Normally, zeta sizer and TEM / SEM will use to analyze the nano particle. My sample is nano iron and proved it is magnetic by VSM analyzing. Due to metal probe, TEM / SEM can not be used for my sample. I found several alternative ways:
1. XRD => Can not analyze liquid sample.
My sample sediments by time. It would be a problem to use method such as freeze drying. Also the temperature and pressure influence magnetic field and magnetic make the particle agglomerate which I think it would affect analyzing the size.
2. DLS => It mainly analyzes distribution and I think I need one more result like TEM / SEM image which the particle size can be seen.
I am not sure if chemicals would affect my sample result and chemistry is not my major. My sample only contains nano iron and di water.
Thank you so much for helping.
If you could make some sort of coating of soft material surrounding the materials, that might help. The coating could decrease the magnetism and thus help to visualize the magnetic materials. Try silica coating if it doesn't affect the material. Also do the sputter coat your sample for 30 seconds before imaging under the microscope. But be careful while using the microscope as the materials could be pulled in by the lens and damage the lens. Please talk to the experts in the microscopy facility in your institution.
Mix Fe NPs in some polymer matrix and droped it on TEM grid/ carbon tape and then observe under TEM or SEM. Otherwise go for AFM.
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