| Abstract
| - Highly stable, isolated, and monodisperse Ag nanoparticles, protected by poly(amidoamine) (PAMAM)dendrimers, were prepared via direct chemical reduction. UV−visible absorption, dynamic light scattering,and transmission electron microscopy have been used to study the structure and behavior of the nanocompositesas a function of pH. The data show that pH is a critical determinant of aggregation in PAMAM dendrimers,and that dendrimer aggregation, in turn, strongly influences nanoparticle stability against flocculation. Theresults allow for a complete understanding of previously reported difficulties in preparing Ag nanoparticlesby this method.
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