Abstract
The characteristics of calcium carbonate microparticles formed in supersaturated aqueous solutions, in the presence of some strong/weak anionic polymers or with nonstoichiometric polyelectrolyte complexes with negative charges in excess (NPEC-n), have been investigated under different relative inorganic/polymer ratios, tuned by initial solution supersaturation and polymer concentration. For this purpose two polyanions which contain the carboxylic and sulfonic ionic groups, poly(2-acrylamido-2-methylpropanesulfonic acid-co-acrylic acid) and chondroitin-4-sulfate, were used. NPEC-n dispersions prepared with the same polyanions and chitosan as a polycation were also used as templates for calcium carbonate crystallization. Scanning electron microscopy was used to provide the particle morphologies and flow particle image analysis to evidence their mean sizes and sphericities. The polymer presence in the composite particles was evidenced by X-ray photoelectron spectroscopy, particle charge densities, and zeta p...
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