Skip to Main Content
Frequently Asked Questions
Submit an ETD
Global Search Box
Need Help?
Keyword Search
Participating Institutions
Advanced Search
School Logo
Files
File List
Thesis_Dennis_Lennaerts.pdf (4.86 MB)
ETD Abstract Container
Abstract Header
Effect of sample history on dissolution rates of gypsum {010} surfaces
Author Info
Lennaerts, Dennis Stefan Renier
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=wright1366826120
Abstract Details
Year and Degree
2013, Master of Science (MS), Wright State University, Chemistry.
Abstract
Mineral dissolution plays a significant role in geochemical processes such as carbon sequestration and isotope geochemistry. While factors such as temperature, pressure, and solution chemistry have been widely studied, the effects of sample history and surface morphology on dissolution rates have been studied to a lesser extent. This research focuses on the dissolution of cleaved, polished, and reacted samples of the atomically flat natural {010} cleavage plane of gypsum (CaSO4·2H2O) to further investigate upon the effect of sample history. Gypsum was chosen as the mineral of interest because of its planar crystal surface and relatively fast dissolution rate. Chemical dissolution rates as well as changes in surface morphologies were determined for cleaved, polished, and reacted crystals exposed to undersaturated solutions in continuously stirred, free–drift, batch reactors. Results from chemical rate determination showed a history effect as dissolution rate decreased in consecutive dissolution runs for polished samples. For cleaved samples, relatively slow initial dissolution rates were observed. Surface morphology development showed that cleaved samples initially dissolved through etch pit nucleation and growth, while polished samples initially dissolved through step retreat. After dissolution, both cleaved and polished surfaces only showed step bunches along the [001] direction suggesting that both cleaved and polished crystals will eventually have similar surface morphologies and dissolution rates. In conclusion, surface morphology and thus sample preparation affect the initial dissolution rates on the (010) surface of gypsum. Therefore, sample preparation is a variable that should be accounted for in laboratory experiments.
Committee
Steven R. Higgins, Ph.D (Advisor)
David A. Grossie, Ph.D (Committee Chair)
Andrew G. Stack, Ph.D (Committee Member)
David A. Dolson, Ph.D (Committee Member)
Ioana E.P. Sizemore, Ph.D (Committee Member)
Pages
68 p.
Subject Headings
Chemistry
;
Geochemistry
;
Geology
;
Mineralogy
Keywords
gypsum
;
mineral dissolution
;
surface morphology
;
sample history
;
atomic force microscopy
;
Recommended Citations
Refworks
EndNote
RIS
Mendeley
Citations
Lennaerts, D. S. R. (2013).
Effect of sample history on dissolution rates of gypsum {010} surfaces
[Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1366826120
APA Style (7th edition)
Lennaerts, Dennis.
Effect of sample history on dissolution rates of gypsum {010} surfaces.
2013. Wright State University, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=wright1366826120.
MLA Style (8th edition)
Lennaerts, Dennis. "Effect of sample history on dissolution rates of gypsum {010} surfaces." Master's thesis, Wright State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1366826120
Chicago Manual of Style (17th edition)
Abstract Footer
Document number:
wright1366826120
Download Count:
502
Copyright Info
© 2013, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.