2017
DOI: 10.3390/min7080140
|View full text |Cite
|
Sign up to set email alerts
|

Physicochemical and Additive Controls on the Multistep Precipitation Pathway of Gypsum

Abstract: Synchrotron-based small-and wide-angle X-ray scattering (SAXS/WAXS) was used to examine in situ the precipitation of gypsum (CaSO 4 ·2H 2 O) from solution. We determined the role of (I) supersaturation, (II) temperature and (III) additives (Mg 2+ and citric acid) on the precipitation mechanism and rate of gypsum. Detailed analysis of the SAXS data showed that for all tested supersaturations and temperatures the same nucleation pathway was maintained, i.e., formation of primary particles that aggregate and tran… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1

Citation Types

3
37
2

Year Published

2018
2018
2023
2023

Publication Types

Select...
8

Relationship

0
8

Authors

Journals

citations
Cited by 28 publications
(42 citation statements)
references
References 30 publications
3
37
2
Order By: Relevance
“…Although our current diffraction and earlier scattering data 12,13 , as well as the current MD simulations, clearly point to the presence of small CaSO4 clusters as a precursor to gypsum and possibly other calcium sulfate crystalline phases 29 , it is not clear what their role exactly is.…”
Section: Discussioncontrasting
confidence: 61%
See 2 more Smart Citations
“…Although our current diffraction and earlier scattering data 12,13 , as well as the current MD simulations, clearly point to the presence of small CaSO4 clusters as a precursor to gypsum and possibly other calcium sulfate crystalline phases 29 , it is not clear what their role exactly is.…”
Section: Discussioncontrasting
confidence: 61%
“…We performed such analysis using diffraction data of gypsum precipitating at 10 ºC from solution containing initially 50 and 100 mM CaSO4. For both conditions, diffraction patterns of an identical nanophase profile were collected, but as expected, the crystallization process progressed faster for the higher initial CaSO4 concentration 13 . As shown in Fig.…”
Section: Resultsmentioning
confidence: 66%
See 1 more Smart Citation
“…Following the current consensus discussed above, we point out that this classification is solely based on their final structure, which essentially does not provide on its own a sufficient evidence for a non-classical, particle-mediated, growth mechanism 41,42 . However, in our previous work based on scattering experiments and theory [1][2][3]43 , we showed that the formation of calcium sulfate phases occurs through the coalescence and growth of primary particles within surface fractal aggregates ("brick-in-awall") 3 . We postulated that this initial step involved a framework structure as a plausible common precursor to gypsum, bassanite and anhydrite 1,2 .…”
Section: Mechanisms Implications and Outlookmentioning
confidence: 99%
“…Gruber et al [13] present a transparent, inexpensive, and reusable test system for the investigation of infiltration and crystallization processes by using a micro-comb test system. Ossorio et al [14] perform synchrotron-based small-and wide-angle X-ray scattering to examine the precipitation of gypsum from solution, which occur via primary particles that aggregate and transform/re-organize towards the final precipitate, with and without the addition of Mg 2+ and citrate. Self-assembly processes of alkaline earth carbonates in the presence of silica, on the other hand, produce a unique class of composite materials with complex morphologies, as studied by Opel et al [15] (also see the cover page of this Minerals special issue).…”
mentioning
confidence: 99%