Measuring the Solubility of Ligated Gold Nanoparticles in Hydrocarbon Solvents By Jeffrey Powell Physics REU Summer 2009 Partially Funded Through NSF.

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Presentation transcript:

Measuring the Solubility of Ligated Gold Nanoparticles in Hydrocarbon Solvents By Jeffrey Powell Physics REU Summer 2009 Partially Funded Through NSF

Nanotechnology Reside at the edge of quantum mechanics and condensed matter Can act and behave as a supermolecule Large ratio of surface area to volume Tip of the Iceberg

Synthesis of Gold Nanoparticles Inverse Micelle Method-Soaps and Salts Reduction of Gold Salt to grow nanocrystals Ligands added to stabilize Micellar Diffusion structures nanocrystals

Digestive Ripening Reflux solution of polydisperse particles Forms monodisperse solution Post Digestive Ripening Pre Digestive Ripening

Alkane Ligated Gold Particle Au Au 3850 (C 12 SH) 350

Solubility Tests Dissolved in alkane solvents Centrifuge at 12000g acceleration Take UV-Vis absorbance data on the supernatant Raw data converted into concentration of gold in solution

Data

Like Dissolves Like Thiol chain length influences solubility Gold concentration peaks where solvent similar to ligand

Data

Like Does Not ALWAYS Dissolve Like Peaks not where expected Unknown forces at work

Struggles Separation of two-phase system Melting point of hexadecane thiol Stability of particles

Conclusion Suspension of particles acting as a thermal reversible solution Future Work