Hi all
I want to do layer-by-layer on metal NPs using PSS and PDDA as negatively charged and positively charged polyelectrolytes, respectively.
My problem is that at all centrifuge speed, some pellets are formed.
What do you suggest to do this technique with maximum efficiency?
Best Regards,
Mohammad
Probably pellets are formed due to uncontrolled agglomeration - your particles stick together because they have not been fully covered in the previous step by the polymer (so their surface charge is mixed) or there are residues of the polymer from the previous coating step.
I would suggest adding more polymers in each coating step and thorough rinsing of material between coating steps (dispersing in neutral media and centrifuging again, before applying next polymer).
Dear Miha
Thanks for your suggestions.
My problem is that even after adding first round of polymer, after centrifuge, the particles form pellet at any centrifuge speed/time.
BR
Mohammad
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