2012
DOI: 10.1126/science.1215648
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The Role and Implications of Bassanite as a Stable Precursor Phase to Gypsum Precipitation

Abstract: Calcium sulfate minerals such as gypsum play important roles in natural and industrial processes, but their precipitation mechanisms remain largely unexplored. We used time-resolved sample quenching and high-resolution microscopy to demonstrate that gypsum forms via a three-stage process: (i) homogeneous precipitation of nanocrystalline hemihydrate bassanite below its predicted solubility, (ii) self-assembly of bassanite into elongated aggregates co-oriented along their c axis, and (iii) transformation into di… Show more

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Cited by 311 publications
(362 citation statements)
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References 32 publications
(65 reference statements)
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“…16 As these particles are not isolated from the solution, the stabilization of these metastable polymorphs cannot be attributed to the absence of water. Instead, we proposed that the aggregation-based transformation of the metastable polymorph hemihydrate to gypsum 53,54 would be affected by the restricted volume. 16 The diffusive transport of particles is severely hindered when the surface separation approaches the particle diameter such that aggregation would be slower or not occur to the same extent in confinement.…”
Section: Discussionmentioning
confidence: 99%
“…16 As these particles are not isolated from the solution, the stabilization of these metastable polymorphs cannot be attributed to the absence of water. Instead, we proposed that the aggregation-based transformation of the metastable polymorph hemihydrate to gypsum 53,54 would be affected by the restricted volume. 16 The diffusive transport of particles is severely hindered when the surface separation approaches the particle diameter such that aggregation would be slower or not occur to the same extent in confinement.…”
Section: Discussionmentioning
confidence: 99%
“…But, new experimental evidence has revealed that gypsum precipitation does not proceed via a direct nucleation pathway. Instead, a variety of multi-step pathways have been proposed including amorphous calcium sulphate and bassanite as possible precursor phases [7][8][9][10]. However, all these studies are mainly based on ex situ characterization of the precipitation reaction (e.g., electron microscopic imaging combined with quenching techniques to isolate the precipitates from solution for their subsequent characterization).…”
Section: Introductionmentioning
confidence: 99%
“…The two likely candidates are the aqueous phase in the parasite digestive vacuole (DV) 17,18 and the lipid subphase that has been reported to reside either in the DV bulk 19,20 or along the DV membrane 17,21 . The mechanism of hematin crystallization may be classical, i.e., addition of molecules to growth sites 22 , or nonclassical, i.e., association of precursors [23][24][25] . The mechanism of action of the inhibitor species, it is possible that the inhibitors either reduce the concentration and activity of hematin in the growth medium through complexation 26,27 , or interfere with crystallization by binding to the crystal surface(s) and restricting solute addition.…”
Section: Introductionmentioning
confidence: 99%