Scanning force microscopy study of etch pits formed during dissolution of a barite (001) surface in CDTA and EDTA solutions

Kang Shi Wang, Roland Resch, Kai Dunn, Patrick Shuler, Yongchun Tang, Bruce E. Koel, Teh Fu Yen

Research output: Contribution to journalArticle

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Abstract

Dissolution of the barite (001) surface in aqueous solutions of 0.18 M CDTA (trans-1,2-cyclohexylene-diaminetetraacetic acid) and 0.18 M EDTA (ethylenediaminetetraacetic acid) at pH 12 was investigated using ex situ scanning force microscopy. In both solutions, triangular and trapezoidal etch pits developed on the (001) surface and became deeper and longer with increasing dissolution time. The orientation of the etch pits in CDTA and EDTA solutions was elongated along the crystallographic b axis. Furthermore, dissolution of the (001) surface in a layer-by-layer fashion was observed. This resulted in the formation of `alternating' etch pits with heights of one half-unit cell (about 3.6 angstroms), with the orientations of any two consecutive etch pits pointing oppositely to each other. In CDTA, etch pits within the half-unit cell were frequently bounded along the 〈120〉 and 〈010〉 directions. However, in EDTA, etch pits within the half-unit cell were bounded along the 〈110〉 and 〈010〉 directions. The dissolution behavior of barite in these two solutions is different based on the observed differences in the etch pits geometries as an assay for specific interactions between the crystal surface and organic molecules. Thus, we suggest that CDTA molecules bind to one Ba2+ cation along the 〈120〉 and/or 〈010〉 directions and EDTA molecules bind along the 〈110〉 directions to two Ba2+ cations exposed on the (001) surface.

Original languageEnglish (US)
Pages (from-to)649-655
Number of pages7
JournalLangmuir
Volume16
Issue number2
DOIs
StatePublished - Jan 25 2000

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Barium Sulfate
Edetic Acid
Atomic force microscopy
Dissolution
Acids
Molecules
Cations
Assays
Crystals
Geometry
Direction compound

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Materials Science(all)
  • Spectroscopy
  • Surfaces and Interfaces
  • Electrochemistry

Cite this

Wang, Kang Shi ; Resch, Roland ; Dunn, Kai ; Shuler, Patrick ; Tang, Yongchun ; Koel, Bruce E. ; Yen, Teh Fu. / Scanning force microscopy study of etch pits formed during dissolution of a barite (001) surface in CDTA and EDTA solutions. In: Langmuir. 2000 ; Vol. 16, No. 2. pp. 649-655.
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abstract = "Dissolution of the barite (001) surface in aqueous solutions of 0.18 M CDTA (trans-1,2-cyclohexylene-diaminetetraacetic acid) and 0.18 M EDTA (ethylenediaminetetraacetic acid) at pH 12 was investigated using ex situ scanning force microscopy. In both solutions, triangular and trapezoidal etch pits developed on the (001) surface and became deeper and longer with increasing dissolution time. The orientation of the etch pits in CDTA and EDTA solutions was elongated along the crystallographic b axis. Furthermore, dissolution of the (001) surface in a layer-by-layer fashion was observed. This resulted in the formation of `alternating' etch pits with heights of one half-unit cell (about 3.6 angstroms), with the orientations of any two consecutive etch pits pointing oppositely to each other. In CDTA, etch pits within the half-unit cell were frequently bounded along the 〈120〉 and 〈010〉 directions. However, in EDTA, etch pits within the half-unit cell were bounded along the 〈110〉 and 〈010〉 directions. The dissolution behavior of barite in these two solutions is different based on the observed differences in the etch pits geometries as an assay for specific interactions between the crystal surface and organic molecules. Thus, we suggest that CDTA molecules bind to one Ba2+ cation along the 〈120〉 and/or 〈010〉 directions and EDTA molecules bind along the 〈110〉 directions to two Ba2+ cations exposed on the (001) surface.",
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Scanning force microscopy study of etch pits formed during dissolution of a barite (001) surface in CDTA and EDTA solutions. / Wang, Kang Shi; Resch, Roland; Dunn, Kai; Shuler, Patrick; Tang, Yongchun; Koel, Bruce E.; Yen, Teh Fu.

In: Langmuir, Vol. 16, No. 2, 25.01.2000, p. 649-655.

Research output: Contribution to journalArticle

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T1 - Scanning force microscopy study of etch pits formed during dissolution of a barite (001) surface in CDTA and EDTA solutions

AU - Wang, Kang Shi

AU - Resch, Roland

AU - Dunn, Kai

AU - Shuler, Patrick

AU - Tang, Yongchun

AU - Koel, Bruce E.

AU - Yen, Teh Fu

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N2 - Dissolution of the barite (001) surface in aqueous solutions of 0.18 M CDTA (trans-1,2-cyclohexylene-diaminetetraacetic acid) and 0.18 M EDTA (ethylenediaminetetraacetic acid) at pH 12 was investigated using ex situ scanning force microscopy. In both solutions, triangular and trapezoidal etch pits developed on the (001) surface and became deeper and longer with increasing dissolution time. The orientation of the etch pits in CDTA and EDTA solutions was elongated along the crystallographic b axis. Furthermore, dissolution of the (001) surface in a layer-by-layer fashion was observed. This resulted in the formation of `alternating' etch pits with heights of one half-unit cell (about 3.6 angstroms), with the orientations of any two consecutive etch pits pointing oppositely to each other. In CDTA, etch pits within the half-unit cell were frequently bounded along the 〈120〉 and 〈010〉 directions. However, in EDTA, etch pits within the half-unit cell were bounded along the 〈110〉 and 〈010〉 directions. The dissolution behavior of barite in these two solutions is different based on the observed differences in the etch pits geometries as an assay for specific interactions between the crystal surface and organic molecules. Thus, we suggest that CDTA molecules bind to one Ba2+ cation along the 〈120〉 and/or 〈010〉 directions and EDTA molecules bind along the 〈110〉 directions to two Ba2+ cations exposed on the (001) surface.

AB - Dissolution of the barite (001) surface in aqueous solutions of 0.18 M CDTA (trans-1,2-cyclohexylene-diaminetetraacetic acid) and 0.18 M EDTA (ethylenediaminetetraacetic acid) at pH 12 was investigated using ex situ scanning force microscopy. In both solutions, triangular and trapezoidal etch pits developed on the (001) surface and became deeper and longer with increasing dissolution time. The orientation of the etch pits in CDTA and EDTA solutions was elongated along the crystallographic b axis. Furthermore, dissolution of the (001) surface in a layer-by-layer fashion was observed. This resulted in the formation of `alternating' etch pits with heights of one half-unit cell (about 3.6 angstroms), with the orientations of any two consecutive etch pits pointing oppositely to each other. In CDTA, etch pits within the half-unit cell were frequently bounded along the 〈120〉 and 〈010〉 directions. However, in EDTA, etch pits within the half-unit cell were bounded along the 〈110〉 and 〈010〉 directions. The dissolution behavior of barite in these two solutions is different based on the observed differences in the etch pits geometries as an assay for specific interactions between the crystal surface and organic molecules. Thus, we suggest that CDTA molecules bind to one Ba2+ cation along the 〈120〉 and/or 〈010〉 directions and EDTA molecules bind along the 〈110〉 directions to two Ba2+ cations exposed on the (001) surface.

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