Copolymer polyelectrolyte adsorption onto titanium dioxide

Dispersion of nanosized aqueous suspensions of barium titanate with ammonium polyacrylate

“…We have also found that our values of Γ 0 are higher than those obtained by Jean and Wang [13] for PAA-NH 4 on microsized BaTiO 3 and similar to those obtained by Pina et al [28] for hydrolyzed styrene maleic anhydride (hSMA) on nanosized TiO 2 . The adsorption of polyelectrolyte onto ceramic powders can be influenced by many factors, such as the surface characteristics of powders, the properties of polyelectrolyte [29] (i.e., the dissociation degree, the number of carboxylic binding groups on the chain, the molecular weight), and the solvent properties.…”

Polyelectrolytes in Solution and the Stabilization of Colloids

“…When colloid is in excess, the establishment of an interfacial layer occurs instantaneously, while in the second process (interparticle bridging) it corresponds to the increase in the covering of the surface during aggregation. Pina and coworkers [60] observed that the adsorption of hydrolyzed poly(maleic anhydride-co-styrene) on titanium dioxide at basic pH occurred by electrostatic and nonelectrostatic interactions (hydrogen bonding) between solid and polymer, as well as hydrophobic interactions between nonpolar groups from the adsorbed polyelectrolyte, highly dependent on the ionic force. [58] Electrosteric stabilization requires the adsorption of charged polyelectrolytes; it has the advantage of providing an electrical double layer of repulsive forces as well as a steric barrier.…”

Adsorption of poly(acrylic acid) onto the surface of titanium dioxide and the colloidal stability of aqueous suspension

“…Wide application possibilities for the stabilizing and flocculating properties of polyelectrolytes are the reason for great interest in the adsorption of macromolecules [1][2][3][4][5]. The adsorption of polyelectrolytes onto the surfaces of solids depends notably on the pH of the solution, the ionic strength, and the surface charge of solids, as well as the character and charge of the adsorbent [6,7].…”