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Surface Modification and Planar Defects of Calcium Carbonates by Magnetic Water Treatment

Author(s): Liu CZ | Lin CH | Yeh MS | Chao YM | Shen P

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 5;
Issue: 12;
Start page: 1982;
Date: 2010;
Original page

Keywords: Calcium carbonate | Nanoparticle | Magnetic water treatment | Surface modification | Superstructure | TEM

Abstract Powdery calcium carbonates, predominantly calcite and aragonite, with planar defects and cation–anion mixed surfaces as deposited on low-carbon steel by magnetic water treatment (MWT) were characterized by X-ray diffraction, electron microscopy, and vibration spectroscopy. Calcite were found to form faceted nanoparticles having 3x ( ) commensurate superstructure and with well-developed { } and { } surfaces to exhibit preferred orientations. Aragonite occurred as laths having 3x ( ) commensurate superstructure and with well-developed ( ) surface extending along [100] direction up to micrometers in length. The (hkil)-specific coalescence of calcite and rapid lath growth of aragonite under the combined effects of Lorentz force and a precondensation event account for a beneficial larger particulate/colony size for the removal of the carbonate scale from the steel substrate. The coexisting magnetite particles have well-developed {011} surfaces regardless of MWT.
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