Hello Tran,

It will be easy to add exact idea/ans for separation; if you give more info about the @constituents in solutions, thikness of tube, length etc.

Anyway, just centrifuge it @6000-7000rpm for 30 minutes (in 3 steps. Time interval 10) and then remove the filtrate. It might work...

Later you can also use PTFE along with....

Santosh K. Tiwari Hi Santosh,

Thank you for your suggestion! I am also thinking to use centrifuge in this case. I just don't know which rpm to use, and the time interval.

Basically, I am doing an adsorption experiment with MWCNT, so I need to make sure the CNT is completely removed from my solution before the analysis. If not, I am afraid that the adsorption process still can happen until the sample is injected into the instrument for analysis.

Here is the dimension of my MWCNTs (regular tubular structures of outer diameter in the range of 30–50 nm and length reported by the manufacturer to be 5–15 µm). My sample also contained iron nano-particles of 3nm.

This process is usually a problem. personally, if what you want to separate is dissolved, I recommend separation by centrifugation. It is much more effective and much less material is lost.