Protonation of silica particles in the presence of a strong cationic polyelectrolyte (CROSBI ID 245787)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Čakara, Duško ; Kobayashi, Motoyoshi ; Skarba, Michal ; Borkovec, Michal
engleski
Protonation of silica particles in the presence of a strong cationic polyelectrolyte
Potentiometric titrations and electrophoresis techniques were used to study the charging behavior of aqueous silica particle suspensions in the presence of poly(N, N-diallyldimethylammonium chloride) (DADMAC). The main finding is that the particles undergo charge reversal with increasing pH, which can be directly seen by electrophoresis and as a common crossing point in the titration curves at different salt levels. These features resemble the charging behavior of an amphoteric oxide surface. With increasing polymer dose, the charge reversal point shifts towards higher pH. These trends are well reproduced by a modified Stern model. The main effect of the adsorbed cationic polyelectrolyte is to further deprotonate the surface silanol groups, and thereby to induce additional negative charge on the surface.
Adsorption ; Silica ; pDADMAC ; DADMAC ; Surface charge ; Point of zero charge ; PZC
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Podaci o izdanju
339 (1-3)
2009.
20-25
objavljeno
0927-7757
1873-4359
10.1016/j.colsurfa.2009.01.011
Povezanost rada
Kemija, Kemijsko inženjerstvo