Incorporation of macromolecules into polyelectrolyte micro- and nanocapsules via surface controlled precipitation on colloidal particles

Igor L. Radtchenko, Gleb B. Sukhorukov, Helmuth Möhwald

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)

Abstract

A novel approach to incorporate different polymers into micro- and nanocapsules fabricated by means of layer-by-layer (LbL) adsorption of oppositely charged polyelectrolytes on colloidal particles is proposed. This method comprises two stages. At first, the polymers, which are supposed to be incorporated, precipitate on the surface of colloidal particles. This can be done either by complexation of polyelectrolytes with multivalent ions or by adding miscible non-solvents. Then stable LbL assembled polyelectrolyte shells are formed. After core decomposition the inner polymer molecules are released from the wall but captured by the outer shell and floating in the capsule interior. The possibilities to encapsulate a wide class of charged and non-charged polymers were demonstrated on such examples as sodium poly(styrene sulfonate) as a polyanion, poly(allylamine hydrochloride) as a polycation and Dextrane as non-charged water soluble polymer.

Original languageEnglish
Pages (from-to)127-133
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume202
Issue number2-3
DOIs
Publication statusPublished - 9 Apr 2002
Externally publishedYes

Keywords

  • Coated colloids
  • Encapsulation
  • Layer-by-layer
  • Multilayer
  • Polyelectrolyte

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