Cyclic carbonate–sodium smectite intercalates

Gates, Will P., Shaheen, Uzma, Turney, Terence W. and Patti, Antonio F. 2016, Cyclic carbonate–sodium smectite intercalates, Applied clay science, vol. 124-125, pp. 94-101, doi: 10.1016/j.clay.2016.02.005.

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Title Cyclic carbonate–sodium smectite intercalates
Author(s) Gates, Will P.ORCID iD for Gates, Will P.
Shaheen, Uzma
Turney, Terence W.
Patti, Antonio F.
Journal name Applied clay science
Volume number 124-125
Start page 94
End page 101
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-05
ISSN 0169-1317
Keyword(s) salinity barriers
glycerol carbonate
polar aprotic solvents
crystalline swelling
interlayer structure
Summary Five-membered cyclic organic carbonates (COC) are of interest for their ability to modify the surface properties of smectites and enhance the hydraulic resistance of bentonites to saline leachates. The mechanism of interaction of glycerol carbonate (GC) and several other hydroxyl containing cyclic organic carbonates (generally having progressively greater molecular masses) with sodium montmorillonite (Na+-Mt) was studied using powder X-ray diffraction and infrared spectroscopy. The 001 reflection for GC/Na+-Mt intercalates varied with the amount COC added, and the measured d001 value increased from 1.29 nm to as large as 2.22 nm at equal-mass coverage of the COC to Na+-Mt. In general, when intercalated, the cyclic carbonyl (Cdouble bond; length as m-dashO) stretch and the fundamental hydroxyl (O–H) stretch bands of COC derivatives were red-shifted with respect to these bands for neat COC, indicating strong ion-dipole interaction of the carbonyl group with interlayer Na+, and H-bonding of the OH group with both interlayer water and Mt surfaces. A stable and highly ordered intercalate was produced at a 1:1 mass loading with Mt in which about 6 GC molecules per unit cell (~ 7 molecules per Na+ ion) replaced most of the interlayer water.
Language eng
DOI 10.1016/j.clay.2016.02.005
Field of Research 090501 Civil Geotechnical Engineering
Socio Economic Objective 960908 Mining Land and Water Management
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID DP1095129
Copyright notice ©2016 Published by Elsevier B.V.
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