Layer-by-layer formation of polyamine-salt aggregate/polyelectrolyte multilayers.Loading and controlled release of probe molecules from self-assembled supramolecular networks

HERRERA, SANTIAGO E.; AGAZZI, MAXIMILIANO L.; M. LORENA CORTEZ; WALDEMAR A. MARMISOLLÉ; VON BILDERLING, CATALINA; AZZARONI, OMAR

MACROMOLECULAR CHEMISTRY AND PHYSICS

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2019 vol. 1900 p. 1 - 10

1022-1352

The use of soft materials as building blocks in layer by layer assemblies is an interesting approach to enhance the loading capacity of thin films. Here we explore the capacity of positively charged colloids based on ionically crosslinked poly (allylamine hydrochloride) (PAH) with phosphate anions (Pi) to act as building blocks in construction of multilayers by alternated deposition with poly (sodium styrene sulfonate) (PSS). Hybrid thin films were successfully prepared by the LbL technique with a highly regular growth and a material deposition rate higher than the traditional full polyelectrolyte LbL. The loading of bromophenol blue (BPB) was evaluated by integration into the ionically crosslinked PAH/Pi colloids followed by LbL deposition and monitored with UV-Vis spectroscopy. Finally, the release of the dye molecules was carried out by exposing the film to different aqueous solutions. We show that a fully controlled release can be achieved by simply varying the media pH obtaining total BPB release over periods between minutes and months. The data obtained reveals that this new LbL construction strategy using ionically crosslinked PAH/Pi colloids allows to obtain nanoarchitectures with high loading capacity and interesting properties for controlled release.