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09:31
Calcium Carbonate Formation in the Presence of Biopolymeric Additives
Published on: May 14, 2019
Interactions in Calcium Oxalate Hydrate/Surfactant Systems
Sikiric1, Filipovic-Vincekovic, Babic-Ivanci&cacute
1Faculty of Agriculture, Ruder Boskovic Institute, Zagreb, 10001, Croatia
Journal of Colloid and Interface Science
|March 27, 1999
Summary
Both sodium dodecyl sulfate (SDS) and dodecylammonium chloride surfactants inhibit calcium oxalate dihydrate (COD) to calcium oxalate monohydrate (COM) transformation by adsorbing onto crystal faces. SDS is a more effective inhibitor, influencing crystal growth.
Area of Science:
- Crystallization and Solid-State Chemistry
- Surface Chemistry and Interfacial Phenomena
Background:
- Calcium oxalate dihydrate (COD) transforms into the more stable calcium oxalate monohydrate (COM).
- Surfactants can influence phase transformations and crystal habit.
- Understanding these interactions is crucial for controlling mineral formation.
Purpose of the Study:
- To investigate the phase transformation of COD to COM in the presence of anionic (sodium dodecyl sulfate, SDS) and cationic (dodecylammonium chloride) surfactants.
- To determine the inhibitory effects of these surfactants on the transformation process.
- To analyze the adsorption behavior of surfactants at the solid/liquid interface.
Main Methods:
- Studied the phase transformation of COD to COM in aqueous solutions containing SDS and dodecylammonium chloride.
- Analyzed the adsorption isotherms of both surfactants at the solid/liquid interface.
- Investigated the preferential adsorption of surfactants on different crystal faces.
Main Results:
- Both SDS and dodecylammonium chloride inhibit the COD to COM transformation but do not completely halt it.
- Surfactants adsorb preferentially on different crystal faces, affecting crystal morphology.
- SDS demonstrates a stronger inhibitory effect compared to dodecylammonium chloride.
- Adsorption isotherms for both surfactants exhibit a two-plateau characteristic, with variations attributed to surface interactions.
Conclusions:
- Surfactant adsorption at specific crystal faces is the mechanism for inhibiting COD to COM phase transformation.
- Differences in surfactant structure and crystal surface properties lead to distinct adsorption behaviors and inhibition efficiencies.
- SDS is a more potent inhibitor due to its specific interactions with the crystal surface.
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