Studies of Fullerene Aggregates in a Binary Solvent System

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Studies of Fullerene Aggregates in a Binary
Solvent System
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Fullerene
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Goals

• To determine the number of molecules in an
  aggregate and the concentration at which this
  happens.
• To determine the system of interaction between
  the binary solvent and fullerene.

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Part One Fluorescence Investigation
Florescence
Phosphoresce
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Objective

• Determining a fluorescence trend during the
  formation of fullerene aggregates

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Assumptions
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Part II Conductance
6-
6e-
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Objective

• Determine the concentration in which fullerene
  aggregates from a change in conductance.

Aggregation point
L
mole ratio
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Part III Refractive index
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Objective

• To find the amount of pyridine required to
  surround fullerene monomers and aggregates.

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Part III calculations

• From the surface are of aggregate fullerene and
  the estimated area of pyridine, we calculated
  that it would take 12,925 molecules of pyridine
  to surround one aggregate.
• Assuming face centered cubic packing we
  calculated there are 159,000 fullerenes per
  aggregate.

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Part III calculations continued

• Using ratios of surface areas of monomers and
  aggregates and the amount of pyridine surrounding
  each, we calculated that there are 77,331
  fullerenes in an aggregate.
• These calculations were made using hydrodynamic
  radii found in literature.

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Part IV Laser Light Scattering
Beam splitter
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Objective

• To determine the amount of time required for
  fullerene aggregates to form.

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General results

• Fullerene absorbs light in the same region as
  Ru2
• The conductance of fullerene in a binary solvent
  water/pyr does not change as aggregation occurs.
• Different caculations showed 77331 and 159000
  fullerene molecules per aggregate.
• The aggregation process of fullerene takes
  approximately 3.5 seconds when water is added to
  pyridine.

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Acknowledgements
Sam J. Martinus
Dr. Richard C. Ulsh
Dr. Joseph Carney