Complexation of Ferric Oxide Particles with Pectins of Different Charge Density

Abstract

The effect of polyelectrolyte charge density on the electrical properties and stability of suspensions of oppositely charged oxide particles is followed by means of electro-optics and electrophoresis. Variations in the electro-optical effect and the electrophoretic mobility are examined at conditions where fully ionized pectins of different charge density adsorb onto particles with ionizable surfaces. The charge neutralization point coincides with the maximum of particle aggregation in all suspensions. We find that the concentration of polyelectrolyte, needed to neutralize the particle charge, decreases with increasing charge density of the pectin. The most highly charged pectin presents an exception to this order, which is explained with a reduction of the effective charge density of this pectin due to condensation of counterions. The presence of condensed counterions, remaining bound to the pectin during its adsorption on the particle surface, is proved by investigation of the frequency behavior of the electro-optical effect at charge reversal of the particle surface.

Self‐Assembly of Polyethylenimine‐Modified Biodegradable Complex Micelles as Gene Transfer Vector for Proliferation of Endothelial Cells

“…When mPEG/PEI mass ratio was same, the D h of DNA‐loaded micelles decreased gradually along with N/P molar ratio increased from 5 to 20. The aggregation of DNA‐loaded micelles was also observed in many polyelectrolyte colloid systems in previous studies . At N/P molar ratio of 20, the micellar surface was charged with high positive charge.…”

“…The aggregation of DNA-loaded micelles was also observed in many polyelectrolyte colloid systems in previous studies. [43][44][45] At N/P molar ratio of 20, the micellar surface was charged with high positive charge. The micelles repelled each other to avoid aggregation.…”

Influence of charge density and calcium salt on stiffness of polysaccharides multilayer film

“…2.2) [28] and that of the PEC/CHI film (ca. 1.4) [29]. By comparison of the electrical polarizability values for the films terminated with PEC and CHI, we determine the charge ratio in the PEC/CHI film to be ca.…”

Interaction between like-charged polyelectrolyte-colloid complexes in electrolyte solutions: A Monte Carlo simulation study in the Debye–Hückel approximation

“…This intriguing phenomenology has been observed in a variety of polyelectrolyte-colloid systems dispersed in aqueous solutions such as polyelectrolyte-micelle complexes, [20] latex particles [21,22], dendrimers [23], ferric oxide particles [24], phospholipid vesicles (liposomes) [25][26][27], 'hybrid niosome' vesicles [28].…”