Zeta Potential of Nanosilica in 50% Aqueous Ethylene Glycol and in 50% Aqueous Propylene Glycol

Abstract

A sufficient amount of ionic surfactants may induce a zeta potential of silica particles dispersed in water–glycol mixtures of about 100 mV in absolute value. Nanoparticles of silica were dispersed in 50-50 ethylene glycol (EG)–water and 50-50 propylene glycol (PG)–water mixtures, and the zeta potential was studied as a function of acid, base, and surfactant concentrations. The addition of HCl had a limited effect on the zeta potential. The addition of NaOH in excess of 10−5 M induced a zeta potential of about −80 mV in 50% EG, but in 50% PG the effect of NaOH was less significant. The addition of CTMABr in excess of 10−3 M induced a zeta potential of about +100 mV in 50% EG and in 50% PG. The addition of SDS in excess of 10−3 M induced a zeta potential of about −80 mV in 50% EG and in 50% PG. Long-chained analogs of SDS were even more efficient than SDS, but their application is limited by their low solubility in aqueous glycols.

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“…A standard method for determining the surface charge of micro/nanomaterials, based on the basic concepts of suspension stability, is the evaluation of zeta potential using the Zetasizer Nano-ZSP instrument. Zeta potential measures the degree of relative repulsion among colloidal particles and employs this information to determine the stability of a colloidal suspension [ 98 ]. This dynamic light scattering technique measured the approximate size of SPNFC particles and shows that SPNFC displayed notably negative zeta potential values (mV), with an average measurement of −32.1.…”