Abstract
Novel polyelectrolyte microcapsules are developed using alternating layer-by-layer (LBL) adsorption of oppositely charged polyelectrolytes onto charged templates followed by core removal. These capsules have a continuous wall with a hollow interior and exhibit tunable permeability, which can be utilized for both sustained release from the capsule and precipitation reactions from the bulk to the capsule interior. The purpose of this work is to understand core removal mechanism and elucidate the structure−property relationships governing capsule stability and yield, integrity, and mesh size. To this end, melamine formaldehyde (MF) templates with polyelectrolyte multilayers (PEMs) of poly(styrene sulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) were investigated by confocal Raman microscopy, surface force microscopy, and confocal laser scanning microscopy. The capsule structure is dominated by two critical factors: the wall thickness and the core decomposition condition. After optimization of the c...
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