Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot 76100, Israel.
Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel.
ACS Appl Mater Interfaces. 2024 Feb 7;16(5):6327-6336. doi: 10.1021/acsami.3c13665. Epub 2024 Jan 11.
The biomineralizing bacterium has attracted considerable interest in the area of geotechnical engineering due to its ability to induce extracellular mineralization. The presented study investigated '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 (CaCO), witherite (BaCO), strontianite (SrCO), and nesquehonite MgCO·3HO, 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 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.
具有在岩土工程领域引起广泛关注，因为它能够诱导细胞外矿化。本研究探讨了在不同的添加剂制造方法制造的不同聚合物 3D 打印平表面上诱导碱土金属碳酸盐涂层矿化的潜力。使用钙离子、钡离子、锶离子或镁离子作为源，分别形成了方解石（CaCO）、菱锶矿（BaCO）、天青石（SrCO）和水菱镁矿[MgCO·3HO]。这些矿化涂层通常具有致密但可变的厚度，并且由类似于在溶液中形成的团聚的微颗粒组成。然而，这种团聚的机制尚不清楚。这些生物诱导矿化涂层的热性质与它们的无机对应物不同，突出了生物矿化过程赋予的独特特征。这项工作旨在利用细菌形成碱土金属碳酸盐涂层的能力，将其应用扩展到传统的地质工程应用之外。它为单一或多层和多功能涂层材料的生物诱导矿化的新型整合奠定了基础，例如在航空航天应用中。
