I need to investigate the dispersion of Al2O3 nanoparticles (60 nm) in a brittle polymeric matrix ( phthalonitrile resin). What is the best way of preparing the samples for the test?.
For brittle nanocomposites, I think you could record TEM images as regular procedures. You can take the image in the cross section to see the presence of nanoparticles. For soft nanocomposites, it is not easy to get clear images. Therefore, some treatments are needed before imaging.
I typically embed the sample in epoxy and ultramicrotome it. If it is too flaky it is best to not ultramicrotome the sample at room temperature. I have tried cutting on a heating stage that softens a sample enough to form uniform films. Best would be to use a FIB to prepare this sample.
Hi Mehdi, best you trim at first your resin and then use an utramicrotome, compare for instance:
http://www.leica-microsystems.com/fileadmin/downloads/Leica%20EM%20TRIM/Brochures/Leica_EMTRIM-Brochure_EN.pdf
http://www.leica-microsystems.com/products/em-sample-prep/biological-specimens/room-temperature-techniques/ultramicrotomy/details/product/leica-em-uc7/
Article A modular programme for the preparation of inhomogeneous mat...
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