Charging of Latex Particles Stabilized by Sulfate Surfactant

Abstract

Surface charging of polystyrene latex particles stabilized with sodium dodecyl sulfate (SDS) was investigated. The surfactant adsorption isotherm and electrophoretic mobilities of monodisperse latex particles were measured. Electrophoretic mobility measurements at moderate ionic strengths (around 0.1 M) indicated a substantial degree of counterion binding to adsorbed dodecyl sulfate anions, comparable to that found in SDS micelles. We offer a consistent description of surface charging of SDS-stabilized latex particles and SDS micelles taking into account binding of sodium counterions to dodecyl sulfate anions.

Electrokinetic behavior and colloidal stability of polystyrene latex coated with ionic surfactants

“…[6]), however, the increase in mobility is not so sharp. This could be explained again by counterion condensation [11,12].…”

“…As the theoretical number of charged groups necessary to cancel the surface charge is 1.44 µmol/m 2 , the electrostatic binding at low surfactant concentrations was not 1:1. Therefore, the adsorption of other components of the solution (probably ions) could take place [11,12]. The fact that the mobility at the intermediate plateau was negative, explains that the adsorption of new negative chains is hindered in this region due to electrostatic repulsion between the adsorbed surfactants and those approaching from the solution.…”

Adsorption of sodium dodecyl sulfate and sodium dodecyl benzenesulfonate on poly(vinyl chloride) latexes

“…A number of authors have determined adsorption isotherms of (ionic and non-ionic) surfactants on polymer latexes, but the large majority of these studies have been done for polystyrene (PS) [4][5][6][7][8][9][10][11][12], given its widespread use as model colloid. Consequently, there is a clear need for data on other important systems, of which PVC is an example.…”

“…Sefcik et al [12] investigated the SDS-PS system by analyzing a small amount of filtrate, obtained through utrafiltration, via ion chromatography.…”

ZnO nanosphere fabrication using the functionalized polystyrene nanoparticles for dye-sensitized solar cells

“…1a) [16][17][18]. Styrene monomer (20 g), divinyl benzene as a cross-linker, surfactant sodium dodecyl sulfate (360 mg) and sodium tetraborate (0.85%, w/v) as a pH controller were added to 250 mL of distilled water in a 500 mL three-necked round-bottom flask that was heated to 70 • C. The pH of the solution was controlled by sodium tetraborate (Na 2 B 4 O 7 ) to maintain a basic condition.…”