Abstract

Biotechnologies could supply inexpensive, environment friendly and effective materials for new nonstandard and concurrent solutions. The present work’s focus was on acquiring new physical data for application in electronics and medicine of biogenic materials obtained due to the metabolism in laboratory conditions of iron-oxidizing bacteria from the genus Leptothrix. Powders and coatings on glass samples were under investigation. XRD and Raman Spectroscopy analysis of the data collected show that the Fe²⁺-depending from the growth media could transformed into Fe³⁺ or Fe^2.5+ in the form of two types of oxides/hydroxides such as magnetite (Fe₃O₄) and lepidocrocite (ɣ-FeOOH), all with nanostructured morphology. Biotechnology for obtaining one biogenic iron phosphate hydroxide (ferrian giniite) – (Fe₅(PO₄)₄(OH)₃.2H₂O) was also developed. The ferrian magnetic material is dispersed in the walls of biogenic tubular structures.
The average particle’s size and crystalline structures of bio-products were investigated. Results based on PPMS measurements on the magnetic properties were reported. The new biogenic materials showed superparamagnetic behaviour and high sensitivity to electromagnetic radiation and have real potential for application in electronic and information technologies.