Polyelectrolyte multilayer capsule permeability control

Alexei A. Antipov, Gleb B. Sukhorukov, Stefano Leporatti, Igor L. Radtchenko, Edwin Donath, Helmuth Möhwald

Research output: Contribution to journalArticlepeer-review

321 Citations (Scopus)

Abstract

The permeability properties of hollow polyelectrolyte multilayer capsules for different substances were investigated as a function of pH and salt concentration. Capsules were prepared by layer-by-layer (LBL) adsorption of oppositely charged polyelectrolytes onto the surface of melamine formaldehyde and CdCO3 particles followed by core removal. It was shown that the capsules are closed at a pH value of 8 and higher, but at a pH lower than 6 the macromolecules permeate into the capsule interior. For low molecular weight molecules capsules, templated on CdCO3 cores were found to be less permeable than MF-derived capsules. The open and closed states of the capsule wall are reversible. It provides thus an opportunity to encapsulate different materials into polyelectrolyte capsules.

Original languageEnglish
Pages (from-to)535-541
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume198-200
DOIs
Publication statusPublished - 18 Feb 2002
Externally publishedYes

Keywords

  • Encapsulation
  • Multilayers
  • Permeability
  • Polyelectrolyte
  • Release

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