Isolated Crystalline Polymers
- In addition to metallic nanostructures, we have also investigated
the melting of isolated polymer single crystals. We are using PE and
depending on growth conditions, one can either grow hexagonal or
diamond shaped crystals.
These crystals are large, up to about 20 µm
in size, but quite thin, about 12 nm.
This graph shows the melting of 5, 1.5, and 0.3ng of PE. This last
curve is about 120 crystals, which is still many. We have done
as few as 3.
Here one can see the HF for a number of different crystals,
down to 3 crystals, or about 5 pg of material.
We hope to soon measure a single crystal. The problem is not the
sensitivity limit of the calorimeter but in making sure that a single
crystal is present.