Hi, I can think of two different ways to do that.
i) Impregnate your sample with an epoxy resin, and cut it with a microtome into slices about 60 nm thick;
ii) Crush your sample into a powder, disperse it in ethanol, let it rest for a few minutes and put a drop of the supernatant on the microscopy grid.
If you want, have a look at
Journal of Microscopy, 226 (2007) 156-162.
where both techniques are used.
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