Colloid and Polymer Science

, Volume 277, Issue 9, pp 846–855 | Cite as

Hydrophilic magnetic polymer latexes. 1. Adsorption of magnetic iron oxide nanoparticles onto various cationic latexes

  • F. Sauzedde
  • A. Elaïssari
  • C. Pichot
ORIGINAL CONTRIBUTION

Abstract

With a view to preparing monosized hydrophilic functional magnetic latex particles based on a two-step strategy using anionic iron oxide and cationic polymer latexes, the adsorption step was systematically investigated for a better control of the subsequent encapsulation step. The iron oxide nanoparticles were first obtained according to the classical precipitation method of ferric and ferrous chloride salt using a concentrated sodium hydroxide solution, whereas the polystyrene (PS), P(S/N-isopropylacrylamide (NIPAM)) core–shell and PNIPAM latexes were produced via emulsion and precipitation polymerizations, respectively. The polymer and inorganic colloids were then characterised. The adsorption of iron oxide nanoparticles onto the three types of polymer latexes via electrostatic interaction was studied as a function of iron oxide particle concentration, charge density and the cross-linking density of the hydrophilic layer. The maximum amounts of magnetic nanoparticles adsorbed onto the various latexes were found to increase in the following order: PS < P(S/NIPAM) < P(NIPAM). This significant difference is discussed by taking into account the charge distribution in the hydrogel layer and diffusion phenomena inside the cross-linked hydrophilic shell.

Key words Cationic latexes Hydrophilic particles Iron oxide Adsorption Electrostatic interactions 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • F. Sauzedde
    • 1
  • A. Elaïssari
    • 1
  • C. Pichot
    • 1
  1. 1.Ecole Normale Superieure de Lyon Unité mixte CNRS-bioMérieux ENS, 46 allée d'Italie F-69364 Lyon, France e-mail: hamid.elaissari@ens-bma.cnrs.fr Tel.: +33-4-7272-8364 Fax: +33-4-7272-8533FR

Personalised recommendations