Electric Properties and Conformation of Polyethylenimine at the Hematite–Aqueous Solution Interface

Adsorption of Polyethylenimine on Nanosized Zirconia Particles in Aqueous Suspensions

“…Lowering the pH causes the molecules to become increasingly positively charged, which causes expansion owing to internal repulsion between charged sites (5). The cationic polyelectrolyte adsorbs onto negatively charged particles such as SiO 2 , SiC (6), and Fe 2 O 3 (7). The adsorption isotherms for the PEI-silica system are of the high affinity type and at low PEI adsorption, the polymer molecules unfold on the oxide surface.…”

Structure and Electrical Properties of Polyelectrolyte Multilayers Formed on Anisometric Colloidal Particles

“…Six layers are formed on β-FeOOH particles by alternated deposition on the particle surface of anionic (PSS) and cationic (PEI) molecules from dilute solutions. The concentrations of NaPSS (4.85 × 10 −5 monoM dm −3 ) and PEI (2.43 × 10 −5 monoM dm −3 ) are high enough to assure strong overcompensation of the surface charge after each deposition step (32,34). The charge reversal allows, in a subsequent adsorption process of oppositely charged polyelectrolyte, for the formation of multilayer films.…”

“…The amount of the polymers added to the suspension is sufficiently high to stabilize it (32,34). The adsorption-centrifugation technique employed for preparation of the multilayer films (including 15-s sonication) has also been used to reduce the possible aggregation in suspension (16).…”

Kinetic study on the sedimentation behavior of Na- and Ca-kaolinite suspension in the presence of polyethyleneimine

“…Polyethyleneimine (PEI) is a cationic polymer and is known to be an excellent cationic flocculant. The adsorption of PEI on SiO 2 , SiC (Pugh and Bergstrom, 1994), Fe 2 O 3 (Radeva and Petkanchin, 1997), ZrO 2 (Wang et al, 1999), bentonite (Alemdar et al, 2005) surfaces were investigated.…”