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Experimental Studies of Barite Growth Using Hydrothermal Atomic Force Microscopy in Alkali Metal Salt Solutions at 108 C

Ahmed, Sohan
http://rave.ohiolink.edu/etdc/view?acc_num=wright1567186567015893

Abstract Details

2019, Master of Science (MS), Wright State University, Chemistry.
Barite (BaSO4) growth on the (001) surface was studied under solutions of alkali metal chloride salts (LiCl, NaCl, KCl, RbCl and CsCl) as a function of saturation index and ionic strength of the salts at 108 C. When LiCl was used as the background electrolyte, growth hillocks on the barite surface consisted of both [010] steps and <120> steps at ionic strengths of 0.05 and 0.1 M, but [010] steps were not observed at lower ionic strength. In NaCl solutions, hillocks displayed greater prominence of the [010] steps when compared with LiCl. From the saturation state dependent studies, it was found that the kinetic coefficient for step growth increased by 200% when ionic strength increased from 0.01 M LiCl to 0.1 M LiCl. When KCl was used as the background electrolyte, conversion from a surface dominated by <120> steps to a surface consisting primarily of [010] steps was observed, however, a thorough explanation for this phenomenon was hampered by changes in the surface – tip interaction which led to poorly resolved surface features. When RbCl or CsCl was used as the background electrolyte, the growth of hillocks was partially or completely inhibited. The larger cations thus may behave as impurities whose interactions with the kink sites serve to block attachment of barium ions to sulfate-terminated kink sites.
Steven Higgins, Ph.D. (Advisor)
David Dolson, Ph.D. (Committee Member)
Ioana Pavel, Ph.D. (Committee Member)
55 p.
Analytical Chemistry; Chemistry
Barite growth; alkali metal chloride salts

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Citations

  • Ahmed, S. (2019). Experimental Studies of Barite Growth Using Hydrothermal Atomic Force Microscopy in Alkali Metal Salt Solutions at 108 C [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1567186567015893

    APA Style (7th edition)

  • Ahmed, Sohan. Experimental Studies of Barite Growth Using Hydrothermal Atomic Force Microscopy in Alkali Metal Salt Solutions at 108 C . 2019. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1567186567015893.

    MLA Style (8th edition)

  • Ahmed, Sohan. "Experimental Studies of Barite Growth Using Hydrothermal Atomic Force Microscopy in Alkali Metal Salt Solutions at 108 C ." Master's thesis, Wright State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1567186567015893

    Chicago Manual of Style (17th edition)

wright1567186567015893
133
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This open access ETD is published by Wright State University and OhioLINK.