Measuring the Solubility of Ligated Gold Nanoparticles in Hydrocarbon Solvents
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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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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
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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
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Digestive Ripening
Reflux solution of polydisperse particles
Forms monodisperse solution
Post Digestive Ripening
Pre Digestive Ripening
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Alkane Ligated Gold Particle
Au
Au3850(C12SH)350
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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
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Data
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Data
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“Like Dissolves Like”
Thiol chain length influences
solubility
Gold concentration peaks where
solvent similar to ligand
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Data
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Data
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“Like Does Not ALWAYS Dissolve Like”
Peaks not where expected
Unknown forces at work
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Struggles
Separation of two-phase system
Melting point of hexadecane thiol
Stability of particles
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Conclusion
Suspension of particles acting as a
thermal reversible solution
Future Work