Preparation parameter development for layer-by-layer assembly of keggin-type polyoxometalates

COLL 463

Ritesh N. Vyas, riteshnvyas@gmail.com1, Shafi Shaik2, and Bin Wang, bin.wang@lamar.edu1. (1) Department of Chemical Engineering, Lamar University, 4400 MLK blvd, P.O. Box 10053, Beaumont, TX 77710, (2) Department of Chemistry, Lamar University, 4400 MLK blvd, P.O. Box 10053, Beaumont, TX 77710
Polyoxometalates possess many useful properties for electrochemical catalysis. These molecule-size clusters can be assembled into thin films through the layer-by-layer method. In this study, we determined a cluster concentration range within which layer-by-layer (LbL) films have been successfully fabricated. We also find the influence of salt added to the deposition solutions. In an attempt to understand the self-assembly process at the molecular level, thermodynamic arguments, derived from complexation between nanoscale particles and oppositely charged polyelectrolyte chains, have been employed to interpret the adsorption of polyoxometalate clusters onto a cationic polymer layer. The scaling results describe the contact mode between a polymer chain and a cluster. The assembly can be visualized with assistance by understanding the contact between the polymer chain and the cluster.
 

Polymer-Nanoparticle Systems: Theory, Simulation, Experiments
9:00 AM-11:40 AM, Thursday, April 10, 2008 Morial Convention Center -- Rm. 227, Oral

Division of Colloid & Surface Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008