Microbial Biomineralization of Alkaline Earth Metal Carbonates on 3D-Printed Surfaces

Filipe Natalio, Raquel Maria

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The biomineralizing bacterium Sporosarcina pasteurii has attracted considerable interest in the area of geotechnical engineering due to its ability to induce extracellular mineralization. The presented study investigated S. pasteurii’s potential to induce the mineralization of alkali-earth metal carbonate coatings on different polymeric 3D-printed flat surfaces fabricated by different additive manufacturing methods. The use of calcium, barium, strontium, or magnesium ions as the source resulted in the formation of vaterite (CaCO3), witherite (BaCO3), strontianite (SrCO3), and nesquehonite MgCO3·3H2O, respectively. These mineral coatings generally exhibit a compact, yet variable, thickness and are composed of agglomerated microparticles similar to those formed in solution. However, the mechanism behind this clustering remains unclear. The thermal properties of these biologically induced mineral coatings differ from their inorganic counterpart, highlighting the unique characteristics imparted by the biomineralization process. This work seeks to capitalize on the bacterium S. pasteurii’s ability to form an alkali-earth metal carbonate coating to expand beyond its traditional use in geoengineering applications. It lays the ground for a novel integration of biologically induced mineralization of single or multilayered and multifunctional coating materials, for example, aerospace applications.

Original languageEnglish
Pages (from-to)6327-6336
Number of pages10
JournalACS Applied Materials and Interfaces
Volume16
Issue number5
DOIs
StatePublished - 7 Feb 2024

Keywords

  • 3D printing
  • alkali earth metal
  • bacteria
  • biomineralization
  • coatings

ASJC Scopus subject areas

  • General Materials Science

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