2014/06/21 by Shweta Jatav, Yogesh M. Joshi, Yogesh M Joshi
Chemistry · Earth and Planetary Sciences · Environmental Science · Physics and Astronomy · #Aqueous solution #Chemical engineering #Chemistry #Dispersion (optics) #Dispersion stability #Dissolution #Electrostatics and Colloid Interactions #Geophysical and Geoelectrical Methods #Inorganic chemistry #Ion #Ionic bonding #Materials science #Minerals Flotation and Separation Techniques #Organic chemistry #Polymer #Solvent #cond-mat.mtrl-sci #cond-mat.soft
paper · pdf · doi:10.1016/j.clay.2014.06.004
published as Applied Clay Science, 97, 72 (2014) · 21 pages, 5 figures
openalex publication_date 2014/06/21 · arxiv created 2014/07/06 · arxiv updated 2014/07/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this work stability of Laponite against dissolution in its aqueous dispersions is investigated as a function of initial pH of water before mixing Laponite, and concentration of Laponite. Dissolution of Laponite is quantified in terms of concentration of leached magnesium in the dispersions. Interestingly the solvent pH is observed to play no role in dissolution of Laponite in dispersion over the explored range of 3 to 10. Furthermore, contrary to the usual belief that Laponite dissolves when pH of aqueous dispersion decreases below 9, dissolution of the same is observed even though dispersion pH is above 10 for low concentrations of Laponite (1 and 1.7 mass%). On the other hand, for dispersions having high concentration of Laponite (2.8 mass%) and pH in the similar range (>10) no dissolution is observed. Measurement of ionic conductivity of dispersion shows that concentration of sodium ions in dispersion increases with concentration of Laponite, which appears to have a role in preventing the dissolution of Laponite.