Tuesday, 24 May 2005

This presentation is part of: NanoScience and Technology Posters

Molecular Self-Assembly Processes between Vesicles and Nanotubes for Device Fabrications

Ipsita A. Banerjee, Stephanie Colleti, and Rose L. Spear. Fordham University, Bronx, NY

Here we report the study of two new classes of peptide bolamphiphiles containing the bis (N-alpha-amido-His-Glycine-)1,5 pentane dicarboxylate moiety and the bis (N-alpha-amido-Leu-Leucine-)1,5 pentane dicarboxylate moiety. The self-assembly process of the molecules was studied in different solvents as well as at varying pH. It was observed that the His-Gly containing bolamphiphile tends to self-assemble into nanospheres in aqueous solutions within a week. However, in the presence of Ni or Co ions, they tend to fold to form nanotubular structures. Upon reduction, these materials lead to the efficient formation of Ni and Co nanocrystals on the surface of the nanotubes. However the Leu-Leu bolamphile self-assembled to form nanorod like structures in the presence of organic solvents. The nanosphere, nanorod as well as the nanotube formation mechanisms were probed by Raman microscopy. The size and shape of the materials obtained was analyzed by TEM and AFM. Such materials can be used for device fabrications for sensors, electronics and magnetic materials.

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