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Author Szcześ, Aleksandra ♦ Czemierska, Magdalena ♦ Jarosz-Wilkołazka, Anna
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ ATOMIC FORCE MICROSCOPY ♦ CALCIUM CARBONATES ♦ CALCIUM CHLORIDES ♦ CARBON ♦ CRYSTAL GROWTH ♦ MICA ♦ POLYMERIZATION ♦ POLYMERS ♦ RAMAN SPECTROSCOPY ♦ RHODOCOCCUS ♦ SCANNING ELECTRON MICROSCOPY ♦ X-RAY PHOTOELECTRON SPECTROSCOPY
Abstract Extracellular polymeric substance (EPS) extracted from Rhodococcus opacus bacterial strain was used as a matrix for calcium carbonate precipitation using the vapour diffusion method. The total exopolymer and water-soluble exopolymer fraction of different concentrations were spread on the mica surface by the spin-coating method. The obtained layers were characterized using the atomic force microscopy measurement and XPS analysis. The effects of polymer concentration, initial pH of calcium chloride solution and precipitation time on the obtained crystals properties were investigated. Raman spectroscopy and scanning electron microscopy were used to characterize the precipitated minerals. It was found that the type of precipitated CaCO{sub 3} polymorph and the crystal size depend on the kind of EPS fraction. The obtained results indicates that the water soluble fraction favours vaterite dissolution and calcite growth, whereas the total EPS stabilizes vaterite and this effect is stronger at basic pH. It seems to be due to different contents of the functional group of EPS fractions. - Highlights: • CaCO{sub 3} crystal size and polymorph can be controlled by EPS substance obtained from R. opacus. • The water soluble fraction favours vaterite dissolution and calcite growth. • The total EPS stabilizes vaterite. • This effect is stronger at basic pH.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-10-15
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 242
Part 1


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