If I centrifuge some polymeric nanoparticles at 6000 rpm, there's some precipitation. Is this because some polymer didn't form nanoparticles???
But.. I read that to precipitaed NANOPARTICLES it's necessary to do ULTRACENTRIFUGATION, probably, those are some MICROPARTICLES I guess...
please what ever i got your question tried to answer it please if i m wrong correct me .............."best way do ULTRASONICATION at high power rating because of its all agglomartes are braked........but we want dispersion then you need centrifuge ....6000 rpm are so more which causes the breakge of partical ultimate you dont get good dispersion of filler in matrix ...upto 1000 rpm enough "
Hi! In my experience with the centrifuge of cellulose nanofibers (and i don't know if this can be translated to your nanoparticles) what could had happen is a) that you have used too much speed b) the nanoparticles have been "stticked" each other making bigger agregates c) your suspension had very high concentration of nanoparticles (which in my special case made all of the nanofibers precipitating)
I solved this issue just trying different speeds of centrifugation and after characterizing the supernatant (the liquid) and the precipitate and finding an optimal value
Tatiana,
you have to start with Stokes law. 6000 rpm can mean a lot of different depending on centrifuge construction (distance to the centre of rotation), you have to calculate the centrifugal acceleration.
Sedimentation velocity obviously depends on the degree of agglomeration. Analytical centrifugation can tell you a lot about your nanoparticle dispersions.
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