COLL 361 |
| Fotios Papadimitrakopoulos1, Debjit Chattopadhyay2, and Izabela Galeska2. (1) Nanomaterials Optoelectronics Laboratory, Department of Chemistry, Polymer Program, Institute of Materials Science, University of Connecticut, 97 North Eaglville Rd, U-3136, Storrs, CT 06269, (2) Institute of Materials Science, University of Connecticut, 97 North Eagleville Rd, U-136, Storrs, CT 06269 |
| The adsorption characteristics of rigid (shortened Single Wall Carbon Nanotubes (s-SWNTs)) and flexible polyions (i.e. Nafion™ or Humic acids) on a variety of metallorganic substrates will be discussed. In the case of s-SWNTs, when assembled onto rigid metallorganic substrates (i.e. Fe(OH)x), dense arrays aligned normal to substrates have been obtained. This geometry is believed to be the result of (i) high concentration of acidic carboxy groups on the severed edges of s-SWNTs and basic Fe(OH)x substrate and (ii) strong hydrophobic interactions between adjacent s-SWNTs. This is further substantiated by the relatively high densities observed for these assemblies, approaching that of SWNT rope lattice. In contrast to such unusual growth characteristics of the rigid s-SWNT polyanions, soft polymeric polyanion like Nafion or Humic Acids exhibit a more porous structure. This has been exploited in the fabrication of semi-permeable, calcification resistant membranes, suitable for a variety of biosensor applications (i.e. glucose sensors). |
|
Adsorption of Macromolecules at Liquid-Solid Interfaces
Division of Colloid and Surface Chemistry |