ZnO nanoparticles do not sediment properly in centrifuge?

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The discussion revolves around the centrifugation of a sample at 9000 rpm for 30 minutes, resulting in sediment that detaches when the centrifuge is tilted. Key points include inquiries about the viscosity and type of liquid used in the tube, as well as the nature of the particles, with a caution against the misuse of the term "nanoparticles." The conversation highlights potential electrostatic issues and the importance of the solvent's quality in precipitating nanoparticles. If the particles are too small or if the solvent is not sufficiently poor, precipitation may fail. Loose precipitate suggests the presence of other compounds that may hinder the formation of a tighter pellet, prompting considerations of how these compounds interact with the solvents involved.
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I centrifuged my sample at 9000 rpm for 30 minutes. There is a layer of sediment on the wall but if i tilt the centrifuge it comes off the wall.
 
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For starters:
What is the viscosity of the liquid? And what liquid is in the tube?

... assuming they truly are nanoparticles - because people have been misusing that word a lot.
There can be electrostatic problems for example.

Someone here may know the standard procedure for this separation.
 
can you give me the name of liquid?
 
Are you trying to precipitate your nanoparticles by injecting a poorer solvent? If that's the case, there could be a few reasons why this is not working. If the particles are too small, then even if they are in a poor solvent they may not precipitate. If the solvent is not bad enough, that will also cause this. In my experience, loose precipitate generally means that there is other "stuff" in there that is keeping the particles from forming a tighter pellet. Think about what other compounds there are and how they will interact with the solvent(s).
 

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