Abstract
A comprehensive study of the encapsulation of 11 functional dyes belonging to several chemical groups and subgroups is presented. Layer-by-layer polyelectrolyte adsorption at dye crystal surfaces as well as the removal of the crystal core to obtain semipermeable multilayer microcapsules is conducted. Dye crystals are alternately coated by poly(allylamine hydrochloride) (PAH), poly(styrene sulfonate) (PSS), poly(diallyldimethylammonium chloride) (PDADMAC) using a combination of electrostatic, hydrophobic and van der Waals interactions. It is remarkable that the uncharged organic crystals have successfully been coated with PSS without using any amphiphile. The introduction of a water-soluble shell on a functional dye crystal may be of importance in various technologies. We characterized the prepared multilayers at the particle surface or in the microcapsule (shcll) by scanning force microscopy and confocal laser scanning microscopy.
Published Version
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