Dispersion of alumina-coated TiO2 slurries in the presence of poly(acrylic) acid influence of monovalent counterions

摘要: The rheological behavior of concentrated alumina-coated TiO2 slurries has been investigated in connection with the type surface counterions (monovalent cations: X = Li+, Na+, TMA+) absence and presence polyacrylic acid (PAA). study conducted a pH range 4-10 ionic strengths lower than 0.01 M. strength were adjusted XOH XCl, respectively. properties have by titration apparent yield stress measured using dynamic rheometer. It appears from results that at maximum magnitude depend on nature counterion. measurements also PAA (0.5 segment/nm2) adsorbed particle surface. In case, mineral polymer neutralized XOH. show dispersion efficiency depends general, it is found corresponding counterion density both follow sequence TMA+ < Na+ Li+. adsorption apparently amplifies effects observed cation. An electrostriction effect hydration layer interface suggested order to explain increasing as Li+ increases. so-called structure-making/structure-breaking model explains reduction density.