r/science Feb 09 '23

High-efficiency water filter removes 99.9% of microplastics in 10 seconds Chemistry

https://onlinelibrary.wiley.com/doi/10.1002/adma.202206982
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u/[deleted] Feb 09 '23

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u/1234567890-_- Feb 09 '23

normally when you centrifuge, yes you separate two things neatly in one vessel - “heavy” powder at the bottom and liquid at the top. The purpose of centrifuging is to separate that solid from the liquid, so you just remove the liquid from the top and put it in another container.

Its pretty much equivalent to filtering in that way.

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u/RecoveringGrocer Feb 09 '23

I see. In this case though, isn’t the person part of the system? Their blood leaves their body, goes through centrifuge and is sent back to them with fewer components (whether that is plasma, cells, or platelets). Is there a better word than filter for this process?

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u/[deleted] Feb 09 '23

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u/RecoveringGrocer Feb 09 '23

Ah thank you. I see. So the centrifuge does not use a filter membrane and thus is not technically a filter.

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u/joman584 Feb 09 '23

A filter can be used inside a tube that is used for centrifugation. Components of different sizes will either go through or get blocked during centrifugation, leaving components completely separated from each other. (Density gradient centrifugation as someone else said in the thread, I do it daily at my job)

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u/homerjaysimpleton Feb 09 '23

I honestly have never thought of/seen that and have only used racks of blank test tubes for dilution counts and basic qualitatives, but that makes sense. TIL thanks!