Journal
LANGMUIR
Volume 32, Issue 21, Pages 5233-5240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.6b00462
Keywords
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Funding
- U.S. National Science Foundation
- MRSEC [NSF DMR-08-20404, NSF DMR-1420620]
- NSF [CBET 1350647]
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Pseudomorphic mineral replacement reactions involve one mineral phase replacing another, while preserving the original mineral's size and texture. Macroscopically, these transformations are driven by system-wide equilibration through dissolution and precipitation reactions. It is unclear, however, how replacement occurs on the molecular scale and what role dissolved ion transport plays. Here, we develop a new quantitative framework to explain the pseudomorphic replacement of KBr crystal in a saturated KCl solution through a combination of microscopic, spectroscopic, and modeling techniques. Our observations reveal that pseudomorphic mineral replacement (pMRR) is transport-controlled for this system and that convective fluid flows, caused by diffusioosmosis, play a key role in the ion transport process across the reaction-induced pores in the product phase. Our findings have important implications for understanding mineral transformations in natural environments and suggest that replacement could be exploited in commercial and laboratory applications.
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