As of now, I'm cutting my samples before lyophilising and after that sputtering is done for FESEM analysis.
I've no experience, but here is a collection of references from my notes:
https://www.intechopen.com/books/progress-in-molecular-and-environmental-bioengineering-from-analysis-and-modeling-to-technology-applications/hydrogels-methods-of-preparation-characterisation-and-applications
https://cdn.intechopen.com/pdfs-wm/17237.pdf
Syed K. H. Gulrez, Saphwan Al-Assaf
Chapter 5
Hydrogels: Methods of Preparation, Characterisation and Applications
DOI: 10.5772/24553
in:
"Progress in Molecular and Environmental Bioengineering - From Analysis and Modeling to Technology Applications",
book edited by Angelo Carpi, ISBN 978-953-307-268-5, Published: August 1, 2011 under CC BY-NC-SA 3.0 license. © The Author(s).
https://www.researchgate.net/post/how_to_take_SEM_for_an_gel_sample
Is it possible to freeze-dry a hydrogel, and use TEM or SEM to see the structure?
https://www.researchgate.net/post/Is_it_possible_to_freeze-dry_a_hydrogel_and_use_TEM_or_SEM_to_see_the_structure
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