Adsorption of polyacrylic acid on titanium dioxide

https://doi.org/10.1016/0021-9797(83)90029-2Get rights and content

Abstract

The adsorption isotherms of polyacrylic acid on titanium dioxide (anatase) have been determined in aqueous solutions. The influence of pH, polymer's average molecular weight, and calcium concentration was investigated. Particular attention was paid to the substrate's surface charge and to the polymer's dissociation to explain the adsorption level. Incidence of the polymer adsorption on the solid's particle charge and the dispersion stability was examined. At an alkaline pH, unfavorable electrical forces lead to a low adsorption level where the adsorbed polymer was more likely to lie flat on the surface. Calcium ions gave a bidentate complex with the polymer. The adsorption was enhanced and linearly dependant on the calcium concentration. At intermediate pH adsorption was highly favored by the opposite charges of the surface and the polymer. Evidence was obtained for a flat configuration of the adsorbed molecule at low polymer concentrations, and for a gradual change to a configuration where only a few segments were directly associated with the surface, the rest being in tails or loops protruding in the solution. The solid particles' electrophoretic mobility was closely related to the polyacrylic acid adsorption and to the dispersion stability.

References (19)

  • F.Th Hesselink

    J. Colloid Interface Sci.

    (1977)
  • W Norde et al.

    J. Colloid Interface Sci.

    (1978)
    W Norde et al.

    J. Colloid Interface Sci.

    (1978)
    W Norde et al.

    J. Colloid Interface Sci.

    (1978)
  • M.C Cafe et al.

    J. Colloid Interface Sci.

    (1982)
  • E Killmann

    Croat. Chem. Acta

    (1976)
  • A Foissy et al.

    Colloids Surf.

    (1982)
  • A.R Mathieson et al.

    J. Polym. Sci. A

    (1955)
  • W.P Handrix et al.
  • A Foissy et al.

    J. Dispers. Sci. Technol.

    (1982)
  • I.D Robb et al.

    J. Colloid Interface Sci.

    (1982)
    I.D Robb et al.

    J. Colloid Interface Sci.

    (1982)
There are more references available in the full text version of this article.

Cited by (121)

  • Influence of dispersant functional group architecture on titania pigment particle interactions

    2024, Colloids and Surfaces A: Physicochemical and Engineering Aspects
  • Study on particle dispersion changes over time in aqueous Al<inf>2</inf>O<inf>3</inf> slurries containing ammonium polyacrylate

    2021, Colloids and Surfaces A: Physicochemical and Engineering Aspects
    Citation Excerpt :

    In this mixing operation, polyelectrolytes are often added to disperse particles and control the flow characteristics. The adsorption of the polyelectrolyte on the particle surface increases the surface potential and steric hindrance of the particle, which in turn increases dispersion [4–6]. It is known that the larger the amount of polyelectrolyte adsorbed on the particle surface, the more the dispersion of the particles.

View all citing articles on Scopus
View full text