Ferromagnetic colloids based on metallic cobalt an interesting class of nanoparticles capable of self- assembly via spin dipolar interactions.  We will present an overview of our efforts on the synthesis, functionalization and assembly of polymer coated ferromagnetic cobalt nanoparticles.  A novel synthetic methodology, termed, �Colloidal Polymerization� will also be discussed where ferromagnetic polystyrene coated cobalt nanoparticles were used as �colloidal monomers� to form fused cobalt oxide nanowires.  Using a combination of dipolar assembly and a nanoparticle conversion chemistryt (e.g., oxidation, galvanic exchange), cobalt oxide nanowires with controlled placement of noble metal and semiconductor inclusions has been achieved.  We will discuss our recent efforts to control the sequence, composition and architecture of these dipolar assemblies and the resulting electrochemical properties of the converted cobalt oxide nanocomposites.

Colloidal polymerization of dipolar nanoparticles

243rd National Meeting (2012)

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