Abstract
The effects of particle size on polyacrylamide (PAAm,M w =59×104, 500×104) adsorption were investigated using a series of well-characterized hematite (α-Fe2O3) dispersions. The α-Fe2O3 particles with highly monodisperse and nearly spherical shape ranged in radius from 23 nm to 300 nm. the maximum amount of PAAm adsorption (M m ) in each system, showed a steady increase with decreasing particle radius and was influenced strongly by particle concentrations in the medium. Furthermore, it was realized that the diameter of α-Fe2O3 particles after treatment with PAAm under different particle concentrations decreased with increasing particle concentration. The relation between particle concentration in the medium and particle size after treatment was also influenced by the medium pH, i.e., at the medium pH close to the isoelectric point of α-Fe2O3 particles (pHo=9.2), the particle size after treatment increased with increasing particle concentration. All these results suggest that in the system of ultra-fine particles, the mixing process between particle-particle and polymerparticle will play an important role on the conformation of adsorbed polymer layer.
Similar content being viewed by others
References
Scheutjens JMHM, Fleer GJ (1979) J Phys Chem 83:1619, (1980) J Phys Chem 84:178
Sato T, Ruch R (1980) Stabilization of Colloidal Dispersions by Polymer Adsorption. Marcel Dekker, New York
Napper DH (1983) Polymer Stabilization of Colloid Dispersion. Academic Press, New York
Baker JA, Pearson RA, Berg JC (1989) Langmuir 5:339
Matijevic E, Scheiner P (1978) J Colloid Interface Sci 63:509
Matijevic E, Sapieszko RS, Melville JB (1975) J Colloid Interface Sci 50:567
Penners NHG, Koopal LK (1986) Colloids and Surfaces 19:337
Penners NHG, Koopal LK (1987) Colloids and Surfaces 28:67
Onda N, Furusawa K, Yamaguchi N, Komuro S (1979) J Appl Polym Sci 23:3631
Wiersema PH, Loeb AL, Overbeek JTG (1966) J Colloid Interface Sci 22:78
hesleitner P, Babic D, Kallay N, Matijevic E (1987) Langmuir 3:815
Kobal I, Hesleitner P, Matijevic E (1988) Colloids Surt. 33:167
Furusawa K, Tezuka Y, Watanabe N (1980) J Colloid Interface Sci 73:21
Verwey EJ, Overbeek TTG (1948) Theory of the Stability of Lyophobic Colloids. Elsevier, Amsterdam
Moor WJ (1955) Physical Chemistry, Prentice-Hall, Inc. New York
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Furusawa, K., Shou, Z. & Nagahashi, N. Polymer adsorption on fine particles; the effects of particle size and its stability. Colloid Polym Sci 270, 212–218 (1992). https://doi.org/10.1007/BF00655472
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00655472