforced geo-materials that capitalise on the different particle bond mechanical properties offered by different polymorphs.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 22 May 2020 21:09
Last Modified: 27 Oct 2020 06:31
DOI: 10.1038/s41598-020-66831-y