Modulation of soft glassy dynamics in aqueous suspensions of an anisotropic charged swelling clay through pH adjustment.

Abstract Hypothesis Sodium-montmorillonite (Na-Mt) particles are geometrically anisometric that carry a pH dependent anisotropic surface charge. Therefore, it should be possible to manipulate the particle–particle interaction of colloidal range Na-Mt suspensions through pH changes which in turn should alter the soft glassy dynamics of Na-Mt suspensions. Experiments Rheological experiments were used to probe the impact of pH mediated colloidal particle–particle interaction on the physical aging, linear viscoelastic response, and yield stress behavior of Na-Mt suspension. Findings The temporal evolution of the storage modulus (G') was stronger in the acid regime (pH