Abstract
Polypyrrole colloids are synthesized by an oxidative polymerization of pyrrole by ferric chloride in aqueous media containing a steric stabilizer. Polyvinyl alcohol (125,000 to 186,000 mol. wt., 99% hydrolyzed) was used as the stabilizer to prepare the particles for this study. Depending on the synthesis conditions, polypyrrole colloids typically have diameters between 100 and 200 nm, as evidenced by transmission electron microscopy and disk centrifuge photosedimentometry. The conjugated pyrrole polymer imparts intense black coloration to the colloid. Molecules of biological interest, such as antibodies, can be immobilized in active form on the particle surface. Thus these nanoparticles can be used as colored “markers” for immunodiagnostic assays.
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