Study of the dissolution of the barium sulfate (001) surface with hydrochloric acid by atomic force microscopy

Kang Shi Wang, Roland Resch, Bruce E. Koel, Patrick J. Shuler, Yongchun Tang, Huey jyh Chen, Teh Fu Yen

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Noncontact atomic force microscopy (NC-AFM) has been used to investigate the morphological changes of a freshly cleaved (001) surface of barium sulfate (barite) etched with an aqueous solution of 0.1 M HCl at room temperature. Shallow triangular etch pits with a height of 3.6 Å were developed in atomically flat (001) terraces. The etching of the surface was found to proceed in a layer-by-layer dissolution process. Because the crystal structure of barite exhibits a two-fold screw axis parallel to the c axis, 'alternating' etch pits were formed, with any two consecutive etch pits pointing opposite to each other. These etch pits became deeper and more elongated along the b axis with time.

Original languageEnglish (US)
Pages (from-to)212-215
Number of pages4
JournalJournal of Colloid And Interface Science
Volume219
Issue number1
DOIs
StatePublished - Nov 1 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Keywords

  • Atomic force microscopy
  • Barium sulfate
  • Dissolution
  • Etch pit
  • HCl

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