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

Liu CZ, Lin CH, Yeh MS, Chao YM, Shen P - Nanoscale Res Lett (2010)

Bottom Line: Calcite were found to form faceted nanoparticles having 3x (01̄14) commensurate superstructure and with well-developed {112̄0} and {101̄4} surfaces to exhibit preferred orientations.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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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 (01̄14) commensurate superstructure and with well-developed {112̄0} and {101̄4} surfaces to exhibit preferred orientations. Aragonite occurred as laths having 3x (01̄1) commensurate superstructure and with well-developed (01̄1) 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.

No MeSH data available.


TEM a BFI, b SAED pattern (Z = [011]) of submicron-sized and twinned magnetite bicrystals with well-developed (011) face in top view and {111} as well as (100) facets edge on. Scale sample on the steel pipe subjected to MWT under 400 G at pipe center, 0.2 s/cycle, and with an electric ground to the Earth
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Figure 4: TEM a BFI, b SAED pattern (Z = [011]) of submicron-sized and twinned magnetite bicrystals with well-developed (011) face in top view and {111} as well as (100) facets edge on. Scale sample on the steel pipe subjected to MWT under 400 G at pipe center, 0.2 s/cycle, and with an electric ground to the Earth

Mentions: TEM BFI observation coupled with SAED pattern and EDX analyses of the powdery sample retrieved from the deposit on the steel pipe indicated that the magnetite and aragonite particles are much larger in size than the calcite nanoparticles. The submicron-sized magnetite particles were found to have well-developed () surface with minor {111} facets for the sample subject to MWT (Fig. 3) and that without an applied magnetic field (not shown) [[17]]. Occasionally, the magnetite particle formed twinned bicrystals with {111} twin plane and facets parallel to (100) besides {111} and much better developed {011} (Fig. 4).


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

Liu CZ, Lin CH, Yeh MS, Chao YM, Shen P - Nanoscale Res Lett (2010)

TEM a BFI, b SAED pattern (Z = [011]) of submicron-sized and twinned magnetite bicrystals with well-developed (011) face in top view and {111} as well as (100) facets edge on. Scale sample on the steel pipe subjected to MWT under 400 G at pipe center, 0.2 s/cycle, and with an electric ground to the Earth
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Related In: Results  -  Collection

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Figure 4: TEM a BFI, b SAED pattern (Z = [011]) of submicron-sized and twinned magnetite bicrystals with well-developed (011) face in top view and {111} as well as (100) facets edge on. Scale sample on the steel pipe subjected to MWT under 400 G at pipe center, 0.2 s/cycle, and with an electric ground to the Earth
Mentions: TEM BFI observation coupled with SAED pattern and EDX analyses of the powdery sample retrieved from the deposit on the steel pipe indicated that the magnetite and aragonite particles are much larger in size than the calcite nanoparticles. The submicron-sized magnetite particles were found to have well-developed () surface with minor {111} facets for the sample subject to MWT (Fig. 3) and that without an applied magnetic field (not shown) [[17]]. Occasionally, the magnetite particle formed twinned bicrystals with {111} twin plane and facets parallel to (100) besides {111} and much better developed {011} (Fig. 4).

Bottom Line: Calcite were found to form faceted nanoparticles having 3x (01̄14) commensurate superstructure and with well-developed {112̄0} and {101̄4} surfaces to exhibit preferred orientations.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.

View Article: PubMed Central - HTML - PubMed

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 (01̄14) commensurate superstructure and with well-developed {112̄0} and {101̄4} surfaces to exhibit preferred orientations. Aragonite occurred as laths having 3x (01̄1) commensurate superstructure and with well-developed (01̄1) 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.

No MeSH data available.