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76 . MultiScope System Microscope User's Reference
Polymers
Diamond anvil cell
Polymer samples such as paint chips, thick films, elastomers, or fibers can be
pressed or squeezed to reduce their pathlength.
A convenient device for pressing polymers (or other compressible samples) is the
miniature diamond anvil cell, shown in Figure 15. It enables you to both thin the
sample and collect its spectrum in the same device, an advantage when you have
limited material available.
It is small enough to be easy to manipulate, and fits in the recessed retainer in the
support for large samples. By collecting a background spectrum of an empty area of
the cell, you can completely compensate for the absorption bands of the diamonds.
To thin a sample in the miniature diamond anvil cell:
1. Loosen and remove the three screws that hold the cell together.
2. Lift off the top half of the cell and set it aside.
3. Place the sample on the bottom half of the cell. (The sample must be small.)
4. Put the top half back on the cell, lining up the red dots on the top and bottom
halves.
Do not tighten the screws yet; applying uneven sheer forces may damage the
diamonds.
5. Press down on the cell with your thumb to thin the sample. Replace the three
screws and tighten them finger tight.
NOTE: If the spectrum collected with the diamond anvil cell shows interference
fringes, place some KBr in the cell and collect a background spectrum
through it.
CAUTION
One diamond can damage another.