Abstract
Surface morphology of bentonites and their Ca2+ and Na+ modifications were observed with scanning electron microscope (SEM).
Our observation indicated that the Ca-montmorillonite surface is rugged, whereas the Na-montmorillonite surface is relatively smooth and curly.
The above difference in surface morphology is considered to be due to the difference in kind and amount of the exchangeable cation.
The DTA-TG curves of these specimens are also presented.
